diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fbb74b5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,25 @@
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+.vs/
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Mine
+Tmp/
+/packages/
diff --git a/RevokeMsgPatcher.sln b/RevokeMsgPatcher.sln
new file mode 100644
index 0000000..e632b93
--- /dev/null
+++ b/RevokeMsgPatcher.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28010.2016
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RevokeMsgPatcher", "RevokeMsgPatcher\RevokeMsgPatcher.csproj", "{977BF781-CED8-4389-9404-0FA08FDF21DF}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{977BF781-CED8-4389-9404-0FA08FDF21DF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{977BF781-CED8-4389-9404-0FA08FDF21DF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{977BF781-CED8-4389-9404-0FA08FDF21DF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{977BF781-CED8-4389-9404-0FA08FDF21DF}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {56DAEA8C-77F7-4E55-A7AF-CE9F23F2C1A6}
+	EndGlobalSection
+EndGlobal
diff --git a/RevokeMsgPatcher/App.config b/RevokeMsgPatcher/App.config
new file mode 100644
index 0000000..8e15646
--- /dev/null
+++ b/RevokeMsgPatcher/App.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
+    </startup>
+</configuration>
\ No newline at end of file
diff --git a/RevokeMsgPatcher/FormMain.Designer.cs b/RevokeMsgPatcher/FormMain.Designer.cs
new file mode 100644
index 0000000..31898f6
--- /dev/null
+++ b/RevokeMsgPatcher/FormMain.Designer.cs
@@ -0,0 +1,142 @@
+namespace RevokeMsgPatcher
+{
+    partial class FormMain
+    {
+        /// <summary>
+        /// 必需的设计器变量。
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// 清理所有正在使用的资源。
+        /// </summary>
+        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows 窗体设计器生成的代码
+
+        /// <summary>
+        /// 设计器支持所需的方法 - 不要修改
+        /// 使用代码编辑器修改此方法的内容。
+        /// </summary>
+        private void InitializeComponent()
+        {
+            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(FormMain));
+            this.label2 = new System.Windows.Forms.Label();
+            this.btnPatch = new System.Windows.Forms.Button();
+            this.txtPath = new System.Windows.Forms.TextBox();
+            this.btnChoosePath = new System.Windows.Forms.Button();
+            this.label1 = new System.Windows.Forms.Label();
+            this.linkLabel1 = new System.Windows.Forms.LinkLabel();
+            this.btnRestore = new System.Windows.Forms.Button();
+            this.SuspendLayout();
+            // 
+            // label2
+            // 
+            this.label2.AutoSize = true;
+            this.label2.Location = new System.Drawing.Point(17, 15);
+            this.label2.Name = "label2";
+            this.label2.Size = new System.Drawing.Size(65, 12);
+            this.label2.TabIndex = 1;
+            this.label2.Text = "微信路径：";
+            // 
+            // btnPatch
+            // 
+            this.btnPatch.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
+            this.btnPatch.Location = new System.Drawing.Point(409, 10);
+            this.btnPatch.Name = "btnPatch";
+            this.btnPatch.Size = new System.Drawing.Size(102, 23);
+            this.btnPatch.TabIndex = 3;
+            this.btnPatch.Text = "点我防撤回！";
+            this.btnPatch.UseVisualStyleBackColor = true;
+            this.btnPatch.Click += new System.EventHandler(this.btnPatch_Click);
+            // 
+            // txtPath
+            // 
+            this.txtPath.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
+            this.txtPath.Location = new System.Drawing.Point(88, 12);
+            this.txtPath.Name = "txtPath";
+            this.txtPath.Size = new System.Drawing.Size(275, 21);
+            this.txtPath.TabIndex = 4;
+            // 
+            // btnChoosePath
+            // 
+            this.btnChoosePath.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
+            this.btnChoosePath.Location = new System.Drawing.Point(369, 10);
+            this.btnChoosePath.Name = "btnChoosePath";
+            this.btnChoosePath.Size = new System.Drawing.Size(34, 23);
+            this.btnChoosePath.TabIndex = 5;
+            this.btnChoosePath.Text = "...";
+            this.btnChoosePath.UseVisualStyleBackColor = true;
+            this.btnChoosePath.Click += new System.EventHandler(this.btnChoosePath_Click);
+            // 
+            // label1
+            // 
+            this.label1.AutoSize = true;
+            this.label1.Location = new System.Drawing.Point(17, 44);
+            this.label1.Name = "label1";
+            this.label1.Size = new System.Drawing.Size(101, 12);
+            this.label1.TabIndex = 6;
+            this.label1.Text = "软件主页(开源)：";
+            // 
+            // linkLabel1
+            // 
+            this.linkLabel1.AutoSize = true;
+            this.linkLabel1.Location = new System.Drawing.Point(112, 44);
+            this.linkLabel1.Name = "linkLabel1";
+            this.linkLabel1.Size = new System.Drawing.Size(41, 12);
+            this.linkLabel1.TabIndex = 7;
+            this.linkLabel1.TabStop = true;
+            this.linkLabel1.Text = "GitHub";
+            // 
+            // btnRestore
+            // 
+            this.btnRestore.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
+            this.btnRestore.Location = new System.Drawing.Point(409, 39);
+            this.btnRestore.Name = "btnRestore";
+            this.btnRestore.Size = new System.Drawing.Size(102, 23);
+            this.btnRestore.TabIndex = 8;
+            this.btnRestore.Text = "备份还原";
+            this.btnRestore.UseVisualStyleBackColor = true;
+            this.btnRestore.Click += new System.EventHandler(this.btnRestore_Click);
+            // 
+            // FormMain
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.ClientSize = new System.Drawing.Size(523, 69);
+            this.Controls.Add(this.btnRestore);
+            this.Controls.Add(this.linkLabel1);
+            this.Controls.Add(this.label1);
+            this.Controls.Add(this.btnChoosePath);
+            this.Controls.Add(this.txtPath);
+            this.Controls.Add(this.btnPatch);
+            this.Controls.Add(this.label2);
+            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
+            this.Name = "FormMain";
+            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
+            this.Text = "微信防撤回补丁";
+            this.ResumeLayout(false);
+            this.PerformLayout();
+
+        }
+
+        #endregion
+        private System.Windows.Forms.Label label2;
+        private System.Windows.Forms.Button btnPatch;
+        private System.Windows.Forms.TextBox txtPath;
+        private System.Windows.Forms.Button btnChoosePath;
+        private System.Windows.Forms.Label label1;
+        private System.Windows.Forms.LinkLabel linkLabel1;
+        private System.Windows.Forms.Button btnRestore;
+    }
+}
+
diff --git a/RevokeMsgPatcher/FormMain.cs b/RevokeMsgPatcher/FormMain.cs
new file mode 100644
index 0000000..2d04d36
--- /dev/null
+++ b/RevokeMsgPatcher/FormMain.cs
@@ -0,0 +1,117 @@
+using System;
+using System.IO;
+using System.Windows.Forms;
+
+namespace RevokeMsgPatcher
+{
+    public partial class FormMain : Form
+    {
+        Patcher patcher = null;
+
+        public FormMain()
+        {
+            InitializeComponent();
+            patcher = new Patcher();
+            txtPath.Text = Util.AutoFindInstallPath();
+            if (!string.IsNullOrEmpty(txtPath.Text))
+            {
+                patcher.IntallPath = txtPath.Text;
+                btnRestore.Enabled = File.Exists(patcher.BakPath);
+            }
+        }
+
+        private void btnPatch_Click(object sender, EventArgs e)
+        {
+            if (string.IsNullOrEmpty(txtPath.Text) || !Util.IsWechatInstallPath(txtPath.Text))
+            {
+                MessageBox.Show("请选择微信安装路径!");
+                return;
+            }
+            patcher.IntallPath = txtPath.Text;
+
+            try
+            {
+                btnPatch.Enabled = false;
+                string version = patcher.JudgeVersion();
+                if (!string.IsNullOrEmpty(version))
+                {
+                    if (version == "done")
+                    {
+                        MessageBox.Show("已经安装过防撤回补丁了");
+                        btnPatch.Enabled = true;
+                        return;
+                    }
+
+                    if (patcher.Patch())
+                    {
+                        MessageBox.Show("成功安装防撤回补丁！原 WeChatWin.dll 文件已经备份到 " + patcher.BakPath + " ，如果有问题可以手动覆盖恢复");
+                    }
+                    else
+                    {
+                        MessageBox.Show("防撤回补丁安装失败！");
+                    }
+                    btnRestore.Enabled = File.Exists(patcher.BakPath);
+                }
+                else
+                {
+                    MessageBox.Show("当前微信版本不被支持：" + Util.GetFileVersion(patcher.DllPath));
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+                MessageBox.Show(ex.Message);
+            }
+            btnPatch.Enabled = true;
+        }
+
+        private void txtPath_TextChanged(object sender, EventArgs e)
+        {
+            if (!string.IsNullOrEmpty(txtPath.Text))
+            {
+                patcher.IntallPath = txtPath.Text;
+                btnRestore.Enabled = File.Exists(patcher.BakPath);
+            }
+        }
+
+        private void btnChoosePath_Click(object sender, EventArgs e)
+        {
+            FolderBrowserDialog dialog = new FolderBrowserDialog();
+            dialog.Description = "请选择微信安装路径";
+            if (dialog.ShowDialog() == DialogResult.OK)
+            {
+                if (string.IsNullOrEmpty(dialog.SelectedPath) || !Util.IsWechatInstallPath(dialog.SelectedPath))
+                {
+                    MessageBox.Show("无法找到微信关键文件，请选择正确的微信安装路径!");
+                }
+                else
+                {
+                    txtPath.Text = dialog.SelectedPath;
+                }
+            }
+        }
+
+        private void btnRestore_Click(object sender, EventArgs e)
+        {
+            btnRestore.Enabled = false;
+            try
+            {
+                if (File.Exists(patcher.BakPath))
+                {
+                    File.Copy(patcher.BakPath, patcher.DllPath, true);
+                    MessageBox.Show("还原成功");
+                }
+                else
+                {
+                    MessageBox.Show("备份文件不存在");
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+                MessageBox.Show(ex.Message);
+            }
+            btnRestore.Enabled = File.Exists(patcher.BakPath);
+        }
+    }
+}
diff --git a/RevokeMsgPatcher/FormMain.resx b/RevokeMsgPatcher/FormMain.resx
new file mode 100644
index 0000000..97c6724
--- /dev/null
+++ b/RevokeMsgPatcher/FormMain.resx
@@ -0,0 +1,197 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <assembly alias="System.Drawing" name="System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
+  <data name="$this.Icon" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+    <value>
+        AAABAAEAICAAAAEAIACoEAAAFgAAACgAAAAgAAAAQAAAAAEAIAAAAAAAABAAAAAAAAAAAAAAAAAAAAAA
+        AADn7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
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+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5u3y/6Omqf/N1Nb/sbW4/83R1v/m7fH/5+3y/+ft
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+        8v/n7fH/5u3x/9DV2f+nqq3/0tbb/+bt8v/M0db/kZWY/7zAxP/h5+z/5+3y/+fs8v/m7PL/0Nbb/6mt
+        sP/W2+D/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3x/7a5vf+7se3/0M7w/7a7
+        vv/n7PH/5+3y/+ft8v/n7fL/5u3y/+ft8f+9wMT/qq6x/+Lo7P/g5+z/vcLG/2FkZv/S19z/4efr/+ft
+        8v/m7fL/6Ozy/7q+wf+zt7r/5uzx/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/m7fH/trm9/+fs
+        8f/n7fL/uL2//+ft8f/n7fL/6Ozy/+Xr8v+2u7//s7e6/+br8f/k6e7/q6+y/7i9wP/m7fH/4Obq/5OW
+        mf+nq6//3ePn/+bs8f/n7fL/5+3y/9zi5/+prrH/p6uu/+Hl6f/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/Gys//2t/j/+bt8v+4vcD/5evw/+bs8f+5vcH/rbK1/97k6v/T2Nz/pqms/+Dl6v/m7fL/1tve/6er
+        rv/N0tb/5+3y/+ft8v+kqKz/4+nu/97k6P/m7PL/5+3y/9LX2/+5vcH/o6ap/+fs8//n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8f+xtbj/trq8/7e8v//Axcn/rbK1/9vh5f/n7fL/5u3x/8LGyv/m7PH/qa2v/9je
+        4v/n7PL/6Ozx/8DFyP+qrrH/5Orv/+bs8v/Q1dr/zNHW/83T1/+tsLP/s7e5/6yvsv/Z3+P/6Ozy/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+fs8f/Y3eH/rK+z/9PX3P/n7fL/5+3y/+ft8v/m7fH/wMXI/+bs
+        8v/m7PL/sLW3/9LY2//m7fH/6Ozy/+Ho7P+orK//xcrN/+Po7f+1ubz/rLCy/6+ytf/P1Nj/5+3x/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/7a6vv/n7PH/5+3y/+ft8v/n7fL/5+3y/+ft
+        8f/Cx8r/5uzx/+ft8v/m7PL/q6+y/+bs8v/n7fL/5+3y/+bt8v/JztL/oaSn/6irrv/Hy8//5+3x/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/2+Hm/7y/wv/n7fL/5+3y/+jt
+        8f/m7PD/ztTY/9Xa3v/m7fL/5+3y/+fs8f+wtbf/5uzy/+ft8v/n7fL/5+3y/+fs8v/m7PH/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/sba4/+Xq
+        7//Z3uL/sbW4/7C0uP/X29//4ujs/8DEx//m7PH/4ufr/7W5vP/n7fH/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/k6e3/rbCz/7G1t/+1ubv/oKKl/+Xq7//n7PL/4+jt/7S4uv+tsbT/5evv/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/P1Nj/k5aY/7zBxP/m7PL/5+zz/+Tp7f+yt7r/r7O2/8jN0f/n7fH/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+bt8v/h5+v/rLCz/7q/wv+vsrb/rrO2/+Ln7P/m7fL/5u3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/29/k/+Xq7//m7PP/5u3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+bt8v/m7PL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5u3y/+bt
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft8v/n7fL/5+3y/+ft
+        8v/n7fL/5+3y/+ft8v/n7fL/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+        AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+        AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
+</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/RevokeMsgPatcher/Model/TargetFile.cs b/RevokeMsgPatcher/Model/TargetFile.cs
new file mode 100644
index 0000000..f4c8819
--- /dev/null
+++ b/RevokeMsgPatcher/Model/TargetFile.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RevokeMsgPatcher.Model
+{
+    public class TargetFile
+    {
+        public string FileName { get; set; }
+
+        public string Version { get; set; }
+
+        public string SHA1Before { get; set; }
+
+        public string SHA1After { get; set; }
+
+        public long Position { get; set; }
+
+        public byte Content { get; set; }
+    }
+}
diff --git a/RevokeMsgPatcher/Patcher.cs b/RevokeMsgPatcher/Patcher.cs
new file mode 100644
index 0000000..5154494
--- /dev/null
+++ b/RevokeMsgPatcher/Patcher.cs
@@ -0,0 +1,86 @@
+using RevokeMsgPatcher.Model;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Web.Script.Serialization;
+
+namespace RevokeMsgPatcher
+{
+    public class Patcher
+    {
+
+        private string intallPath;
+        public string IntallPath
+        {
+            get { return intallPath; }
+            set
+            {
+                intallPath = value;
+                if (!string.IsNullOrEmpty(intallPath) && Util.IsWechatInstallPath(intallPath))
+                {
+                    dllPath = Path.Combine(intallPath, "WeChatWin.dll");
+                    bakPath = Path.Combine(intallPath, "WeChatWin.dll.h.bak");
+                }
+                else
+                {
+                    intallPath = null;
+                    dllPath = null;
+                    bakPath = null;
+                }
+            }
+        }
+
+        private string dllPath;
+        private string bakPath;
+
+        public string DllPath { get => dllPath; }
+        public string BakPath { get => bakPath; }
+
+        private List<TargetFile> targetFiles;
+        private TargetFile currentFile;
+
+        public Patcher()
+        {
+            JavaScriptSerializer serializer = new JavaScriptSerializer();
+            targetFiles = serializer.Deserialize<List<TargetFile>>(Properties.Resources.PatchJson);
+        }
+
+        public string JudgeVersion()
+        {
+            string sha1 = Util.ComputeFileSHA1(dllPath);
+            Debug.WriteLine(sha1);
+
+            foreach (TargetFile t in targetFiles)
+            {
+                if (sha1 == t.SHA1After)
+                {
+                    return "done";
+                }
+                if (sha1 == t.SHA1Before)
+                {
+                    currentFile = t;
+                    return t.Version;
+                }
+            }
+
+            return null;
+        }
+
+        public bool Patch()
+        {
+            if (currentFile != null)
+            {
+                File.Copy(dllPath, bakPath, true);
+                bool done = Util.EditHex(dllPath, currentFile.Position, currentFile.Content);
+                if (!done)
+                {
+                    File.Copy(bakPath, dllPath, true);
+                }
+                return done;
+            }
+            return false;
+        }
+
+    }
+}
diff --git a/RevokeMsgPatcher/Program.cs b/RevokeMsgPatcher/Program.cs
new file mode 100644
index 0000000..6141c46
--- /dev/null
+++ b/RevokeMsgPatcher/Program.cs
@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace RevokeMsgPatcher
+{
+    static class Program
+    {
+        /// <summary>
+        /// 应用程序的主入口点。
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new FormMain());
+        }
+    }
+}
diff --git a/RevokeMsgPatcher/Properties/AssemblyInfo.cs b/RevokeMsgPatcher/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..c5bf89b
--- /dev/null
+++ b/RevokeMsgPatcher/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// 有关程序集的一般信息由以下
+// 控制。更改这些特性值可修改
+// 与程序集关联的信息。
+[assembly: AssemblyTitle("RevokeMsgPatcher")]
+[assembly: AssemblyDescription("微信防撤回补丁")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("huiyadanli")]
+[assembly: AssemblyProduct("RevokeMsgPatcher")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// 将 ComVisible 设置为 false 会使此程序集中的类型
+//对 COM 组件不可见。如果需要从 COM 访问此程序集中的类型
+//请将此类型的 ComVisible 特性设置为 true。
+[assembly: ComVisible(false)]
+
+// 如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
+[assembly: Guid("977bf781-ced8-4389-9404-0fa08fdf21df")]
+
+// 程序集的版本信息由下列四个值组成: 
+//
+//      主版本
+//      次版本
+//      生成号
+//      修订号
+//
+// 可以指定所有值，也可以使用以下所示的 "*" 预置版本号和修订号
+// 方法是按如下所示使用“*”: :
+//[assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/RevokeMsgPatcher/Properties/Resources.Designer.cs b/RevokeMsgPatcher/Properties/Resources.Designer.cs
new file mode 100644
index 0000000..4b62cbf
--- /dev/null
+++ b/RevokeMsgPatcher/Properties/Resources.Designer.cs
@@ -0,0 +1,72 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     此代码由工具生成。
+//     运行时版本:4.0.30319.42000
+//
+//     对此文件的更改可能会导致不正确的行为，并且如果
+//     重新生成代码，这些更改将会丢失。
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace RevokeMsgPatcher.Properties {
+    using System;
+    
+    
+    /// <summary>
+    ///   一个强类型的资源类，用于查找本地化的字符串等。
+    /// </summary>
+    // 此类是由 StronglyTypedResourceBuilder
+    // 类通过类似于 ResGen 或 Visual Studio 的工具自动生成的。
+    // 若要添加或移除成员，请编辑 .ResX 文件，然后重新运行 ResGen
+    // (以 /str 作为命令选项)，或重新生成 VS 项目。
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "15.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   返回此类使用的缓存的 ResourceManager 实例。
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("RevokeMsgPatcher.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   重写当前线程的 CurrentUICulture 属性
+        ///   重写当前线程的 CurrentUICulture 属性。
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   查找类似 [{&quot;FileName&quot;:&quot;WeChatWin.dll&quot;,&quot;Version&quot;:&quot;2.6.8.52&quot;,&quot;SHA1Before&quot;:&quot;88131302f664df6a657c9ca49d152da536fe5729&quot;,&quot;SHA1After&quot;:&quot;8d1454b73831644181e962c1fa0ea4e2da4124a3&quot;,&quot;Position&quot;:2453049,&quot;Content&quot;:117},{&quot;FileName&quot;:&quot;WeChatWin.dll&quot;,&quot;Version&quot;:&quot;2.6.8.51&quot;,&quot;SHA1Before&quot;:&quot;d0a5517b1292a751501b00b4b1f0702db2d9fc30&quot;,&quot;SHA1After&quot;:&quot;53e7b1525d49bf2c3250a8131ff0ba2510779b78&quot;,&quot;Position&quot;:2452614,&quot;Content&quot;:116},{&quot;FileName&quot;:&quot;WeChatWin.dll&quot;,&quot;Version&quot;:&quot;2.6.8.37&quot;,&quot;SHA1Before&quot;:&quot;7e01f8b04a158a4a50bc5a6e67c2fb8b02233170&quot;,&quot;SHA1After&quot;:&quot;a1895 [字符串的其余部分被截断]&quot;; 的本地化字符串。
+        /// </summary>
+        internal static string PatchJson {
+            get {
+                return ResourceManager.GetString("PatchJson", resourceCulture);
+            }
+        }
+    }
+}
diff --git a/RevokeMsgPatcher/Properties/Resources.resx b/RevokeMsgPatcher/Properties/Resources.resx
new file mode 100644
index 0000000..27ac4a3
--- /dev/null
+++ b/RevokeMsgPatcher/Properties/Resources.resx
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="PatchJson" xml:space="preserve">
+    <value>[{"FileName":"WeChatWin.dll","Version":"2.6.8.52","SHA1Before":"88131302f664df6a657c9ca49d152da536fe5729","SHA1After":"8d1454b73831644181e962c1fa0ea4e2da4124a3","Position":2453049,"Content":117},{"FileName":"WeChatWin.dll","Version":"2.6.8.51","SHA1Before":"d0a5517b1292a751501b00b4b1f0702db2d9fc30","SHA1After":"53e7b1525d49bf2c3250a8131ff0ba2510779b78","Position":2452614,"Content":116},{"FileName":"WeChatWin.dll","Version":"2.6.8.37","SHA1Before":"7e01f8b04a158a4a50bc5a6e67c2fb8b02233170","SHA1After":"a1895004415fe9bcd7e690bd6e482b833b515599","Position":2452614,"Content":116},{"FileName":"WeChatWin.dll","Version":"2.6.7.57","SHA1Before":"80a91aaf941bcb1c24a7d672838ac73e9ebb2e40","SHA1After":"a0d3f9a45a835f97aef7fe0872387d8cfb5c25a4","Position":2433413,"Content":116},{"FileName":"WeChatWin.dll","Version":"2.6.7.40","SHA1Before":"04bd0cb28df6630b518f42a3f9c2caa4a9359fbc","SHA1After":"13c91cf1d4609959771fd137b9a86a5ca365e1b6","Position":2432934,"Content":116},{"FileName":"WeChatWin.dll","Version":"2.6.7.32","SHA1Before":"a02519c1007ee6723947c262c720d63c619f633e","SHA1After":"f3007471ca8734c29783c25f0bb49949a783a44","Position":2432806,"Content":116},{"FileName":"WeChatWin.dll","Version":"2.6.6.28","SHA1Before":"0b19cb17a62c3ea0efce0fb675a1d3b17845cba3","SHA1After":"260948656725446b818ea668273ceff02ddfb44d","Position":2401678,"Content":116}]</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/RevokeMsgPatcher/Properties/Settings.Designer.cs b/RevokeMsgPatcher/Properties/Settings.Designer.cs
new file mode 100644
index 0000000..1de01ec
--- /dev/null
+++ b/RevokeMsgPatcher/Properties/Settings.Designer.cs
@@ -0,0 +1,30 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace RevokeMsgPatcher.Properties
+{
+
+
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "11.0.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase
+    {
+
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+
+        public static Settings Default
+        {
+            get
+            {
+                return defaultInstance;
+            }
+        }
+    }
+}
diff --git a/RevokeMsgPatcher/Properties/Settings.settings b/RevokeMsgPatcher/Properties/Settings.settings
new file mode 100644
index 0000000..3964565
--- /dev/null
+++ b/RevokeMsgPatcher/Properties/Settings.settings
@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>
diff --git a/RevokeMsgPatcher/RevokeMsgPatcher.csproj b/RevokeMsgPatcher/RevokeMsgPatcher.csproj
new file mode 100644
index 0000000..5b77683
--- /dev/null
+++ b/RevokeMsgPatcher/RevokeMsgPatcher.csproj
@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{977BF781-CED8-4389-9404-0FA08FDF21DF}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>RevokeMsgPatcher</RootNamespace>
+    <AssemblyName>RevokeMsgPatcher</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ApplicationIcon>icon.ico</ApplicationIcon>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Web.Extensions" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Deployment" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="FormMain.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="FormMain.Designer.cs">
+      <DependentUpon>FormMain.cs</DependentUpon>
+    </Compile>
+    <Compile Include="Model\TargetFile.cs" />
+    <Compile Include="Patcher.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Util.cs" />
+    <EmbeddedResource Include="FormMain.resx">
+      <DependentUpon>FormMain.cs</DependentUpon>
+    </EmbeddedResource>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Resources.resx</DependentUpon>
+      <DesignTime>True</DesignTime>
+    </Compile>
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="icon.ico" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>
\ No newline at end of file
diff --git a/RevokeMsgPatcher/Util.cs b/RevokeMsgPatcher/Util.cs
new file mode 100644
index 0000000..32e8668
--- /dev/null
+++ b/RevokeMsgPatcher/Util.cs
@@ -0,0 +1,102 @@
+using Microsoft.Win32;
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace RevokeMsgPatcher
+{
+    public class Util
+    {
+
+        /// <summary>
+        /// 自动查找安装路径
+        /// </summary>
+        /// <returns>安装路径</returns>
+        public static string AutoFindInstallPath()
+        {
+            // 微信的注册表路径
+            RegistryKey key = Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Uninstall\WeChat");
+            object installLocation = key.GetValue("InstallLocation");
+            key.Close();
+            if (installLocation == null || string.IsNullOrEmpty(installLocation.ToString()) || !IsWechatInstallPath(installLocation.ToString()))
+            {
+                // 从默认安装目录查找
+                string[] drives = Environment.GetLogicalDrives(); //获取当前计算机逻辑磁盘名称列表
+                foreach (string d in drives)
+                {
+                    string assertPath = Path.Combine(d, @"Program Files (x86)\Tencent\WeChat");
+                    if (IsWechatInstallPath(assertPath))
+                    {
+                        return assertPath;
+                    }
+                }
+            }
+            else
+            {
+                return installLocation.ToString();
+            }
+            return null;
+        }
+
+        /// <summary>
+        /// 通过文件是否存在判断是否是安装目录
+        /// </summary>
+        /// <param name="path">安装目录</param>
+        /// <returns></returns>
+        public static bool IsWechatInstallPath(string path)
+        {
+            return File.Exists(Path.Combine(path, "WeChatWin.dll")) && File.Exists(Path.Combine(path, "WeChat.exe"));
+        }
+
+        /// <summary>
+        /// 获取文件版本
+        /// </summary>
+        /// <param name="path"></param>
+        /// <returns></returns>
+        public static string GetFileVersion(string path)
+        {
+            FileVersionInfo fileVersionInfo = FileVersionInfo.GetVersionInfo(path);
+            return fileVersionInfo.FileVersion;
+        }
+
+        /// <summary>
+        /// 计算文件SHA1
+        /// </summary>
+        /// <param name="s"></param>
+        /// <returns></returns>
+        public static string ComputeFileSHA1(string s)
+        {
+            FileStream file = new FileStream(s, FileMode.Open);
+            SHA1 sha1 = new SHA1CryptoServiceProvider();
+            byte[] retval = sha1.ComputeHash(file);
+            file.Close();
+
+            StringBuilder sc = new StringBuilder();
+            for (int i = 0; i < retval.Length; i++)
+            {
+                sc.Append(retval[i].ToString("x2"));
+            }
+            return sc.ToString();
+        }
+
+        /// <summary>
+        /// 修改文件指定位置的字节
+        /// </summary>
+        /// <param name="path">WeChatWin.dll 的路径</param>
+        /// <param name="position">偏移位置</param>
+        /// <param name="after">修改后的值</param>
+        /// <returns></returns>
+        public static bool EditHex(string path, long position, byte after)
+        {
+            using (var stream = new FileStream(path, FileMode.Open, FileAccess.ReadWrite))
+            {
+                stream.Position = position;
+                stream.WriteByte(after);
+            }
+            return true;
+
+        }
+    }
+}
diff --git a/RevokeMsgPatcher/icon.ico b/RevokeMsgPatcher/icon.ico
new file mode 100644
index 0000000..cf59834
Binary files /dev/null and b/RevokeMsgPatcher/icon.ico differ