feat: 支持导出自定义目录并优化聊天记录读取

接入导出保存目录选择功能
修复导出路径摘要未同步更新
按时间范围查询聊天记录，避免全量扫描历史消息
增加跨分片消息查询支持验证

index.js

@@ -44,6 +44,7 @@ const api = {
   startExport: (request) => electron.ipcRenderer.invoke("export:start", request),
   cancelExport: (jobId) => electron.ipcRenderer.invoke("export:cancel", jobId),
   revealExport: (path) => electron.ipcRenderer.invoke("export:reveal", path),
+  selectExportDirectory: () => electron.ipcRenderer.invoke("export:selectDirectory"),
   onExportProgress: (callback) => {
     const listener = (_event, progress) => callback(progress);
     electron.ipcRenderer.on("export:progress", listener);

src/main/export-service.ts

@@ -928,7 +928,7 @@ async function runSingleExport(
       request.format === 'html'
         ? options.outputFolderName || safeFilePart(request.outputName)
         : `${safeFilePart(request.outputName)}_${exportStamp()}`
-    const root = options.outputRoot || (await resolveDefaultExportRoot(outputFolder))
+    const root = options.outputRoot || request.outputDirectory || (await resolveDefaultExportRoot(outputFolder))
     await fs.mkdir(root, { recursive: true })
     const outputDir = join(root, outputFolder)
     const outputPath =
@@ -1607,7 +1607,7 @@ async function runAllExport(
     }
 
     const outputFolder = safeFilePart(request.outputName)
-    const exportRoot = await resolveDefaultExportRoot(outputFolder)
+    const exportRoot = request.outputDirectory || (await resolveDefaultExportRoot(outputFolder))
     outputDir = join(exportRoot, outputFolder)
     const folderNames = conversationFolderNames(targets)
     let lastProgressAt = 0

src/main/index.ts

@@ -1164,6 +1164,11 @@ app.whenReady().then(async () => {
     if (!window) return { success: false, error: '窗口不可用' }
     return runExport(request, window, voiceRecognition || undefined)
   })
+  ipcMain.handle('export:selectDirectory', async (event) => {
+    const window = BrowserWindow.fromWebContents(event.sender)
+    const result = await dialog.showOpenDialog(window!, { properties: ['openDirectory', 'createDirectory'] })
+    return result.canceled ? { canceled: true } : { canceled: false, path: result.filePaths[0] }
+  })
   ipcMain.handle('export:cancel', (_, jobId: string) => {
     cancelExport(jobId)
     return { success: true }

src/main/wechat-db.ts

@@ -216,17 +216,11 @@ export class WechatDb {
     if (!username) return []
     if (startTime && endTime && startTime > endTime) return []
 
-    // A bounded native cursor can omit rows stored across a message shard boundary.
-    // Scan without bounds first, then apply the requested range in application code.
-    const rows = await this.wcdb4Client.getMessagesAsync(username)
-    const messages = rows
-      .map((message) => ({ ...message.raw, ...message }))
-      .filter((message) => {
-        const createTime = Number(message.msgCreateTime || 0)
-        if (startTime && createTime < startTime) return false
-        if (endTime && createTime > endTime) return false
-        return true
-      })
+    // The async client merges cursor and shard-table results while applying the
+    // time range in SQLite. Avoid loading the entire conversation when exporting
+    // a narrow range; this is especially important for chats with long history.
+    const rows = await this.wcdb4Client.getMessagesAsync(username, startTime, endTime)
+    const messages = rows.map((message) => ({ ...message.raw, ...message }))
     console.log(
       `[WechatDb] export scan username=${username} raw=${rows.length} filtered=${messages.length} start=${startTime || 0} end=${endTime || 0}`
     )

src/preload/index.d.ts

@@ -316,6 +316,7 @@ declare global {
         httpStatus?: number
       }>
       startExport: (request: ExportRequest) => Promise<ExportResult>
+      selectExportDirectory: () => Promise<{ canceled: boolean; path?: string }>
       cancelExport: (jobId: string) => Promise<{ success: boolean }>
       revealExport: (path: string) => Promise<{ success: boolean; error?: string }>
       onExportProgress: (callback: (progress: ExportJobProgress) => void) => () => void

src/preload/index.ts

@@ -209,6 +209,7 @@ const api = {
   startExport: (request: ExportRequest) => ipcRenderer.invoke('export:start', request),
   cancelExport: (jobId: string) => ipcRenderer.invoke('export:cancel', jobId),
   revealExport: (path: string) => ipcRenderer.invoke('export:reveal', path),
+  selectExportDirectory: () => ipcRenderer.invoke('export:selectDirectory'),
   onExportProgress: (callback: (progress: ExportJobProgress) => void) => {
     const listener = (_event: Electron.IpcRendererEvent, progress: ExportJobProgress): void =>
       callback(progress)

src/renderer/src/components/export/ExportWorkspace.tsx

@@ -75,6 +75,7 @@ export function ExportWorkspace({
   const [format, setFormat] = useState<ExportFormat>(() => runningAllTask?.format || 'csv')
   const [zip, setZip] = useState(() => runningAllTask?.zip === true)
   const [fileName, setFileName] = useState('')
+  const [outputDirectory, setOutputDirectory] = useState('')
   const [status, setStatus] = useState<ExportStatus>('idle')
   const [jobId, setJobId] = useState('')
   const [progress, setProgress] = useState<ExportJobProgress | null>(null)
@@ -334,6 +335,7 @@ export function ExportWorkspace({
       targets,
       format: exportFormat,
       outputName,
+      outputDirectory: outputDirectory || undefined,
       startTime: exportAll
         ? undefined
         : startOfRange
@@ -439,6 +441,10 @@ export function ExportWorkspace({
         : `文稿/TraceMemo/导出/${outputName}/`
       : `文稿/TraceMemo/导出/${outputName}.${format === 'markdown' ? 'md' : format}`
 
+  const selectedTargetPath = outputDirectory
+    ? `${outputDirectory}/${outputName}${format === 'html' ? (zip ? '.zip' : '/') : `.${format === 'markdown' ? 'md' : format}`}`
+    : targetPath
+
   return (
     <div className="export-workspace">
       <ExportContactPanel
@@ -757,8 +763,12 @@ export function ExportWorkspace({
             </label>
             <div className="export-target-path">
               <span>保存位置</span>
-              <strong>{targetPath}</strong>
-              <button type="button">选择位置</button>
+              <strong>{selectedTargetPath}</strong>
+              <button type="button" onClick={() => {
+                void window.api.selectExportDirectory().then((result) => {
+                  if (!result.canceled && result.path) setOutputDirectory(result.path)
+                })
+              }}>选择位置</button>
             </div>
             {format === 'html' && (
               <p className="export-helper-text">
@@ -776,7 +786,7 @@ export function ExportWorkspace({
                 ? '导出完成'
                 : '准备就绪'}
           </span>
-          <span className="export-target-summary">路径：{targetPath}</span>
+          <span className="export-target-summary">路径：{selectedTargetPath}</span>
           <button type="button" className="export-reset-button" onClick={resetDefaults}>
             恢复默认
           </button>

src/shared/export.ts

@@ -32,6 +32,7 @@ export interface ExportRequest {
   targets: ExportTarget[]
   format: ExportFormat
   outputName: string
+  outputDirectory?: string
   startTime?: number
   endTime?: number
   kinds: ExportMessageKind[]