feat(image): 新增自动下载大图选项（win32 x64）

Co-authored-by: NineBird <CavanasD@users.noreply.github.com>

electron/services/imageDownloadService.ts

@@ -0,0 +1,174 @@
+import { app } from 'electron'
+import { join } from 'path'
+import { existsSync } from 'fs'
+import { execFile } from 'child_process'
+import { promisify } from 'util'
+// import { ConfigService } from './config'
+
+const execFileAsync = promisify(execFile)
+
+export class ImageDownloadService {
+  private static instance: ImageDownloadService
+  private koffi: any = null
+  private lib: any = null
+  private initialized = false
+  
+  private initImgHelper: any = null
+  private uninstallImgHelper: any = null
+  private getImgHelperError: any = null
+
+  private currentPid: number | null = null
+  private pollTimer: NodeJS.Timeout | null = null
+  private isHooked = false
+
+  static getInstance(): ImageDownloadService {
+    if (!ImageDownloadService.instance) {
+      ImageDownloadService.instance = new ImageDownloadService()
+    }
+    return ImageDownloadService.instance
+  }
+
+  private constructor() {
+  }
+
+  private async ensureInitialized(): Promise<boolean> {
+    if (this.initialized) return true
+    if (process.platform !== 'win32' || process.arch !== 'x64') return false
+
+    try {
+      this.koffi = require('koffi')
+      const dllPath = this.getDllPath()
+      if (!existsSync(dllPath)) {
+        console.error(`[ImageDownloadService] dll not found: ${dllPath}`)
+        return false
+      }
+
+      this.lib = this.koffi.load(dllPath)
+      this.initImgHelper = this.lib.func('bool InitImgHelper(uint32)')
+      this.uninstallImgHelper = this.lib.func('void UninstallImgHelper()')
+      this.getImgHelperError = this.lib.func('const char* GetImgHelperError()')
+      
+      this.initialized = true
+      return true
+    } catch (error) {
+      console.error('[ImageDownloadService] failed to initialize:', error)
+      return false
+    }
+  }
+
+  private getDllPath(): string {
+    const isPackaged = app.isPackaged
+    const candidates: string[] = []
+    
+    if (isPackaged) {
+      candidates.push(join(process.resourcesPath, 'resources', 'image', 'win32', 'x64', 'img_helper.dll'))
+    } else {
+      candidates.push(join(process.cwd(), 'resources', 'image', 'win32', 'x64', 'img_helper.dll'))
+    }
+
+    for (const path of candidates) {
+      if (existsSync(path)) return path
+    }
+    return candidates[0]
+  }
+
+  private async findMainWeChatPid(): Promise<number | null> {
+    try {
+      const script = `
+      Get-CimInstance Win32_Process -Filter "Name = 'Weixin.exe'" | 
+      Select-Object ProcessId, CommandLine | 
+      ConvertTo-Json -Compress
+    `;
+
+      const { stdout } = await execFileAsync('powershell', ['-NoProfile', '-Command', script])
+      if (!stdout || !stdout.trim()) return null
+
+      let processes = JSON.parse(stdout.trim())
+      if (!Array.isArray(processes)) processes = [processes]
+
+      const target = processes
+          .filter((p: any) => p.CommandLine && p.CommandLine.toLowerCase().includes('weixin.exe'))
+          .sort((a: any, b: any) => a.CommandLine.length - b.CommandLine.length)[0]
+
+      return target ? target.ProcessId : null;
+    } catch (e) {
+      return null
+    }
+  }
+
+  async startAutoDownload() {
+    if (!await this.ensureInitialized()) return
+    
+    if (this.pollTimer) return
+    
+    this.pollTimer = setInterval(() => this.checkAndHook(), 30000)
+    // Initial check
+    await this.checkAndHook()
+  }
+
+  async stopAutoDownload() {
+    if (this.pollTimer) {
+      clearInterval(this.pollTimer)
+      this.pollTimer = null
+    }
+    await this.unhook()
+  }
+
+  private async checkAndHook() {
+    const pid = await this.findMainWeChatPid()
+    
+    if (!pid) {
+      if (this.isHooked) {
+        console.log('[ImageDownloadService] WeChat exited, unhooking')
+        await this.unhook()
+      }
+      return
+    }
+
+    if (this.isHooked && this.currentPid === pid) {
+      return
+    }
+
+    if (this.isHooked && this.currentPid !== pid) {
+      console.log('[ImageDownloadService] WeChat PID changed, re-hooking')
+      await this.unhook()
+    }
+
+    console.log(`[ImageDownloadService] attempting to hook PID: ${pid}`)
+    try {
+      const success = this.initImgHelper(pid)
+      if (success) {
+        this.isHooked = true
+        this.currentPid = pid
+        console.log('[ImageDownloadService] hook successful')
+      } else {
+        const err = this.getImgHelperError()
+        console.error(`[ImageDownloadService] hook failed: ${err}`)
+      }
+    } catch (e) {
+      console.error('[ImageDownloadService] InitImgHelper call crashed:', e)
+    }
+  }
+
+  private async unhook() {
+    if (this.isHooked && this.uninstallImgHelper) {
+      try {
+        this.uninstallImgHelper()
+      } catch (e) {
+        console.error('[ImageDownloadService] uninstall failed:', e)
+      }
+    }
+    this.isHooked = false
+    this.currentPid = null
+  }
+
+  async getStatus() {
+    return {
+      isHooked: this.isHooked,
+      pid: this.currentPid,
+      supported: process.platform === 'win32' && process.arch === 'x64'
+    }
+  }
+}
+
+export const imageDownloadService = ImageDownloadService.getInstance()