带有钩子的 OpenFileName 会导致 CDERR_DIALOGFAILURE

Question

我从 GetOpenFileName 收到错误 CDERR_DIALOGFAILURE。这是代码...

// 在 WndProc 中

   LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
   {        
    static HINSTANCE    hInstance;
    switch (message) 
    {  
      case WM_CREATE:
          hInstance = (HINSTANCE) GetWindowLong (hWnd, GWL_HINSTANCE);

// 在 WndProc 内的消息处理中

  case ID_READ_LOG_FILE:
  {
      OPENFILENAME  ofn;
      char      fn[MAX_PATH]="\0";
      char      filter[32]="Text Files\0*.TXT;\0\0";
      char      title[]="Open Log File";
      char      defext[]="TXT";
      int       status;

      ofn.lStructSize           = sizeof(ofn);
      ofn.hwndOwner         = hWnd;
      ofn.hInstance         = hInstance;
      ofn.lpstrFilter           = filter;
      ofn.nFilterIndex          = 0;
      ofn.lpstrCustomFilter         = NULL ;
      ofn.nMaxCustFilter        = 0 ;
      ofn.lpstrFile         = fn;
      ofn.nMaxFile          = sizeof(fn);
      ofn.lpstrFileTitle        = NULL;
      if (ReadLogFileLastDir[0] == '\0')
      {
         SHGetSpecialFolderPath (NULL,ReadLogFileLastDir,0x0005,false);
      };
      ofn.lpstrInitialDir               = ReadLogFileLastDir;
      ofn.lpstrTitle            = title;
      ofn.Flags             =  OFN_FILEMUSTEXIST  | 
                                           OFN_PATHMUSTEXIST  | 
                                       OFN_EXPLORER       | 
                                           OFN_ENABLETEMPLATE | 
                                               OFN_ENABLESIZING   | 
                                               OFN_ENABLEHOOK ;
      ofn.lpstrDefExt           = NULL;
      ofn.lpfnHook          = HookFileOpen;
      ofn.lCustData         = 1234;     // just for fun
      ofn.lpTemplateName        = MAKEINTRESOURCE(IDD_HOOKFILEOPEN);
      ofn.nFileOffset           = 0 ;
      ofn.nFileExtension        = 0 ;
      ofn.lpstrDefExt = defext;

      status = GetOpenFileName (&ofn);
      if (status == 0)
      {
    DWORD iStat, z;
    iStat = CommDlgExtendedError();
    if (iStat == CDERR_DIALOGFAILURE)

// 对话框过程看起来像这样，但从未被调用。

   UINT_PTR CALLBACK HookFileOpen (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
   {

Answer 1

我不知道到底需要什么，但我修改了对话框，使其成为具有剪辑兄弟姐妹的子项，并消除了所有其他样式和扩展样式，现在它可以工作了。