Dateivorschau

Oli_1977

Hallo,

weiß jemand wie man eine Dateivorschau wie beim Windowsexplorer unter Details realisiert?

Ich möchte eine Vorschau auf ein PDF anzeigen lassen.

Oli_1977

dEUs

recht kompliziert.

ich schmeiß dir einfach kommentarlos einen Code hin. Schlau werden musst du daraus selbst

Gdiplus::Image* Globals::loadPreview (const CString &filename) {

  IShellFolder *deskFolder = NULL; 
  HBITMAP hBmpImage = NULL;
  HRESULT hr = SHGetDesktopFolder(&deskFolder); 
  if (!FAILED(hr)) {

    CComBSTR oleFile = filename;
    LPITEMIDLIST pidlLocal = NULL; 
    hr = deskFolder->ParseDisplayName(NULL, NULL, oleFile, NULL, &pidlLocal, NULL); 

    if (!FAILED(hr)) { 
	    LPITEMIDLIST l = ILFindLastID(pidlLocal);
      LPITEMIDLIST pidlRelative = ILClone(l); 
      ILRemoveLastID(pidlLocal); 

      IShellFolder *appObject = NULL; 
      hr = deskFolder->BindToObject(pidlLocal, NULL, IID_IShellFolder, (void**)&appObject); 
      ILFree(pidlLocal); 

      if (!FAILED(hr)) {

        IExtractImage* pIExtract = NULL;
        hr = appObject->GetUIObjectOf(NULL, 1, (LPCITEMIDLIST*)&pidlRelative, IID_IExtractImage, 
                                      NULL, (void**)&pIExtract); 

        if (!FAILED(hr)) {
          DWORD dwRecClrDepth = 24;
          SIZE prgSize = { IMAGE_WIDTH, IMAGE_HEIGTH };

          OLECHAR wszPathBuffer[MAX_PATH];
          DWORD dwPriority = 0;   // IEI_PRIORITY_NORMAL is defined nowhere!
          DWORD dwFlags = IEIFLAG_SCREEN;
          hr = pIExtract->GetLocation(wszPathBuffer, MAX_PATH, &dwPriority,
                                      &prgSize, dwRecClrDepth, &dwFlags);
           // even if we've got shell v4.70+, not all files support thumbnails 
          if(NOERROR == hr || E_PENDING == hr) {
            hr = pIExtract->Extract(&hBmpImage);
          }
          pIExtract->Release();
        } 
        appObject->Release(); 
        ILFree(pidlRelative); 
      } 
    } 
    deskFolder->Release(); 
  }
  Gdiplus::Bitmap* rBmp = NULL;
  if (NOERROR == hr) {
    rBmp = new Gdiplus::Bitmap(hBmpImage, NULL);
  }
  if (NULL != hBmpImage) {
    DeleteObject(hBmpImage);
  }
  return rBmp;
}