D
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;
}
