// Die GetEncoderClsid() Funktion wurde einfach aus der MSDN/PSDK Doku kopiert.
// Zu finden mit dem Suchstring "Retrieving the Class Identifier for an Encoder"
// Sucht zu z.B. 'image/jpeg' den passenden Encoder und liefert dessen CLSID...
int GetEncoderClsid(const wchar_t *format, CLSID *pClsid)
{
UINT num = 0; // number of image encoders
UINT size = 0; // size of the image encoder array in bytes
UINT j;
ImageCodecInfo* pImageCodecInfo = NULL;
GdipGetImageEncodersSize(&num, &size);
if(size == 0) return -1; // Failure
pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
if(pImageCodecInfo == NULL) return -1; // Failure
GdipGetImageEncoders(num, size, pImageCodecInfo);
for( j = 0; j < num; ++j ) {
if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 ) {
*pClsid = pImageCodecInfo[j].Clsid;
free(pImageCodecInfo);
return j; // Success
}
}
free(pImageCodecInfo);
return -1; // Failure
}
static void pSaveImageAs(HWND hwnd)
{
OPENFILENAMEW sfn;
ImageCodecInfo *codecInfo;
WCHAR szSaveFileName[MAX_PATH];
WCHAR *szFilterMask;
GUID rawFormat;
UINT num;
UINT size;
UINT sizeRemain;
UINT j;
WCHAR *c;
GdipGetImageEncodersSize(&num, &size);
codecInfo = malloc(size);
if (!codecInfo)
{
DPRINT1("malloc() failed in pSaveImageAs()\n");
return;
}
GdipGetImageEncoders(num, size, codecInfo);
GdipGetImageRawFormat(image, &rawFormat);
sizeRemain = 0;
for (j = 0; j < num; ++j)
{
// Every pair needs space for the Description, twice the Extensions, 1 char for the space, 2 for the braces and 2 for the NULL terminators.
sizeRemain = sizeRemain + (((wcslen(codecInfo[j].FormatDescription) + (wcslen(codecInfo[j].FilenameExtension) * 2) + 5) * sizeof(WCHAR)));
}
/* Add two more chars for the last terminator */
sizeRemain = sizeRemain + (sizeof(WCHAR) * 2);
szFilterMask = malloc(sizeRemain);
if (!szFilterMask)
{
DPRINT1("cannot allocate memory for filter mask in pSaveImageAs()");
free(codecInfo);
return;
}
ZeroMemory(szSaveFileName, sizeof(szSaveFileName));
ZeroMemory(szFilterMask, sizeRemain);
ZeroMemory(&sfn, sizeof(sfn));
sfn.lStructSize = sizeof(sfn);
sfn.hwndOwner = hwnd;
sfn.hInstance = hInstance;
sfn.lpstrFile = szSaveFileName;
sfn.lpstrFilter = szFilterMask;
sfn.nMaxFile = MAX_PATH;
sfn.Flags = OFN_OVERWRITEPROMPT | OFN_HIDEREADONLY;
c = szFilterMask;
for (j = 0; j < num; ++j)
{
StringCbPrintfExW(c, sizeRemain, &c, &sizeRemain, 0, L"%ls (%ls)", codecInfo[j].FormatDescription, codecInfo[j].FilenameExtension);
/* Skip the NULL character */
c++;
sizeRemain -= sizeof(*c);
StringCbPrintfExW(c, sizeRemain, &c, &sizeRemain, 0, L"%ls", codecInfo[j].FilenameExtension);
/* Skip the NULL character */
c++;
sizeRemain -= sizeof(*c);
if (IsEqualGUID(&rawFormat, &codecInfo[j].FormatID) == TRUE)
{
sfn.nFilterIndex = j + 1;
}
}
if (GetSaveFileNameW(&sfn))
{
if (GdipSaveImageToFile(image, szSaveFileName, &codecInfo[sfn.nFilterIndex - 1].Clsid, NULL) != Ok)
{
DPRINT1("GdipSaveImageToFile() failed\n");
}
}
free(szFilterMask);
free(codecInfo);
}
