Hallo,
is zwar schon ewig her, aber ich habe hier mal ein Schnippel Code gefunden, der eine Bitmap aus einer Datei liest, vieleicht hilft dir das weiter…
if (sizeof(BITMAPINFOHEADER) != _lread (hFile, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)))
goto ErrExit;
// Check to see that it’s a Windows DIB – an OS/2 DIB would cause
// strange problems with the rest of the DIB API since the fields
// in the header are different and the color table entries are
// smaller.
//
// If it’s not a Windows DIB (e.g. if biSize is wrong), return NULL.
if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
goto ErrExit;
// Now determine the size of the color table and read it. Since the
// bitmap bits are offset in the file by bfOffBits, we need to do some
// special processing here to make sure the bits directly follow
// the color table (because that’s the format we are susposed to pass
// back)
if (!(nNumColors = (UINT)lpbi->biClrUsed))
{
// no color table for 24-bit, default size otherwise
if (lpbi->biBitCount != 24)
nNumColors = 1 biBitCount; /* standard size table */
}
// fill in some default values if they are zero
if (lpbi->biClrUsed == 0)
lpbi->biClrUsed = nNumColors;
if (lpbi->biSizeImage == 0)
{
lpbi->biSizeImage = ((((lpbi->biWidth * (DWORD)lpbi->biBitCount) + 31) & ~31) >> 3)
* lpbi->biHeight;
}
// get a proper-sized buffer for header, color table and bits
GlobalUnlock(hDIB);
hDIBtmp = GlobalReAlloc(hDIB, lpbi->biSize +
nNumColors * sizeof(RGBQUAD) +
lpbi->biSizeImage, 0);
if (!hDIBtmp) // can’t resize buffer for loading
goto ErrExitNoUnlock; //MPB
else
hDIB = hDIBtmp;
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
// read the color table
_lread (hFile, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBQUAD));
// offset to the bits from start of DIB header
offBits = lpbi->biSize + nNumColors * sizeof(RGBQUAD);
// If the bfOffBits field is non-zero, then the bits might *not* be
// directly following the color table in the file. Use the value in
// bfOffBits to seek the bits.
if (bmfHeader.bfOffBits != 0L)
_llseek(hFile, bmfHeader.bfOffBits, SEEK_SET);
if (MyRead(hFile, (LPSTR)lpbi + offBits, lpbi->biSizeImage))
goto OKExit;
==================================================================
Tschau
Peter
[Bei dieser Antwort wurde das Vollzitat nachträglich automatisiert entfernt]
