HWND otherwindow;
HDC otherDC;
HDC memDC;
HBITMAP memBH;
HGDIOBJ myObject;
BITMAP bitmapbuffer;
unsigned char* buffer = NULL;

buffer = (unsigned char*) malloc (800*600*3*sizeof (char));
otherwindow = getotherwindow ();
otherDC = GetDC (otherwindow);
memDC = CreateCompatibleDC (otherDC);
memBH = CreateCompatibleBitmap (memDC, 800, 600); // Why do i get a 1x1 Bitmap here?
SetBitmapDimensionEx (memBH, 800, 600, NULL); // is this the right way to set height&width to bitmap?
BitBlt (memDC, 0, 0, 800, 600, otherDC, 0, 0, SRCCOPY); // Error, cause my created Bitmap is just 1x1 ??


// the following code should be correct, got it from the book "OpenGL Game Programming
FILE* fout;
BITMAPFILEHEADER bitmapFileHeader;
BITMAPINFOHEADER bitmapInfoHeader;
unsigned int imageIdx;
unsigned char tempRGB;
fout = fopen ("c:\\screenshot.bmp", "wb");
if (!fout) return 0;
bitmapFileHeader.bfSize = sizeof (BITMAPFILEHEADER);
bitmapFileHeader.bfType = 0x4d42;
bitmapFileHeader.bfReserved1 = 0;
bitmapFileHeader.bfReserved2 = 0;
bitmapFileHeader.bfOffBits = sizeof (BITMAPFILEHEADER) + sizeof (BITMAPINFOHEADER);

bitmapInfoHeader.biSize = sizeof (BITMAPINFOHEADER);
bitmapInfoHeader.biPlanes = 1;
bitmapInfoHeader.biBitCount = 24;
bitmapInfoHeader.biCompression = BI_RGB;
bitmapInfoHeader.biSizeImage = 800*600*3;
bitmapInfoHeader.biXPelsPerMeter = 0;
bitmapInfoHeader.biYPelsPerMeter = 0;
bitmapInfoHeader.biClrUsed = 0;
bitmapInfoHeader.biClrImportant = 0;
bitmapInfoHeader.biWidth = 800;
bitmapInfoHeader.biHeight = 600;

for (imageIdx = 0; imageIdx < bitmapInfoHeader.biSizeImage; imageIdx += 3)
{
	tempRGB = buffer[imageIdx];
	buffer[imageIdx] = buffer[imageIdx + 2];
	buffer[imageIdx + 2] = tempRGB;
}
fwrite (&bitmapFileHeader, 1, sizeof (BITMAPFILEHEADER), fout);
fwrite (&bitmapInfoHeader, 1, sizeof (BITMAPINFOHEADER), fout);
fwrite (&buffer, 1, bitmapInfoHeader.biSizeImage, fout);
fclose (fout);

DeleteObject (memBH);
ReleaseDC (gWnd, memDC);   // gWnd is a handle to my own window
ReleaseDC (otherwindow, otherDC);
free (buffer);