C / C++ / MFC

Chesnokov Yuriy wrote:

257 * 3 = 771, 771 / sizeof(DWORD) = 192.75

#define ALIGN(val)((val + 3) & ~3)
#define ISSTRIDEALIGNED(val)((val * sizeof(RGBTRIPLE)) == ALIGN(val * sizeof(RGBTRIPLE)))

DWORD OriginalWidth24(DWORD dwInStride)
{
	if(0 != dwInStride % sizeof(RGBTRIPLE))
	{
		--dwInStride;
	}
	return dwInStride / sizeof(RGBTRIPLE);
}

DWORD BestWidthEqualStride(DWORD dwWidth)
{
	while(dwWidth && (sizeof(RGBTRIPLE) * dwWidth) !=  ALIGN(dwWidth * sizeof(RGBTRIPLE)))
	{
		--dwWidth;
	}
	return dwWidth;
}

DWORD dwBitmapWidth = 257;
DWORD dwNonAlignedSize = (dwBitmapWidth * sizeof(RGBTRIPLE));
DWORD dwAlignedSize = ALIGN(dwBitmapWidth * sizeof(RGBTRIPLE));
DWORD dwOriginalWidth = OriginalWidth24(dwAlignedSize);
DWORD dwWidthEqualsStride = BestWidthEqualStride(dwBitmapWidth);

aravind.sn wrote:

... and obviously they all have common "Ok" "Apply" and "Cancel" button.

Shiv Murti Pal wrote:

DWORD dw = GetLastError();
it is 87

If the function succeeds, the return value is nonzero.

If the function fails, the return value is 0 (zero). To get extended error information, call GetLastError.

If the return value is nonzero and the number of bytes read is 0 (zero),
the file pointer is beyond the current end of the file at the time of
the read operation. However, if the file is opened with FILE_FLAG_OVERLAPPED
and lpOverlapped is not NULL, the return value is 0 (zero) and GetLastError
returns ERROR_HANDLE_EOF when the file pointer goes beyond the current end
of file.