C / C++ / MFC

DavidCrow wrote:

It stands to reason

Rajesh R Subramanian wrote:

Can you be a little less lazier than that?

How to Convert a BMP Image to a JPEG ...

#include <atlimage.h>
...
	CImage bmpimg;
	bmpimg.Load(_T("c:\\some.bmp"));
	bmpimg.Save(_T("c:\\some.jpg"), ImageFormatJPEG);

Mark Salsbery
Microsoft MVP - Visual C++

#include <atlimage.h>
...
	CImage img;
	img.Load(_T("c:\\some.jpg"));
	img.Save(_T("c:\\some.bmp"), ImageFormatBMP);

Mark Salsbery
Microsoft MVP - Visual C++

#include <gdiplus.h>


// This function stolen from the GDI+ docs

int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
	UINT  num = 0;          // number of image encoders
	UINT  size = 0;         // size of the image encoder array in bytes

	ImageCodecInfo* pImageCodecInfo = NULL;

	GetImageEncodersSize(&num, &size);
	if(size == 0)
		return -1;  // Failure

	pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
	if(pImageCodecInfo == NULL)
		return -1;  // Failure

	GetImageEncoders(num, size, pImageCodecInfo);

	for(UINT 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
}


...

// Convert a JPEG to a BMP with GDI+

	ULONG dwToken;
	Gdiplus::GdiplusStartupInput input;
	Gdiplus::GdiplusStartupOutput output;
	Gdiplus::Status status = Gdiplus::GdiplusStartup(&dwToken, &input, &output);
	if(status == Gdiplus::Ok)
	{
		Gdiplus::Bitmap *pSrcBitmap = new Gdiplus::Bitmap(L"c:\\test.jpg", FALSE);
		CLSID bmpClsid;
		GetEncoderClsid(L"image/bmp", &bmpClsid);
		pSrcBitmap->Save(L"c:\\test.bmp", &bmpClsid);
		delete pSrcBitmap;

		Gdiplus::GdiplusShutdown(dwToken);
	}

Mark Salsbery
Microsoft MVP - Visual C++