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

[CPallini]

Rajesh R Subramanian wrote:

Can you be a little less lazier than that?

Yes, he can add another

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

line to the message text. ;P :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
[My articles]

[Mark Salsbery]

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

Mark Salsbery Microsoft MVP - Visual C++ :java:

[Hamid Taebi]

You can use of CImage class with Save function of it.

[reddy78]

Hi to all, I need to convert an array of bitmap to a compress format (avi, mpeg4 and so on). Do you have any idea how to do it in C++??? Regards, Daniele

[Hamid Taebi]

Do you want to make a video files?

[aa_zz]

i need covert JPEG to BMP. can you tell specific for CImage. thank very much.

[Mark Salsbery]

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

Mark Salsbery Microsoft MVP - Visual C++ :java:

[aa_zz]

this is CImage of .net. i need source = VC++6.0. thank very much

[Mark Salsbery]

CImage is a class shared by ATL and MFC these days. It uses GDI+ for image loading and saving. Here's the GDI+ version:

#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++ :java:

[aa_zz]

can you sent full code to me. wish your help. thanks very much