How to show jpg byte buffer in vc

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Next is my show jpg function:

void DisplayPic(byte* imageBuffer, CDC* pDc, int nSrcWidth, int nSrcHeight, int size)
{
	IStream * pStream = NULL; 
	IPicture * pPicture = NULL; 
	HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, size); 
	LPVOID lpBuf = ::GlobalLock(hMem); 
	memcpy(lpBuf, (void*)imageBuffer, size);
	::GlobalUnlock(hMem);
	HRESULT hr = ::CreateStreamOnHGlobal(hMem, TRUE, &amp;pStream); 
	ASSERT (SUCCEEDED(hr)); 
	hr = ::OleLoadPicture(pStream, size, FALSE, IID_IPicture, (LPVOID *)&amp;pPicture ); 
	ASSERT(hr==S_OK); //Here failed
	pPicture-&gt;Render(pDc-&gt;m_hDC, 0, 0, nSrcWidth, nSrcHeight, 0, nSrcHeight, nSrcWidth, -nSrcHeight, NULL); 
	pPicture-&gt;Release();
	GlobalFree(hMem);
}

Posted 3-Sep-10 1:25am

xisiyong

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Eugen Podsypalnikov · Answer 1 · 2010-09-03T01:41:00

Solution 1

Please see the sector 'Remarks' here[^] :)

Posted 3-Sep-10 1:41am

Eugen Podsypalnikov

Comments

xisiyong 3-Sep-10 7:46am

Thanks for your answer,I know the OleLoadPicture API,But I called Failed.

Eugen Podsypalnikov 3-Sep-10 7:48am

Do you know the supported formats listed in the section "Remarks" as well ? :)

xisiyong 3-Sep-10 7:53am

Oh,I see the "Remarks".But I still not sure that why I can use this function show JPG file,not byte buffer.
Maybe I truly don't know it.So how I show jpg byte buffer?

Eugen Podsypalnikov 3-Sep-10 7:57am

May be, you can build a JPG file from your buffer and then open it by an CImage object ? :)

xisiyong 3-Sep-10 8:02am

Ok,I will try it.It's my first time come here.Nice to meet you.

Eugen Podsypalnikov 3-Sep-10 8:04am

Where are your buffer from ? Nice to meet you :)

xisiyong 3-Sep-10 8:08am

The buffer is come form Attendance Device.

Eugen Podsypalnikov 3-Sep-10 8:10am

Wow... :)