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05.02.2008 at 10:25AM PDT, ID: 23372362
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Memory Buffer into GDI+ Image(FromStream)

Asked by M204 in C++ Programming Language

Tags: C++, C++, GDI+, IStream

I have the following code that loads a bitmap file from a zip file (using Zip Utils) and copies the memory buffer into a HGblobal, so that it can be loaded into a GDI+ Image object from a Stream.
The code compiles fine - however the bitmap is corrupt. Am I using the correct methods here?

Appreciate any thoughts or suggestions.Start Free Trial 
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void CASI::LoadResources(std::wstring strFolder)
{
	std::wstring strPath; 
	HGLOBAL hBuffer;
 
	strPath = strFolder + L"ASI.zip";
	HZIP hz = OpenZip(strPath.c_str(),0);
	ZIPENTRY ze; int i; FindZipItem(hz,L"background.bmp",true,&i,&ze);
	char *ibuf = new char[ze.unc_size];
	hBuffer = ::GlobalAlloc(GMEM_MOVEABLE,ze.unc_size);
	UnzipItem(hz, i, ibuf, ze.unc_size);
 
	if(hBuffer)
	{
		void* pBuffer = ::GlobalLock(hBuffer);
		if(pBuffer)
		{
			CopyMemory(pBuffer, ibuf, ze.unc_size);
			IStream* pStream = NULL;
 
			if(::CreateStreamOnHGlobal(hBuffer,FALSE,&pStream) == S_OK)
			{
				m_BackImage = Gdiplus::Image::FromStream(pStream,false);
				pStream->Release();
				if(m_BackImage)
				{
					if(m_BackImage->GetLastStatus() == Ok)
					{
						::GlobalUnlock(hBuffer);
						::GlobalFree(hBuffer);
					}
				}
			}
			::GlobalUnlock(hBuffer);
		}
		::GlobalFree(hBuffer);          
	}
	delete[] ibuf;
	CloseZip(hz); 
}
[+][-]05.02.2008 at 11:22AM PDT, ID: 21488872

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[+][-]05.02.2008 at 11:23AM PDT, ID: 21488885

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[+][-]05.02.2008 at 12:03PM PDT, ID: 21489210

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[+][-]05.02.2008 at 01:15PM PDT, ID: 21489737

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About this solution

Zone: C++ Programming Language
Tags: C++, C++, GDI+, IStream
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Solution Provided By: JohnGaby
Participating Experts: 2
Solution Grade: A
 
 
 
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