资源中加载Png

原创于 2015-03-12 09:44:49 发布 · 641 阅读

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#资源中加载Png

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本文介绍了一个名为CPngFromResource的类，该类用于从Windows资源中加载PNG图像到IStream指针。通过构造函数指定资源ID，类内部会完成资源定位、加载和内存流创建的过程。

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class CPngFromResource
{
public:
CPngFromResource(UINT uIdRes)
{
m_Istream = NULL;
PngFromResource(uIdRes);
}
~CPngFromResource()
{
if(m_Istream)
m_Istream->Release();
}

operator IStream *()
{
return m_Istream;
}
private:
IStream *m_Istream;

IStream * PngFromResource(UINT uIdRes)
{
HRSRC hPngSrc = FindResource(AfxGetInstanceHandle(),MAKEINTRESOURCE(uIdRes),_T("PNG"));
if(hPngSrc)
{
HGLOBAL hPngGlobal = LoadResource(AfxGetInstanceHandle(),hPngSrc);
if(hPngGlobal)
{
LPVOID pSrc = LockResource(hPngGlobal);
if(pSrc)
{
ULARGE_INTEGER srcSize;
srcSize.QuadPart = SizeofResource(AfxGetApp()->m_hInstance, hPngSrc);
m_Istream = NULL;
CreateStreamOnHGlobal(NULL, TRUE, &m_Istream);
if(m_Istream)
{
m_Istream->SetSize(srcSize);
DWORD cbWritten = 0;
m_Istream->Write(pSrc, srcSize.LowPart, &cbWritten);
//VERIFY( m_Imagebg.Load(pStream) == S_OK );
return m_Istream;
}
}
}
}
return NULL;
}
};