C++如何加载PNG透明图片作为菜单项的图标

HBITMAP LoadImageFromResource(UINT nResourceId, LPCTSTR pszResourceName/* = "PNG"*/)
{
	HBITMAP hBitmap = NULL;
	HINSTANCE hInstance = AfxGetResourceHandle();
	HRSRC hRsrc = ::FindResource (hInstance, MAKEINTRESOURCE(nResourceId), pszResourceName); // type
	if ( hRsrc==NULL ){
		return hBitmap;
	}

	// load resource into memory
	DWORD len = SizeofResource(hInstance, hRsrc);
	BYTE* lpRsrc = (BYTE*)LoadResource(hInstance, hRsrc);
	if ( lpRsrc==NULL ){
		return hBitmap;
	}

	// Allocate global memory on which to create stream
	HGLOBAL m_hMem = GlobalAlloc(GMEM_FIXED, len);
	BYTE* pmem = (BYTE*)GlobalLock(m_hMem);
	memcpy(pmem,lpRsrc,len);
	IStream* pstm;
	CreateStreamOnHGlobal(m_hMem,FALSE,&pstm);

	// load from stream
	CImage image;
	image.Load(pstm);
	hBitmap = image.Detach();
	// free/release stuff
	GlobalUnlock(m_hMem);
	pstm->Release();
	FreeResource(lpRsrc);

	return hBitmap;
}

HBITMAP hBmpPreview = NULL;
hBmpPreview = LoadImageFromResource(IDR_PNG_PICTURE);
::SetMenuItemBitmaps(psub->m_hMenu, ID_MENU_PREVIEW_IMAGE, MF_BYCOMMAND, hBmpPreview, hBmpPreview);

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