GDI+中使用Image从IStream创建图像

首先：创建内存文件，并将数据放入
BYTE* lpDataImg=new BYTE[length];
memcpy(lpDataImg,lpData,length);
m_image=NULL;
CMemFile memFile(lpData,length);
int size=memFile.GetLength();
IStream* pStmBmp = NULL;
HGLOBAL hMemBmp = GlobalAlloc(GMEM_FIXED, size);
if (hMemBmp == NULL) return;
创建流：
CreateStreamOnHGlobal(hMemBmp, FALSE, &pStmBmp);
if (pStmBmp == NULL)
{
GlobalFree(hMemBmp);
}

BYTE* pbyBmp = (BYTE *)GlobalLock(hMemBmp);
memFile.SeekToBegin();
memFile.Read(pbyBmp, size);

m_image=new Image(pStmBmp,FALSE);
if(m_image==NULL)
{
GlobalFree(hMemBmp);
delete lpDataImg;
}
m_ImageData.nWidth=m_image->GetWidth();
m_ImageData.nHeight=m_image->GetHeight();
delete lpDataImg;