图形显示 刷屏一次 内存储器增加，不释放

    CWnd *pWnd=GetDlgItem(IDC_PICTURE);
    CDC *pDC=pWnd->GetDC();
    Sleep(100);
    ShowPic(pDC,"test.bmp",290,240);

HRESULT ShowPic(CDC *pDC,CString lpstrFile, int nScrWidth, int nScrHeight)
{
    IPicture  *pPic;  
    IStream   *pStm;  
    BOOL      bResult;  
    
    HANDLE    hFile=NULL;  
    DWORD     dwFileSize,dwByteRead;  
    
    //打开硬盘中的图形文件  
    hFile=CreateFile(lpstrFile,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);  
    if (hFile!=INVALID_HANDLE_VALUE)  
    {  
        dwFileSize=GetFileSize(hFile,NULL);//获取文件字节数  
        if(dwFileSize==0xFFFFFFFF)  
        {
            CloseHandle(hFile);
            return E_FAIL;  
        }
    }  
    else  
    {  
        return E_FAIL;  
    }  
    
    
    //分配全局存储空间  
    HGLOBAL hGlobal=GlobalAlloc(GMEM_MOVEABLE,dwFileSize);  
    if(hGlobal==NULL)  
        return E_FAIL;  
    
    LPVOID  pvData =GlobalLock(hGlobal);  
    
    if(pvData==NULL)//锁定分配内存块  
    {
        GlobalFree(hGlobal);
        return E_FAIL;  
    }
    ReadFile(hFile,pvData,dwFileSize,&dwByteRead,NULL);//把文件读入内存缓冲区  
    CloseHandle(hFile);//关闭打开的文件  
    
    GlobalUnlock(hGlobal);  

    CreateStreamOnHGlobal(hGlobal,TRUE,&pStm);  
    
    //装入图形文件  
    bResult=OleLoadPicture(pStm,dwFileSize,TRUE,IID_IPicture,(LPVOID*)&pPic);  
    GlobalFree(hGlobal);
    
    if(FAILED(bResult))  
        return E_FAIL;  
    
    long   hmWidth;//图片的真实宽度  
    long   hmHeight;//图片的真实高度  
    pPic->get_Width(&hmWidth);  
    pPic->get_Height(&hmHeight);  
    
    
    //将图形输出到屏幕上（有点像BitBlt）  
    bResult=pPic->Render(pDC->m_hDC,0,0,nScrWidth,nScrHeight,0,hmHeight,hmWidth,-hmHeight,NULL);  
    
    pPic->Release();  
    
    if(SUCCEEDED(bResult))  
    {  
        return   S_OK;  
    }  
    else  
    {  
        return   E_FAIL;  
    } 
    
}