VC中怎样把jpg的图片加载到对话框中作为背景解决办法

bool CreateSurfaceFromImg(
                          DXSURFACE** ppSur,
                          const WCHAR* strBMP,
                          DWORD dwImgW,/* = 0*/
                          DWORD dwImgH/* = 0*/ 
                          )
{
    WCHAR wstrFileName[MAX_PATH];
    HANDLE     hFile=::CreateFileW(strBMP, 
        GENERIC_READ ,0,0,OPEN_EXISTING, 0, 0);
    if (INVALID_HANDLE_VALUE==hFile)
    {
        wsprintfW(wstrFileName,L"Can not open the file %s",strBMP);
        MessageBoxW(NULL,wstrFileName,L"error",0L);            
        return false;
    }
    DWORD dwSize = ::GetFileSize(hFile,NULL);
    if (0 == dwSize )
    {
        wsprintfW(wstrFileName,L"File %s size invalid",strBMP);
        MessageBoxW(NULL,wstrFileName,L"error",0L);            
        return false;
    }

    //在堆中分配一块可移动的内存（利于内存回收）
    HGLOBAL hGlobal = ::GlobalAlloc(GMEM_MOVEABLE , dwSize);
    if(!hGlobal)
    {
        wsprintfW(wstrFileName,L"File %s Error allocating memory",strBMP);        
        MessageBoxW(NULL,wstrFileName,L"error",0L);            
        return false;
    }

    //锁定内存将指针指向内存的首字节
    char* pData =(char*)(::GlobalLock(hGlobal));
    if(!pData)
    {
        wsprintfW(wstrFileName,L"File %s Error locking memory",strBMP);        
        MessageBoxW(NULL,wstrFileName,L"error",0L);            
        GlobalFree(hGlobal);
        return false;
    }
    
    //将文件数据读入内存块
    DWORD  dwRead;//这个参数设为NULL的话编译通过,运行出错.

    if(false == ::ReadFile(hFile,pData,dwSize,&dwRead,NULL))
    {
        wsprintfW(wstrFileName,L"Read File %s Error",strBMP);        
        MessageBoxW(NULL,wstrFileName,L"error",0L);            
        ::GlobalFree(hGlobal);
        ::GlobalUnlock(hGlobal);
        ::CloseHandle(hFile);
        return false;
    }
    ::GlobalUnlock(hGlobal);
    ::CloseHandle(hFile);
    
    IPicture*    pPicture = NULL;    
    IStream*    pStream = NULL;

    // 不能删除内存，由pStream接管内存
    if(::CreateStreamOnHGlobal(hGlobal, false, &pStream) != S_OK)
    {
        MessageBoxW(NULL,L"CreateStreamOnHGlobal",L"error",0L);
        return false;
    }
    if (::OleLoadPicture(pStream,dwSize,
        false,IID_IPicture,(LPVOID*)(&pPicture)) != S_OK)
    {
        pStream->Release();
        MessageBoxW(NULL,L"OleLoadPicture",L"error",0L);
        return false;
    }
    

    //释放内存块
    ::GlobalFree(hGlobal);
    pStream->Release();

    // 储存图片的尺寸
    OLE_XSIZE_HIMETRIC hmW;
    OLE_YSIZE_HIMETRIC hmH;
    pPicture->get_Width(&hmW);
    pPicture->get_Height(&hmH);
    
    //在提供默认参数时计算出图片的实际尺寸
    if (0==dwImgW  &&  0==dwImgH)
    {
        HDC    hWinDC=::GetDC(NULL);
        dwImgW = ::MulDiv(hmW, ::GetDeviceCaps(hWinDC, LOGPIXELSX), 2540);
        dwImgH = ::MulDiv(hmH, ::GetDeviceCaps(hWinDC, LOGPIXELSY), 2540);
        ::ReleaseDC(NULL, hWinDC);
    }
    
    if(S_OK != CreateSurface(ppSur,dwImgW,dwImgH))
    {
        return false;
    }
    HDC    hDC;
    (*ppSur)->pdds->GetDC( &hDC );
    pPicture->Render(hDC,0,0,dwImgW,dwImgH ,0,hmH,hmW,-hmH,NULL);
    pPicture->Release();
    (*ppSur)->pdds->ReleaseDC( hDC );
    
    ::DeleteDC( hDC );    
    return true;
}
//******************************************************************//
HRESULT BltFast( int nPX,int nPY,DXSURFACE* pSur,const RECT* prcSour)
{
    RECT rc;
    if (NULL == prcSour)
        SetRect(&rc,0,0,pSur->nWidth,pSur->nHeight);
    else
        CopyRect(&rc,prcSour);

    if (  nPX > g_nBackBufferW 
        ||nPY > g_nBackBufferH    
        ||nPX + (rc.right - rc.left) < 1  
        ||nPY + (rc.bottom - rc.top) < 1 )        
        return S_OK;
    
    //裁剪矩形
    if (nPX < 0 ) 
    {
        rc.left -= nPX;
        nPX = 0 ;
    }
    if (nPY < 0 ) 
    {
        rc.top -= nPY;
        nPY = 0 ;
    }
    if (nPX+(rc.right-rc.left) > g_nBackBufferW) 
    {
        rc.right -= nPX+(rc.right-rc.left)-g_nBackBufferW;
    }
    if (nPY+(rc.bottom-rc.top) > g_nBackBufferH) 
    {
        rc.bottom -= nPY+(rc.bottom-rc.top)-g_nBackBufferH;
    }
    if (pSur->bColorKey)
        return    g_pBackBuffer->BltFast(nPX,nPY,pSur->pdds,
        &rc,DDBLTFAST_SRCCOLORKEY | DDBLTFAST_WAIT);
    else
        return    g_pBackBuffer->BltFast(nPX,nPY,pSur->pdds,
        &rc,DDBLTFAST_WAIT);
}