StretchDIBits() ; Help related to image scan

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VC6

C++

Win32

Hello All,

General Idea:- I am developing application win32 cleint server type (It is like desktop monitoring ).

On server side I am takeing screen shot. & sending it to client side.

On server side I have function code like
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hdc1 = GetDC(NULL);
    hdc2 = CreateCompatibleDC(hdc1);
    GetWindowRect(GetDesktopWindow(), &rc);
    w = rc.right-rc.left;
    h = rc.bottom-rc.top;

    bmih.biSize = sizeof(BITMAPINFOHEADER);
    bmih.biWidth = w;
    bmih.biHeight = h;
    bmih.biPlanes = 1;
    bmih.biBitCount = 24;
    bmih.biCompression = BI_RGB;
    bmih.biSizeImage = ((((bmih.biWidth * bmih.biBitCount) + 31) & ~31) >> 3) * bmih.biHeight;
    bi.bmiHeader = bmih;

    aBmp = CreateDIBSection(hdc1, &bi ,DIB_RGB_COLORS, (void**)&dibvalues, NULL, NULL);
    OldObj = SelectObject(hdc2, aBmp);
    BitBlt(hdc2, 0, 0, w, h, hdc1, 0, 0, SRCCOPY);

//////////////////////////////////////////////////////////////



I have class like

class DesktopScreen
{
public:
    BITMAPINFOHEADER bmih ;
    BITMAPINFO bi;
     unsigned char  dibvalues[lenght];
    };

------------------------------------------------------------------

using above code I am filling Object of this class & sending it to other side

in binary formate (byte).

On Client side deserializing is also OK (I check all value at time of debuging )

Now at time WM_Paint:
hDC = BeginPaint(hWnd, &Ps);

i=  StretchDIBits(hDC,
                         // destination rectangle
                         0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN),
                         // source rectangle
                         0, 0,desktopObj.bmih.biWidth , desktopObj.bmih.biHeight,
                         desktopObj.dibvalues,
                         &desktopObj.bi,
                         DIB_RGB_COLORS,
                         SRCCOPY);

//////////////////////////////////////////////////////////////////////////

StretchDIBits is returning 0 .

Application run properlly but image is not displying.

also if i call StretchDIBits on server side passing same info to that function.I mages is displaying.


Can you please tell me what should be the problem.

( sorry for posting code ,but I think it is necessary to get my Question to you )

Thanks ,
Ashish.