Graphic API, stretch

Hi All,

I have a picture, I want to it be repaint as stretch not original size.

I know how to use stretch API.

but I remember that is copy from a HDC, how to do that in my app?

Best regards,
Boki.

///////////////////////////////////////////////////////////////////////////////
    case WM_PAINT:
            hdc = BeginPaint(hWnd, &ps);
        // TextOut (hdc, 10, 250, psText, 9) ;
            if (gpPicture)
            {

                // get width and height of picture
                long hmWidth;
                long hmHeight;
                gpPicture->get_Width(&hmWidth);
                gpPicture->get_Height(&hmHeight);
                // convert himetric to pixels
                int nWidth = MulDiv(hmWidth, GetDeviceCaps(hdc, LOGPIXELSX),
HIMETRIC_INCH);
                int nHeight = MulDiv(hmHeight, GetDeviceCaps(hdc, LOGPIXELSY),
HIMETRIC_INCH);
                RECT rc;
                GetClientRect(hWnd, &rc);
                // display picture using IPicture::Render
                gpPicture->Render(hdc, 0, 0, nWidth, nHeight, 0, hmHeight, hmWidth,
-hmHeight, &rc);

            }
            EndPaint(hWnd, &ps);
            break;
///////////////////////////////////////////////////////////////////////////////