LPDIRECT3DSURFACE9

VOID Render()
{
    LPDIRECT3DSURFACE9 BackBuffer = NULL;
    // Clear the back buffer to a blue color
    g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,255),
    1.0f, 0);
    // Begin the scene
    if(SUCCEEDED(g_pd3dDevice->BeginScene()))
    {
        g_pd3dDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO, &BackBuffer);
        g_pd3dDevice->UpdateSurface(g_Surface, NULL, BackBuffer, NULL);
        if(BackBuffer != NULL)
            BackBuffer->Release();
        // End the scene
        g_pd3dDevice->EndScene();
    }
    // Present the back buffer contents to the display
    g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
}