In the MainWndProc function, add code to process WM_MOUSEMOVE messages. This code outlines the selection using GDI functions . The code should appear as follows:
case WM_MOUSEMOVE:
/* Use GDI functions to outline the area to be cropped. */
if (wParam == MK_LBUTTON)
{
ThisWindowDC = GetDC(hWnd);
SavedPen = SelectObject(ThisWindowDC, GetStockObject(WHITE_PEN));
SavedBrush = SelectObject(ThisWindowDC, GetStockObject(NULL_BRUSH));
DisplayMode = GetROP2(ThisWindowDC);
SetROP2(ThisWindowDC, R2_NOT);
if (FirstDraw == FALSE)
Rectangle(ThisWindowDC, StartGDIX, StartGDIY, EndGDIX, EndGDIY);
EndGDIX = LOWORD(lParam);
EndGDIY = HIWORD(lParam);
Rectangle(ThisWindowDC, StartGDIX, StartGDIY, EndGDIX, EndGDIY);
FirstDraw = FALSE;
SetROP2(ThisWindowDC, DisplayMode);
}
return (0);
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