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case WM_LBUTTONDOWN:
fDraw = TRUE;
ptPrevious.x = LOWORD(lParam);
ptPrevious.y = HIWORD(lParam);
break;
case WM_LBUTTONUP:
if (fDraw)
{
hdc = GetDC(hWnd);
MoveToEx(hdc, ptPrevious.x, ptPrevious.y, NULL);
LineTo(hdc, LOWORD(lParam), HIWORD(lParam));
ReleaseDC(hWnd, hdc);
}
fDraw = FALSE;
break;