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RECT rc;
rc.left = 0;
rc.bottom = 100;
rc.right = 100;
rc.top = 0;
CWindowDC wndDC(GetDesktopWindow());
CPen pen; pen.CreatePen( PS_SOLID,1,RGB(255,0,0));
wndDC.SelectObject(&pen);
wndDC.MoveTo( rc.left+2,rc.top+2 );
wndDC.LineTo( rc.right-2,rc.top+2 );
wndDC.LineTo( rc.right-2,rc.bottom-2 );
wndDC.LineTo( rc.left+2,rc.bottom-2 );
wndDC.LineTo( rc.left+2,rc.top+2 ); //改成输出文字