Delphi给窗体镶边-为控件加边框，描边，改变边框颜色

//1.定义方法
procedure WMNCPaint(var Msg : TWMNCPaint); message WM_NCPAINT;

//2.实现方法
procedure TForm1.WMNCPaint(var Msg: TWMNCPaint);
var
dc:hDc;
Pen:hPen;
OldPen:hPen;
OldBrush:hBrush;
begin
    inherited;
    //获取本窗口设备上下文
    dc:=GetWindowDC(Handle);
    msg.Result:=1;
    //创建画笔，实线、宽度为l、红色
    Pen:=CreatePen(PS_SOLID,1,RGB(255,0,0));
    //将新创建的画笔选入窗体的设备上下文
    OldPen:=SelectObject(dc,Pen);
    //将系统库存的空画刷入窗体的设备上下文
    OldBrush:=SelectObject(dc,GetStockObject(NULL_BRUSH));
    //给窗体“镶边”
    Rectangle(dc,0,0,Form1.Width,Form1.Height);
    //恢复旧画笔和旧画刷
    SelectObject(dc,OldBrush);
    SelectObject(dc,oldPen);
    //删除新创建的画笔，释放系统资源
    DeleteObject(Pen);
    //释放设备上下文
    ReleaseDC(Handle,Canvas.Handle);
end; 

//3.DBGrid控件描边
procedure TForm1.FormPaint(Sender: TObject);
var
Rct:   TRect;
begin
Rct:=Rect(Dbgrid1.Left-1,Dbgrid1.Top-1,Dbgrid1.Left+Dbgrid1.Width+1,Dbgrid1.top+Dbgrid1.Height+1);
with   Form1.Canvas   do
begin
   Pen.Color   :=   clRed;
   Pen.Width   :=   1;
   Brush.Style   :=   bsClear;
   Rectangle(Rct);
end;
end;