API控件与消息函数(delphi窗体)

WinAPI: InflateRect - 改变矩形大小 //声明: InflateRect( var lprc: TRect; {要修改的矩形} dx, dy: Integer {变化值} ): BOOL; //举例: procedure TForm1.FormPaint(Sender: TObject); var R: TRect; const s = '%d,%d,%d,%d' ; begin R := Rect(60, 60, 200, 150); DrawFocusRect(Canvas.Handle, R); Canvas.TextOut(R .Left, R.Top-15, Format(s,[R.Left,R.Top,R.Right,R.Bottom])); InflateRect(R, 20, 20); DrawFocusRect(Canvas.Handle, R); Canvas.TextOut(R .Left, R.Top-15, Format(s,[R.Left,R.Top,R.Right,R.Bottom])); InflateRect(R, -40, -40); DrawFocusRect(Canvas.Handle, R); Canvas.TextOut(R .Left, R.Top-15, Format(s,[R.Left,R.Top,R.Right,R.Bottom])); end; //效果图: WinAPI: FlashWindow - 闪烁窗口 //声明: FlashWindow( hWnd: HWND; {窗口句柄} bInvert: BOOL {设为 True 才会闪烁} ): BOOL; //举例: begin FlashWindow(Handle, True); end; WinAPI: GetActiveWindow - 获取当前活动窗口的句柄 //声明: GetActiveWindow: HWND; {无参数; 返回当前活动窗口的句柄} //举例: var h: HWND; begin h := GetActiveWindow; FlashWindow(h, True); end; WinAPI: GetFocus - 获取当前拥有焦点的窗口的句柄 //声明: GetFocus: HWND; {无参数; 返回当前拥有焦点窗口的句柄} //举例: unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls; type TForm1 = class(TForm) Button1: TButton; Memo1: TMemo; Edit1: TEdit; Timer1: TTimer; procedure Timer1Timer(Sender: TObject); end ; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.Timer1Timer(Sender: TObject); var h: HWND; begin h := GetFocus; Text := IntToStr(h); end; end. //效果图: WinAPI: GetParent - 获取指定窗口的父窗口句柄 //声明: GetParent( hWnd: HWND {窗口句柄} ): HWND; {返回父窗口句柄} //举例: procedure TForm1.Button1Click(Sender: TObject); var h1,h2: HWND; begin h1 := GetParent(Button1.Handle); h2 := Panel1.Handle; ShowMess...