GetForegroundWindow 与 GetActiveWindow 的区别 - 回复 "delphier" 的问题
2008-12-13 16:23
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问题来源: http://www.cnblogs.com/del/archive/2008/12/13/1081644.html#1400835
GetActiveWindow 只是获取当前程序中(严格地说是线程中)被激活的窗口;
GetForegroundWindow 是获取当前系统中被激活的窗口.
两个函数的级别不一样, 一个是线程级、一个是系统级.
被激活的窗口不一定是顶层窗口(最上面的窗口).
下面的例子可以充分说明问题, 测试方法:点击三个按钮,然后反复切换焦点、观察.
代码文件:
窗体文件:
GetActiveWindow 只是获取当前程序中(严格地说是线程中)被激活的窗口;
GetForegroundWindow 是获取当前系统中被激活的窗口.
两个函数的级别不一样, 一个是线程级、一个是系统级.
被激活的窗口不一定是顶层窗口(最上面的窗口).
下面的例子可以充分说明问题, 测试方法:点击三个按钮,然后反复切换焦点、观察.
代码文件:
unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls; type TForm1 = class(TForm) Timer1: TTimer; Label1: TLabel; Label2: TLabel; Button1: TButton; Button2: TButton; Button3: TButton; procedure Button1Click(Sender: TObject); procedure Timer1Timer(Sender: TObject); procedure Button2Click(Sender: TObject); procedure FormCreate(Sender: TObject); procedure Button3Click(Sender: TObject); end; var Form1: TForm1; implementation {$R *.dfm} var i: Integer; procedure TForm1.Timer1Timer(Sender: TObject); var buf: array[Byte] of Char; begin GetWindowText(GetActiveWindow, buf, Length(buf)*SizeOf(buf[0])); Label1.Caption := 'GetActiveWindow: ' + buf; GetWindowText(GetForegroundWindow, buf, Length(buf)*SizeOf(buf[0])); Label2.Caption := 'GetForegroundWindow: ' + buf; end; procedure TForm1.Button1Click(Sender: TObject); var frm: TForm1; begin Inc(i); frm := TForm1.Create(Self); frm.FormStyle := fsNormal; frm.Text := Format('Normal %d', [i]); frm.Show; end; procedure TForm1.Button2Click(Sender: TObject); var frm: TForm1; begin Inc(i); frm := TForm1.Create(Self); frm.FormStyle := fsStayOnTop; frm.Text := Format('StayOnTop %d', [i]); frm.Show; end; procedure TForm1.Button3Click(Sender: TObject); begin WinExec('notepad.exe', SW_NORMAL); WinExec('calc.exe', SW_NORMAL); end; procedure TForm1.FormCreate(Sender: TObject); begin Timer1.Interval := 100; Button1.Caption := '建立一般窗口'; Button2.Caption := '建立顶层窗口'; Button3.Caption := '启动记事本和计算器'; end; end.
窗体文件:
object Form1: TForm1 Left = 0 Top = 0 Caption = 'Form1' ClientHeight = 155 ClientWidth = 250 Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'Tahoma' Font.Style = [] OldCreateOrder = False OnCreate = FormCreate PixelsPerInch = 96 TextHeight = 13 object Label1: TLabel Left = 32 Top = 24 Width = 281 Height = 17 Caption = 'Label1' end object Label2: TLabel Left = 32 Top = 47 Width = 281 Height = 17 Caption = 'Label2' end object Button1: TButton Left = 24 Top = 87 Width = 97 Height = 25 Caption = 'Button1' TabOrder = 0 OnClick = Button1Click end object Button2: TButton Left = 136 Top = 87 Width = 97 Height = 25 Caption = 'Button2' TabOrder = 1 OnClick = Button2Click end object Button3: TButton Left = 24 Top = 118 Width = 209 Height = 25 Caption = 'Button3' TabOrder = 2 OnClick = Button3Click end object Timer1: TTimer OnTimer = Timer1Timer Left = 208 Top = 56 end end
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