有时常需要查找当前有哪些窗口打开着，所以先用一种方法写下来：
效果：
//工程文件program Project1;uses Forms, Unit1 in 'Unit1.pas' {Form1};{$R *.res}begin Application.Initialize; Application.MainFormOnTaskbar := True; Application.CreateForm(TForm1, Form1); Application.Run;end.// 单元文件unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls;type TForm1 = class(TForm) Button1: TButton; ListBox1: TListBox; Label1: TLabel; Button2: TButton; procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); procedure FormCreate(Sender: TObject); procedure FormDestroy(Sender: TObject); procedure ListBox1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; function EnumWindowsProc(hwnd: HWND; lparam: Integer): Boolean ; stdcall;var Form1: TForm1; slist: TStringList;implementation{$R *.dfm}procedure TForm1.Button2Click(Sender: TObject);begin ListBox1.Clear;end;procedure TForm1.FormCreate(Sender: TObject);begin slist := TStringList.Create;end;procedure TForm1.FormDestroy(Sender: TObject);begin slist.Free;end;procedure TForm1.ListBox1Click(Sender: TObject);begin SetWindowText(Handle,ListBox1.Items[ListBox1.ItemIndex]);end;function EnumWindowsProc(hwnd: HWND; lparam: Integer):Boolean;var buf: array[Byte] of char; swnd: string;begin GetWindowText(hwnd, buf, sizeof(buf)); //取得窗口标题 swnd := Inttostr(hwnd); slist.Add('窗口句柄：'+swnd +'---'+'标题：'+ buf); Result := True; //重要end;procedure TForm1.Button1Click(Sender: TObject);begin EnumWindows(@EnumWindowsProc, 0); ListBox1.Items.Assign(slist);end;end.//窗体代码object Form1: TForm1 Left = 0 Top = 0 BorderIcons = [biSystemMenu, biMinimize] Caption = 'Form1' ClientHeight = 295 ClientWidth = 448 Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'Tahoma' Font.Style = [] OldCreateOrder = False Position = poScreenCenter OnCreate = FormCreate OnDestroy = FormDestroy PixelsPerInch = 96 TextHeight = 13 object Label1: TLabel Left = 8 Top = 8 Width = 121 Height = 18 AutoSize = False Caption = #24403#21069#30340#39030#23618#31383#21475#26377#65306 end object Button1: TButton Left = 352 Top = 48 Width = 75 Height = 41 Caption = #26597#25214 TabOrder = 0 OnClick = Button1Click end object ListBox1: TListBox Left = 8 Top = 32 Width = 298 Height = 257 ItemHeight = 13 TabOrder = 1 OnClick = ListBox1Click end object Button2: TButton Left = 352 Top = 184 Width = 75 Height = 41 Caption = #28165#31354 TabOrder = 2 OnClick = Button2Click endend