获取一个窗口的所有子窗口(包括嵌套) - 回复 "asian" 的问题

问题来源: http://www.cnblogs.com/del/archive/2008/12/10/1345752.html#1397451

---

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    Panel2: TPanel;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{这应该使用递归函数}
procedure GetChildWindows(h: HWND);
var
  buf: array[0..255] of Char;  {这个缓冲区是获取类名用的, 如果不需要可以删除}
begin
  h := GetWindow(h, GW_CHILD); {第一个子窗口}
  while h <> 0 do
  begin
    {下面两行是要执行的操作, 并假定只处理 TEdit}
    GetClassName(h, buf, Length(buf));
    if buf = 'TEdit' then ShowMessageFmt('%s:%d', [buf, h]);

    h := GetWindow(h, GW_HWNDNEXT); {下一个子窗口}
    GetChildWindows(h);             {递归}
  end;
end;

{测试}
procedure TForm1.Button1Click(Sender: TObject);
begin
  GetChildWindows(Handle);
end;

end.

窗体文件:

---

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 206
  ClientWidth = 318
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Panel1: TPanel
    Left = 8
    Top = 8
    Width = 177
    Height = 190
    Caption = 'Panel1'
    TabOrder = 0
    object Panel2: TPanel
      Left = 8
      Top = 112
      Width = 161
      Height = 75
      Caption = 'Panel2'
      TabOrder = 0
      object Edit5: TEdit
        Left = 24
        Top = 8
        Width = 121
        Height = 21
        TabOrder = 0
        Text = 'Edit5'
      end
    end
    object Edit3: TEdit
      Left = 32
      Top = 16
      Width = 121
      Height = 21
      TabOrder = 1
      Text = 'Edit3'
    end
    object Edit4: TEdit
      Left = 32
      Top = 43
      Width = 121
      Height = 21
      TabOrder = 2
      Text = 'Edit4'
    end
  end
  object Edit1: TEdit
    Left = 191
    Top = 24
    Width = 121
    Height = 21
    TabOrder = 1
    Text = 'Edit1'
  end
  object Edit2: TEdit
    Left = 191
    Top = 51
    Width = 121
    Height = 21
    TabOrder = 2
    Text = 'Edit2'
  end
  object Button1: TButton
    Left = 216
    Top = 152
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 3
    OnClick = Button1Click
  end
end