【delphi源码】监视剪贴板中的内容变化

unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, Clipbrd, StdCtrls;
type
TForm1 = class(TForm)
Memo1: TMemo;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
{ Private declarations }
procedure ClipboardChanged(var AMessage: TMessage); message WM_DRAWCLIPBOARD;
public
{ Public declarations }
end;
var
Form1: TForm1;
NextClipHwnd:HWND;
//观察链中下一个窗口句柄
implementation
{$R *.dfm}
procedure TForm1.ClipboardChanged(var AMessage: TMessage);
begin
SendMessage(NextClipHwnd,AMessage.Msg,AMessage.WParam,AMessage.LParam);
//将WM_DRAWCLIPBOARD消息传递到下一个观察链中的窗口
if (Clipboard.HasFormat(CF_TEXT) or Clipboard.HasFormat(CF_OEMTEXT)) then
begin
Memo1.Lines.Text:=Clipboard.asText;
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
NextClipHwnd:=SetClipBoardViewer(Handle);
//获得观察链中下一个窗口句柄
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
ChangeClipboardChain(Handle,NextClipHwnd);
//从观察链中删除本观察窗口
SendMessage(NextClipHwnd,WM_CHANGECBCHAIN,Handle,NextClipHwnd);
//将WM_DRAWCLIPBOARD消息传递到下一个观察链中的窗口
end;
end.