postmessagesendu.pas

DelphiWin32核心API参考光盘内容.是学习书籍中的源码,便于学习.

unit PostMessageSendU;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  UserMessage: UINT;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
  {register a user defined message}
  UserMessage := RegisterWindowMessage('PostMessage Test Message');
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  {post the user defined message to the specified window's
   message queue}
  PostMessage(FindWindow('TForm1','PostMessage Get Example'), UserMessage, 0,0);

  {this message box will pop up immediately, as PostMessage
   does not wait for the message to be processed.}
  ShowMessage('Returned');
end;

end.