registermessagesendu.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 RegisterMessageSendU;

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 the user defined message}
  UserMessage := RegisterWindowMessage('System Wide User Defined Message');
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  ReturnValue: LRESULT;   // holds the result returned by SendMessage
begin
  {send the user defined message to the specified window}
  ReturnValue := SendMessage(FindWindow('TForm1','RegisterMessage Get Example'),
                             UserMessage, 0, 0);

  {display the result of the message processing}
  Button1.Caption := 'SendMessage Result: '+IntToStr(ReturnValue);
end;

end.