broadcastsystemmessageu.pas

来自「Delphi Win32核心API参考光盘源码 本书包含了常用的Windows」· PAS 代码 · 共 48 行

unit BroadcastSystemMessageU;

interface

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

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

var
  Form1: TForm1;
  UserMessage: UINT;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  Recipients: DWORD;  // holds the recipient flags
begin
  {set the recipients to all applications}
  Recipients := BSM_APPLICATIONS;

  {send the user defined message to all applications on the system by
   posting it to their message queues}
  BroadcastSystemMessage(BSF_IGNORECURRENTTASK or BSF_POSTMESSAGE, @Recipients,
                         UserMessage, 0, 0);
end;

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

end.