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Delphi source code for Windows >> Send a windows message with SendMessage


Category: Windows
Title: Send a windows message with SendMessage
Date added: 15.03.2006
Hits: 44637


{
  This is useful if you want to send a message from your DLL back
  to the calling application.
}

const
  MY_MESSAGE = WM_USER + 4242;
 
type
  TForm1 = class(TForm)
    Button1: TButton;
    
procedure Button1Click(Sender: TObject);
    // Handler that receive the Message
    
procedure MessageReceiver(var msg: TMessage); message MY_MESSAGE;
  end;
var
  Form1: TForm1;
implementation
{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  txt: string;
begin
  txt := 'Hello World';
  SendMessage(Form1.Handle, MY_MESSAGE, 0, DWORD(PChar(txt)));
end;

procedure TForm1.MessageReceiver(var msg: TMessage);
var
  txt: PChar;
begin
  txt := PChar(msg.lParam);
  msg.Result := 1;
  ShowMessage(txt);
end;
end.


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