Envoyer un message Windows avec SendMessage
unit Unit1;
interface
uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure Ear( var Message: TMessage); message WM_User + 4242;
//Important - Handler that receive the Message
private
{ Private-Deklarationen }
public
{ Public-Deklarationen }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
txt: string;
begin
txt := 'Hello World';
SendMessage(form1.Handle, WM_User + 4242, 0, DWORD(PChar(txt)));
end;
//To receive this Message that is addressed to form1.handle you need a messagehandler at form1
procedure TForm1.Ear( var Message: TMessage);
var
txt: PCHar;
begin
txt := PCHar(Message.LParam);
ShowMessage(txt);
Message.Result := 1;
end;
end.