Delphi 使用自定义消息

Delphi 使用自定义消息

1、先用Const 定义一个常量，例如 const WM_MyMessage=WM_USER+$200;

2、在要实现的unit中定义一个私有方法

procedure doMyMessage(var msg:TMessage);message WM_MyMessage;

3、实现这个私有方法

procedure TForm1.doMyMessage(var msg:TMessage);

begin

//

if msg.Msg= WM_MyMessage then

showmessage('好啊')

else

showmessage('不好');

end;

4、最重要 把这个消息广播出去 Form1.Perform(WM_MyMessage,0,0);

下面是实现的代码

unit Unit1;

interface

uses

Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs, StdCtrls;

const WM_MyMessage=WM_USER+$200;

type

TForm1 = class(TForm)

Button1: TButton;

procedure Button1Click(Sender: TObject);

private

procedure doMyMessage(var msg:TMessage);message WM_MyMessage;

{ Private declarations }

public

{ Public declarations }

end;

var

Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.doMyMessage(var msg:TMessage);

begin

//

if msg.Msg= WM_MyMessage then

showmessage('好啊')

else

showmessage('不好');

end;

procedure TForm1.Button1Click(Sender: TObject);

begin

Form1.Perform(WM_MyMessage,0,0);

end;

end.