delphi SendTextMessage 等方便的消息发送函数

SendTextMessage 等方便的消息发送函数

突然发现 Message 单元的最后给提供了几个方便的消息发送函数:

SendTextMessage、SendStructMessage、SendGetStructMessage、SendGetIntMessage

虽然函数实现的很简单, 但用他们发送文本、结构和整数, 的确方便了不少; 下面仅就 SendTextMessage 举例:

//例子是通过发送消息的方法给 Edit 赋值:

unit Unit1;

interface

uses

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

Dialogs, StdCtrls;

type

TForm1 = class(TForm)

Edit1: TEdit;

Button1: TButton;

Button2: TButton;

Button3: TButton;

Button4: TButton;

procedure Button1Click(Sender: TObject);

procedure Button2Click(Sender: TObject);

procedure Button3Click(Sender: TObject);

procedure Button4Click(Sender: TObject);

end;

var

Form1: TForm1;

implementation

{$R *.dfm}

//使用传统的 SendMessage

procedure TForm1.Button1Click(Sender: TObject);

var

str: string;

begin

str := '万一1';

SendMessage(Edit1.Handle, WM_SETTEXT, 0, Integer(PChar(str)));

end;

//使用 VCL 的 Perform

procedure TForm1.Button2Click(Sender: TObject);

var

str: string;

begin

str := '万一2';

Edit1.Perform(WM_SETTEXT, 0, Integer(PChar(str)));

end;

//使用 SendTextMessage 的确方便

procedure TForm1.Button3Click(Sender: TObject);

var

str: string;

begin

str := '万一3';

SendTextMessage(Edit1.Handle, WM_SETTEXT, 0, str);

end;

//SendTextMessage 也可接受字符串常数

procedure TForm1.Button4Click(Sender: TObject);

begin

SendTextMessage(Edit1.Handle, WM_SETTEXT, 0, '万一4');

end;

end.

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