关于禁止程序重复启动的另一种需要与实现《转》

程序需要禁止重复启动, 但需要保留新的、关闭旧的.
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从主窗口的类名下手吧; 写了一个函数, 在 OnCreate 中调用即可:

 1 { 函数 }
 2 procedure CloseSameClassNameWindow(ACurrentWindow: HWND; const AClassName: string);
 3 var
 4   h: HWND;
 5   buf: array[0..255] of Char;
 6 begin
 7   h := ACurrentWindow;
 8   while h > 0 do
 9   begin
10     h := GetWindow(h, GW_HWNDNEXT);
11     GetClassName(h, buf, Length(buf));
12     if buf = AClassName then
13     begin
14       SendMessage(h, WM_CLOSE, 0, 0);
15       Break;
16     end;
17   end;
18 end;
19 
20 { 调用 }
21 procedure TForm1.FormCreate(Sender: TObject);
22 begin
23   CloseSameClassNameWindow(Handle, ClassName);
24 end;

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从程序文件中控制更简单, 一句话:

 1 program Project1;
 2 
 3 uses
 4   Forms, Windows, Messages,
 5   Unit1 in 'Unit1.pas' {Form1};
 6 
 7 {$R *.res}
 8 
 9 begin
10   Application.Initialize;
11   SendMessage(FindWindow('TForm1', nil), WM_CLOSE, 0, 0); //假如主窗体的类名是 TForm1
12   Application.MainFormOnTaskbar := True;
13   Application.CreateForm(TForm1, Form1);
14   Application.Run;
15 end.

 

posted @ 2013-09-24 18:11  冰意 LceMeaning  阅读(193)  评论(0编辑  收藏  举报