關于禁止程式重複啟動的另一種需要與實現

手頭的程式需要禁止重複啟動, 但需要保留新的、關閉舊的.

我想還是從主視窗的類名下手吧; 寫了一個函數, 在 OnCreate 中調用即可:

{ 函數 }procedure CloseSameClassNameWindow(ACurrentWindow: HWND; const AClassName: string);var  h: HWND;  buf: array[0..255] of Char;begin  h := ACurrentWindow;  while h > 0 do  begin    h := GetWindow(h, GW_HWNDNEXT);    GetClassName(h, buf, Length(buf));    if buf = AClassName then    begin      SendMessage(h, WM_CLOSE, 0, 0);      Break;    end;  end;end;{ 調用 }procedure TForm1.FormCreate(Sender: TObject);begin  CloseSameClassNameWindow(Handle, ClassName);end;

從程式檔案中控制更簡單, 一句話:

program Project1;uses  Forms, Windows, Messages,  Unit1 in 'Unit1.pas' {Form1};{$R *.res}begin  Application.Initialize;  SendMessage(FindWindow('TForm1', nil), WM_CLOSE, 0, 0); //假如主表單的類名是 TForm1  Application.MainFormOnTaskbar := True;  Application.CreateForm(TForm1, Form1);  Application.Run;end.