关于禁止程序重复启动的另一种需要与实现

关于禁止程序重复启动的另一种需要与实现

{ 函数 }
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;

{ 调用 }
procedure TForm1.FormCreate(Sender: TObject);
begin
CloseSameClassNameWindow(Handle, ClassName);
end;

program Project1;

uses
Forms, Windows, Messages,
Unit1 in 'Unit1.pas' {Form1};

{$R *.res}

begin
Application.Initialize;
SendMessage(FindWindow('TForm1', nil), WM_CLOSE, 0, 0); //假如主窗体的类名是 TForm1
Application.MainFormOnTaskbar := True;
Application.CreateForm(TForm1, Form1);
Application.Run;
end.