project1.dpr

在delphi中实现windows核心编程.原书光盘代码核心编程.原书光盘代码

program Project1;

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

Resourcestring
  FMutex = 'Mutex_ONLY_ONE';
{$R *.RES}
var
  hMutex: HWND;
  iRet: integer;
begin
  Application.Initialize;
  hMutex := CreateMutex(nil,False,PChar(FMutex));
  iRet := GetLastError;
  if iRet <>ERROR_ALREADY_EXISTS then
  begin
    Application.CreateForm(TForm1, Form1);
  Application.Run;
  end;
   ReleaseMutex(hMutex);
end.