project1.dpr

Delphi实效编程百例的随书源代码 这是其中的程序控制部分

program Project1;

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

const
  CM_RESTORE = WM_USER + $1000;

var
  RvHandle : hWnd;

{$R *.RES}

begin
  {If there's another instance already running, activate that one}
  RvHandle := FindWindow('My Delphi program!', NIL);
  if RvHandle > 0 then
  begin
    PostMessage(RvHandle, CM_RESTORE, 0, 0);
    Exit;
  end;

  {Else, do the normal stuff}
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;

end.