function jTCP:Boolean; var wd : TWSAData; begin Result := true; case WSAStartup(MakeWord(2,0),wd) of WSAEINVAL,WSASYSNOTREADY,WSAVERNOTSUPPORTED:Result := False; else WSACleanup; end; end;
procedure TForm1.Button3Click(Sender: TObject); begin if jTCP then ShowMessage('已安装') else ShowMessage('没有安装'); end;