读注册表
RootKey:=HKEY_LOCAL_MACHINE; //设置根键值为HKEY_LOCAL_MACHINE
if OpenKey('Software/Microsoft/Windows NT/CurrentVersion/WinLogon',True) then
ReadString('DefaultDomainName',JSJMstr); //计算机名
ReadString('DefaultUserName',UserName);
ReadString('DefaultPassword',PassWord);
End;