NTService能交互吗？

[shi_hang_nk]

我想在用户将口令输进去之后，程序再以NTService的方式启动起来，这样在用户注销后程序仍能运转，这可以实现吗？请问如何实现？

[wyzegg]

可以实现的
看看MSDN的SERVICE FUNCTION

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[singlerace]

可以的。普通的service程序不能和用户交互是因为其desktop和正常的desktop不同。只要把service的desktop切换成正常desktop，就可以交互了。下面是msdn上的示范代码：


DWORD dwGuiThreadId = 0;

int
UserMessageBox(
RPC_BINDING_HANDLE h,
LPSTR lpszWindowStation,
LPSTR lpszDesktop,
LPSTR lpszText,
LPSTR lpszTitle,
UINT fuStyle)
{
DWORD dwThreadId;
HWINSTA hwinstaSave;
HDESK hdeskSave;
HWINSTA hwinstaUser;
HDESK hdeskUser;
int result;

// Ensure connection to service window station and desktop, and
// save their handles.

GetDesktopWindow();
hwinstaSave = GetProcessWindowStation();
dwThreadId = GetCurrentThreadId();
hdeskSave = GetThreadDesktop(dwThreadId);

// Impersonate the client and connect to the User's
// window station and desktop.

RpcImpersonateClient(h);
hwinstaUser = OpenWindowStation(lpszWindowStation, FALSE, MAXIMUM_ALLOWED);
if (hwinstaUser == NULL)
{
RpcRevertToSelf();
return 0;
}
SetProcessWindowStation(hwinstaUser);
hdeskUser = OpenDesktop(lpszDesktop, 0, FALSE, MAXIMUM_ALLOWED);
RpcRevertToSelf();
if (hdeskUser == NULL)
{
SetProcessWindowStation(hwinstaSave);
CloseWindowStation(hwinstaUser);
return 0;
}
SetThreadDesktop(hdeskUser);

// Display message box.

dwGuiThreadId = dwThreadId;
result = MessageBox(NULL, lpszText, lpszTitle, fuStyle);
dwGuiThreadId = 0;

// Restore window station and desktop.

SetThreadDesktop(hdeskSave);
SetProcessWindowStation(hwinstaSave);
CloseDesktop(hdeskUser);
CloseWindowStation(hwinstaUser);

return result;
}