如何在服务（Service）程序中显示对话框

原文：http://www.vckbase.com/index.php/wv/94

服务程序（Service）一般是不能和用户进行交互的，所以他一般是不能显示窗口的。要和用户进行交互（如显示窗口），我们必须打开用户WinSta0和desktop,下面的这段代码就是打开上述两个，并显示一个dialog：

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01.

BOOL

CServiceModule::ShowMsgDlg(

void

)

02.

{

03.

HDESK

hdeskCurrent;

04.

HDESK

hdesk;

05.

HWINSTA

hwinstaCurrent;

06.

HWINSTA

hwinsta;

07.

08.

hwinstaCurrent
= GetProcessWindowStation();

09.

if

(hwinstaCurrent
== NULL){

10.

LogEvent(_T(

"get
window station err"

));

11.

return

FALSE;

12.

}

13.

14.

hdeskCurrent
= GetThreadDesktop(GetCurrentThreadId());

15.

if

(hdeskCurrent
== NULL){

16.

LogEvent(_T(

"get
window desktop err"

));

17.

return

FALSE;

18.

}

19.

20.

//打开winsta0

21.

hwinsta
= OpenWindowStation(

"winsta0"

,
FALSE,

22.

WINSTA_ACCESSCLIPBOARD
|

23.

WINSTA_ACCESSGLOBALATOMS
|

24.

WINSTA_CREATEDESKTOP
|

25.

WINSTA_ENUMDESKTOPS
|

26.

WINSTA_ENUMERATE
|

27.

WINSTA_EXITWINDOWS
|

28.

WINSTA_READATTRIBUTES
|

29.

WINSTA_READSCREEN
|

30.

WINSTA_WRITEATTRIBUTES);

31.

if

(hwinsta
== NULL){

32.

LogEvent(_T(

"open
window station err"

));

33.

34.

return

FALSE;

35.

}

36.

37.

if

(!SetProcessWindowStation(hwinsta)){

38.

LogEvent(_T(

"Set
window station err"

));

39.

40.

return

FALSE;

41.

}

42.

43.

//打开desktop

44.

hdesk
= OpenDesktop(

"default"

,
0, FALSE,

45.

DESKTOP_CREATEMENU
|

46.

DESKTOP_CREATEWINDOW
|

47.

DESKTOP_ENUMERATE
|

48.

DESKTOP_HOOKCONTROL
|

49.

DESKTOP_JOURNALPLAYBACK
|

50.

DESKTOP_JOURNALRECORD
|

51.

DESKTOP_READOBJECTS
|

52.

DESKTOP_SWITCHDESKTOP
|

53.

DESKTOP_WRITEOBJECTS);

54.

if

(hdesk
== NULL){

55.

LogEvent(_T(

"Open
desktop err"

));

56.

57.

return

FALSE;

58.

}

59.

60.

SetThreadDesktop(hdesk);

61.

62.

//到这一步，我们获取了和用户交互（如显示窗口）的权利

63.

CMsgDlg
dlgMsg;

64.

//显示一个dialog

65.

dlgMsg.DoModal();

66.

67.

if

(!SetProcessWindowStation(hwinstaCurrent))

68.

return

FALSE;

69.

70.

if

(!SetThreadDesktop(hdeskCurrent))

71.

return

FALSE;

72.

73.

if

(!CloseWindowStation(hwinsta))

74.

return

FALSE;

75.

76.

if

(!CloseDesktop(hdesk))

77.

return

FALSE;

78.

79.

return

TRUE;

80.

}