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.}

巴特西

如何在服务（Service）程序中显示对话框

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