如何在服务（Service）程序中显示对话框

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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：

BOOL CServiceModule::ShowMsgDlg(void)
{
       HDESK   hdeskCurrent;
    HDESK   hdesk;
    HWINSTA hwinstaCurrent;
    HWINSTA hwinsta;

    hwinstaCurrent = GetProcessWindowStation();
    if (hwinstaCurrent == NULL){
              LogEvent(_T("get window station err"));
       return FALSE;
       }

    hdeskCurrent = GetThreadDesktop(GetCurrentThreadId());
    if (hdeskCurrent == NULL){
              LogEvent(_T("get window desktop err"));
       return FALSE;
       }

//打开winsta0
    hwinsta = OpenWindowStation("winsta0", FALSE,                          
                                  WINSTA_ACCESSCLIPBOARD   |
                                  WINSTA_ACCESSGLOBALATOMS |
                                  WINSTA_CREATEDESKTOP     |
                                  WINSTA_ENUMDESKTOPS      |
                                  WINSTA_ENUMERATE         |
                                  WINSTA_EXITWINDOWS       |
                                  WINSTA_READATTRIBUTES    |
                                  WINSTA_READSCREEN        |
                                  WINSTA_WRITEATTRIBUTES);
    if (hwinsta == NULL){
              LogEvent(_T("open window station err"));

       return FALSE;
       }

    if (!SetProcessWindowStation(hwinsta)){
              LogEvent(_T("Set window station err"));

       return FALSE;
       }

//打开desktop
    hdesk = OpenDesktop("default", 0, FALSE,                
                            DESKTOP_CREATEMENU |
                            DESKTOP_CREATEWINDOW |
                            DESKTOP_ENUMERATE    |
                            DESKTOP_HOOKCONTROL  |
                            DESKTOP_JOURNALPLAYBACK |
                            DESKTOP_JOURNALRECORD |
                            DESKTOP_READOBJECTS |
                            DESKTOP_SWITCHDESKTOP |
                            DESKTOP_WRITEOBJECTS);
       if (hdesk == NULL){
              LogEvent(_T("Open desktop err"));

           return FALSE;
       }

       SetThreadDesktop(hdesk);

//到这一步，我们获取了和用户交互（如显示窗口）的权利
       CMsgDlg dlgMsg;
//显示一个dialog
       dlgMsg.DoModal();              

       if (!SetProcessWindowStation(hwinstaCurrent))
           return FALSE;

       if (!SetThreadDesktop(hdeskCurrent))
      return FALSE;

       if (!CloseWindowStation(hwinsta))
              return FALSE;

       if (!CloseDesktop(hdesk))
           return FALSE;

              return TRUE;
}
　

运行：编译生成guiser.exe, 运行guiser /service, 然后在控制面板的服务中启动该服务，将会出现一个对话框！

上述程序在win2000 professional + VC6.0 + Sp5.0 + Platform SDK 2001.8编译运行通过
如有编译不通过，请下载最新的Platform SDK

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