How to display a dialog box in a service program

How to display a dialog box in a service program

Author: ac952_z_cn

Download source code

Service programs (services) generally can not interact with the user, so he is generally unable to display the window. To interact with the user (such as the display window), we must open the user WinSta0 and desktop, and the following code opens the above two and displays a 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; //Open 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; //Open 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); In this step, we get the right to interact with the user (such as the display window) Cmsgdlg dlgmsg; Displays a 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; 　 }

Run: Compile build Guiser.exe, run Guiser/service, and then start the service in the services in Control Panel, a dialog box will appear. The program above Win2000 Professional + VC6.0 + Sp5.0 + Platform SDK 2001.8 compiles and runs through if there is no compilation, please download the latest Platform SDK