OpenDesktop in a Windows service fails, GetLastError returns 183
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From: Sten Westerback (MVP SDK 2005-6 :) on 1 Apr 2008 08:18 > ><jvstech(a)gmail.com> wrote in message >news:9b0873ac-adba-4eff-9df0-e76a8fec21e0(a)s19g2000prg.googlegroups.com... >On Mar 12, 11:19 pm, "Sebastian G." <se...(a)seppig.de> wrote: >> jvst...(a)gmail.com wrote: >> > I've written a Windows service in C# >> >> in clear violation of Microsoft's recommendation .. >> >> > _hDesktop = OpenDesktop("Default", 0, false, >> > MAXIMUM_ALLOWED); >> >> Shouldn't this be "WinSta0\\Default"? > >No. Not according to the API documentation. > >Regardless, I got the function to call properly. I had a messed up >prototype; once I fixed that, there were no more errors. It's a moot >point because I have since learned that global hooks *are not >possible* in Windows services regardless of the service process' >desktop. I'd have to use GetAsyncKeyState (which also isn't guaranteed >to work) but that would require more CPU usage. I'd have to turn on >logon/logoff auditing and watch the security event log just to detect >when as user as logged on or off and that's a bit too much overhead. I would use RegNotifyChangeKeyValue on HKEY_USERS to wait for changes... >I'm shifting the paradigm to a user application or a driver. At the same time you should ensure your laws allow such monitoring... >So where does Microsoft say it's a bad idea to write services in C#? I don't think they say it directly.. but services are supposed to be optimized and efficient... ;) - Sten |