Just single instance of my app.

[DerekSaw]

Hi there, how do I have my application just to run single instance of it. er....eg. Restore the previous instance of the app and then exits.

[Atlantys]

When the app starts up, do a check for a mutex. if it doesn't exist create one, and if not then find the existing app and restore it.. something like: CString strMutexName = _T("MyApp"); // can also use a GUID here if (!m_hMutex) { m_hMutex = CreateMutex(NULL, FALSE, strMutexName); } else { /* go through all the current windows and restore the existing version of your app. i can't remember how to do this now.. something to do with EnumWindow i'm sure, just don't use FindWindow (heard bad things about it :~ ). */ } hope this helps.:)

[Nish Nishant]

DerekSaw wrote: Hi there, how do I have my application just to run single instance of it. er....eg. Restore the previous instance of the app and then exits. Avoiding Multiple Instances of an Application

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Author of the romantic comedy Summer Love and Some more Cricket [New Win] Review by Shog9 Click here for review[NW]

[Neville Franks]

Look at CSingleInstance in http://www.codeproject.com/library/pj.asp and the other related articles in the "Threads Processes & IPC" section. Neville Franks, Author of ED for Windows. www.getsoft.com

[Scott H Settlemier]

sometimes its nice to pass off the command line from the second instance to the first. I usually do this with a control struct in shared memory. First instance creates the control struct and records its information there. Other instances, read the control struct and record their command line there, then activate the first instance, and notify it that their command line has been recorded before exiting. The first instance handles these as appropriate, perhaps opening another file, etc.

[Lost User]

Using mutex is one way to do so, see MSKB: Q243953