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FSUIPCConnect error #12 only with FS2004!


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I'm sure there may be an obvious answer, but I can't find it <sigh>

Developing an ACARS application for BAVirtual, I have only one real problem.

FSUIPCConnection.Open() works without issue for all flavors of FSX, P3Dv3/4 and X-Plane 10/11, the only sim that refuses the connection is FS2004.

This is vb.net/Visual Studio, using the latest client DLL (3.1.5).

FS2004 reported by several beta testers AND on my own installation, using FSUIPC 3.991 returns an exception and the ex.message "Error #12: FSUIPC_ERR_SENDMSG. Error sending message to FSUIPC."

            ' Attempt to open a connection to FSUIPC (running on any version of Flight Sim)
        Catch ex As Exception
            If DebugingOn And mainfrm.debugRepeatCount < 10 Then
                WriteDebugEntry("", "FSUIPCConnect", ex.Message)
                mainfrm.debugRepeatCount += 1
            End If
        End Try

Suggestions? I'm certainly doing something wrong, just don't know what it is :(

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I think on Windows 10 you need to run FS2004 'as administrator' to get it to run. If that's the case then your ACARS program (or Visual Studio if you are developing/debugging) must also run 'as administrator' or they won't be able to communicate.

If that's not the problem here, let me know and I'll see if I can find my FS9 discs.


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 Thanks for the quick reply. I'm actually on Win7 with my test version, but I'll try running both as admin, and one of the users (who is very savvy and can be relied on to provide accurate info) is on Win10 but said he always runs FS9 as admin and also ran my ACARS as admin too.

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  Thanks and I'm sorry I put you too that work. Since you confirmed it actually works, I re-checked the code (I've inherited it), turns out the Connect was wrapped in a "Try" that included updating some FSUIPC setting, AND it was throwing an arithmetic exception since the batterymaster offset was declared as 8-bytes instead of 4. Interestingly FS2004 seems to be the only sim where adjacent bytes result in a huge number which throws an exception being moved into a long!

Onward and upward, I'm hoping to master this but grateful for the support on the forum here, especially your timely and so very helpful assistance.




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