Correct way to end a custom program ...

[drnicolas]

Hi!

I am fighting with problems in a VB-Porgram.

At first i use the return code of FSUIPC_Open and the dwresult to start the communication with FS2004.

This works and the communication starts quite early (at the point the blue window to choose a flight appears).

Now the program reads timer-controlled many values from the FS using FSUIPC_Read.

The result for the first FSUIPC_Read is used to test for a succssful read.

Nevertheless my program locks up whenever the FS becomes "unavailable".

Is there a safe way to test for successful contact with FS ?

[Pete Dowson]

Nevertheless my program locks up whenever the FS becomes "unavailable".

It shouldn't "lock up" -- the SendMessageTimeout used in the code you call has a timeout 9that is why it is used). There may be several retries too, but it would probably do, say, 10 retries with a timeout of 2 seconds, so in the worst case take 20 seconds.

I don't know the VB stuff, but this would be typical -- take a look. All the source is supplied, so there's really nothing hidden here, no mystery.

Is there a safe way to test for successful contact with FS ?

If FS crashes or hangs the problem is usually thatnothing happens. Hence the time-out on the only part of your code which communicates with the FS process -- the SendMessageTimeout. How your program is hanging I don't know, but you should be able to find out by debugging.

Regards,

Pete