X-Plane Crashes When Sending Large Int Array

[ssokol]

I've run across a case where sending a valid dataref set string to ExpPlane causes X-Plane to crash. My app uses a combination of ExtPlane and UDP. I'm attempting to use the sim/network/dataout/data_to_internet dataref to enable various UDP outputs when my server starts up. However, sending a string with 200 int values (which is what that dataref appears to require) causes a crash.

I'm able to subscribe to the dataref, and ExpPlane sends back a response string that accurately reflects the values set on the General Data Output tab of the Data Output settings page:

uia sim/network/dataout/data_to_internet [0,0,0,1,1,1,1,0,0,0,0,1,0,0,1,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,1,0,1,0,1,1,1,1,1,0,1,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,128,187,90,64,75,2,0,0,184,187,90,64,75,2,0,0,204,187,90,64,75,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

But when I send a set request with exactly the same set of values, X-Plane dies:

xmitExtPlaneCommand("set sim/network/dataout/data_to_internet [0,0,0,1,1,1,1,0,0,0,0,1,0,0,1,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,1,0,1,0,1,1,1,1,1,0,1,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,208,107,232,22,236,1,0,0,8,108,232,22,236,1,0,0,28,108,232,22,236,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]\r\n")

(Note: carriage returns have been added for clarity. When sent the value is sent as one long string with no breaks.)

The odd thing about this: X-Plane 11 shows a total of 136 outputs (0 - 135). The array hold 200 integer values, and as you can see there are some values in there at indexes greater than 135. I simply sent back the values that I received - perhaps that's an issue?

Anyone have any ideas?

[vranki]

Can you run X-Plane in debugger to see where it crashes?

[ssokol]

Sure. Is that simply a matter of running it from the command prompt, or is there some kind of flag I need to set / argument I need to use?

(Apologies for the noob question.)

[vranki]

At least on Linux you just can run gdb ./X-Plane_x86-64 , crash it and use bt to show backtrace.