Socket Programming with C-Mex

Hello,

I'm in need of setting up a TCP/IP connection to a Simulink simulation (which will employ a demodulator). I am using RTW (Simulink Coder) to output C Code and an exe for the demod.

I need to send the data to the generated executable via TCP/IP. I'm currently looking to accomplish this via sockets through a C-Mex implementation with an S-function block.

I have C++ server and client code that compiles (and runs via cmd line - Windows XP 32 bit) but crashes MATLAB upon execution.

Any thoughts as to what may be causing the crashing or better ways to implement this architecture would be greatly appreciated.

Thanks,

Jason

[Jason]

More details:

The code is here:

http://msdn.microsoft.com/en-us/library/ms737593%28v=vs.85%29.aspx

http://msdn.microsoft.com/en-us/library/ms737591%28v=vs.85%29.aspx

After a successful compile with Mex I run the server and get:

------------------------------------------------------------------------

Segmentation violation detected at Mon Sep 12 15:34:23 2011

------------------------------------------------------------------------

Configuration:

MATLAB Version: 7.11.0.584 (R2010b)

MATLAB License: 115723

Operating System: Microsoft Windows XP

Window System: Version 5.1 (Build 2600: Service Pack 3)

Processor ID: x86 Family 6 Model 10 Stepping 7, GenuineIntel

Virtual Machine: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode

Default Encoding: windows-1252

Fault Count: 3

Abnormal termination:

Register State (from fault):

EAX = 00000000 EBX = 00000000

ECX = 1d6f7250 EDX = 00000000

ESP = 00c2e71c EBP = 00c2e71c

ESI = 00c2ee3c EDI = 1d225d70

EIP = 7bce1d76 EFL = 00010297

CS = 0000001b DS = 00000023 SS = 00000023

ES = 00000023 FS = 0000003b GS = 00000000

...

Answer 1

[Ed Laurence]

Hi Jason,

Did you get anywhere with this problem? I've been trying to get something similar working where I've embedded C code for a WinSock client in a level 2 S-function but as soon as I run the simulation Simulink hangs. I've tried debugging by attaching the MEX file to VS 2008 and have found some errors relating to invalid parameters passed to the C function but haven't managed to solve it yet.

Cheers,

Ed

Answer 2

[Silmara da Silva Palmieri]

Hi Ed,

Did you get any answer regarding this problem? I am facing the same issue and have no clue how to check where is my problem.

Thank you!

Regards,

Silmara