[AGENT++] Using agent++ with multithreading in a MFC application

[Florica Moldoveanu]

Hello

 

I tried to build a manager-agent pair of applications using MFC ( with
Microsoft Visual Studio 2005)and snmp++ v3.2 - agent++ v3.5. I included 

 

#define _NO_SNMPv3

#define _NO_LOGGING

 

in both agent++.h and config_snmp_pp.h. 

 

The best place (and the only normal one) to put the receive() call in an MFC
application is the OnIdle() overriden function. So, I included it in the
following way:

 

 

BOOL CagentApp::OnIdle(long lCount)

{

      BOOL bMore = CWinApp::OnIdle(lCount);

 

      Request * req=reqList->receive(0);

      if (req) 

              mib->process_request(req); // process the request

      return true;

}

 

The manager application send a get() request. The agent crashes to
threadPool->execute(mt) with the error: Unhandled exception at 0x10029503
(agent_pp.dll) in agent.exe: 0xC0000005: Access violation reading location
0x00000000.

 

 

void Mib::process_request(Request* req)

{

#ifdef _THREADS

      MibMethodCall* call = new MibMethodCall(this, 

                                &Mib::do_process_request, req);

#ifdef AGENTPP_USE_THREAD_POOL

      MibTask* mt = new MibTask(call);

------>>>    threadPool->execute(mt);

#else

#ifdef _WIN32THREADS

 

 

If I compile snmp++ and agent++ with 

 

#define _NO_THREADS

 

then the two programs work properly. The problem is that in this way I
cannot use the asychronous functions in the manager application and probably
cannot receive traps or informs.

 

 

 

I tried also to include the receive() call in a callback Timer function. The
agent crashes in the same point but without an error message!

 

 

Al the projects and libraries were built with the same setting:

SNMP_PP_NATIVE_EXPORTS

AGENT_PP_NATIVE_EXPORTS

 

Multi-threaded DLL (/MD).

 

 

Can you help me with an advise?? Is this problem already known?? I had a
look on the AgetPP archives but I didn't find an answer.

 

Thank you in advance,

 

Professor Florica Moldoveanu