I have a project that use CORBA/ACE for connection between two distributed module and when I transfered my solution from MSVS2008 to MSVS2015 I faced with access violation error in every use of ACE_DEBUG function for write logs of project and when I followed code I find that the null pointer error is before this part of code:
if (tracing)
this->start_tracing ();
this is in Log_Msg.cpp that is a file of ace library. Here is the fuction that error generates in it:
ssize_t
ACE_Log_Msg::log (ACE_Log_Record &log_record,
int suppress_stderr)
{
ssize_t result = 0;
// Format the message and print it to stderr and/or ship it off to
// the log_client daemon, and/or print it to the ostream. Of
// course, only print the message if "SILENT" mode is disabled.
if (ACE_BIT_DISABLED (ACE_Log_Msg::flags_,
ACE_Log_Msg::SILENT))
{
bool tracing = this->tracing_enabled ();
this->stop_tracing ();
#if !defined (ACE_WIN32)
// Make this block signal-safe.
ACE_Log_Msg_Sig_Guard sb;
#endif /* !ACE_WIN32 */
// Do the callback, if needed, before acquiring the lock
// to avoid holding the lock during the callback so we don't
// have deadlock if the callback uses the logger.
if (ACE_BIT_ENABLED (ACE_Log_Msg::flags_,
ACE_Log_Msg::MSG_CALLBACK)
&& this->msg_callback () != 0)
this->msg_callback ()->log (log_record);
// Make sure that the lock is held during all this.
ACE_MT (ACE_GUARD_RETURN (ACE_Recursive_Thread_Mutex, ace_mon,
*ACE_Log_Msg_Manager::get_lock (),
-1));
if (ACE_BIT_ENABLED (ACE_Log_Msg::flags_,
ACE_Log_Msg::STDERR)
&& !suppress_stderr) // This is taken care of by our caller.
log_record.print (ACE_Log_Msg::local_host_,
ACE_Log_Msg::flags_,
stderr);
if (ACE_BIT_ENABLED (ACE_Log_Msg::flags_, ACE_Log_Msg::CUSTOM) ||
ACE_BIT_ENABLED (ACE_Log_Msg::flags_, ACE_Log_Msg::SYSLOG) ||
ACE_BIT_ENABLED (ACE_Log_Msg::flags_, ACE_Log_Msg::LOGGER))
{
// Be sure that there is a message_queue_, with multiple threads.
ACE_MT (ACE_Log_Msg_Manager::init_backend ());
}
if (ACE_BIT_ENABLED (ACE_Log_Msg::flags_, ACE_Log_Msg::LOGGER) ||
ACE_BIT_ENABLED (ACE_Log_Msg::flags_, ACE_Log_Msg::SYSLOG))
{
result =
ACE_Log_Msg_Manager::log_backend_->log (log_record);
}
if (ACE_BIT_ENABLED (ACE_Log_Msg::flags_, ACE_Log_Msg::CUSTOM) &&
ACE_Log_Msg_Manager::custom_backend_ != 0)
{
result =
ACE_Log_Msg_Manager::custom_backend_->log (log_record);
}
// This must come last, after the other two print operations
// (see the <ACE_Log_Record::print> method for details).
if (ACE_BIT_ENABLED (ACE_Log_Msg::flags_,
ACE_Log_Msg::OSTREAM)
&& this->msg_ostream () != 0)
log_record.print (ACE_Log_Msg::local_host_,
ACE_Log_Msg::flags_,
#if defined (ACE_LACKS_IOSTREAM_TOTALLY)
static_cast<FILE *> (this->msg_ostream ())
#else /* ! ACE_LACKS_IOSTREAM_TOTALLY */
*this->msg_ostream ()
#endif /* ! ACE_LACKS_IOSTREAM_TOTALLY */
);
if (tracing)
this->start_tracing ();
}
return result;
}
I used __try/__except and other exception handlers but I can't solve it. I don't have such error in MSVS2008. maybe I should set some setting or add new file but I don't know what it is.
Please help me :(
You explicitly have to initialize the ACE library. When you have a regular main() we have some macros doing that. Probably you have some special main, try to call ACE::init();
at the start of that and ACE::fini();
at the end. See ACE_wrappers/tests/ACE_Init_Test.cpp
.
Also you have to compile ACE/TAO with the Visual Studio 2015 compiler. Maybe upgrade directly to Visual Studio 2017, that compiler is supported by ACE/TAO 6.4.3/2.4.3.