syslog const char* to string

   catch (exception e) { syslog (LOG_ERR, "exception: " + e.what());    }

Here is what im tryin开发者_JAVA百科g to do, And it aint working, ive tried using this

string ctos(const char& c){

    stringstream s;
    s << c;

    return s.str();
}

But still lost

Any help would be apreciated Thanks.

Try this

catch (exception e) 
{ 
         syslog (LOG_ERR, "exception: %s" ,e.what());   
}

Use the std::string constructor taking const char*, see reference. So your logging code can be corrected as follows:

catch (const exception& e) {
    syslog (LOG_ERR, (std::string("exception: ") + e.what()).c_str());
}

If you are using syslog(3) then it is defined as:

void syslog(int priority, const char *message, ...);

Either you want to use printf-like functionality of syslog:

catch (const std::exception& e) 
{ 
    syslog(LOG_ERR, "exception: %s", e.what());
}

Or you can convert the std::string to const char*, using the std::string::c_str member function:

catch (const std::exception& e)
{
    std::string message = std::string("exception: ") + e.what();
    syslog(LOG_ERR, message.c_str());
}

Another note, catch by const-reference, else it is a good chance that the actual thrown exception object gets sliced.