Handling Errors

Essential Networking Module User's Guide
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4.3 Handling Errors

Example 1 does not handle errors. Example 2 is an improved version that detects errors and prints a message.

This section assumes that you understand C++ exceptions.

Example 2: Handling errors

#include <rw/rstream.h>
#include <rw/network/RWSocketPortal.h>
#include <rw/network/RWInetAddr.h>
#include <rw/network/RWWinSockInfo.h>

int main()
{
  RWWinSockInfo info;
  try {                                                        //1
    RWSocketPortal p( RWInetAddr(3010,"net.roguewave.com") );
    p.sendAtLeast("Hello out there!");
  }
  catch (const RWxmsg& x) {                                    //2
    cerr << "Problem! " << x.why() << endl;                    //3
  }
  return 0;
}

`//1`	Encloses the main part of the example in a `try` block. If an exception is thrown from within the `try` block, the program exits the scope of the `try` block and looks for a `catch` clause to handle the exception.
`//2`	Catches all Networking package and SourcePro Core exceptions that can be thrown from within the `try` block (all Rogue Wave exceptions are derived from *RWxmsg). For more information, see the Essential Tools Module User's Guide*.
`//3`	Handles the exception by printing an error message. The member function `why()` is part of the *RWxmsg* class interface and is available for any exception that the Networking package might throw.

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