<< to AfxMessageBox / cout

My program can be run from the command line or using an MFC GUI.  During calculation, I would like error messages to be directed either to cout or popped up in a MessageBox, depending on how the user is running it.  How best to do this?

My current plan is to set a flag on startup, and check it every time there is output, something like:

void ShowErrorMessage(std::string msg)
{
 if flag
   std::cout << msg;
 else
   MessageBox(msg);
}

This feels wrong - rather than
ShowErrorMessage("my message");
I'd like to be doing
errOutput << "My message";

Is this a better way?  How would I best implement it?  Although at the moment, the program will only run on Windows, I'd like to make the code as platform independent as possible.
LVL 4
IainHereAsked:
Who is Participating?
 
jkrCommented:
class CErrOutput {

public:
 enum AppType {
 GUI,
 CONSOLE
 };
 CErrOutput ( AppType type) { m_appType = type};
 virtual ~CErrOutput () {};

 void operator << ( const std::string& msg);

private:
 AppType m_appType;
};

void
CErrOutput::operator << ( const std::string& msg) {

// pseudocode from here :o)
if ( m_appType != GUI)
  std::cout << msg;
else
  MessageBox(msg);

}
0
 
IainHereAuthor Commented:
No wonder you made 10e6 points - concise and correct.

Thanks a million :-)
0
 
jkrCommented:
Thanks :o)
0
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