MATLAB COMPILER RELEASE NOTES User's Guide download pdf (Page 160)

5 Controlling Code Generation

5-44

Print Handlers

A print handler i s a routine that controls how your application displays the

output generated by calls to

mlf routines.

The system p rovides a default print handler for your application. The d efault

print handler writes output to the standard output stream. If this print

handler is suitable for your application, you do not need to write and register

another print handler.

However, you can override the default behavior by writing and registering an

alternative print handler. In fact, if you are coding a s tand-alone app lication

with a GUI, then youmustregister anotherprinthandlertodisplay application

output inside a GUI mechanism, such as a Windows message box or a Motif

Label widget.

You write an alternative print handler routine in C or C++ and register its

name at the beginning of your stand-alone application.

The way you register a print handler depends on whether or not “the

main

routine” (or first routine called) for your application is written in C or in M.

Note The print handlers and registration functions discussed in this section

are written for C applications. Although they will work in C++ applications,

we recommend that you use a C++ print handler and the C++ registration

routine

mwSetPrintHandler() for C++ applications. See the MATLAB C++

Math Library User’s Guide for details about C++ print handlers.

Main Routine Written in C

If your main routine is coded in C (as opposed to being written as an M-file),

you must:

•Register a print handler in your main routine.

•Write the print handler.

This section references source code from a sample stand-alone application

written for Microsoft Windows. The main routine

WinMain iswritteninC.The

source code illustrates how to register and write a print handler.

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MATLAB COMPILER RELEASE NOTES User's Guide Page 160