This OpenMaple function is part of the MCallBackVector structure passed as an argument to StartMaple.

The textCallBack function is called with typical (non-exceptional) Maple output. The output that Maple generates, for example, an intermediate result or the output from a printf statement, is passed to the textCallBack function.

The prototype for the function you can assign to the entry in the MCallBackVector must look like the following.

The tag parameter indicates the type of Maple output. The tag parameter can take one of the following values (as defined in maplec.h).

The output parameter contains the output of the type indicated by the tag parameter. Each output string can be arbitrarily long.  Most output obeys interface(screenwidth), which is initially set to infinity.  Some output is not line-broken, including output generated by printf (which control its own formatting).

A single result may be split into multiple calls to the textCallBack function. In particular, this can happen when  is not infinity.  It is also true for formatted output like that generated by accessing help.  A single command can generate many calls with different output tags.

The data parameter contains the same data as passed to StartMaple in the user_data parameter.

Source code for a textCallBack example is provided in the samples/OpenMaple/HelpExamples subdirectory of your Maple installation.