handle error output in OpenMaple - Maple Help

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errorCallBack - handle error output in OpenMaple

Calling Sequence

errorCallBack(data, offset, msg)




user_data pointer passed to StartMaple (void*)






error message (char*)



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


The errorCallBack function is called when an error occurs during parsing or processing.


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

void M_DECL errorCallBack( void *data, M_INT offset, char *msg );


The offset parameter indicates the location of a parsing error. If offset >= 0, the error was detected at the specified offset in the string passed to EvalMapleStatement. If offset < 0, the error is not a parsing error; it is a computation error.


The msg parameter contains the text of the error message.


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


If an errorCallBack function is not specified, error messages are sent to the textCallBack function, with the MAPLE_TEXT_ERROR tag.


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

See Also

callBackCallBack, CustomWrapper, OpenMaple, OpenMaple/C/API, OpenMaple/C/Examples, queryInterrupt, readLineCallBack, redirectCallBack, StartMaple, statusCallBack, streamCallBack, textCallBack

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