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errorCallBack - handle error output in OpenMaple
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Calling Sequence
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errorCallBack(data, offset, msg)
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Parameters
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data
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user_data pointer passed to StartMaple (Long)
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offset
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integer
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msg
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error message (byte array pointer)
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Description
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The errorCallBack function is called when an error occurs during parsing or processing.
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The prototype for the function you can assign to the entry in the MapleCallBack must look like the following.
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Sub ErrorCallBack(ByVal data As Long,
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ByVal Offset As Integer,
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ByVal Output As Long)
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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.
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The msg parameter contains the text of the error message.
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The data parameter contains the same data as passed to StartMaple in the user_data parameter.
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If an errorCallBack function is not specified, error messages are sent to the textCallBack function, with the MAPLE_TEXT_ERROR tag.
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Examples
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Public Sub ErrorCallBack(ByVal data As Long, _
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ByVal Offset As Integer, ByVal Output As Long)
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MsgBox " at offset " + str(Offset) + " " + _
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MaplePointerToString(Output), vbInformation, ""
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End Sub
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' assignment to MapleCallback entry
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cb.lpErrorCallBack = GetProc(AddressOf ErrorCallBack)
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' test statement that will invoke the ErrorCallBack
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EvalMapleStatement kv, "error(""invalid argument: %1"",x+y);"
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See Also
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callBackCallBack, OpenMaple, OpenMaple/VB/API, OpenMaple/VB/Examples, queryInterrupt, readLineCallBack, redirectCallBack, StartMaple, statusCallBack, streamCallBack, textCallBack
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Download Help Document
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