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FilledSmallSquarelong MLError(MLINK link) returns a constant identifying the last error to occur on link, or 0 if none has occurred since the previous call to MLClearError().

FilledSmallSquare You can get a textual description of errors by calling MLErrorMessage().

FilledSmallSquare Constants corresponding to standard MathLink errors are defined in mathlink.h.

FilledSmallSquare See The Mathematica Book: Section 2.12.13.