All Manuals > LispWorks Foreign Language Interface User Guide and Reference Manual > 4 Advanced Uses of the FLI > 4.6 Using DLLs within the LispWorks FLI > 4.6.1 Using C DLLs

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4.6.1.1 Testing whether a function is defined

Having loaded your DLLs (with register-module) you may wish to test whether certain functions are now available.

To detect when a C function name is defined, call

(not (fli:null-pointer-p
      (fli:make-pointer :symbol-name name

                        :errorp nil)))

LispWorks Foreign Language Interface User Guide and Reference Manual - 7 Dec 2011

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