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Editorial Team
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Asked: 2026-05-27T14:25:25+00:00

I have a C++ dll I have written (native, not .net), and I would

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I have a C++ dll I have written (native, not .net), and I would like to use its functionality from Visual Lisp. Can anyone point me to an example of how to do this, or at least which bit of documentation to read?

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  1. Editorial Team

    I solved this by writing an activex/COM wrapper for my dll, which I think should make it easier to link to in future. Starting a thread on the swamp yielded some answers from nice people about how to call COM from Visual Lisp. For the record, it looks something like this:

    //in c++... (header and IDL file also needed)
hresult timestwo(double in,double* out)
{
  *out = in*2;
  return S_OK;
}

;; in Lisp...
(vl-load-com)
(setq myinstance (vlax-create-object "mycomwrapperdll.mycomwrapperclass"))
(setq num 12.34)
(vlax-invoke-method myinstance 'timestwo num 'newnum)
(vlax-release-object myinstance)
;; newnum now contains 24.68
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