Visual Lisp：如何调用外部C ++ DLL中的函数 [英] Visual Lisp: how to call functions in external C++ DLL

问题描述

我有一个C ++ dll我写了（本机，不是.net），我想使用其功能从Visual Lisp。任何人都可以给我一个例子，如何做到这一点，或至少哪些位的文档读？

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?

推荐答案

这通过写一个activex / COM包装为我的dll，我认为应该使它更容易链接到未来。在沼泽上启动会话，从好人那里了解如何调用COM的一些答案视觉Lisp。对于记录，它看起来像这样：

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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