[cffi-devel] wrapping opencv's cvError

[Chris Bagley]

Couple of things:
* Is there any reason you are not using the open-cv library that exists for
common lisp? https://github.com/ryepup/cl-opencv. It is 3 years old but
reading the code may help you work out some of the answers.
* What is the error message in *inferior-lisp*? Normally unless you have
manged to corrupt the lisp image somewhere (which you can do with cffi, I
certainly have plenty of times) an error in the foreign function shouldnt
crash lisp.
Looking forward to the error message!


On 15 October 2013 23:16, Joeish W <joeish80829 at yahoo.com> wrote:

> I wrapped  opencv's cvError like this
>
>
>
> ;;  void cvError(int status, const char* func_name, const char* err_msg,
> const char* file_name, int line)
> (cffi:defcfun ("cvError" cv-error) :void
>   (status :int)
>   (func-name :string)
>   (err-msg :string)
>   (file-name :string)
>   (line :int))
>
> but the whole purpose of the function is to cause an error in c which it
> does perfectly when i run this at the repl
>
> (cv-error +stsoutofrange+ "SCALAR" "error"
> "/home/w/Documents/opencv-2.4.6.1/modules/calib3d/src/epnp.cpp" 1)
>
> here is the error
>
> OpenCV Error: One of arguments' values is out of range (bew!) in SCALAR,
> file /home/w/Documents/opencv-2.4.6.1/modules/calib3d/src/epnp.cpp, line 1
> terminate called after throwing an instance of 'cv::Exception'
>
>
> but the thing is it causes the error in c on the inferior-lisp buffer in
> emacs  on the repl buffer the repl just hangs....how would i go about
> getting this error(above) to show up on the lisp side
>
>
>
>
>
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