How to pass a C array to foreign callable?

Hi there,

I am trying to pass an array of long signed ints from a dll to Lisp in  
order to have that filled. The callable looks like this:

(fli:define-foreign-callable ("FillBufferLisp" :result-type :void)
     ((buflen :int)
      (arr (:c-array (:signed :long))))
   (populate-farray buflen arr))

where buflen is the length of the array, and populate-farray populates the  
foreign array with data. The code is called from C like this:

(*fbl)(buflen, arr);

where *fbl is the pointer to the foreign callable and it appears to call  
lisp code just fine. However what happens when the callable is called is  
this error:

Error: The subscript 0 exceeds the limit -1 for the first dimension of the  
foreign-array #<Foreign-Array (:SIGNED :LONG) (0): addr #x04CB0020>.

It seems to me that the function expects the length of the array to be  
specified in the call (or definition?), but I cannot figure out how to do  
that. Or maybe it is something else. Any suggestions will be quite welcome.

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How to pass a C array to foreign callable?

Re: How to pass a C array to foreign callable?