CFFI, the Common Foreign Function Interface, for Common Lisp. For Python CFFI, see the [python-cffi] tag.
CFFI, the Common Foreign Function Interface, purports to be a portable foreign function interface for Common Lisp.
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Questions tagged [cffi]
142 questions
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1 answer
Can I wrap OpenCV's C++ interface with C and then wrap that with Lisp's CFFI?
I was also wondering about the possibility of wrapping OpenCV's C++ interface in C and then wrapping that in Lisp so I could add all the C++ functionality as well to my cl-opencv wrapper because I would like to make it complete.... Also wondered if…
user2735131
0
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1 answer
cffi's foreign-alloc with list containing a defconstant
I'm trying to do:
(defconstant x 1)
(cffi:foreign-alloc :int :initial-contents '(x 99))
but I get an error message:
The value X is not of type (SIGNED-BYTE 32).
[Condition of type TYPE-ERROR]
It is very important that I can define this:
(x 99)…
user2735131
0
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1 answer
How do I find out in the OpenCV C Inerface,...In what .so a OpenCV function is defined
Like for example if I was trying to call cvNamedWindow....what .so would the cvNamedWindow information be in.....Please give me the info so I can track this info down myself for any C OpenCV function...I usually grep my opencv 2.4.6 folder which…
user2735131
-1
votes
1 answer
Encoding 'utf-16' is not consistent when convert lisp string from/to C string
I find when use 'utf-16' as the encoding to convert a lisp string to C string with cffi, the actual encoding used is 'utf-16le'. But, when convert C string back to lisp string, the actual encoding used is 'utf-16be'. Since I'm not familiar with…
xiepan
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1 answer
How do I mem-aref the output of a meta-object in CFFI
I have this function scalar which is a wrapper of the 2 function definitions commented above it.
My ? is how do I mem-aref the output of (scalar 1 2 3 4), which is #
I think # is called a Meta-Object
…
user3517736
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1 answer
Common Lisp: This is not a number NIL and &rest parameters
On this line ((pointerp (first args)) (mem-aref (%vector-float-to-c-array (first args)) :float (second args))) in the below code the (second args) compiles with the warning This is not a number NIL. The function works but how do I get rid of this…
user3517736
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2 answers
Clarification sought on validity and reason for "empty" C struct definition in Python CFFI definition file
I am reading some code, and came across this rather odd C struct definition:
typedef struct dataObject
{
...;
} DATA_OBJECT;
Can anyone explain (with references if possible):
If this is a valid struct definition.
What would be the…
Homunculus Reticulli
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