Yes! Both of those solutions worked! Thanks!
- Patrick
On Monday, March 10, 2014 3:23:55 PM UTC-4, Ivar Nesje wrote:
>
> It seems to me like the error message is correct. The first argument to
> ccall must be constant, and it looks like you have a variable called `path`
> in your ccall.
>
> Can you try to declare path as const, or just put the library name/path as
> a string/symbol in the ccall expression.
>
> Ivar
>
>
> kl. 20:10:32 UTC+1 mandag 10. mars 2014 skrev Patrick Foley følgende:
>>
>> I have changed the function to now be
>> "extern double bessela1(double x) { "
>>
>> Everything still compiles nicely, but I get the same error.
>>
>> - Patrick
>>
>>
>> On Monday, March 10, 2014 2:45:12 PM UTC-4, Patrick Foley wrote:
>>>
>>> Hi All,
>>>
>>> I wrote some C code to compute a ratio of bessel functions, and am now
>>> trying to access it with Julia. I have compiled it into a shared library
>>> with
>>>
>>> "gcc -std=c99 -fPIC -shared -lm bessela1.c -o bessela1.so".
>>>
>>> This compiles without any errors or warnings, and the code works.
>>>
>>>
>>> I'm trying to use a function
>>> '''
>>>
>>> double bessela1(double x) {
>>>
>>> // lots of code.
>>>
>>> return y;
>>>
>>> }
>>> ''' defined within the bessela1.c file. All functions it needs are also
>>> in the .c file, and I don't use any other files.
>>>
>>> So in my Julia code, I have
>>>
>>> s = ccall( (:bessela1, path), Float64, (Float64, ), 0.5)
>>> and path is the path to the bessela1.so file.
>>>
>>> When I run this in julia, I get the following error:
>>>
>>> ERROR: type: anonymous: in ccall: first argument not a pointer or valid
>>> constant expression, expected DataType, got Type{(Any...,)}
>>>
>>> in anonymous at no file
>>>
>>>
>>> I believe that the C code is compiling correctly (I know it works in C),
>>> and I can run dlopen() on the .so file and get a pointer back, but I'm not
>>> sure what to do with that.
>>>
>>> Can anyone point out what I'm doing incorrectly? I've also tried using
>>> "bessela1" rather than :bessela1, but get the same error.
>>>
>>> Thanks,
>>> Patrick
>>>
>>
