Hey Randy,
Any update on the liboath wrapping? I'd be willing to help if you've
started as I need the functionality. Want to throw up what you have in a
repo and collaborate?
-Jacob
On Monday, September 1, 2014 6:10:49 PM UTC-4, Randy Zwitch wrote:
>
> Kevin, adding const in front gave me this error:
>
> type: ccall: expected Symbol, got Ptr{None}
>
> while loading In[3], in expression starting on line 3
>
> Luckily João, your code finally worked for me! So if I understand this
> correctly, the problem was that we were originally passing a Ptr to ccall,
> when all I should've been doing is passing a string declared as a constant?
>
>
>
> On Monday, September 1, 2014 4:46:07 PM UTC-4, João Felipe Santos wrote:
>>
>> I'm sorry, there was a mistake in my example. The dlopen step should be
>> used just to check whether the file is accessible as a shared library.
>> ccall expects the full path to the .dylib file in case the library is not
>> at a "standard" location.
>>
>> Do something like this instead:
>>
>> const liboauth = "/path/to/liboauth"
>> (dlopen_e(liboauth) == C_NULL) && error("Unable to load shared
>> library at the given path.")
>> b64d = ccall((:oauth_sign_hmac_sha1, liboauth), Ptr{Uint8},
>> (Ptr{Uint8}, Ptr{Uint8}), testurl, testkey)
>> println(bytestring(b64d))
>>
>> Note that you have to use bytestring and not string. string will create a
>> string from printing the pointer (which will show something like Ptr{Uint8}
>> @0x0000012345). bytestring converts a C string from a pointer to an
>> ASCIIString, which is what you want.
>>
>> --
>> João Felipe Santos
>>
>>
>> On Mon, Sep 1, 2014 at 4:24 PM, Randy Zwitch <[email protected]>
>> wrote:
>>
>>> Thanks for the suggestions everyone. Unfortunately, neither the code
>>> from Ivar nor João worked for me.
>>>
>>> liboauth = dlopen("/usr/local/lib/liboauth.dylib")
>>>
>>> Out[8]:
>>>
>>> Ptr{Void} @0x00007fdc665c5ca0
>>>
>>> In [9]:
>>>
>>
> function oauth_sign_hmac_sha1(m::String,k::String)
>>>
>>> res =
>>> ccall((:oauth_sign_hmac_sha1,liboauth),Ptr{Uint8},(Ptr{Uint8},Ptr{Uint8}),m,k)
>>>
>>> if res == C_NULL
>>>
>>> error("oauth_sign_hmac_sha1 failed")
>>>
>>> end
>>>
>>> return string(res)
>>>
>>> end
>>>
>>>
>>>
>>> testurl =
>>> "GET&http%3A%2F%2Fphotos.example.net%2Fphotos&file%3Dvacation.jpg%26oauth_consumer_key%3Ddpf43f3p2l4k3l03%26oauth_nonce%3Dkllo9940pd9333jh%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1191242096%26oauth_token%3Dnnch734d00sl2jdk%26oauth_version%3D1.0%26size%3Doriginal"
>>>
>>> testkey = "kd94hf93k423kf44&pfkkdhi9sl3r4s00"
>>>
>>> oauth_sign_hmac_sha1(testurl, testkey)
>>>
>>> type: oauth_sign_hmac_sha1: in ccall: first argument not a pointer or
>>> valid constant expression, expected DataType, got Type{(Any...,)}
>>> while loading In[9], in expression starting on line 11
>>>
>>> in oauth_sign_hmac_sha1 at In[9]:2
>>>
>>>
>>>
>>>
>>> testurl =
>>> "GET&http%3A%2F%2Fphotos.example.net%2Fphotos&file%3Dvacation.jpg%26oauth_consumer_key%3Ddpf43f3p2l4k3l03%26oauth_nonce%3Dkllo9940pd9333jh%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1191242096%26oauth_token%3Dnnch734d00sl2jdk%26oauth_version%3D1.0%26size%3Doriginal"
>>>
>>> testkey = "kd94hf93k423kf44&pfkkdhi9sl3r4s00"
>>>
>>> b64d = ccall((:oauth_sign_hmac_sha1, liboauth), Ptr{Uint8}, (Ptr{Uint8},
>>> Ptr{Uint8}), testurl, testkey)
>>>
>>> bytestring(b64d)
>>>
>>> type: anonymous: in ccall: first argument not a pointer or valid constant
>>> expression, expected DataType, got Type{(Any...,)}
>>> while loading In[10], in expression starting on line 3
>>>
>>> in anonymous at no file
>>>
>>>
>>> Does this mean I compiled the library wrong? When I did the 'make' step,
>>> after it was complete, I did 'make installcheck' and the 3 tests reported
>>> that they completed successfully.
>>>
>>> At a higher level, I like Isaiah's suggestion of doing this process by
>>> hand to really get to understanding what is going on. Is there an eaier
>>> external library that one of you could suggest that I could use to walk
>>> through the entire process? I've done the examples in the manual using
>>> :clock and :getenv and understand what is going on, so now I want to work
>>> with a user-installed library to make sure I really get the process. I
>>> started with OAuth to see if I could make something usable to work with my
>>> Twitter package, but maybe it's not the best starting place.
>>>
>>>
>>> On Monday, September 1, 2014 10:47:22 AM UTC-4, João Felipe Santos wrote:
>>>
>>>> You need to do ccalls using Ptr{Uint8}. What you can do actually is
>>>> wrap the Clang.jl-generated functions with your own functions with an
>>>> alternative signature, and then convert from ASCIIString to Ptr{Uint8}.
>>>> Note that you probably will need to do it anyways to wrap the return
>>>> types,
>>>> since you probably do not want to work with pointers from Julia :)
>>>>
>>>> In that specific example, if m and k are ASCIIStrings, conversions will
>>>> be done automatically:
>>>>
>>>> testurl = "GET&http%3A%2F%2Fphotos.example.net%2Fphotos&file%
>>>> 3Dvacation.jpg%26oauth_consumer_key%3Ddpf43f3p2l4k3l03%26oauth_
>>>> nonce%3Dkllo9940pd9333jh%26oauth_signature_method%
>>>> 3DHMAC-SHA1%26oauth_timestamp%3D1191242096%26oauth_token%
>>>> 3Dnnch734d00sl2jdk%26oauth_version%3D1.0%26size%3Doriginal"
>>>> testkey = "kd94hf93k423kf44&pfkkdhi9sl3r4s00"
>>>> b64d = ccall((:oauth_sign_hmac_sha1, liboauth), Ptr{Uint8},
>>>> (Ptr{Uint8}, Ptr{Uint8}), testurl, testkey)
>>>>
>>>> Note that b64d here will be a Ptr{Uint8}, which you can convert to a
>>>> Julia string by using bytestring(b64d).
>>>>
>>>> --
>>>> João Felipe Santos
>>>>
>>>>
>>>>
