Yes I do want to collaborate Jacob, because I probably need some of the
functionality too! I'll put it up when I get home tonight and add you to
the repo.
On Tuesday, September 9, 2014 8:32:41 AM UTC-4, Jacob Quinn wrote:
>
> 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
>>>>>
>>>>>
>>>>>
