[pHash-support] Java usage of pHash.java

Evan Klinger eklinger at phash.org
Wed Jan 13 12:39:34 PST 2010 

Looks like there are 2 more that need to be changed that aren't
static, ph_compare_images and ph_image_digest. The ones that take a
CImg parameter, prepend them with _
I think that might solve this once and for all.

On Wed, Jan 13, 2010 at 12:24 PM, Sebastian Gallese
<sebastiangallese at gmail.com> wrote:
> I searched for "static" and placed an underscore in front of each function.
>
> Looks like overloading is the issue with the error below.  Anything I should do?
>
> Attached is my pHash.h file.
>
> In file included from pHash.cpp:25:
> pHash.h:263: error: declaration of C function ‘int
> ph_image_digest(const char*, double, double, Digest&, int)’ conflicts
> with
> pHash.h:253: error: previous declaration ‘int ph_image_digest(const
> cimg_library::CImg<unsigned char>&, double, double, Digest&, int)’
> here
> In file included from pHash.cpp:25:
> pHash.h:288: error: declaration of C function ‘int
> ph_compare_images(const char*, const char*, double&, double, double,
> int, double)’ conflicts with
> pHash.h:276: error: previous declaration ‘int ph_compare_images(const
> cimg_library::CImg<unsigned char>&, const cimg_library::CImg<unsigned
> char>&, double&, double, double, int, double)’ here
> make[2]: *** [pHash.lo] Error 1
> make[2]: Leaving directory `/home/kdge/pHash-0.7.2/src'
> make[1]: *** [all-recursive] Error 1
> make[1]: Leaving directory `/home/kdge/pHash-0.7.2'
> make: *** [all] Error 2
>
> Thanks,
> Seb
>
>
>
> On Tue, Jan 12, 2010 at 6:31 PM, Evan Klinger <eklinger at phash.org> wrote:
>> Yeah it looks like I didn't rename them all. For the static functions,
>> try prepending an _ to the function name to get rid of these errors.
>> This weekend I will have more time to resolve all these issues so you
>> can move forward rather than debugging.
>>
>> On Tue, Jan 12, 2010 at 2:10 PM, Sebastian Gallese
>> <sebastiangallese at gmail.com> wrote:
>>> Evan,
>>>
>>> Thanks for sending me the updated pHash.h file.  I replaced my old
>>> pHash.h file and I got a new error message on building the project:
>>>
>>> make all-recursive
>>> make[1]: Entering directory `/home/kdge/pHash-0.7.2'
>>> Making all in src
>>> make[2]: Entering directory `/home/kdge/pHash-0.7.2/src'
>>> /bin/bash ../libtool --tag=CXX --mode=compile g++ -DHAVE_CONFIG_H -I.
>>> -I.. -I/usr/lib/jvm/java-6-sun/include -I/usr/local/include
>>> -DHAVE_IMAGE_HASH=1 -DHAVE_VIDEO_HASH=1 -DHAVE_AUDIO_HASH=1
>>> -Dcimg_use_jpeg -Dcimg_use_png -O2 -ffast-math -O3 -MT pHash.lo -MD
>>> -MP -MF .deps/pHash.Tpo -c -o pHash.lo pHash.cpp
>>> libtool: compile: g++ -DHAVE_CONFIG_H -I. -I..
>>> -I/usr/lib/jvm/java-6-sun/include -I/usr/local/include
>>> -DHAVE_IMAGE_HASH=1 -DHAVE_VIDEO_HASH=1 -DHAVE_AUDIO_HASH=1
>>> -Dcimg_use_jpeg -Dcimg_use_png -O2 -ffast-math -O3 -MT pHash.lo -MD
>>> -MP -MF .deps/pHash.Tpo -c pHash.cpp -fPIC -DPIC -o .libs/pHash.o
>>> In file included from pHash.cpp:25:
>>> pHash.h:263: error: declaration of C function ‘int
>>> ph_image_digest(const char*, double, double, Digest&, int)’ conflicts
>>> with
>>> pHash.h:253: error: previous declaration ‘int ph_image_digest(const
>>> cimg_library::CImg<unsigned char>&, double, double, Digest&, int)’
>>> here
>>> In file included from pHash.cpp:25:
>>> pHash.h:288: error: declaration of C function ‘int
>>> ph_compare_images(const char*, const char*, double&, double, double,
>>> int, double)’ conflicts with
>>> pHash.h:276: error: previous declaration ‘int ph_compare_images(const
>>> cimg_library::CImg<unsigned char>&, const cimg_library::CImg<unsigned
>>> char>&, double&, double, double, int, double)’ here
>>> pHash.h:398: error: declaration of C function ‘MVPRetCode
>>> ph_query_mvptree(MVPFile*, DP*, int, float, DP**, int*)’ conflicts
>>> with
>>> pHash.h:386: error: previous declaration ‘MVPRetCode
>>> ph_query_mvptree(MVPFile*, DP*, int, float, DP**, int*, int)’ here
>>> pHash.h:417: error: declaration of C function ‘MVPRetCode
>>> ph_save_mvptree(MVPFile*, DP**, int)’ conflicts with
>>> pHash.h:408: error: previous declaration ‘FileIndex*
>>> ph_save_mvptree(MVPFile*, DP**, int, int, int)’ here
>>> pHash.h:433: error: declaration of C function ‘int
>>> ph_add_mvptree(MVPFile*, DP**, int)’ conflicts with
>>> pHash.h:425: error: previous declaration ‘MVPRetCode
>>> ph_add_mvptree(MVPFile*, DP*, int)’ here
>>> make[2]: *** [pHash.lo] Error 1
>>> make[2]: Leaving directory `/home/kdge/pHash-0.7.2/src'
>>> make[1]: *** [all-recursive] Error 1
>>> make[1]: Leaving directory `/home/kdge/pHash-0.7.2'
>>> make: *** [all] Error 2
>>>
>>> Full output at http://gist.github.com/275677
>>>
>>> Don't know much about C, but it looks like it might have to do with
>>> the "same name but different parameter" methods you mentioned before.
>>>
>>> Let me know if there is anything else you want me to test out.
>>>
>>> Thanks,
>>>
>>> Seb
>>>
>>> On Tue, Jan 12, 2010 at 1:27 PM, Evan Klinger <eklinger at phash.org> wrote:
>>>> Sebastian,
>>>> I don't think you can put it at the very beginning. It should be after
>>>> the #includes. You will also run into another error because some of
>>>> the functions have the same name but different parameters, but extern
>>>> "C" only expects unique function names. Please try using this header
>>>> instead and see if it works. Hang in there - we will get it working
>>>> for you.
>>>>
>>>> Evan
>>>>
>>>> On Tue, Jan 12, 2010 at 10:20 AM, Sebastian Gallese
>>>> <sebastiangallese at gmail.com> wrote:
>>>>> Hi Evan,
>>>>>
>>>>> In pHash-0.7.2/src/pHash.h I added
>>>>> extern "C" {
>>>>> to the very top of the file and
>>>>> }
>>>>> to the very bottom of the file.  I got the idea to do that from reading
>>>>> http://stackoverflow.com/questions/1041866/extern-c
>>>>> and
>>>>> http://www.parashift.com/c++-faq-lite/mixing-c-and-cpp.html
>>>>>
>>>>> I then ran
>>>>> sudo CPPFLAGS=-I/usr/lib/jvm/java-6-sun/include ./configure
>>>>> --enable-java && sudo make && sudo make install
>>>>>
>>>>> and I got the output that and uploaded it to http://gist.github.com/275427
>>>>>
>>>>> It goes haywire around here:
>>>>> In file included from /usr/include/c++/4.4/cmath:44,
>>>>>                 from /usr/include/CImg.h:75,
>>>>>                 from pHash.h:47,
>>>>>                 from pHash.cpp:25:
>>>>> /usr/include/c++/4.4/bits/cpp_type_traits.h:71: error: template with C linkage
>>>>> /usr/include/c++/4.4/bits/cpp_type_traits.h:81: error: template with C linkage
>>>>>
>>>>> Any thoughts or suggestions would be great!
>>>>>
>>>>> Thank you,
>>>>> Seb
>>>>>
>>>>> On Mon, Jan 11, 2010 at 2:00 PM, Evan Klinger <eklinger at phash.org> wrote:
>>>>>> Sebastian,
>>>>>> It looks like the entire API might need to be wrapped in extern "C" to
>>>>>> get this to work. To be honest, you're the first that is attempting to
>>>>>> use the Java bindings so it's a learning process for both of us. There
>>>>>> is an example on how to use the functions in pHash.java in main(). Try
>>>>>> adding the extern "C" to all the functions in pHash.h and rebuild and
>>>>>> see if that helps. Sorry for the trouble.
>>>>>> Thanks
>>>>>>
>>>>>> On Mon, Jan 11, 2010 at 9:30 AM, Sebastian Gallese
>>>>>> <sebastiangallese at gmail.com> wrote:
>>>>>>> Hi Evan,
>>>>>>>
>>>>>>> I'm unsure of how I should use pHash with Java.  Do you have some
>>>>>>> basic test code or demo code to show me the basic usage?
>>>>>>>
>>>>>>> For example, right now I'm trying to call on pHash to get a hash from an image.
>>>>>>>
>>>>>>> I threw the file from pHash-0.7.2/bindings/java/pHash.java into a
>>>>>>> package in Eclipse.
>>>>>>>
>>>>>>> http://github.com/sgallese/sgallese/tree/master/src/pHashTest/
>>>>>>>
>>>>>>> As you can see from the above code, I have phash.java side by side
>>>>>>> with PHashTest.java in a package caled pHashTest
>>>>>>>
>>>>>>> In PHashTest.java, I just wanted to instantiate pHash, so I have the
>>>>>>> following code:
>>>>>>>
>>>>>>> package pHashTest;
>>>>>>>
>>>>>>>        public class PHashTest {
>>>>>>>            public static void main(String[] args) {
>>>>>>>                pHash mypHash = new pHash();
>>>>>>>            }
>>>>>>>        }
>>>>>>>
>>>>>>> I kept getting the error "java.lang.UnsatisfiedLinkError: no pHash-jni
>>>>>>> in java.library.path" so I searched for pHash-jni on my system and
>>>>>>> found these:
>>>>>>>
>>>>>>> /usr/local/include/pHash-jni.h
>>>>>>> /usr/local/lib/libpHash-jni.so
>>>>>>> /usr/local/lib/libpHash-jni.so.0
>>>>>>> /usr/local/lib/libpHash-jni.so.0.0.0
>>>>>>> /usr/local/lib/libpHash-jni.la
>>>>>>> /usr/local/lib/libpHash-jni.a
>>>>>>>
>>>>>>> In Eclipse, I then went to run -> run configurations -> Environment
>>>>>>> (tab) and I set LD_LIBRARY_PATH to /usr/local/lib/
>>>>>>>
>>>>>>> Then I tried to initiate a pHash object again (i.e., pHash mypHash =
>>>>>>> new pHash(); ) and I'd get the following error.
>>>>>>>
>>>>>>> Exception in thread "main" java.lang.UnsatisfiedLinkError:
>>>>>>> /usr/local/lib/libpHash-jni.so.0.0.0:
>>>>>>> /usr/local/lib/libpHash-jni.so.0.0.0: undefined symbol:
>>>>>>> _ZL17ph_free_datapointP12ph_datapoint
>>>>>>>        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
>>>>>>>        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1778)
>>>>>>>        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1703)
>>>>>>>        at java.lang.Runtime.loadLibrary0(Runtime.java:823)
>>>>>>>        at java.lang.System.loadLibrary(System.java:1028)
>>>>>>>        at pHashTest.pHash.<clinit>(pHash.java:47)
>>>>>>>        at pHashTest.PHashTest.main(PHashTest.java:6)
>>>>>>>
>>>>>>> I figured I'd then try to make an ImageHash object using the code
>>>>>>>
>>>>>>> ImageHash mypHash = new ImageHash("/home/kdge/Pictures/cc.jpg");
>>>>>>>
>>>>>>> but ImageHash would not take a string in its constructor.
>>>>>>>
>>>>>>> Any help is greatly appreciated!
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Seb
>>>>>>> _______________________________________________
>>>>>>> pHash-support mailing list
>>>>>>> pHash-support at lists.phash.org
>>>>>>> http://lists.phash.org/listinfo.cgi/phash-support-phash.org
>>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> pHash-support mailing list
>>>>> pHash-support at lists.phash.org
>>>>> http://lists.phash.org/listinfo.cgi/phash-support-phash.org
>>>>>
>>>>
>>>
>>
>

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