[pHash-support] Java usage of pHash.java
Sebastian Gallese
sebastiangallese at gmail.com
Tue Jan 12 14:10:59 PST 2010
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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