4 jni opencv的使用

最新推荐文章于 2024-03-12 20:40:35 发布

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最新推荐文章于 2024-03-12 20:40:35 发布

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分类专栏： jni

本文链接：https://blog.youkuaiyun.com/qq_16949707/article/details/61619983

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本文记录了使用JNI将Java与C++的OpenCV库集成的过程，包括编译配置、库文件加载及解决链接错误等问题。通过一系列命令展示了如何正确设置环境变量并运行包含图像处理功能的Java程序。

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为啥直接都可以！

root@52acd6c79e97:/home/huxiang_j/work/jni/jni_opencv# g++ -I$JAVA_HOME/include/ -I$JAVA_HOME/include/linux -shared -fPIC -o libmyjni.so source.cpp
source.cpp: In function '_jstring* Java_jniOpencv_jniCanny(JNIEnv*, jobject, jstring)':
source.cpp:27:58: warning: converting 'false' to pointer type for argument 2 of 'const char* JNIEnv_::GetStringUTFChars(jstring, jboolean*)' [-Wconversion-null]
    const char * str_in = env->GetStringUTFChars(js, false);
                                                          ^
root@52acd6c79e97:/home/huxiang_j/work/jni/jni_opencv# g++ -I/usr/local/include/opencv -I/usr/local/include -L/usr/local/lib -lopencv_core -lopencv_imgproc -lopencv_highgui -I$JAVA_HOME/include/ -I$JAVA_HOME/include/linux -shared -fPIC -o libmyjni.so source.cpp
source.cpp: In function '_jstring* Java_jniOpencv_jniCanny(JNIEnv*, jobject, jstring)':
source.cpp:27:58: warning: converting 'false' to pointer type for argument 2 of 'const char* JNIEnv_::GetStringUTFChars(jstring, jboolean*)' [-Wconversion-null]
    const char * str_in = env->GetStringUTFChars(js, false);
                                                          ^

血泪史

root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# g++ source.cpp -I/usr/local/include/opencv -I/usr/local/include -L/usr/local/lib -lopencv_core -lopencv_imgproc -lopencv_highgui -I$JAVA_HOME/include/ -I$JAVA_HOME/include/linux -shared -fPIC -o libmyjni.so

啊啊啊

root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# ldd libmyjni.so 
    linux-vdso.so.1 =>  (0x00007ffc977ad000)
    libopencv_core.so.2.4 => /usr/local/lib/libopencv_core.so.2.4 (0x00007f645c663000)
    libopencv_imgproc.so.2.4 => /usr/local/lib/libopencv_imgproc.so.2.4 (0x00007f645c173000)
    libopencv_highgui.so.2.4 => /usr/local/lib/libopencv_highgui.so.2.4 (0x00007f645bd46000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f645ba42000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f645b82c000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f645b466000)
    libcudart.so.7.5 => /usr/local/cuda/lib64/libcudart.so.7.5 (0x00007f645b208000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f645afef000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f645add0000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f645abc8000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f645a8c2000)
    libpng12.so.0 => /lib/x86_64-linux-gnu/libpng12.so.0 (0x00007f645a69b000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f645ce6c000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f645a497000)
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# mv libmyjni.so libjniOpencv.so 
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# cp libjniOpencv.so ../TestNativeCode/bin/
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# ls
jniOpencv.class  jniOpencv.h  jniOpencv.java  libjniOpencv.so  source.cpp
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# java jniOpencv 
Exception in thread "main" java.lang.UnsatisfiedLinkError: no jniOpencv in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
    at java.lang.Runtime.loadLibrary0(Runtime.java:870)
    at java.lang.System.loadLibrary(System.java:1122)
    at jniOpencv.main(jniOpencv.java:6)
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# cp libjniOpencv.so ../TestNativeCode/bin/
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# ls
jniOpencv.class  jniOpencv.h  jniOpencv.java  libjniOpencv.so  source.cpp
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# java jniOpencv 
Exception in thread "main" java.lang.UnsatisfiedLinkError: no jniOpencv in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
    at java.lang.Runtime.loadLibrary0(Runtime.java:870)
    at java.lang.System.loadLibrary(System.java:1122)
    at jniOpencv.main(jniOpencv.java:6)
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# cd ..   
root@4cd44daf2b17:/home/huxiang_312/work/jni# ls
TestNativeCode       TestOencv_3_12  canny  g++_opencv  jni_abc     libmyjni.so
TestNativeCode_3_12  Testopencv      cpp    java        jni_opencv  src
root@4cd44daf2b17:/home/huxiang_312/work/jni# cd TestNativeCode
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode# ls
bin                                   libmyjni.so                libnativeCode.so  src
com_wwj_nativecode_TestNativeCode.h   libmyjni1.so               nativeCode.so
com_wwj_nativecode_TestNativeCode1.h  libmyjni_312opencvtest.so  source.cpp
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode# cd bin/
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode/bin# ls
com  com_wwj_nativecode_TestNativeCode.h  libjniOpencv.so  source.cpp
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode/bin# rm libjniOpencv.so 
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode/bin# cp ../ 
.classpath                            libmyjni1.so
.project                              libmyjni_312opencvtest.so
.settings/                            libnativeCode.so
bin/                                  nativeCode.so
com_wwj_nativecode_TestNativeCode.h   source.cpp
com_wwj_nativecode_TestNativeCode1.h  src/
libmyjni.so                           
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode/bin# cp ../../jni_opencv/
jniOpencv.class  jniOpencv.h      jniOpencv.java   libjniOpencv.so  source.cpp
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode/bin# cp ../../jni_opencv/libjniOpencv.so  .
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode/bin# ls
com  com_wwj_nativecode_TestNativeCode.h  libjniOpencv.so  source.cpp
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode/bin# cd ..
root@4cd44daf2b17:/home/huxiang_312/work/jni/TestNativeCode# cd ..
root@4cd44daf2b17:/home/huxiang_312/work/jni# ls
TestNativeCode       TestOencv_3_12  canny  g++_opencv  jni_abc     libmyjni.so
TestNativeCode_3_12  Testopencv      cpp    java        jni_opencv  src
root@4cd44daf2b17:/home/huxiang_312/work/jni# cd jni_opencv/
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# ls
jniOpencv.class  jniOpencv.h  jniOpencv.java  libjniOpencv.so  source.cpp
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# java jniOpencv 
Exception in thread "main" java.lang.UnsatisfiedLinkError: no jniOpencv in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
    at java.lang.Runtime.loadLibrary0(Runtime.java:870)
    at java.lang.System.loadLibrary(System.java:1122)
    at jniOpencv.main(jniOpencv.java:6)
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# ldd libjniOpencv.so 
    linux-vdso.so.1 =>  (0x00007fff1ed13000)
    libopencv_core.so.2.4 => /usr/local/lib/libopencv_core.so.2.4 (0x00007f0a9459c000)
    libopencv_imgproc.so.2.4 => /usr/local/lib/libopencv_imgproc.so.2.4 (0x00007f0a940ac000)
    libopencv_highgui.so.2.4 => /usr/local/lib/libopencv_highgui.so.2.4 (0x00007f0a93c7f000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f0a9397b000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f0a93765000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0a9339f000)
    libcudart.so.7.5 => /usr/local/cuda/lib64/libcudart.so.7.5 (0x00007f0a93141000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f0a92f28000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f0a92d09000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f0a92b01000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f0a927fb000)
    libpng12.so.0 => /lib/x86_64-linux-gnu/libpng12.so.0 (0x00007f0a925d4000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f0a94da5000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f0a923d0000)
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# export LD_LIBRARY_PATH=/home/huxiang_j/work/jni/jni_opencv         
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# java jniOpencv 
Exception in thread "main" java.lang.UnsatisfiedLinkError: no jniOpencv in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
    at java.lang.Runtime.loadLibrary0(Runtime.java:870)
    at java.lang.System.loadLibrary(System.java:1122)
    at jniOpencv.main(jniOpencv.java:6)
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# export LD_LIBRARY_PATH=/home/huxiang_312/work/jni/jni_opencv
root@4cd44daf2b17:/home/huxiang_312/work/jni/jni_opencv# java jniOpencv 
 hello jniOpencv 
reading/home/huxiang_j/data/1.jpgnow
read successful!
canny now!
write now!
write successful!
tem1:/home/huxiang_j/data/1.jpg tem2:/home/huxiang_j/data/canny.jpg
/home/huxiang_j/data/canny.jpg