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    <p>As JNI use C calling convention (cdecl), there are no arguments information in the function signature. You need to analysis the corresponding java(dalvik) code to find out the arguments type.</p> <p>Here is my jni library:</p> <pre><code>00001408 g DF .text 0000000a Java_info_kghost_android_openvpn_FileDescriptorHolder_close 00001a14 g DF .text 00000198 Java_info_kghost_android_openvpn_ManagementSocket_read__ILjava_nio_ByteBuffer_2II 00001414 g DF .text 0000000c Java_info_kghost_android_openvpn_ManagementSocket_shutdown 000017c4 g DF .text 00000250 Java_info_kghost_android_openvpn_ManagementSocket_read__ILjava_nio_ByteBuffer_2IILinfo_kghost_android_openvpn_FileDescriptorHolder_2 0000142c g DF .text 00000200 Java_info_kghost_android_openvpn_ManagementSocket_write__ILjava_nio_ByteBuffer_2IILinfo_kghost_android_openvpn_FileDescriptorHolder_2 00001420 g DF .text 0000000a Java_info_kghost_android_openvpn_ManagementSocket_close 0000162c g DF .text 00000198 Java_info_kghost_android_openvpn_ManagementSocket_write__ILjava_nio_ByteBuffer_2II 00001bd4 g DF .text 000000d4 Java_info_kghost_android_openvpn_ManagementSocket_open </code></pre> <p>if there is no overload method, the signature won't contain arguments information; if the method is overloaded, the signature will contain arguments information in function name.</p> <p>And you need to load the jni library explicitly before using the native method:</p> <pre><code>System.loadLibrary("your-library-name"); </code></pre> <p>Make sure your library is placed inside <code>LD_LIBRARY_PATH</code>, <code>/lib</code> directory on Android, check the mmap (<code>/proc/pid/maps</code>) to see if it is loaded successful.</p>
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    1. POAndroid - NDK Shared libraries extracting relevant JNI hooks with nm / objdump
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    1. USZang MingJie
    1. USZang MingJie
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    1. COThis sounds plausible, but often the VM will complain that it cannot find the function matching signature Lcom...(IIIII)V.
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      1. USKevin Parker
    2. COYou have to insure the library is loaded
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      1. USZang MingJie
    3. COThe library is loaded... There must be a way to get the function signature from the shared library with public facing JNI hooks.
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      1. USKevin Parker
 

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