NDK java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "_Z12getIPAddressPcS_" refer

06-16 10:42:39.334: D/dalvikvm(14575): Trying to load lib /data/app-lib/com.example.testjni-1/libAdapterJni.so 0x41ff8058
06-16 10:42:39.334: E/dalvikvm(14575): dlopen("/data/app-lib/com.example.testjni-1/libAdapterJni.so") failed: dlopen failed: cannot locate symbol "_Z12getIPAddressPcS_" referenced by "libAdapterJni.so"...
06-16 10:42:39.334: W/dalvikvm(14575): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lcom/example/testjni/AdapterJni;
06-16 10:42:39.334: D/AndroidRuntime(14575): Shutting down VM
06-16 10:42:39.334: W/dalvikvm(14575): threadid=1: thread exiting with uncaught exception (group=0x4173e700)
06-16 10:42:39.342: E/AndroidRuntime(14575): FATAL EXCEPTION: main
06-16 10:42:39.342: E/AndroidRuntime(14575): java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "_Z12getIPAddressPcS_" referenced by "libAdapterJni.so"...
06-16 10:42:39.342: E/AndroidRuntime(14575): at java.lang.Runtime.loadLibrary(Runtime.java:361)
06-16 10:42:39.342: E/AndroidRuntime(14575): at java.lang.System.loadLibrary(System.java:525)
06-16 10:42:39.342: E/AndroidRuntime(14575): at com.example.testjni.AdapterJni.<clinit>(AdapterJni.java:10)
06-16 10:42:39.342: E/AndroidRuntime(14575): at com.example.testjni.MainActivity$2.onClick(MainActivity.java:37)
06-16 10:42:39.342: E/AndroidRuntime(14575): at android.view.View.performClick(View.java:4240)
06-16 10:42:39.342: E/AndroidRuntime(14575): at android.view.View$PerformClick.run(View.java:17721)
06-16 10:42:39.342: E/AndroidRuntime(14575): at android.os.Handler.handleCallback(Handler.java:730)
06-16 10:42:39.342: E/AndroidRuntime(14575): at android.os.Handler.dispatchMessage(Handler.java:92)
06-16 10:42:39.342: E/AndroidRuntime(14575): at android.os.Looper.loop(Looper.java:137)
06-16 10:42:39.342: E/AndroidRuntime(14575): at android.app.ActivityThread.main(ActivityThread.java:5103)
06-16 10:42:39.342: E/AndroidRuntime(14575): at java.lang.reflect.Method.invokeNative(Native Method)
06-16 10:42:39.342: E/AndroidRuntime(14575): at java.lang.reflect.Method.invoke(Method.java:525)
06-16 10:42:39.342: E/AndroidRuntime(14575): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
06-16 10:42:39.342: E/AndroidRuntime(14575): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

06-16 10:42:39.342: E/AndroidRuntime(14575): at dalvik.system.NativeStart.main(Native Method)

解决方法：在c的代码中加入

#ifdef __cplusplus
extern "C" {
#endif

//---------------------------------

//---------------------------------

#ifdef __cplusplus
}
#endif