java - 未找到 Native Lcom/slytechs/library/NativeLibrary 的实现

Question

我在 Android 项目中使用 JNetPcap 库:即使我将 JNetPcap 设置为项目的库，我也无法使用此代码访问我的 native 应用程序。

有人可以帮助我吗？拜托了

我的代码如下:

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.List;

import org.jnetpcap.PcapIf;
import org.jnetpcap.packet.JMemoryPacket;
import org.jnetpcap.packet.JPacket;
import org.jnetpcap.protocol.JProtocol;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Server_Android extends Activity{

    private final static int SERVER_PORT = 1234;
//    public final static int RECEIVING_TIMEOUT_SERVER = 3000;
    DatagramSocket socket;
    DatagramPacket packetOut;
    DatagramPacket packetIn;
    byte[] DataIn;
    byte[] DataOut;
    List<PcapIf> alldevs;
    StringBuilder errbuf;

    /*Android widgets*/
    TextView text;
    EditText edit;
    Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_server_android);
        //text = (EditText)
        button =(Button)findViewById(R.id.button1);
        edit = (EditText)findViewById(R.id.editText1);
        text =(TextView)findViewById(R.id.textView2);   
        text.setText("");

        handlingpacket();

        /* Thread for receiving Data from CLient */
        new Thread(new Message_handler()).start();
            try {   
        Thread.sleep(500);
        reply();
        }catch(InterruptedException e){
            Log.e("UDP", "UDP receive failed!");
        }

    }

//  
    public void handlingpacket(){

        JPacket jmp = new JMemoryPacket(JProtocol.UDP_ID,
                  "001801bf 6adc0025 4bb7afec 08004500 "  
                + " 0041a983 40004006 d69ac0a8 00342f8c "  
                + " ca30c3ef 008f2e80 11f52ea8 4b578018 "  
                + " ffffa6ea 00000101 080a152e ef03002a "  
                + " 2c943538 322e3430 204e4f4f 500d0a");
        text.append("" + jmp);

    }
//  
    public class Message_handler implements Runnable{

            public Message_handler(){}

            public void run(){

            try {
                DataOut = new byte[1024];

            while(true){

                    socket = new DatagramSocket(SERVER_PORT);
                    socket.setReuseAddress(true);
                    socket.setBroadcast(true);
        //          socket.setSoTimeout(RECEIVING_TIMEOUT_SERVER);
                    packetIn = new DatagramPacket(DataOut,DataOut.length);          
                    socket.receive(packetIn);

                        runOnUiThread( new Runnable(){ // original thread for UI interactions

                                public void run(){
                                    String message = new String(packetIn.getData());
                                    text.append("Message " + message +"\n From :" + packetIn.getAddress() + " on port : "+  packetIn.getPort() +"\n");
                                    Log.d("UDP", "le message reçu");
                                    Log.d("Message : ", "" + message);  

                                }
                        });


                }
            }
                catch(UnknownHostException exc) {
                    exc.printStackTrace();
                }
                catch(SocketException exc) {
                    System.out.println("Problem openning socket");
                }
                catch(IOException exc) {
                    System.out.println("Problem in reception of messages");
                }

            socket.close();

            }

        }

        public void reply(){

            DataIn = new byte[1024];
            button.setOnClickListener( new Button.OnClickListener(){    

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                        try {

                        socket = new DatagramSocket(); 
                        String str = edit.getText().toString();
                        DataIn = str.getBytes();
                        packetOut = new DatagramPacket(DataIn, DataIn.length, packetIn.getAddress(), packetIn.getPort());
                        socket.send(packetOut);
                        }catch (SocketException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        }   
                         catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                });

        }
}

日志文件:

08-21 11:18:36.755: W/dalvikvm(776): No implementation found for native Lcom/slytechs/library/NativeLibrary;.dlopen (Ljava/lang/String;)J
08-21 11:18:36.755: W/dalvikvm(776): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lorg/jnetpcap/nio/JMemory;
08-21 11:18:36.755: D/AndroidRuntime(776): Shutting down VM
08-21 11:18:36.755: W/dalvikvm(776): threadid=1: thread exiting with uncaught exception (group=0x40a2d1f8)
08-21 11:18:36.760: E/AndroidRuntime(776): FATAL EXCEPTION: main
08-21 11:18:36.760: E/AndroidRuntime(776): java.lang.ExceptionInInitializerError
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.example.server_android.Server_Android.handlingpacket(Server_Android.java:66)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.example.server_android.Server_Android.onCreate(Server_Android.java:50)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.app.Activity.performCreate(Activity.java:4465)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2033)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2104)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.app.ActivityThread.access$600(ActivityThread.java:132)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1157)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.os.Looper.loop(Looper.java:137)
08-21 11:18:36.760: E/AndroidRuntime(776):  at android.app.ActivityThread.main(ActivityThread.java:4575)
08-21 11:18:36.760: E/AndroidRuntime(776):  at java.lang.reflect.Method.invokeNative(Native Method)
08-21 11:18:36.760: E/AndroidRuntime(776):  at java.lang.reflect.Method.invoke(Method.java:511)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
08-21 11:18:36.760: E/AndroidRuntime(776):  at dalvik.system.NativeStart.main(Native Method)
08-21 11:18:36.760: E/AndroidRuntime(776): Caused by: java.lang.UnsatisfiedLinkError: dlopen
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.slytechs.library.NativeLibrary.dlopen(Native Method)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.slytechs.library.NativeLibrary.<init>(Unknown Source)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.slytechs.library.JNILibrary.<init>(Unknown Source)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.slytechs.library.JNILibrary.loadLibrary(Unknown Source)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.slytechs.library.JNILibrary.register(Unknown Source)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.slytechs.library.JNILibrary.register(Unknown Source)
08-21 11:18:36.760: E/AndroidRuntime(776):  at com.slytechs.library.JNILibrary.register(Unknown Source)
08-21 11:18:36.760: E/AndroidRuntime(776):  at org.jnetpcap.nio.JMemory.<clinit>(Unknown Source)
08-21 11:18:36.760: E/AndroidRuntime(776):  ... 16 more

Answer 1

我刚刚在我的应用程序中纠正了这个问题。

如果您从 IDE 运行此程序，请确保您的 DLL 和 IDE 都是 32 位或 64 位。

否则，请将 DLL 放在执行 jar 的同一文件夹中，或使用 -Djava.library.path 指定位置。