java JNI未满足链接错误：（类）。（方法）V

1 年，3 月 Questions & Answers 70

我在CS课程介绍的最后一个项目中使用了JNI。我几乎可以让它工作，但有一个错误，这是困扰我整个周末。我在很多地方都找过了，但都没能修好

我得到的错误是：java。lang.UnsatifiedLinkError:JNI_函数。dllHello（）V

我的代码：

////////////////////////
// JNI_Functions.c

    #include "JNI_Functions.h"
    #include <jni.h>
    #include <stdio.h>

    JNIEXPORT void JNICALL Java_JNI_1Functions_dllHello(JNIEnv *env, jobject obj) {
        printf("This was sent from the DLL\n");
        return;
    }

///////////////////////
// JNI_Functions.h

    /* DO NOT EDIT THIS FILE - it is machine generated */
    #include <jni.h>
    /* Header for class JNI_Functions */

    #ifndef _Included_JNI_Functions
    #define _Included_JNI_Functions
    #ifdef __cplusplus
    extern "C" {
    #endif

    /*
     * Class:     JNI_Functions
     * Method:    dllHello
     * Signature: ()V
     */

    JNIEXPORT void JNICALL Java_JNI_1Functions_dllHello
      (JNIEnv *, jobject);

    #ifdef __cplusplus
    }
    #endif
    #endif

//////////////////// JAVA ///////////////////
// Entry.java
    public class Entry {
        public static void main(String[] args) {
            try {
    //          JNI_Functions jni = new JNI_Functions();
    //          jni.dllHello();
                new JNI_Functions().dllHello();
            } catch (UnsatisfiedLinkError e) {
                System.out.println("Couldn't call native function.\n" + e);
            }
        }
    }

///////////////////////
// JNI_Functions.java


public class JNI_Functions {
    public JNI_Functions() {
        System.loadLibrary("JNI_Functions");
        System.out.println("Loaded JNI_Functions.dll");
    }

    // Prints out a simple hello world from the dll
    public native void dllHello();
}

我正在使用Code:：Blocks进行编译，如果需要，下面是输出：

-------------- Build: Release in JNI_Functions (compiler: GNU GCC Compiler)---------------

mingw32-gcc.exe -Wall -O2 -D_JNI_IMPLEMENTATION_ -Wl,--kill-at -ID:\JNITest -c D:\JNI_Functions\JNI_Functions.c -o obj\Release\JNI_Functions.o
mingw32-g++.exe -shared -Wl,--output-def=bin\Release\libJNI_Functions.def -Wl,--out-implib=bin\Release\libJNI_Functions.a -Wl,--dll  obj\Release\JNI_Functions.o  -o bin\Release\JNI_Functions.dll -s  
Output file is bin\Release\JNI_Functions.dll with size 9.00 KB
Process terminated with status 0 (0 minute(s), 9 second(s))
0 error(s), 0 warning(s) (0 minute(s), 9 second(s))

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java JNI未满足链接错误：（类）。（方法）V

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