调用本机方法时返回java.lang.UnsatisfiedLinkError [英] java.lang.UnsatisfiedLinkError returned when calling native method
问题描述
我正在尝试为第三方DLL制作Java包装器。我创建了我自己的DLL，作为JNI和第三方DLL之间的中间人。在java中，我加载这个DLL，但是返回错误 java.lang.UnsatisfiedLinkError：sixense.Sixense.init（）Z 。可能导致此错误，如何正确调试？
I am trying to make a Java wrapper for a third party DLL. I created my own DLL that acts as a middle man between JNI and the third party DLL. In java I load this DLL fine but the error java.lang.UnsatisfiedLinkError: sixense.Sixense.init()Z is returned. What could be causing this error and how can I debug it properly?
Main.java：
Main.java:
package sixense_test;
import sixense.ControllerData;
import sixense.Sixense;
public class Main {
public static ControllerData[] controllers = new ControllerData[4];
public static boolean quit;
public static void main(String[] args) {
if(Sixense.init()) {
Sixense.setActiveBase(0);
Sixense.getAllNewestData(controllers);
System.out.println("X: " + controllers[0].pos[0] + "Y: " + controllers[0].pos[1] + "Z: " + controllers[0].pos[2]);
}
}
}
Sixense.java： p>
Sixense.java:
package sixense;
public class Sixense {
public static native boolean init();
public static native boolean exit();
public static native int getMaxBases();
public static native boolean setActiveBase( int base_num );
public static native boolean isBaseConnected( int base_num );
public static native int getMaxControllers();
public static native int getNumActiveControllers();
public static native boolean isControllerEnabled( int controller_id );
public static native boolean getAllNewestData( ControllerData[] all_data );
public static native boolean getAllData( int index_back, ControllerData[] all_data );
public static native boolean getNewestData( int controller_id, ControllerData data );
public static native boolean getData( int controller_id, int index_back, ControllerData all_data );
public static native int getHistorySize();
public static native boolean setFilterEnabled( boolean on_or_off );
public static native boolean getFilterEnabled();
public static native boolean setFilterParams( float near_range, float near_val, float far_range, float far_val );
public static native boolean getFilterParams( float[] params );
public static native boolean triggerVibration( int controller_id, int duration, int pattern_id );
public static native boolean autoEnableHemisphereTracking( int controller_id );
public static native boolean setHighPriorityBinding( boolean on_or_off );
public static native boolean getHighPriorityBinding();
public static native boolean setBaseColor( int red, int green, int blue );
public static native boolean getColorBase( int[] colors );
static {
System.loadLibrary("Sixense_Java");
}
}
从sixense_Sixense.cpp摘录：
An excerpt from sixense_Sixense.cpp:
#include <jni.h>
#include <sixense.h>
#include "sixense_Sixense.h"
JNIEXPORT jboolean JNICALL Java_sixense_Sixense_init(JNIEnv *env, jclass obj) {
int i;
i = sixenseInit();
return (i == -1) ? JNI_FALSE : JNI_TRUE;
}
从sixense_Sixense.h摘录：
An excerpt from sixense_Sixense.h:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class sixense_Sixense */
#ifndef _Included_sixense_Sixense
#define _Included_sixense_Sixense
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: sixense_Sixense
* Method: init
* Signature: ()Z
*/
JNIEXPORT jboolean JNICALL Java_sixense_Sixense_init
(JNIEnv *, jclass);
来自dumpbin的输出：
Output from dumpbin:
File Type: DLL
Section contains the following exports for Sixense_Java.dll
00000000 characteristics
4FFBC481 time date stamp Tue Jul 10 01:58:25 2012
0.00 version
1 ordinal base
23 number of functions
23 number of names
ordinal hint RVA name
1 0 00001D10 Java_sixense_Sixense_autoEnableHemisphereTracking@12
2 1 000011A0 Java_sixense_Sixense_exit@8
3 2 00001A40 Java_sixense_Sixense_getAllData@16
4 3 000019A0 Java_sixense_Sixense_getAllNewestData@12
5 4 00001DC0 Java_sixense_Sixense_getColorBase@12
6 5 00001B30 Java_sixense_Sixense_getData@20
7 6 00001BD0 Java_sixense_Sixense_getFilterEnabled@8
8 7 00001C40 Java_sixense_Sixense_getFilterParams@12
9 8 00001D60 Java_sixense_Sixense_getHighPriorityBinding@8
10 9 00001B90 Java_sixense_Sixense_getHistorySize@8
11 A 000011C0 Java_sixense_Sixense_getMaxBases@8
12 B 00001210 Java_sixense_Sixense_getMaxControllers@8
13 C 00001AE0 Java_sixense_Sixense_getNewestData@16
14 D 00001220 Java_sixense_Sixense_getNumActiveControllers@8
15 E 00001180 Java_sixense_Sixense_init@8
16 F 000011F0 Java_sixense_Sixense_isBaseConnected@12
17 10 00001230 Java_sixense_Sixense_isControllerEnabled@12
18 11 000011D0 Java_sixense_Sixense_setActiveBase@12
19 12 00001D90 Java_sixense_Sixense_setBaseColor@20
20 13 00001BA0 Java_sixense_Sixense_setFilterEnabled@12
21 14 00001C00 Java_sixense_Sixense_setFilterParams@24
22 15 00001D30 Java_sixense_Sixense_setHighPriorityBinding@12
23 16 00001CE0 Java_sixense_Sixense_triggerVibration@20
Summary
1000 .bss
1000 .data
1000 .edata
1000 .idata
1000 .rdata
1000 .reloc
2000 .text
推荐答案
在Java中调用本地函数时，运行时尝试使用：
When calling a native function in Java, the runtime tries to use:
- 一个stdcall风格的装饰函数：
_functionName @ n，其中n是参数列表中的字节数， - 和cdecl样式未装饰的函数：
functionName。
- a stdcall-style decorated function:
_functionName@n, where n is the number of bytes in the parameter list, - and a cdecl-style undecorated function:
functionName.
使用MinGW进行编译时，您将得到这两者的混合：MinGW将附加 @n ，但不会在下划线之前添加： functionName @ n 。
When compiling with MinGW, you will get a mix of these two: MinGW will append the @n, but will not prepend the underscore: functionName@n.
解决方法这是告诉 ld 不要添加后缀，使用 - kill-at switch（或 -Wl， - kill-at ，如果您通过GCC呼叫）。
The way to solve this is to tell ld not to add the suffix, using the --kill-at switch (or -Wl,--kill-at if you call it through GCC).
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