[英]java.lang.UnsatisfiedLinkError returned when calling native method
我正在嘗試為第三方DLL制作Java包裝器。 我創建了自己的DLL,充當JNI和第三方DLL之間的中間人。 在java中我加載此DLL很好,但返回錯誤java.lang.UnsatisfiedLinkError: sixense.Sixense.init()Z
. 可能導致此錯誤的原因是什么?我可以正確調試它?
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:
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");
}
}
摘自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;
}
摘自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);
dumpbin的輸出:
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
在Java中調用本機函數時,運行時會嘗試使用:
_functionName@n
,其中n是參數列表中的字節數, functionName
。 在使用MinGW進行編譯時,您將得到這兩者的混合:MinGW將追加@n
,但不會添加下划線: functionName@n
。
解決這個問題的方法是告訴ld
不要添加后綴,使用--kill-at
開關(或--kill-at
-Wl,--kill-at
如果通過GCC調用它-Wl,--kill-at
則為-Wl,--kill-at
)。
我找到了答案! 似乎在Windows中使用JNI時,它會查找以_Java_
開頭的函數,而在其他所有平台中查找Java_
。 為什么會出現這種情況,而不是寫在我不知道的文檔中,但它會使一切工作完美!
java.lang.UnsatisfiedLinkError: no Sixense_Java in java.library.path
看起來Java無法找到庫,你把它放在了正確的位置嗎?
您可能需要更改java.library.path
,看看這個 。
如果要打印它的內容,請使用:
System.out.println( System.getProperties().getProperty("java.library.path"));
這可能會打印很多,您可能想要split(";")
並自行打印每個條目。
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