Leshi Wang Leshi Wang - 6 months ago 9
Java Question

jni.h: no such file or directory

I'm using Code::Blocks in windows.

I created a dll project trying to get some JNI practice.

In my .h file generated by javah, there's #include jni.h, but when I try to compile it, it keeps saying jni.h: no such file or directory.

I think it has something to do with classpath, but I don't know what it is! It's probably setting that I have to change in Code::Blocks

Could someone please help me to fix it?
many thanks

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class Vector3D */

#ifndef _Included_Vector3D
#define _Included_Vector3D
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: Vector3D
* Method: magnitude
* Signature: ()D
*/
JNIEXPORT jdouble JNICALL Java_Vector3D_magnitude
(JNIEnv *, jobject);

/*
* Class: Vector3D
* Method: mult
* Signature: (LVector3D;I)LVector3D;
*/
JNIEXPORT jobject JNICALL Java_Vector3D_mult
(JNIEnv *, jobject, jobject, jint);

/*
* Class: Vector3D
* Method: equals
* Signature: (LVector3D;)Z
*/
JNIEXPORT jboolean JNICALL Java_Vector3D_equals
(JNIEnv *, jobject, jobject);

/*
* Class: Vector3D
* Method: dotProduct
* Signature: (LVector3D;LVector3D;)D
*/
JNIEXPORT jdouble JNICALL Java_Vector3D_dotProduct
(JNIEnv *, jclass, jobject, jobject);

/*
* Class: Vector3D
* Method: makeNormalized
* Signature: (LVector3D;)LVector3D;
*/
JNIEXPORT jobject JNICALL Java_Vector3D_makeNormalized
(JNIEnv *, jclass, jobject);

/*
* Class: Vector3D
* Method: crossProduct
* Signature: (LVector3D;LVector3D;)LVector3D;
*/
JNIEXPORT jobject JNICALL Java_Vector3D_crossProduct
(JNIEnv *, jclass, jobject, jobject);

#ifdef __cplusplus
}
#endif
#endif

Answer

You have to add the JDK path to the include path, so the compiler knows the location of the file.

Windows:

/I "$(JAVA_HOME)\include" /I "$(JAVA_HOME)\include\win32"

Linux:

-I"${JAVA_HOME}/include" -I"${JAVA_HOME}/include/linux"