我正在处理一些本地代码以将RPI感应帽与我的java东西进行接口,而且我无法让我的本机意味着。我已经在java中编写了存根,编译它然后使用javah来提取头文件。我创建了C中的方法来将一个简单的char数组转换为一个字符串来返回。我似乎无法得到它编译。 的Java:无法编译JNI C不兼容的指针类型
/**
* NativeTest - PACKAGE_NAME
* Created by matthew on 21/07/16.
*/
class SenseHat
{
static {
System.loadLibrary("SenseHat");
}
public native String getTemperature();
public native String getHumidity();
public native String getOrientation();
}
头文件
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class SenseHat */
#ifndef _Included_SenseHat
#define _Included_SenseHat
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: SenseHat
* Method: getTemperature
* Signature:()Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_SenseHat_getTemperature
(JNIEnv *, jobject);
/*
* Class: SenseHat
* Method: getHumidity
* Signature:()Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_SenseHat_getHumidity
(JNIEnv *, jobject);
/*
* Class: SenseHat
* Method: getOrientation
* Signature:()Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_SenseHat_getOrientation
(JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif
C文件:
#include <jni.h>
#include <stdio.h>
#include "SenseHat.h"
JNIEXPORT jstring JNICALL Java_SenseHat_getTemperature(JNIEnv *env, jobject thisObj) {
char done[] = "temperature";
jstring answer;
/* Make a new String based on done, then free done. */
answer = (*env)->NewStringUTF(env,&done);
free(done);
return answer;
}
JNIEXPORT jstring JNICALL Java_SenseHat_getHumidity(JNIEnv *env, jobject thisObj) {
char done[9] = "humidity";
jstring answer;
/* Make a new String based on done, then free done. */
answer = (*env)->NewStringUTF(env,&done);
free(done);
return answer;
}
JNIEXPORT jstring JNICALL Java_SenseHat_getOrientation(JNIEnv *env, jobject thisObj) {
char done[12] = "orientation";
jstring answer;
/* Make a new String based on done, then free done. */
answer = (*env)->NewStringUTF(env,&done);
free(done);
return answer;
}
我使用下面的命令编译它:
gcc -I /usr/lib/jvm/jdk-8-oracle-arm32-vfp-hflt/include/ -I /usr/lib/jvm/jdk-8-oracle-arm32-vfp-hflt/include/linux/ -shared -o libSenseHat.so SenseHat.c
你能提供编译器输出吗? – Sergio