JNI 从C文件向Java文件传递多个参数

JNI C主函数

 #include <jni.h>
 #include <string.h>
 #include <android/log.h>
 #include "Provider.h"
 #include "libCold_chain.h"

 JNIEnv* jniEnv;

 jint
 Java_com_panasonic_communicationtest_StateConfirmFragment_openSerialDevice( JNIEnv* env, jobject thiz, jstring devName )
 {
     const char* devName_id = (*env)->GetStringUTFChars(env, devName, NULL);
     if(jniEnv == NULL) {
         jniEnv = env;
     }

     return openSerialDevice(devName_id);
 }

 jint
 Java_com_panasonic_communicationtest_StateConfirmFragment_readSerialData( JNIEnv* env, jobject thiz )
 {
     long dataTest = ;

     if(jniEnv == NULL) {
         jniEnv = env;
     }

     jclass class;
     jfieldID send_instruction_record;
     jfieldID receive_instruction_record;
     class = (*env)->GetObjectClass(env, thiz);
     if (class == NULL)
     {
         return -;
     }
     send_instruction_record = (*env)->GetFieldID(env, class, "send_instruction_str", "Ljava/lang/String;");
     receive_instruction_record = (*env)->GetFieldID(env, class, "receive_instruction_str", "Ljava/lang/String;");
     if (send_instruction_record == NULL || receive_instruction_record == NULL)
     {
         return -;
     }

     unsigned char* rcmdReq = malloc(*sizeof(jchar));
     unsigned char* rcmdRes = malloc(*sizeof(jchar));

     if(readSerialData(, , , &dataTest, , rcmdReq, rcmdRes) == ){

         unsigned char* str1 = "hello fan sen!";
         unsigned char* str2 = rcmdReq;

         jstring jstr1 = (*env)->NewStringUTF(env, str1);
            jstring jstr2 = (*env)->NewStringUTF(env, str2);
         __android_log_print(ANDROID_LOG_INFO, "ComTest", rcmdReq);
            if(jstr1 == NULL || jstr2 == NULL){
                return ;
            }
            (*env)->SetObjectField(env, thiz, send_instruction_record, jstr1);
            (*env)->SetObjectField(env, thiz, receive_instruction_record, jstr2);

         return dataTest;
     }

     return -;
 }

 jint
 Java_com_panasonic_communicationtest_StateConfirmFragment_closeSerialDevice( JNIEnv* env, jobject thiz, jint devFd )
 {
     if(jniEnv == NULL) {
         jniEnv = env;
     }

     return closeSerialDevice(devFd);
 }

 //  ===========================================
 jint
 Java_com_panasonic_communicationtest_ParameterSettingFragment_openSerialDevice( JNIEnv* env, jobject thiz, jstring devName )
 {
     const char* devName_id = (*env)->GetStringUTFChars(env, devName, NULL);
     if(jniEnv == NULL) {
         jniEnv = env;
     }

     return openSerialDevice(devName_id);
 }

 jint
 Java_com_panasonic_communicationtest_ParameterSettingFragment_readSerialData( JNIEnv* env, jobject thiz, jint devFd, jchar unitno, jshort addr, jlong data )
 {
     if(jniEnv == NULL) {
         jniEnv = env;
     }

     unsigned char rcmdReq[];
     unsigned char rcmdRes[];

     return readSerialData(devFd, unitno, addr, data, , rcmdReq[], rcmdRes[]);
 }

 jint
 Java_com_panasonic_communicationtest_ParameterSettingFragment_writeSerialData( JNIEnv* env, jobject thiz, jint devFd, jchar unitno, jshort addr, jlong data )
 {
     if(jniEnv == NULL) {
         jniEnv = env;
     }

     unsigned char rcmdReq[];
     unsigned char rcmdRes[];

     return writeSerialData(devFd, unitno, addr, data, , rcmdReq[], rcmdRes[]);
 }

 jint
 Java_com_panasonic_communicationtest_ParameterSettingFragment_closeSerialDevice( JNIEnv* env, jobject thiz, jint devFd )
 {
     if(jniEnv == NULL) {
         jniEnv = env;
     }

     return closeSerialDevice(devFd);
 }

 //--------------------------------------
 jstring
 Java_com_panasonic_communicationtest_StateConfirmFragment_getStringFromJNI( JNIEnv* env, jobject thiz, jstring address )
 {
     const char* address_id = (*env)->GetStringUTFChars(env, address, NULL);
     if(jniEnv == NULL) {
         jniEnv = env;
     }

 //    return getString(address_id);
     return (*env)->NewStringUTF(env, address_id);
 }

 jstring
 Java_com_panasonic_communicationtest_ParameterSettingFragment_getStringFromJNI( JNIEnv* env, jobject thiz, jstring address )
 {
     const char* address_id = (*env)->GetStringUTFChars(env, address, NULL);
     if(jniEnv == NULL) {
         jniEnv = env;
     }
     return getString(address_id);
 }

 jstring
 Java_com_panasonic_communicationtest_ParameterSettingFragment_setStringIntoJNI( JNIEnv* env, jobject thiz, jstring address )
 {
     const char* address_id = (*env)->GetStringUTFChars(env, address, NULL);
     if(jniEnv == NULL) {
         jniEnv = env;
     }
     return setString(address_id);
 }

JNI C代码

 extern long readSerialData(long devFd, unsigned char unitno, unsigned short addr, long *data, long timeout, unsigned char* rcmdReq, unsigned char* rcmdRes)
 {
     /*
      * Test by fansen
      */

     *data = ;
     int m = ;
     int n = ;
     unsigned char test[] = "";    //{0xff,0x1f,0x07,0x08};
     strcpy(rcmdReq, test);

 //    rcmdReq = test;
 //    for(m = 0; m <= 8; m++){
 //        rcmdReq[m] = test[m];
 //        LOGI("test1: %c", test[m]);
 //    }

     LOGI(rcmdReq);

 //    char test2[10] = {0xff,0x1f,0x07,0x08,0x00,0x87,0x00,0x01};
 //    __android_log_print(ANDROID_LOG_INFO, "ComTest", "Communication Test 2");
 //    for(n = 0; n <= 9; n++){
 //        rcmdReq[n] = test2[n];
 //    }

     return OK;

     /*
      * Test over
      */