JNI 从C文件向Java文件传递多个参数

JNI C主函数

  1 #include <jni.h>
  2 #include <string.h>
  3 #include <android/log.h>
  4 #include "Provider.h"
  5 #include "libCold_chain.h"
  6
  7 JNIEnv* jniEnv;
  8
  9 jint
 10 Java_com_panasonic_communicationtest_StateConfirmFragment_openSerialDevice( JNIEnv* env, jobject thiz, jstring devName )
 11 {
 12     const char* devName_id = (*env)->GetStringUTFChars(env, devName, NULL);
 13     if(jniEnv == NULL) {
 14         jniEnv = env;
 15     }
 16
 17     return openSerialDevice(devName_id);
 18 }
 19
 20 jint
 21 Java_com_panasonic_communicationtest_StateConfirmFragment_readSerialData( JNIEnv* env, jobject thiz )
 22 {
 23     long dataTest = 0;
 24
 25     if(jniEnv == NULL) {
 26         jniEnv = env;
 27     }
 28
 29     jclass class;
 30     jfieldID send_instruction_record;
 31     jfieldID receive_instruction_record;
 32     class = (*env)->GetObjectClass(env, thiz);
 33     if (class == NULL)
 34     {
 35         return -1;
 36     }
 37     send_instruction_record = (*env)->GetFieldID(env, class, "send_instruction_str", "Ljava/lang/String;");
 38     receive_instruction_record = (*env)->GetFieldID(env, class, "receive_instruction_str", "Ljava/lang/String;");
 39     if (send_instruction_record == NULL || receive_instruction_record == NULL)
 40     {
 41         return -1;
 42     }
 43
 44     unsigned char* rcmdReq = malloc(9*sizeof(jchar));
 45     unsigned char* rcmdRes = malloc(10*sizeof(jchar));
 46
 47     if(readSerialData(1, 1, 80, &dataTest, 500, rcmdReq, rcmdRes) == 0){
 48
 49         unsigned char* str1 = "hello fan sen!";
 50         unsigned char* str2 = rcmdReq;
 51
 52         jstring jstr1 = (*env)->NewStringUTF(env, str1);
 53            jstring jstr2 = (*env)->NewStringUTF(env, str2);
 54         __android_log_print(ANDROID_LOG_INFO, "ComTest", rcmdReq);
 55            if(jstr1 == NULL || jstr2 == NULL){
 56                return 2;
 57            }
 58            (*env)->SetObjectField(env, thiz, send_instruction_record, jstr1);
 59            (*env)->SetObjectField(env, thiz, receive_instruction_record, jstr2);
 60
 61         return dataTest;
 62     }
 63
 64     return -1;
 65 }
 66
 67 jint
 68 Java_com_panasonic_communicationtest_StateConfirmFragment_closeSerialDevice( JNIEnv* env, jobject thiz, jint devFd )
 69 {
 70     if(jniEnv == NULL) {
 71         jniEnv = env;
 72     }
 73
 74     return closeSerialDevice(devFd);
 75 }
 76
 77 //  ===========================================
 78 jint
 79 Java_com_panasonic_communicationtest_ParameterSettingFragment_openSerialDevice( JNIEnv* env, jobject thiz, jstring devName )
 80 {
 81     const char* devName_id = (*env)->GetStringUTFChars(env, devName, NULL);
 82     if(jniEnv == NULL) {
 83         jniEnv = env;
 84     }
 85
 86     return openSerialDevice(devName_id);
 87 }
 88
 89 jint
 90 Java_com_panasonic_communicationtest_ParameterSettingFragment_readSerialData( JNIEnv* env, jobject thiz, jint devFd, jchar unitno, jshort addr, jlong data )
 91 {
 92     if(jniEnv == NULL) {
 93         jniEnv = env;
 94     }
 95
 96     unsigned char rcmdReq[10];
 97     unsigned char rcmdRes[10];
 98
 99     return readSerialData(devFd, unitno, addr, data, 500, rcmdReq[10], rcmdRes[10]);
100 }
101
102 jint
103 Java_com_panasonic_communicationtest_ParameterSettingFragment_writeSerialData( JNIEnv* env, jobject thiz, jint devFd, jchar unitno, jshort addr, jlong data )
104 {
105     if(jniEnv == NULL) {
106         jniEnv = env;
107     }
108
109     unsigned char rcmdReq[10];
110     unsigned char rcmdRes[10];
111
112     return writeSerialData(devFd, unitno, addr, data, 500, rcmdReq[10], rcmdRes[10]);
113 }
114
115 jint
116 Java_com_panasonic_communicationtest_ParameterSettingFragment_closeSerialDevice( JNIEnv* env, jobject thiz, jint devFd )
117 {
118     if(jniEnv == NULL) {
119         jniEnv = env;
120     }
121
122     return closeSerialDevice(devFd);
123 }
124
125
126
127 //--------------------------------------
128 jstring
129 Java_com_panasonic_communicationtest_StateConfirmFragment_getStringFromJNI( JNIEnv* env, jobject thiz, jstring address )
130 {
131     const char* address_id = (*env)->GetStringUTFChars(env, address, NULL);
132     if(jniEnv == NULL) {
133         jniEnv = env;
134     }
135
136 //    return getString(address_id);
137     return (*env)->NewStringUTF(env, address_id);
138 }
139
140 jstring
141 Java_com_panasonic_communicationtest_ParameterSettingFragment_getStringFromJNI( JNIEnv* env, jobject thiz, jstring address )
142 {
143     const char* address_id = (*env)->GetStringUTFChars(env, address, NULL);
144     if(jniEnv == NULL) {
145         jniEnv = env;
146     }
147     return getString(address_id);
148 }
149
150 jstring
151 Java_com_panasonic_communicationtest_ParameterSettingFragment_setStringIntoJNI( JNIEnv* env, jobject thiz, jstring address )
152 {
153     const char* address_id = (*env)->GetStringUTFChars(env, address, NULL);
154     if(jniEnv == NULL) {
155         jniEnv = env;
156     }
157     return setString(address_id);
158 }

JNI C代码

 1 extern long readSerialData(long devFd, unsigned char unitno, unsigned short addr, long *data, long timeout, unsigned char* rcmdReq, unsigned char* rcmdRes)
 2 {
 3     /*
 4      * Test by fansen
 5      */
 6
 7     *data = 1;
 8     int m = 0;
 9     int n = 0;
10     unsigned char test[10] = "0123456789";    //{0xff,0x1f,0x07,0x08};
11     strcpy(rcmdReq, test);
12
13 //    rcmdReq = test;
14 //    for(m = 0; m <= 8; m++){
15 //        rcmdReq[m] = test[m];
16 //        LOGI("test1: %c", test[m]);
17 //    }
18
19     LOGI(rcmdReq);
20
21
22 //    char test2[10] = {0xff,0x1f,0x07,0x08,0x00,0x87,0x00,0x01};
23 //    __android_log_print(ANDROID_LOG_INFO, "ComTest", "Communication Test 2");
24 //    for(n = 0; n <= 9; n++){
25 //        rcmdReq[n] = test2[n];
26 //    }
27
28     return OK;
29
30     /*
31      * Test over
32      */