android - JNI c语言里的char数组怎么转成java的char数组？

Question

java的实体里定义的char[] name JNI定义结构体属性char[] name将结构体属性值（中文）传给java是乱码，怎么解决？不要让我改变属性类型！

Answer 1

Please refer to this article

You must first figure out what the codes are on both sides.

Answer 2

The char[] string in C is UTF-8 encoded by default. You can use the NewStringUTF() function of JNIEnv to convert the char[] string in C to a Java string. The signature of this function is:

jstring NewStringUTF(const char* bytes)

Answer 3

Look at the simplest example:

JNIEXPORT jstring JNICALL Java_com_example_gnaix_ndk_NativeMethod_getString
        (JNIEnv *env, jclass object, jstring str){

    //1. 将unicode编码的java字符串转换成C风格字符串
    const char *buf_name = env->GetStringUTFChars(str, 0);
    if(buf_name == NULL){
        return NULL;
    }
    int len = strlen(buf_name);
    char n_name[len];
    strcpy(n_name, buf_name);

    //2. 释放内存
    env->ReleaseStringUTFChars(str, buf_name);

    //3. 处理 n_name="ro.serialno"
    char buf[1024];
    __system_property_get(n_name, buf);
    LOGD("serialno : %s", buf);

    //4. 去掉尾部"rrreee"
    int len_buf = strlen(buf);
    string result(buf, len_buf);

    return env->NewStringUTF(result.c_str());
}