Concatenate unsigned char[] value and convert to char *

Question

I'm using Java NDK in order to extract some info from a "bin" file using a C struct. I have to extract info about a gateway, in for loop. I'm able to extract info, but I need to concatenate the results and add dot . in order to print the final IP and convert it to char* or string. I used reinterpret_cast but it doesn't work.

How can I convert the IP address to a string?

#define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)

//Gateway.info[4] is unsigned char type
int config_len = sizeof(ptr->Gateway.info);
for (int i = 0; i < config_len; i++) {
    int number = ptr->Gateway.info[i];

}
LOGD("GATEWAY %d",number);

---

Answer 1

I made a mistake. It works!

#define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)


string Result; 
ostringstream convert;

//Gateway.info[4] is unsigned char type
int config_len = sizeof(ptr->Gateway.info);
for (int i = 0; i < config_len; i++) {
    int number = ptr->Gateway.info[i];
    convert << number; 
    Result = convert.str()

}