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Convert array of uint8_t (uint8_t*) to string in C++ [3 methods]

C++

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In this article, we have presented different ways to convert an array of uint8_t (uint8_t*) to string in C++.

Table of contents:

  1. Introduction to array of uint8_t (uint8_t*) and string
  2. Approach 1: Explicit Casting
  3. Approach 2: reinterpret_cast
  4. Approach 3: ostringstream

Introduction to array of uint8_t (uint8_t*) and string

uint8_t is a typedef for char so the compiler treats it as an ASCII character. The size of uint8_t is 8 bits (1 byte) and the size of char is same (1 byte).

String is a special datatype in C++ and is equivalent to an array of characters that is char*.

In this case, we are converting array of uint8_t that is uint8_t*. So, uint8_t* is equivalent to char* or string.

Approach 1: Explicit Casting

As uint8 and char are same, so an array of uint8_t can be converted to an array of char just by casting. Once we get an array of char, assigning it to a string completes the conversion.

uint8_t* input = {12, 1, 65, 90};
char* input2 = (char *) input;
string input3 = input2;

Following is the complete C++ code using explicit casting:

#include <stdlib.h>

int main() {
  uint8_t* input = {12, 1, 65, 90};
  char* input2 = (char *) input;
  string input3 = input2;
  return 0;
}

Approach 2: reinterpret_cast

As alternative to explicit casting will be to use reinterpret_cast.

uint8_t* input = {12, 1, 65, 90};
std::string str = reinterpret_cast<char *>(input);

Following is the complete C++ code using reinterpret_cast:

#include <stdlib.h>

int main() {
  uint8_t* input = {12, 1, 65, 90};
  std::string str = reinterpret_cast<char *>(input);
  return 0;
}

Approach 3: ostringstream

ostringstream is a builder where each element from the uint8_t array is appended one by one. Following it, calling the str() method of ostringstream returns the string.

uint8_t* input = {12, 1, 65, 90};
std::ostringstream convert;
for (int i = 0; i < 4; i++) {
    convert << (int)input[i];
}
std::string key_string = convert.str();

Following is the complete C++ code using ostringstream:

#include <stdlib.h>

int main() {
  uint8_t* input = {12, 1, 65, 90};
  std::ostringstream convert;
  for (int i = 0; i < 4; i++) {
      convert << (int)input[i];
  }
  std::string key_string = convert.str();
  return 0;
}

With this article at OpenGenus, you must have the complete idea of how to convert array of uint8_t (uint8_t*) to string in C++.

Geoffrey Ziskovin

Geoffrey Ziskovin

Geoffrey Ziskovin is an American Software Developer and Author with an experience of over 30 years. He started his career with Haskell and has interviewed over 700 candidates for Fortune 500 companies

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Convert array of uint8_t (uint8_t*) to string in C++ [3 methods]
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