CODEWITHSUNDEEP
carraysstringhex
Ehsanur
Ehsanur

Reputation: 21

How to convert array of uint8_t values to hex dump char string in C

I want to convert byte array uint8_t Hexadecimal values to char array string (**same values not ASCII) and then simple print this string array as below:

input:

uint8_t myarr[4]={0x11,0x12,0x33,0x1A}

output:

 1112331A

Simple char array string not hexadecimal array string.

Upvotes: 1

Views: 2550

Answers (2)

Lundin
Lundin

Reputation: 215090

The old school way of raw data to ASCII hex conversion, is to use a look-up table based on nibbles:

#include <stdint.h>
#include <stdio.h>

int main (void)
{
  uint8_t myarr[4]={0x11,0x12,0x33,0x1A};
  char hexstr[4][2+1] = {0};

  const char HEX [16] = "0123456789ABCDEF";
  for(size_t i=0; i<4; i++)
  {
    hexstr[i][0] =  HEX[ (myarr[i] & 0xF0) >> 4 ];
    hexstr[i][1] =  HEX[ (myarr[i] & 0x0F) ];
    puts(hexstr[i]);
  }
}

Upvotes: 2

Some programmer dude
Some programmer dude

Reputation: 409442

Just loop over the elements of the array and use printf to print each element using the "%hhx" format specifier.

Also note that the values will not be stored as hexadecimal. Hexadecimal is just a form to present values.

Upvotes: 7

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