IOS:Convert string to hexadecimal array

IOS:Convert string to hexadecimal array

By : Thanh Phương
Date : November 18 2020, 11:13 AM
I hope this helps you . Byte[] class is an array of characters. I mean you can only set one character at it's index.
If we have
code :
NSString *stringsdata=@"helloworld1234567812345q";
    CFStringRef cfString = (__bridge CFStringRef)stringsdata;
    char *array = charArrayFromCFStringRef(cfString);
    size_t length= strlen(array);

    Byte comm[24];
    for (int i = 0; i < length; i++) {
        comm[i] = array[i];
char * charArrayFromCFStringRef(CFStringRef stringRef) {
    if (stringRef == NULL) {
        return NULL;

    CFIndex length = CFStringGetLength(stringRef);
    CFIndex maxSize = CFStringGetMaximumSizeForEncoding(length, kCFStringEncodingUTF8);

    char *buffer = (char *)malloc(maxSize);
    if (CFStringGetCString(stringRef, buffer, maxSize, kCFStringEncodingUTF8)) {
        return buffer;
    return NULL;
Printing description of comm:
(Byte [24]) comm = {
  [0] = 'h'
  [1] = 'e'
  [2] = 'l'
  [3] = 'l'
  [4] = 'o'
  [5] = 'w'
  [6] = 'o'
  [7] = 'r'
  [8] = 'l'
  [9] = 'd'
  [10] = '1'
  [11] = '2'
  [12] = '3'
  [13] = '4'
  [14] = '5'
  [15] = '6'
  [16] = '7'
  [17] = '8'
  [18] = '1'
  [19] = '2'
  [20] = '3'
  [21] = '4'
  [22] = '5'
  [23] = 'q'

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How do you convert a byte array to a hexadecimal string in C?

How do you convert a byte array to a hexadecimal string in C?

By : user3188813
Date : March 29 2020, 07:55 AM
wish helps you I have:
code :
printf("%02X:%02X:%02X:%02X", buf[0], buf[1], buf[2], buf[3]);
int i;
for (i = 0; i < x; i++)
    if (i > 0) printf(":");
    printf("%02X", buf[i]);
int i;
char* buf2 = stringbuf;
char* endofbuf = stringbuf + sizeof(stringbuf);
for (i = 0; i < x; i++)
    /* i use 5 here since we are going to add at most 
       3 chars, need a space for the end '\n' and need
       a null terminator */
    if (buf2 + 5 < endofbuf)
        if (i > 0)
            buf2 += sprintf(buf2, ":");
        buf2 += sprintf(buf2, "%02X", buf[i]);
buf2 += sprintf(buf2, "\n");
Convert bytes array to Hexadecimal String

Convert bytes array to Hexadecimal String

By : Andrew Rodriguez
Date : March 29 2020, 07:55 AM
Hope this helps Use std::ostringstream:
code :
typedef std::vector<unsigned char> bytes;
std::string BytesToStr(const bytes &in)
    bytes::const_iterator from = in.cbegin();
    bytes::const_iterator to = in.cend();
    std::ostringstream oss;
    for (; from != to; ++from)
       oss << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(*from);
    return oss.str();
Convert hexadecimal number to hexadecimal string in assembly language (NASM) (debug)

Convert hexadecimal number to hexadecimal string in assembly language (NASM) (debug)

By : Tien Pham
Date : March 29 2020, 07:55 AM
I wish this help you OK, before someone else marks this question as a duplicate. Let me make this very clear that this is more of a debugging problem than a logical problem. The logic is correct as far as I know because if I individually print the value in bx register after each operation, then I get correct output. The problem is that storing the results in bx register should make changes in the memory location it holds which is not happening. , Your issue is on the two lines that look like this:
code :
mov [bx], dx
mov [bx], dl
How to convert Byte Array to Hexadecimal String in C++?

How to convert Byte Array to Hexadecimal String in C++?

By : Mohamed Dessouki
Date : March 29 2020, 07:55 AM
should help you out I am looking for a fastest way to convert a byte array of arbitrary length to a hexadecimal string. This question has been fully answered here at StackOverflow for C#. Some solutions in C++ can be found here.
Fast way to convert a hexadecimal string to hexadecimal char array

Fast way to convert a hexadecimal string to hexadecimal char array

By : Adrian Kekezi
Date : March 29 2020, 07:55 AM
To fix this issue I need to convert string which contain hexadecimal number to unsigned char array. , The fastest method is with a lookup array:
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