Hi,

Could anyone please help me in writing code to convert Hex Values to ASCII

Thanks

tell me this... is the following code correct?

#include <iostream>
using namespace std;

int main () {
  int n;
  n=48:45:4c:4c:4f:20:57:4f:52:4c:44;
  cout << "ASC " << n << endl 
  return 0;
}

tell me this... is the following code correct?

#include <iostream>
using namespace std;

int main () {
  int n;
  n=48:45:4c:4c:4f:20:57:4f:52:4c:44;
  cout << "ASC " << n << endl 
  return 0;
}

Is this a trick question? Of course it's not correct, as any compiler will tell you. How about explaining exactly what output you were expecting from this code, and I'll tell you how to achieve it correctly.

Is this a trick question? Of course it's not correct, as any compiler will tell you. How about explaining exactly what output you were expecting from this code, and I'll tell you how to achieve it correctly.

I am getting a hex values as my output and i want to convert it into ascii so that it is readable.. does this help you?

First off, there's no such thing as a 'hex value'; there are binary values, some of which represent numeric values and some of which represent character encodings. I presume what you want is to display a binary numeric value in a character string as a hexadecimal number.

Let's start with the numeric value itself. given the size of the number you seem to have, and the way you've shown it in you earlier attempt to explicate your intentions, I assume that what you're working with is a 128-bit value (your value used 11 bytes, which means that it won't fit in anything less than 88 bits). Unfortunately, there are no standard C++ variable types that large. You'll need at least two long long variables in a structure or an array, assuming your compiler supports that type; otherwise, you need four 32-bit int variables to hold it.

Just out of curiosity, could you tell us what this is supposed to represent? My initial impression was that it was an IPv6 address, but if so, you wrote it incorrectly (IPv6 addresses are written with sections of two bytes, with leading zeroes elided, so it would have been 4845:4c4c:4f20:574f:524c:44:: or something similar - because there are less than 16 bytes, and you only gave the actual hex values, it's hard to say where the zeroes would go).

Anyway... to print out a numeric value in hex, you simply use the hex manipulator with the output stream before the number to be printed:

cout << hex << n[3] << n[2] << n[1] << n[0] << endl;

Note that the order which you need to print it is system-dependent.

Edited 4 Years Ago by Schol-R-LEA: n/a

Actually, what I think you want will be individual ASCII character values.
If you split up that (string?) data you posted into individual characters (even in HEX), you won't need to do any real conversion -- just output them as chars.

#include <iostream>
using namespace std;

int main(void)
{
   char arr_chr[] = {0x48, 0x45, 0x4c, 0x4c, 0x4f, 0x20, 0x57, 0x4f, 0x52, 0x4c, 0x44, 0x00};

   for (int i=0; 0 != arr_chr[i]; i++)
   {
      //print individual characters here;
   }

   return 0;
}
Comments
I should have noticed that before. The string in question is "Hello, World".

I am getting a hex values as my output and i want to convert it into ascii so that it is readable.. does this help you?

No, it doesn't. Your terminology is confused, which makes it very difficult to understand exactly what you want without specific examples. Please post the exact output you want to see, since you're clearly not describing the problem adequately.

If that input data is actually a STRING, then you would need to parse it (based either on colons or spaces if you convert the colons to spaces).

There might be an easier way, but here is a conversion of the STRING with the colons converted to spaces:

/*
#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
*/
   ///////////////////////////////////////////////////////////////////////
   // Use the istringstream to parse the data (now containing spaces)
   string strHex = "0123456789ABCDEF";  //base characters for hex conversion
   string strData="";
   istringstream iss("48 45 4c 4c 4f 20 57 4f 52 4c 44");
   while(iss >> strData)
   {
      ////////////////////////////////////////////////////////////////////
      // First byte's offset times 16 added to second byte's offset
      cout << (char)
         ((strHex.find(toupper(strData[0]))*16) +
            (strHex.find(toupper(strData[1]))));
   }

Another way to say what Narue said is: programming is an exercise in precision. It's nearly impossible to program something until you can think about it (and thus speak about it) precisely. And once you can think about the problem precisely, the code virtually writes itself. Learning to program is, first and foremost, teaching yourself to think precisely. Start there, and work forwards: what is your input (integer or string of colon-separated hex characters) and what output do you expect to get as a result of your program? Is there some intermediate format you need, between the input and output? What format is that, what will it be used for, and above all, is it needed at all?

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