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[C] Converting Hex String to Hex DWORD - Printable Version

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Converting Hex String to Hex DWORD - unknown2me - Jan 18, 2015

I've tried possibly everything.

e.g. string = "0x1337";
I'll use strtol or strtoul to convert the string to DWORD but I get the decimal equivalent. I've also tried using std::hex but DWORD is assigned the decimal value.

String = "0x1337", DWORD =4919

I want DWORD to = 1337


(Needed for RPM)

* - Mr. Dr. Prof. Patrick - Jan 18, 2015

just create your own atoi function... this thread and the one below it.. they worry me...cmon these things are super simple

* - Nichole - Jan 18, 2015

It's all binary data. How you display that data is up to you.

Code
int x = 4919;
printf("0x%X\n",x);//Prints 0x1337
printf("%i\n",x);//Prints 4919


* - unknown2me - Jan 18, 2015

(Jan 18, 2015 08:03 AM)Nichole Wrote:  It's all binary data. How you display that data is up to you.

Code
int x = 4919;
printf("0x%X\n",x);//Prints 0x1337
printf("%i\n",x);//Prints 4919

Need to store it in DWORD variable to be used further via ReadProcessMemory

* - Nichole - Jan 18, 2015

(Jan 18, 2015 08:12 AM)unknown2me Wrote:  Need to store it in DWORD variable to be used further via ReadProcessMemory

A DWORD is just a typedef for unsigned long..
Code
DWORD dwVar = 0x1337;


* - unknown2me - Jan 18, 2015

(Jan 18, 2015 08:14 AM)Nichole Wrote:  A DWORD is just a typedef for unsigned long..
Code
DWORD dwVar = 0x1337;

I'm aware... But i'm trying to make my DwORD = "0x1337" via the string

not assigning the value itself.

* - Kenshin13 - Jan 18, 2015

There's an old deprecated function called "itoa" you could use.

http://www.cplusplus.com/reference/cstdlib/itoa/

* - Nichole - Jan 18, 2015

(Jan 18, 2015 09:02 AM)unknown2me Wrote:  I'm aware... But i'm trying to make my DwORD = "0x1337" via the string

not assigning the value itself.

0x1337 is just a binary number in base 16.
4919 Is just a binary number in base 10.
0001001100110111 is just a binary number in base 2.

Code
int main()
{

    char* szVal = "0x1337";
    DWORD dwVal = 0;

    printf("%s\n",szVal);

    dwVal = strtol(szVal,0,0);

    printf("%i\t0x%X\n",dwVal,dwVal);

    return 0;
}

Edit: Minor change on the base 2.

* - g4143 - Jan 18, 2015

Did you try something like this?

Code
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char** argv) {

    char * str = "0x56f67";

    long int ans = strtol(str, NULL, 16);

    fprintf(stdout, "ans->%d\n", ans);

    return (EXIT_SUCCESS);
}


* - rooot - Jan 18, 2015

Considering it's a string. 0x1337 is ASCII. Convert the ASCII representation to Binary then Binary into Hex.

Which isn't hard at all.

Considering Binary is base 2, 11011 in binary would be 27 (Base 10)
Considering 4 bits are a representation of a 'char' let's split this up. 0001|1011 (leading zeros)
1011 = 11
1 = 1 so 0x1B

* - unknown2me - Jan 18, 2015

Think I'm being misunderstood. I need to take the value FROM the string and then ASSIGN the value to DWORD.

String value = "0x1337"; //Value wont be assigned like this
DWORD importValue;

I don't want to print the value; I want to assign it to my DWORD variable.

* - 0xDEAD10CC - Jan 18, 2015

Is this C or C++? Everyone above seemed to assume that it was C yet none of that was even specified. Here's how you get the value of 1337 from the hex string "0x1337" into a DWORD variable in C++:
Code
#include <iostream>
#include <windows.h>
#include <sstream>

int main()
{
  DWORD val;
  char str[] = "0x1337"; // DWORD = 4919
  std::istringstream isstrm(str+2);
  isstrm >> val; // provide check for success/failure here
  std::cout << val << '\n'; // value = 1337
}

If you want the hexadecimal value itself to be stored in the dword (4919 (which is the same as 0x1337) and not 1337 (in decimal)) then:
Code
#include <iostream>
#include <windows.h>
#include <sstream>

int main()
{
  DWORD val;
  char str[] = "0x1337"; // DWORD = 4919
  std::istringstream isstrm(str);
  isstrm >> std::hex >> val;
  std::cout << val << '\n'; // value = 4919
}


* - rooot - Jan 18, 2015

^0xDEAD is it just me or are you guys purposely fucking around with those code tags?
It seems to me they have weird characters. I can view the code when i'm quoting.

* - 0xDEAD10CC - Jan 18, 2015

(Jan 18, 2015 11:58 AM)rooot Wrote:  ^0xDEAD is it just me or are you guys purposely fucking around with those code tags?
It seems to me they have weird characters. I can view the code when i'm quoting.

It's just you unless you don't understand C++ syntax.. Reinstall or try another browser.

* - rooot - Jan 18, 2015

(Jan 18, 2015 02:02 PM)0xDEAD10CC Wrote:  It's just you unless you don't understand C++ syntax.. Reinstall or try another browser.

It's weird, it was doing it in incognito mode. I guess it was the browser. It was completely as if you guys were trolling OP. Seemed quite funny until i hit 'quote' and realized it was the browser