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C++ hex problem
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Snootae
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PostPosted: Fri Dec 18, 2009 6:23 am    Post subject: C++ hex problem Reply with quote
okay so ive got a nice little C++ console app, cin cout and all that

and what im trying to do basically is have the user input a hex values like 0x00001122 or just 00001122 using cin and have a dword store that value so it can be used to read some memory, however it does not work as it is, it seems to give a decimal value which makes the program crash when it tries to use it

any ideas? im well stuck
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tombana
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PostPosted: Fri Dec 18, 2009 10:34 am    Post subject: Reply with quote
I don't know how you are using cin, but I think you should be able to do something like:
Code:
cin >> hex >> variable;

I don't know how it would work with other cin methods like cin.get()
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hcavolsdsadgadsg
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PostPosted: Fri Dec 18, 2009 5:22 pm    Post subject: Reply with quote
the std::hex manipulator works on input as well.

set it back to std::dec if you need it back to normal.
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Snootae
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PostPosted: Fri Dec 18, 2009 8:51 pm    Post subject: Reply with quote
thanks for the help btw

ive been trying that too, heres the code


Code:
DWORD Add, Off, Value;

      cout << "Enter address: ";
      cin >> hex >> Add;
      
      cout << "Enter offset: ";
      cin >> hex >> Off;

      cout << "Reading address " << Add << " at offset " << Off << " ..." << endl;


and when i tried 000011bc and 1b3, it says reading at address 4540 at offset 435



hmmm, i tried using hex on the output aswell, it gives me the right number, but without the leading zeros, so 11bc instead of 000011bc, does that mean i could just add those zero to the front and it would work?
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Slugsnack
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PostPosted: Fri Dec 18, 2009 9:00 pm    Post subject: Reply with quote
setfill()
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lurc
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PostPosted: Fri Dec 18, 2009 9:02 pm    Post subject: Reply with quote
You could just use printf (or if you plan on having UNICODE support: _tprintf) and just set it as a pointer format flag.

Code:
_tprintf(_T("Reading address: 0x%p at offset 0x%p"), Add, Off);

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Flyte
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PostPosted: Fri Dec 18, 2009 9:04 pm    Post subject: Reply with quote
Snootae wrote:
... it gives me the right number, but without the leading zeros, so 11bc instead of 000011bc, does that mean i could just add those zero to the front and it would work?

Slugsnack wrote:
setfill()

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Snootae
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PostPosted: Fri Dec 18, 2009 9:04 pm    Post subject: Reply with quote
ah, thank you guys

so just filling up the zeros should work?

i shall do that
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Flyte
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PostPosted: Fri Dec 18, 2009 9:13 pm    Post subject: Reply with quote
Fibonacci is rolling in his grave right about now.
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Snootae
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PostPosted: Fri Dec 18, 2009 9:18 pm    Post subject: Reply with quote
im sure he doesnt have a grave, or anything left by now



on a related note im still failing at getting a stupid dword with the value
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Flyte
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PostPosted: Fri Dec 18, 2009 9:29 pm    Post subject: Reply with quote
Here is a little exercise for you.

Which number is 10?
  1. 000000000010.000000000000000
  2. 010
  3. 00000000000000000000000000000000000000000010
  4. 10
  5. All of the above.


(Yes, I'm aware if you prefix a number with 0 it is thought of as an octal... in programming. This is purely math.)
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Snootae
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PostPosted: Fri Dec 18, 2009 9:38 pm    Post subject: Reply with quote
ooooooh, d, no wait, e, no wait, e and d
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Slugsnack
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PostPosted: Fri Dec 18, 2009 9:55 pm    Post subject: Reply with quote
Code:
#include <windows.h>
#include <iomanip>
#include <iostream>
  using namespace std;

int main()
{
  DWORD Add, Off;

  cout << "Enter address: ";
  cin >> hex >> Add;
       
  cout << "Enter offset: ";
  cin >> hex >> Off;

  cout << "Reading address " << hex << setfill('0') << setw(8) << Add;
  cout << " at offset " << hex << setfill('0') << setw(8) << Off << " ..." << endl;

  return 0;
}


Despite Flyte having been given tens of thousands of dollars in scholarship money, numerous awards, and even attending a university that essentially pays him to go there, he is still full of shit. He has no interest in helping people, only showing off what little he knows.
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Flyte
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PostPosted: Fri Dec 18, 2009 10:08 pm    Post subject: Reply with quote
Slugsnack wrote:
Despite Flyte having been given tens of thousands of dollars in scholarship money, numerous awards, and even attending a university that essentially pays him to go there, he is still full of shit. He has no interest in helping people, only showing off what little he knows.


I'd argue that showing him that leading 0s do not matter, however imparted, is far more valuable than providing an answer to question he never asked. Though I'm sure you didn't realize that, since you clearly lack reading comprehension.
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Snootae
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PostPosted: Fri Dec 18, 2009 10:38 pm    Post subject: Reply with quote
im sure its your job to impart wisdom eh?
not just help with what im actually asking

thanks slugsnack
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