Uppercase Hex

I am trying to output some hex values into a file. Every way i try to make the hex letters uppercase just puts 200 infront of the values and doesnt capitalize it...

Code:

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#include <iostream.h>
#include <fstream.h>

unsigned char Memory[0xFFF];
unsigned short OpCode;

void LoadRom(char *sFileName)
{
  ifstream Rom(sFileName);

  if(!Rom.is_open()) {
    cout << "Error Opening " << sFileName;
    exit(1);
  }

  long Start = Rom.tellg();
  Rom.seekg(0, ios::end);
  long End = Rom.tellg();
  Rom.seekg(0, ios::beg);
  long FileSize = End - Start;

  Rom.read(Memory, FileSize);

  Rom.close();
}

void WriteFile(char *sFileName)
{
  ofstream Log(sFileName, ios::app);

  if(!Log.is_open()) {
    cout << "Error Opening " << sFileName;
    exit(1);
  }

  for(int loop = 0x000; loop < 0xFFF; loop+=2) {
    OpCode = (Memory[loop] << 8) + Memory[loop + 1];
    Log << hex;
    Log << "0x" << OpCode << endl;
  }

  Log.close();
}

int main()
{
  char sFileName[80];

  cout << endl;
  cout << "Chip8 DisAssem" << endl;
  cout << "--------------------" << endl << endl;
  cout << "Enter Rom Name: ";
  cin  >> sFileName;

  LoadRom(sFileName);

  cout << "Writing...";

  WriteFile("Asm.txt");

  cout << endl;
  return 0;
}

---

How can I make the hex letters uppercase?

Maybe take a look at C++ I/O Flags?

I know "how" to set uppercase... but when I do.. it doesnt...
All it does is either

a) messes up the values
b) Adds 200 to every line....

!?!?! its freaking me out

Code:

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    Log << hex << uppercase << "0x" << OpCode << endl;

---

ok...

Code:

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Log << hex << ios::uppercase << "0x" << OpCode << endl;

---

then in the "log" file its

2000x6e05

I want it to be

0x6E05

That 200 only goes there if i do the ios::uppercase

edit: My compiler(gcc/Dev-C++) wont accept just uppercase... it has to be ios::uppercase.

>ios::uppercase

You don't want the ios:: there, just uppercase. ios::uppercase outputs the value of the ios::uppercase flag, which apparently is 200 hex. ios::uppercase is used with the setf() or setiosflags() function:
cout.setf(ios::uppercase);

Ah, thank you :)

One more thing...

How can I stop it from dropping 0's off the end of the values.

like if the value is 0xEE00 it prints 0xEE, how can I save my zero's!

Quote:

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like if the value is 0xEE00 it prints 0xEE, how can I save my zero's!

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You are writing the file with one byte per line, so why would you want those zeros there? A hex byte only has 2 digits, so the value will never be 0xEE00.

Something like this?

Code:

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    Log << hex << uppercase << "0x" << setfill('0') << setw(4) << OpCode << endl;

---

The local fstream tutorial isn't exactly indepth on i/o stream functions. So while I was still stuck with getch(ch), I wrote this function:

Code:

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string itox( unsigned int i )
{
        char x[7] = "000000";
        int j = 0;
       
        // lookup table
        const char xtable[17] = "0123456789ABCDEF";

        // Get hex from int
        for (j = 6; (j >= 0) && i; j--)
        {
                x[j] = xtable[i & 0xF];
                i = i >> 4;
        }

        return x;
}

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It can easily be modified to output more or less digits, or even a completely different base system. Maybe even a dynamic base system...

Quote:

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so the value will never be 0xEE00.

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Yes, but if you look carefuly, each "value" im writing to the file is compose of two bytes.

This program is takin a Chip8 rom and writing the instructions out into a log file. Each instruction is 2 bytes long.

Well, 0xEE == 0x00EE, as opposed to 0xEE00.

yeah 0x00EE... didnt i say that :p