Thread: 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:

#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?

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

ok...

Code:

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.

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:

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;
}

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

so the value will never be 0xEE00.

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