file minpulation

hi everybody


i am looking for a way to modify FILE (binary/HEX) representation.

what i mean is :

when you write an 'a' into a file

then open the same file using any hexEditors

then you will find number 61 Hex which is equal to 97 Dec

and both are the number that equal to 'a' in the ASCII table


-******************************-
so what i need to write 'a'
is to write 61 Hex to a file

and this what i want to do using c++




thanks

What have you done so far?

--
Mats

nothing to be mentioned

with the normal <iostream>

i can not do anything more.

To the computer, numbers and characters aren't any different, nor are hexadecimal and decimal. In the end, it comes down to numbers stored in memory in binary form, and everything else is a matter of interpretation.

Write an 'a' to a file or write the number 97, there's no difference. The difference appears only when you use a text editor or a hex editor to open the file.

silly me

so the question will be changed

*************

how could i write one of the special characters to my file ?

since i do not know how to write them using my keyboard

You can write anything to a file as long as you can represent it numerically - although you will need to specify:

Code:

---

ios::binary

---

The whole line may look something like this:

Code:

---

ofstream myfile ("example.bin", ios::out | ios::app | ios::binary);

---

as a flag when you open the file if you don't want the certain combinations to be "changed", (such as if you open a file on Windows, it adds a '\r' when you output a '\n').

More info here:
http://www.cplusplus.com/doc/tutorial/files.html

--
Mats

thanks