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Reading/Writing to Executable

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Join Date: Sep 2005

Posts: 4

Reputation: Decoder is an unknown quantity at this point

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Decoder

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Reading/Writing to Executable

Nov 7th, 2005

Hi everyone. I am working on a project which has to change the value of a variable in the executable. Specifically, writing this program:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
int a = -1;
int b = 3;
int c = a + b;
int a = -1;
int b = 3;
int c = a + b;

I have to go into the executable and change the value of "a" into the executable. Let me not extend this too much, and show you what i have done. At this moment I do not know why this is not working. I am trying to make sure that I am looking at the right place before I try to change the value. Thanks for any help you can give me.

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 C++ Syntax (Toggle Plain Text) 
#include<iostream.h>
#include<fstream>
#include<stdio.h>
#include<string>
using namespace std;
 
int main()
{
	ifstream myFile;
	ofstream fout;
	char temp1;
 
	myFile.open("C:/Documents and Settings/Angel/Desktop/Virus/Hex/Debug/Hex.exe");
 
	if ( !myFile ) //(myFile.is_open())
	{
		cout << "File could not be opened.\n";
		myFile.close();
	}
 
	else
	{
		myFile.seekg(0x0000158B); //Seeks the positon of variable a in the binary file / executable.
		myFile.read(temp1,1);
		cout << "Value is " << temp1 << endl;
		myFile.close();
	}
 
	return 0;
 
}
#include<iostream.h>
#include<fstream>
#include<stdio.h>
#include<string>
using namespace std;

int main()
{
	ifstream myFile;
	ofstream fout;
	char temp1;

	myFile.open("C:/Documents and Settings/Angel/Desktop/Virus/Hex/Debug/Hex.exe");
	
	if ( !myFile ) //(myFile.is_open())
	{
		cout << "File could not be opened.\n";
		myFile.close();
	}

	else
	{
		myFile.seekg(0x0000158B); //Seeks the positon of variable a in the binary file / executable.
		myFile.read(temp1,1);
		cout << "Value is " << temp1 << endl;
		myFile.close();
	}

	return 0;

}

<< moderator edit: added [code][/code] tags >>

Last edited by Dave Sinkula; Nov 7th, 2005 at 6:00 pm.

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