C++. Change HEX in binary file?

Question

C++ / C#

Hello.
I found a similar question on stackoverflow - https://stackoverflow.com/questions/25625115/cpp-b...
But I didn't quite understand how to do it, that's why I'm asking a question.
I also want to note the difference between the questions: that question is only reading, and I need to know how to write as well.
Below is a screenshot of the HEX text. It's not a binary file, but that's not the point. I have highlighted what I need to change and I have highlighted WHAT I need to change.

https://imgur.com/a/iLX06Q0

There is this code from stackoverflow:

#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

int main() {
    vector<unsigned char> bytes1{0x70, 0x72, 0x69, 0x76, 0x61, 0x74};
    ofstream outfile("program1.cs", std::ios::binary);
    outfile.write((char*)&bytes1[0], bytes1.size());
    outfile.close();

    vector<unsigned char> bytes2(bytes1.size(), 0);
    ifstream infile("program1.cs", ios::in | ios::binary);
    infile.read((char*)&bytes2[0], bytes2.size());
    for (int i = 0; i < bytes2.size(); ++i) {
        printf("%02X ", bytes2[i]);
    }

    getchar();
}

PS: I have already replaced the bytes I needed from the screenshots in the bytes1 vector.
I will be grateful for any help!

Answer 1

Everything just go to the position of the text (dares the first letter) and write - it will be written over this text, but you need to check that the number of bytes written is no more than what needs to be changed.