How to delete all lines and words from a text file up until a certain point - c++

Question

The problem I have is that I have a text file which contains a whole load of rubbish and just at the bottom are a few lines which holds the information I need. I want to be able to delete all the rubbish and just keep the useful information.
Iam hoping i can attach the text file which can explain it better.
There is a specific post which is relevant to this post that I am doing, however I have followed it and it hasn’t solved the problem I have. I have tried arrays and many other things, it just hasn’t worked.
it has information like this in it
|83Ïú¯–ŸªÖ!
just at the bottom of the text file it has this
000---------
i want to keep everything after the 000 and the rest of it i want to remove.

Answer 1

Open the original file for reading.
std::ifstream fin(orig_filename, std::ios::binary);
Open a new temporary file for writing in the same directory
std::ofstream fout(temp_filename, std::ios::binary);
Search for the marker pattern in the original file:
std::string marker = "000---------";
auto it =
std::search(std::istreambuf_iterator<char>(fin),
std::istreambuf_iterator<char>(), marker.begin(), marker.end());
Copy the rest from fin to fout (if the pattern was found):
if(it == std::istreambuf_iterator<char>()) {
std::cout << "pattern " << marker << " not found\n";
} else {
// the iterator "it" is now at the last char in the marker pattern,
// step over it and copy the rest to fout
std::copy(++it, std::istreambuf_iterator<char>(),
std::ostreambuf_iterator<char>(fout));
}
Rename the temporary file to the same name as the original file:
std::rename(temp_filename, orig_filename);
Note: Opening the files in std::ios::binary mode is afaik only needed on Windows.