CODEWITHSUNDEEP
c++file
Revant
Revant

Reputation: 29

How to delete the contents of a file using C++

I am making a program where I would like to check the first line of a .txt file for a specific string. If that string is tampered with or does not exist I would like to delete the content of the entire file to prevent tampering with the file. I know that it is possible to delete the contents of the file when opening it, but I cannot find a way to do so after checking the first line.

getline(infile, fLine);
cout<<fLine<<"\n";

if(fLine != "Line One"){
  infile.clear();
  outfile << "Line One\n";
  }

Upvotes: 0

Views: 3212

Answers (1)

Fantastic Mr Fox
Fantastic Mr Fox

Reputation: 33954

Just write nothing to the file by truncating it:

infile.close()
infile.open("file.txt", fstream::out | fstream::trunc);
infile.close()

note that this implementation will depend on your declaration of infile. If it is an ifstream you will need to do this:

ofstream outfile;
outfile.open("file.txt", ofstream::out | ofstream::trunc);
outfile.close()

Upvotes: 4

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