std::fseek is a function used in C-style file I/O:

std::fopen: opens a file
std::fputs: write to file
std::fseek: change position to write
std::fclose: close file

Prefer using the C++ file stream std::fstream.


#include <cassert>

#include <cstdio>

#include <boost/scoped_ptr.hpp>



//THIS PROGRAM CAUSES A RUNTIME CRASH

//IT PROBABLY CORRUPTS SOME MEMORY

//DO NOT RUN IT!

int main()

{

  //Create a file to write to

  const boost::scoped_ptr<FILE> my_file(std::fopen("my_file.txt","w"));

  //Assume the file is created successfully

  assert(my_file);

  //Put text at the start of the file

  std::fputs("Bilderbickel",my_file.get());

  //Go to the 9th position

  std::fseek(my_file.get(),9,SEEK_SET );

  //Put text at the 9th position

  std::fputs ("k",my_file.get());

  //Close the file

  std::fclose (my_file.get());

}

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(C++) std::fseek