(C++) std::fseek

 

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.

 

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#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()); }