C++ File Handling tellg() Function














































C++ File Handling tellg() Function



In the previous article we have discuss about tellp() Function.If you have not gone through it you see through this link tellp(). In continuation of the previous article we will learn more about tellp() function in this article.

              Introduction to tellg() Function in C++

The tellg() function is used with input streams, and returns the current "get" position of the pointer in the stream. It has no parameters and returns a value of the member type pos_type, which is an integer data type representing the current position of the get stream pointer.
  
              Syntax
      
   pos_type tellg();

   Returns: The current position of the get pointer on success, pos_type(-1) on failure.

        Parameters

           

          none

        

        Exceptions


Basic guarantee - if an exception is thrown, the object is in a valid state.

     

        Data races

Modifies the stream object.


     Example


In below example for std::basic_istream::tellg.

#include <iostream>     
#include <fstream>

int main () {
std
::ifstream is ("cppsecrets.txt", std::ifstream::binary);
if (is) {

is.seekg (0, is.end);
int length = is.tellg();
is.seekg (0, is.beg);

char * buffer = new char [length];

is.read (buffer,length);
is.close();

std
::cout.write (buffer,length);

delete[] buffer;
}
return 0;
}


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