Get position of the
get pointer
.
Returns the position of the
get pointer
. The
get pointer
determines the next location
to be read in the buffer associated to the input stream.
Parameters.
The function returns an object of type
streampos
describing the current position of the get pointer in the stream.
Example.
// read a file into memory
#include <iostream>
#include <fstream>
using namespace std;
int main () {
int length;
char * buffer;
ifstream is;
is.open ("test.txt", ios::binary );
// get length of file:
is.seekg (0, ios::end);
length = is.tellg();
is.seekg (0, ios::beg);
// allocate memory:
buffer = new char [length];
// read data as a block:
is.read (buffer,length);
is.close();
cout.write (buffer,length);
return 0;
In this example
tellg
is used to get the offset of the last
character in the stream, determining thus the size of the file.
Basic template member declaration (
basic_istream<charT,traits>
):
typedef traits::pos_type pos_type;
pos_type tellg ();
