C++ File Handling seekp() Function














































C++ File Handling seekp() Function



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

The seekp(pos) method of ostream in C++ is used to set the position of the pointer in the output sequence with the specified position. This method takes the new position to be set and returns this ostream instance with the position set to the specified new position.

               Syntax

     (1) ostream& seekp (streampos pos);
    (2) ostream& seekp (streamoff off, ios_base::seekdir way);

       Parameter

      pos - It is used to find absolute position within the stream

         off -Offset value, relative to the way parameter.

   
       Return Value

      It returns the ostream object (*this).


          Excpetions

 If the operation sets an internal state flag  that was registered with member exceptions, the function throws an exception of member type failure.

 

          Example


#include <fstream>

int main () {

std
::ofstream outfile;
outfile
.open ("cppsecret.txt");

outfile
.write ("This is an cpp site",19);
long pos = outfile.tellp();
outfile
.seekp (pos-7);
outfile
.write (" win",4);

outfile
.close();

return 0;
}







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