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C++ basic_ios Library - seekg
Description
It is used to set position in input sequence.
Declaration
Following is the declaration for std::basic_istream::seekg.
(1) basic_istream& seekg (pos_type pos); (2) basic_istream& seekg (off_type off, ios_base::seekdir way);
Parameters
pos − New absolute position within the stream (relative to the beginning).
off − Offset value, relative to the way parameter.
way − Object of type ios_base::seekdir.
Return Value
Returns the basic_istream object (*this).
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::seekg.
#include <iostream> #include <fstream> int main () { std::ifstream is ("test.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; }
istream.htm
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