In C + + random access (random access) stream (stream) detailed

Random access Flow, using mark (Mark) to mark the location of the stream, contains two methods of tell and seek;

Tell, which is the return stream Mark's location, contains G and P two versions. g denotes get, refers to the input stream; P means put, the output stream;

Seek is a jump to the position indicated by the stream mark, and also contains G and P two versions; seek can specify a location or offset (offset);

The code is as follows:

* * * cppprimer.cpp * * Created on:2013.11.28 * author:caroline//*eclipse CDT, gcc 4.8.1*/  
      
#include <iostream> #include <fstream> #include <cstdlib> using namespace std;  
    int main () {Std::fstream inOut ("Copyout", std::fstream::ate/* end * * | std::fstream::in | std::fstream::out);  
        if (!inout) {Std::cerr << "unable to open file!" << Std::endl;  
    return exit_failure;  
    Std::fstream::p os_type end_mark = Inout.tellg (); INOUT.SEEKG (0, Std::fstream::beg);  
    Reposition at the beginning of the std::size_t CNT (0);  
    Std::string Line; while (InOut && inout.tellg ()!= end_mark && getline (InOut, line)) {cnt =  
        Line.size () + 1; Std::fstream::p os_type mark = Inout.tellg (); Remember the current position INOUT.SEEKP (0, Std::fstream::end);  
        Skip to end InOut << CNT; if (Mark!= end_mark) inOut << ""; In addition to the last line,are written to space inout.seekg (mark);  
    Back to the record location} INOUT.SEEKP (0, Std::fstream::end);  
    InOut << "\ n";  
return 0; }

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Output (text):

Caroline  
Wendy  
Spike  
Winny  
9 12 16 21

Author: csdn Blog spike_king