I/O Status : File Status « File « C++

1. C++
2. File
3. File Status

I/O Status

  
/*
Name                 Meaning

ios::goodbit         No error bits set

ios::eofbit          1 when end-of-file is encountered; 0 otherwise

ios::failbit         1 when a (possibly) nonfatal I/O error has occurred; 0 otherwise

ios::badbit          1 when a fatal I/O error has occurred; 0 otherwise
*/

#include <iostream>
#include <fstream>
using namespace std;
   
void checkstatus(ifstream &in);
   
int main(int argc, char *argv[])
{
  if(argc!=2) {
    cout << "Usage: Display <filename>\n";
    return 1;
  }
   
  ifstream in(argv[1]);
   
  if(!in) {
    cout << "Cannot open input file.\n";
    return 1;
  }
   
  char c;
  while(in.get(c)) {
    if(in) cout << c;
    checkstatus(in);
  }
   
  checkstatus(in);  // check final status
  in.close();
  return 0;
}
   
void checkstatus(ifstream &in)
{
  ios::iostate i;
   
  i = in.rdstate();
   
  if(i & ios::eofbit)
    cout << "EOF encountered\n";
  else if(i & ios::failbit)
    cout << "Non-Fatal I/O error\n";
  else if(i & ios::badbit)
    cout << "Fatal I/O error\n";
}
  
    
  

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