/* Filename:  readpart.cpp

   Author:  Br. David Carlson

   Date:  February 23, 1998

   Last Revised:  February 21, 2013

   This program reads a binary file (named parts.dat) of parts records,
   displaying the info on the screen.  The data for each record consists
   of an ID number, number in stock, price, and description.  See the
   related program makepart.cpp as a way to create a parts.dat file.

   Warning: this simple program does not contain anything to pause the
   scrolling of the output on the screen.

   Tested with:
      Microsoft Visual C++ 2008
      g++ under Linux
*/

// iostream is indirectly included through parts.h
#include <fstream>   // needed for files
#include "parts.h"  // needed for PartType

void ReadFile(fstream & fs);


int main(void)
   {
   fstream PartFile;

   PartFile.open("parts.dat", ios::in | ios::binary);
   if (PartFile.fail())
      {
      cerr << "Could not open file parts.dat" << endl;
      exit(1);
      }

   ReadFile(PartFile);
   PartFile.close();
   return 0;
   }


/* Given:   fs   A binary file stream already opened for input.
   Task:    To read parts data from fs, writing it onto the screen.
   Return:  fs   The modified file stream.
*/
void ReadFile(fstream & fs)
   {
   int RecordSize;
   PartType Part;

   RecordSize = sizeof(Part);
   // Read the first record from the file:
   fs.read(reinterpret_cast <char *> (&Part), RecordSize);

   while (! fs.fail())
      {
      // Write data from Part onto the screen:
      cout << "ID: " << Part.ID << endl;
      cout << "Number in stock: " << Part.NumInStock << endl;
      cout << "Price: " << Part.Price << endl;
      cout << Part.Descrip << endl << endl;

      // Read the next record from the file:
      fs.read(reinterpret_cast <char *> (&Part), RecordSize);
      }
   }