📄 shop.cpp

📁 《c＋＋大学教程》源码
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// Fig. 16.22: shop.cpp
// Program to display available books.
#include <iostream>

using std::cerr;
using std::cout;
using std::cin;
using std::ios;

#include <istream>

#include <fstream>

using std::ifstream;
using std::ofstream;

#include <string>

using std::string;

#include <cstdlib>

void header();

int main()
{
   // variables to store product information
   char book[ 50 ] = "";
   char year[ 50 ] = "";
   char isbn[ 50 ] = "";
   char price[ 50 ] = "";
   
   string bookString = "";
   string yearString = "";
   string isbnString = "";
   string priceString = "";

   bool nameTaken = false;

   // open file for input
   ifstream userData( "catalog.txt", ios::in );

   // file could not be opened
   if ( !userData ) {
      cerr << "Could not open database.";
      exit( 1 );
   } // end if
   
   header(); // output header
   
   // output available books
   cout << "<center><br/>Books available for sale<br/>"
        << "<a href=\"/cgi-bin/logout.cgi\">Sign Out"
        << "</a><br/><br/>"
        << "<table border = \"1\" cellpadding = \"7\" >";
   
   // file is open
   while ( userData ) {
      
      // retrieve data from file
      userData.getline( book, 50 );
      bookString = book;

      userData.getline( year, 50 );
      yearString = year;

      userData.getline( isbn, 50 );
      isbnString = isbn;

      userData.getline( price, 50 );
      priceString = price;
      
      cout << "<tr>"
           << "<td>" << bookString << "</td>"
           << "<td>" << yearString << "</td>"
           << "<td>" << isbnString << "</td>"
           << "<td>" << priceString << "</td>";
           
      // file is still open after reads
      if ( userData ) 
         
         // output form with buy button
         cout << "<td><form method=\"post\" "
              << "action=\"/cgi-bin/viewcart.cgi\">"
              << "<input type=\"hidden\" name=\"add\""
              << "value=\"true\"/>"
              << "<input type=\"hidden\" name=\"isbn\""
              << "value=\"" << isbnString << "\"/>"
              << "<input type=\"submit\""
              << "value=\"Buy\"/>\n"
              << "</form></td>\n";

      cout << "</tr>\n";

   } // end while
   
   cout << "</table></center></body></html>";
   return 0;
}

// function to output header information
void header()
{
   // output header
   cout << "Content-type: text/html\n\n";
   
   // output XML declaration and DOCTYPE
   cout << "<?xml version = \"1.0\"?>"
        << "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 "
        << "Transitional//EN\" \"http://www.w3.org/TR/xhtml1"
        << "/DTD/xhtml1-transitional.dtd\">";

   // output html element and some of its contents
   cout << "<html xmlns = \"http://www.w3.org/1999/xhtml\">"
        << "<head><title>Login Page</title></head>"
        << "<body>";
} // end header

/**************************************************************************
 * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice      *
 * Hall. All Rights Reserved.                                             *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 *************************************************************************/
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