How to Construct the Exercise I (Cont.)
  1. File Processing Using C/C++ The Perl command system( LIST ) allows the host system to execute the command LIST. It is used here to call a C/C++ run file: 
       system( "./CGIDemo '$name'" );
    where

    • CGIDemo is a C/C++ run file and
    • $name is the web input.

    The CGIDemo.cpp performs the following tasks:

    1. Reads the file cartoon.txt line-by-line.
    2. Check whether the line contains a substring $name.
    3. If it does, displays the line.

    ~wenchen/public_html/cgi-bin/351/week3/CGIDemo.cpp 
    
#include  <fstream>
#include  <iostream>
#include  <cstring>
  using namespace  std;

int  main( int arc, char* argv[ ] ) {
  char     name[128]; 
  fstream  file; 
 
  file.open ( "cartoon.txt", fstream::in ); 
  while ( 1 ) { 
    file.getline( name, 128 ); 
    if ( file.eof( ) )  break; 
    if ( strstr( name, argv[1] ) != NULL ) 
      cout << "Found: <em>" << name << "</em><br />"; 
  } 
  file.close( );
}

    You may check the results on the Web. For example, if you are using the previous CGI Perl script, the results will be shown at 
      http://people.cs.und.edu/~wenchen/cgi-bin/351/week3/CGIDemo.pl