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Nov 18th, 2006
Views: 3,224
nanodano
This code snippet actually contains a few nifty things. There are two functions, hasVisited() and main(). hasVisited() makes use of a very handy function for CGI programmers: getenv. You can see I use it to retrieve REMOTE_ADDR which is the person's IP address. In main() it gets the count from a file and increments if needed and outputs back to the same file. It then outputs a simple HTML page that the user sees.
Last edited : Nov 20th, 2006.
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cplusplus Syntax
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  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4.  
  5. using namespace std;
  6.  
  7. bool hasVisited()
  8. // Figure out wether unique hit or not
  9. // Returns true if ip address has visited
  10. {
  11.   bool visited = false;
  12.   string userIP = getenv("REMOTE_ADDR");
  13.   string nonUnique;
  14.  
  15.   ifstream input("iplist.cnt");
  16.   while (input) {                   // See if IP is in list
  17.     getline(input, nonUnique);
  18.     if (userIP == nonUnique) {
  19.       visited = true;
  20.       break;
  21.     }
  22.   }
  23.   input.close();
  24.  
  25.   if (visited == false) {               // Add IP to list
  26.     ofstream output("iplist.cnt", ofstream::app);
  27.     output << userIP << endl;
  28.     output.close();
  29.   }
  30.  
  31.   return (visited);
  32. }
  33.  
  34.  
  35. int main() {
  36.   int uniqueHits;   // Default in case no counter file exists
  37.   int rawHits;
  38.  
  39.   ifstream in("counter.cnt");
  40.   if (!in) {
  41.     uniqueHits = 0;
  42.     rawHits = 0;
  43.   }
  44.   else {
  45.     in >> uniqueHits;          // 1st number = unique hits
  46.     in >> rawHits;             // 2nd number = raw hits
  47.     in.close();
  48.   }
  49.  
  50.   bool visited = hasVisited();  
  51.   rawHits++;
  52.   if (!visited)
  53.     uniqueHits++;
  54.  
  55.   ofstream out;
  56.   out.open("counter.cnt");  
  57.   out << uniqueHits << ' ' << rawHits; 
  58.   out.close();
  59.  
  60.   cout << "Content-type: text/html" << endl << endl
  61.        << "<HTML><BODY>" << endl
  62.        << "This is a hit counter written in C++. <hr>" << endl
  63.        << "Your IP address: " << getenv("REMOTE_ADDR") << ".";
  64.   if (visited) 
  65.     cout << "(Not unique)";
  66.   else
  67.     cout << "(Unique)";
  68.   cout << "<hr>" << endl
  69.        << "Unique hits: " << uniqueHits << "<br>Raw hits: " << rawHits << endl;
  70.   cout << "</BODY></HTML>" << endl;
  71. }
Comments (Newest First)
manutd | Junior Poster in Training | Nov 20th, 2006
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Welcome, my pleasure
~s.o.s~ | Rebellion Revamped | Nov 20th, 2006
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Has been taken care of, snippet modified to incorporate the change.
Thanks for notifying this, your help in the code snippet section is greatly appreciated.

Hope you find out more such bugs
manutd | Junior Poster in Training | Nov 19th, 2006
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void main()Should be int main (void)
~s.o.s~ | Rebellion Revamped | Nov 19th, 2006
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The duplicate code snippet issue has been dealt with.
manutd | Junior Poster in Training | Nov 18th, 2006
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How about you don't double post code snippets?
sneekula | Nearly a Posting Virtuoso | Nov 18th, 2006
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Does not look like C code to me! What does it do here?
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