#include <iostream> 
#include <string> 
#include <fstream> 
#include <vector>
#include <map>
#include "include/libhtml++.h" 
#include "cgi.h" 

#define CGI

using std::vector;
using namespace std;
*
The cgi request function get the query string from the cgi query
*/

bool request()
{
	query_string = string();
	char *request = getenv("REQUEST_METHOD");
	char *env = getenv("QUERY_STRING");
	char *clength = getenv ("CONTENT_LENGTH");

	if( request == 0 ) 
	{ 
		return false;
	}

		else if(request == std::string("GET")) 
		{ 
        		if (env != 0) 
         		{ 
				query_string = env;
				return true;
         		}
		else return false;
		}

		else if(request == std::string("POST"))
		{

	 		if (clength != 0)
			{
	 			getline(cin, query_string);;
				return true;
			}

		else return false;
		}

	else return false;

}

/*
This function formated the cgi input.
*/

void format()
{
	Query query;
	unsigned int len;
	len = query_string.length();

	size_t pos = 0; 
	size_t old_pos = 0; 

	while(query_string.find("+") != string::npos )
		{
			query_string.replace(query_string.find("+") ,1, " ");
		};

	while(len > pos)
		{
     			pos = query_string.find("&", old_pos);

			 	if (pos == string::npos) 
				pos = query_string.length();

			string paar = query_string.substr(old_pos, pos-old_pos);
			size_t eq_pos = paar.find("="); 

			string schluessel = paar.substr(0, eq_pos);

			string wert = paar.substr(eq_pos+1);
 			query.insert(make_pair(schluessel, wert));
			old_pos = pos+1;
       		};
/*
ausgabe funktoniert
*/

map<string,string>::iterator iter;

  for( iter = query.begin(); iter != query.end(); ++iter ) {
    cout << "Key: '" << iter->first << "', Value: " << iter->second << endl; 
	}
/*
ausgabe klappt nicht obwohl key exitiert.
*/

map<string,string>::iterator iter = query.find("test"); t 
  if( iter != query.end() ) {                                           
    cout << "You typed '" << iter->first << "' " << iter->second << " time(s)" << endl;
 }
}

cgi.h

#include <iostream>
#include <map>

using namespace std;

typedef std::map< string, string > Query;
string query_string;

#include <cstdlib>
#include <cstring>

bool request(std::string& dest)
{
	char* request_method = std::getenv("REQUEST_METHOD");
    if (request_method == NULL)
		return false;

	if (std::strcmp(request_method, "GET") == 0)
	{
		char* query = std::getenv("QUERY_STRING")
		if (query == NULL)
			return false;

		dest = query;
	}
	else if (std::strcmp(request_method, "POST") == 0)
	{
		char* content_length = std::getenv("CONTENT_LENGTH");
		if (content_length == NULL)
			return false;

		std::getline(std::cin, dest);
	}
	return true;
}

... usw.

/*
ausgabe funktoniert
*/

map<string,string>::iterator iter;

  for( iter = query.begin(); iter != query.end(); ++iter ) {
    cout << "Key: '" << iter->first << "', Value: " << iter->second << endl; 
	}
/*
ausgabe klappt nicht obwohl key exitiert.
*/

map<string,string>::iterator iter = query.find("test"); t 
  if( iter != query.end() ) {                                           
    cout << "You typed '" << iter->first << "' " << iter->second << " time(s)" << endl;
 }
}

cgi.h

#include <iostream>
#include <map>

using namespace std;

typedef std::map< string, string > Query;
string query_string;

ich hoffe mal, dass das t hinter dem query.find() sowie das grossgeschriebene Query tippfehler sind. - Wie sieht denn der Output aus den diese Zeilen verursachen?

das query_string eine Kopie ist absicht, da der String ja modifiziert wird.