STL map testing ??

[ezuzz]

#include <iostream>
#include <ext/hash_map>
#include <string>
#include <map>
#include <stdio.h>
#include <string.h>

using namespace std;

class subInfo{
    public:
        float Weight;
        subInfo(){}
        subInfo(float _w){
            Weight = _w;
        }
        ~subInfo(){}
        bool operator<(const subInfo & rsh){
            return  Weight < rsh.Weight;
        }
};

typedef map<string , subInfo > _hash;

void DeKey(const char* key,int & t, int & t2){

     memcpy(&t,key,sizeof(int));
     memcpy(&t2,key+sizeof(int),sizeof(int));

}

int main(){


    _hash hs;
    _hash::iterator find;

    int tid=1;

    for(int i=1;i<10;i++){

        char *key = new char[8];
        memset(key,0,8);


        memcpy(key,(char*)&tid,4);
        memcpy(key+sizeof(int),(char*)&i,4);

        cout<<"size:"<<sizeof(key)<<endl;
        cout<<"leng:"<<strlen(key)<<endl;

        find=hs.find(string(key));
        if(find == hs.end()){
            subInfo  sub((float)i);
            hs.insert(make_pair(string(key),sub));
            cout<<"key:["<<key<<"]inserted"<<endl;
        }else {

            int j=0,k=0;
            DeKey(find->first.c_str(),j,k);
            cout<<"key:["<<j<<k<<"] founded"<<endl;
            delete[] key;
        }

    }
    cout<<"----------------------------------------------------"<<endl;
    cout<<"hash size:"<<hs.size()<<endl;
    cout<<"----------------------------------------------------"<<endl;

   return 0;
}

// Q1. only one iterm was inserted. what's wrong??
// Q2. when i finished inserting iterm, release key-memory ?