Thread: String to Binary Files.

Hey I am having an issue storing string in binary format than reading them back.

here is the code.

Code:

#include <iostream>
#include <conio.h>
#include <vector>
#include <string.h>
#include <map>
#include <fstream>
using namespace std;


typedef map<int,string> ZMAP;
typedef std::pair<int, string> Vp;
ZMAP daMap;
ZMAP Map2;

int main()
{

	cout<<"1(Write) 2(Read): ";
	int c;
	cin>>c;
	if(c == 1)
	{
		fstream ff;
		
		daMap.insert(ZMAP::value_type(0,"bob"));
		daMap.insert(ZMAP::value_type(1,"bob1"));
		daMap.insert(ZMAP::value_type(2,"bob2"));

		ff.open("Test.file", ios::out | ios::binary);

		vector<Vp> v;
		v.reserve(daMap.size());
		v.insert(v.begin(),daMap.begin(),daMap.end());
		vector<Vp>::size_type sz = v.size();
		ff.write(reinterpret_cast<char *>(&sz),sizeof(sz));
		ff.write(reinterpret_cast<char *>(&v[0]),v.size() * sizeof(v[0]));
		ff.close();
	}else{
		fstream fs;
		fs.open("Test.file", ios::in | ios::binary);

		vector<Vp>::size_type szv;
		fs.read(reinterpret_cast<char *>(&szv),sizeof(szv));
		vector<Vp> z(szv);
		fs.read(reinterpret_cast<char *>(&z[0]),z.size() * sizeof z[0]);
		Map2.insert(z.begin(),z.end());
		for(ZMAP::iterator fsz = Map2.begin(); fsz!= Map2.end();++fsz)
		{
			cout<<(*fsz).first<<endl<<(*fsz).second<<endl;
		}
	}
	cout<<"Done"<<endl;
	getch();
}

The Output that i get when reading the data back in is...

Code:

0
e(2
1
  (2
2
  (2
Done

Any advise on how to fix this is greatly appricated.

The goal here is to take the Map data put it into a vector which is written into binary, since this is what was suggested by a few sites.

Thanks again for any advice.