c++ - vector in function - how to do return

I've got a function that should read from file line by line, the reading stops when a line does not begin with '>' or ' '. It should store the lines in vector and return it.
This is code:

    #include 

    #include 
    #include 
    #include 
    #include 
    #include 

    using namespace std;

    string getseq(char * db_file) // gets sequences from file
            {

                string seqdb;
                vector seqs;
                ifstream ifs(db_file);
                string line;

                //vector seqs[size/3];

                while(ifs.good())
                {
                    getline(ifs, seqdb);

                    if (seqdb[0] != '>' & seqdb[0]!=' ')
                    {
                        seqs.push_back(seqdb);
                    }
                }

            ifs.close();
            //return seqs;

            //return seqs;

            }

    int main(int argc, char * argv[1])
    {
        cout << "Sequences: \n" << getseq(argv[1]) << endl;
        return 0;
    }

Compiler (g++) returns:

    fasta_parser.cpp: In function ‘std::string getseq(char*)’:
    fasta_parser.cpp:32: error: conversion from ‘std::vector, std::allocator >, std::allocator, std::allocator > > >’ to non-scalar type ‘std::string’ requested`

Anyone has any idea?

Edit:
As Skurmendel ask, I am adding whole code because of memory security violation after

executing compiled code:

#include 
#include 
#include 
#include 
#include 
#include 

using namespace std;


vector getseq(char * db_file) // pobiera sekwencje z pliku
        {
            string seqdb;
            vector seqs;
            ifstream ifs(db_file);
            string line;

            //vector seqs[size/3];


            while(ifs.good())
            {
                getline(ifs, seqdb);
                if (seqdb[0] != '>' & seqdb[0]!=' ')
                {
                    seqs.push_back(seqdb);
                }
            }

        ifs.close();

        return seqs;
        }

int main(int argc, char * argv[1])
{
    vector seqs;   // Holds our strings.
    getseq(argv[1]); // We don't return anything.

    // This is just a matter of taste, we create an alias for the vector iterator type.
    typedef vector::iterator string_iter;


    // Print prelude.
    cout << "Sekwencje: \n";

    // Loop till we hit the end of the vector.
    for (string_iter i = seqs.begin(); i != seqs.end(); i++)
    {
        cout << *i << " "; // Do processing, add endlines, commas here etc.
    }


    cout << endl;
}

Answer

If I understood you, your getseq() should return a vector of strings. Therefore you should change

string getseq(char * db_file)

to

vector getseq(char * db_file)

And if you want to print it on main() you should do it in a loop.

int main() {
     vector str_vec = getseq(argv[1]);
     for(vector::iterator it = str_vec.begin(); it != str_vec.end(); it++) {
         cout << *it << endl;

     }
}