Не хочет записывать данные

//---------------------------------------------------------------------------
#include <fstream>
#include <iostream>
#include <string>
#include <vcl.h>
#include <cmath>
#pragma hdrstop
 
#include "Komonkin1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
ifstream is;
using namespace std;
struct inf{
string i[];
string q[];
};
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender) {
        inf iq[0]={};
      if (OpenDialog1->Execute()){
       ifstream is (OpenDialog1->FileName.c_str(), ifstream::binary);
    // get length of file:  "H:\\copy.txt"
    is.seekg (0, is.end);
    int length = is.tellg();
 
    char * buffer = new char [length];
 
    is.seekg (0, is.beg);
    is.read (buffer,length);
 
    for (int i=0; i <= length; i++) {
        if (i%2==0) {
        iq[0].i=iq[0].i+buffer[i];
        } else {iq[0].q=iq[0].q+buffer[i];};
    };
 
    Edit1->Text=iq[0].i.c_str();
    delete[] buffer;
  }
}
//---------------------------------------------------------------------------