Edit1->Text

//---------------------------------------------------------------------------
 
#include <vcl.h>
#include <fstream.h>
#pragma hdrstop
 
#include "Form.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma link "CSPIN"
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::Button1Click(TObject *Sender)
{
 if(OpenDialog1->Execute())
  {
   Edit1->Text=OpenDialog1->FileName;
  }
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::Button2Click(TObject *Sender)
{
  int filesize(CSpinEdit1->Value);
 
 ofstream outfile(Edit1->Text,ios::app); //ошибка
 
 for(int i = 0; i < filesize* 1048576; i++)
 {
     outfile << sizeof(filesize);
 }
        
}
//---------------------------------------------------------------------------

ofstream outfile(Edit1->Text.c_str(),ios::app);