Нужен код функции c_str()

void LoadFromFile(char *s)
{
    ifstream in(s, ios::in | ios::binary );
   if (!in) ShowMessage("Файл не найден, либо не открывается!");
   for (int c = 0; c<size; c++)
        in.read ((char *)&m[c], sizeof m[c]);
   in.close();
   Form1->M1->Lines->Add("Файл " + AnsiString(s) + " загружен успешно!");
}
...
[B]//ПРАВИЛЬНО[/B]
if(OpenDialog1->Execute())
    {
        AnsiString n = OpenDialog1->FileName;
        LoadFromFile(n.c_str());
    }
    FillTable();
[B]//НЕ ПРАВИЛЬНО:[/B]
LoadFromFile((OpenDialog1->FileName).c_str());

void LoadFromFile(TCHAR *s) { /*...*/ }

LoadFromFile(AnsiString(OpenDialog1->FileName).c_str() );

    // C string operator.
    // NOTE: c_str() returns 'char*' by default to be compatible with
    //       AnsiString::c_str(). However, note that it does so by narrowing
    //       the underlying data of the UnicodeString. So, it's dangerous
    //       to use 'char* UnicodeString::c_str()' in cases where the
    //       the owner of the UnicodeString does not expect its underlying
    //       data to change. 
#if !defined(USTRING_CSTR_AS_WCHART)
    // Hack (apparently) for backward compatibility with AnsiString ??
    char*    __fastcall c_str();
#else
    wchar_t* __fastcall c_str() const   { return (Data)? Data: const_cast<wchar_t*>(L"");}
#endif
 
    wchar_t* __fastcall w_str() const   { return (Data)? Data: const_cast<wchar_t*>(L"");}
 
#if defined(UNICODE) || defined(_UNICODE)
    wchar_t* __fastcall t_str() const   { return (Data)? Data: const_cast<wchar_t*>(L"");}
#else
    char*    __fastcall t_str();
#endif

#if defined(_Windows)
    WideChar* __fastcall c_str() const   { return (Data)? Data: const_cast<WideChar*>(L"");}
    WideChar* __fastcall w_str() const   { return (Data)? Data: const_cast<WideChar*>(L"");}
#else    
    WideChar* __fastcall c_str() const   { return (Data)? Data: reinterpret_cast<WideChar*>(const_cast<char16_t*>(u""));}
    WideChar* __fastcall w_str() const   { return (Data)? Data: reinterpret_cast<WideChar*>(const_cast<char16_t*>(u""));}
#endif    
 
    // The previously available 'char* UnicodeString::t_str()' squeezed/corrupted the 
    // underlying word size element into byte size ones.
    // NOTE: As of C++Builder 2011, the logic to convert the underlying data of strings has
    //       been removed and the t_str() method is now flagged as deprecated. Please, 
    //       use UnicodeString::c_str() instead.
    // For more information see:
    //              [url]http://blogs.embarcadero.com/abauer/2010/01/26/38908[/url]
    WideChar* __fastcall t_str _DEPRECATED_ATTRIBUTE0 () const   { return (Data)? Data: const_cast<WideChar*>(_D(""));}
 
    // Read access to raw Data ptr.  Will be NULL for an empty string.
    const void* __fastcall data() const   { return Data; }

typedef std::basic_string<TCHAR> tstring;
typedef std::basic_fstream<TCHAR> tfstream;