Extend ofToString to convert Windows data types

it doesn't happen often, but often enough that the feature would be nice to have, where I need to convert w_chars, LPTSTR, LPTWSTR etc... the functions are already a part of ofSystemUtils

std::string convertWideToNarrow(const wchar_t *s, char dfault = '?',
const std::locale& loc = std::locale())
{
  std::ostringstream stm;

  while( *s != L'\0' ) {
    stm << std::use_facet< std::ctype<wchar_t> >( loc ).narrow( *s++, dfault );
  }
  return stm.str();
}

std::wstring convertNarrowToWide( const std::string& as ){
    // deal with trivial case of empty string
    if( as.empty() )    return std::wstring();

    // determine required length of new string
    size_t reqLength = ::MultiByteToWideChar( CP_UTF8, 0, as.c_str(), (int)as.length(), 0, 0 );

   // construct new string of required length
   std::wstring ret( reqLength, L'\0' );

   // convert old string to new string
    ::MultiByteToWideChar( CP_UTF8, 0, as.c_str(), (int)as.length(), &ret[0], (int)ret.length() );

    // return new string ( compiler should optimize this away )
    return ret;
}

The problem when you do ofToString(LPTSTR...) is you get the pointer not the string itself e.g.

LPTSTR errorText = 0x0336ffa0 L"The media session cannot pause from a stopped state." wchar_t *

string error = "0336FFA0" std::basic_string<char,std::char_traits,std::allocator >

Review the ofSystemUtils conversion functions and the existing ofToString overloads first, focusing on how Windows types such as wchar_t pointers, LPTSTR, and LPTWSTR are represented. Done means these values produce their string contents rather than pointer addresses, while preserving behavior on other platforms.