mb_set_userdata

status_t mb_set_userdata( mb_interpreter_t* s, void* userdata )

The interpreter structure has a void* user value reserved to be used by the user for any purpose.  This can be a pointer to a data structure on any other value that the user assigns to it.  To retrieve this, use mb_get_userdata.  This is normally used to exchange data such as pointer to classes etc. between the calling code and callbacks such as error and I/O handlers.

Example

/////////////////////////////////////////////////////////////////////////////

// Simple PRINT handler that uses AfxMessageBox to output the supplied strings

//

int CMyBASIC2View::_printstring( mb_interpreter_t* s, const char* pStr, ... )

  {

  char  pBuffer[2048];

  va_list params;

  va_start( params, pStr );

  sprintf( pBuffer, pStr, va_arg( params, void* ) );

  va_end( params );

  CMyBASIC2View* pCurrentView = (CMyBASIC2View*)mb_get_userdata( s );

  if ( pCurrentView && ( pCurrentView->GetDocument()->GetRunMode() == eWindowsApp ) )

     {

     AfxMessageBox( pBuffer );

     }

  endif

  return strlen( pStr );

  }

endfunc

/////////////////////////////////////////////////////////////////////////////

// Constructor

//

CMyBASIC2View::CMyBASIC2View()

  {

  m_bas = NULL;

  // Init My Basic Interpreter

  mb_init();

  mb_open( &m_bas );

  // Setup callback handlers

  mb_set_error_handler( m_bas, CMyBASIC2View::_on_error );

  mb_set_inputer_ex( m_bas, CMyBASIC2View::_getstring );

  mb_set_printer_ex( m_bas, CMyBASIC2View::_printstring );

  mb_set_check_keyboard_handler_ex( m_bas, CMyBASIC2View::_check_keyboard );

  // Set userdata to point to this class

  mb_set_userdata( m_bas, this );

  }

endfunc