devNames.cpp

/*
 * $Header: /Book/devNames.cpp 13    3.06.02 10:44 Oslph312 $
 *
 * Consider including this, or some of it, in Document class? 
 * Would give document-specific printer selection.
 */

#include "precomp.h"
#include "persistence.h"
#include "devNames.h"


DEFINE_PERSISTENT_STRING( "Printer", Driver, "" );
DEFINE_PERSISTENT_STRING( "Printer", Device, "" );
DEFINE_PERSISTENT_STRING( "Printer", Port  , "" );

HGLOBAL getDevNames( LPCTSTR pszPrinter, LPCTSTR pszDriver, LPCTSTR pszPort ) {  
   String strDriver = getDriver();
   String strDevice = getDevice();
   String strPort   = getPort  ();

   if ( 0 != pszPrinter ) {
      strDevice = pszPrinter;
   }
   if ( 0 != pszDriver ) {
      strDriver = pszDriver;
   }
   if ( 0 != pszPort ) {
      strPort = pszPort;
   }

   const int nChars = strDriver.length() + strDevice.length() + strPort.length();
   if ( 0 == nChars ) {
      return 0; // This is OK; will get default initialization.
   }
   const int charsIncludingNulls = nChars + 4;
   const int bytesIncludingNulls = charsIncludingNulls * sizeof( TCHAR );
   HGLOBAL hDevNames = GlobalAlloc( GHND, sizeof DEVNAMES + bytesIncludingNulls );
   DEVNAMES *pDevNames = reinterpret_cast< DEVNAMES * >( GlobalLock( hDevNames ) );
   if ( 0 == pDevNames ) {
      return 0; // This is OK; will get default initialization.
   }

#ifdef trace
   trace( _T( "sizeof( DEVNAMES ) = %d\n" ), sizeof( DEVNAMES ) );
#endif

   LPTSTR stringStart = reinterpret_cast< LPTSTR >( pDevNames ) + sizeof( DEVNAMES ) / sizeof( TCHAR );
   LPTSTR psz = stringStart;
   _tcscpy_s( psz, stringStart + charsIncludingNulls - psz, strDriver.c_str() );
   pDevNames->wDriverOffset = psz - reinterpret_cast< LPTSTR >( pDevNames );
   
   psz += _tcsclen( psz ) + 1;
   _tcscpy_s( psz, stringStart + charsIncludingNulls - psz, strDevice.c_str() );
   pDevNames->wDeviceOffset = psz - reinterpret_cast< LPTSTR >( pDevNames );

   psz += _tcsclen( psz ) + 1;
   _tcscpy_s( psz, stringStart + charsIncludingNulls - psz, strPort.c_str() );
   pDevNames->wOutputOffset = psz - reinterpret_cast< LPTSTR >( pDevNames );

   GlobalUnlock( hDevNames );
   return hDevNames;
}


void setDevNames( HGLOBAL hDevNames ) {

   if ( 0 != hDevNames ) { 
      DEVNAMES *pDevNames = reinterpret_cast< DEVNAMES * >( GlobalLock( hDevNames ) );
      LPCTSTR psz = reinterpret_cast< LPCTSTR >( pDevNames ) + pDevNames->wDriverOffset;
      setDriver( reinterpret_cast< LPCTSTR >( psz ) );
      psz = reinterpret_cast< LPCTSTR >( pDevNames ) + pDevNames->wDeviceOffset;
      setDevice( reinterpret_cast< LPCTSTR >( psz ) );
      psz = reinterpret_cast< LPCTSTR >( pDevNames ) + pDevNames->wOutputOffset;
      setPort( reinterpret_cast< LPCTSTR >( psz ) );
      GlobalUnlock( hDevNames );
   }
}

// end of file