The Win32 Foundation Classes (WFC) - Version 45

Sam Blackburn

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16 May 2000

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The Win32 Foundation Classes (WFC) are a library of C++ classes that extend Microsoft Foundation Classes (MFC) beyond mere GUI applications, and provide extensive support for system and NT specific applications

wfc.zip
- wfc
  - BACKUP.CMD
  - HTML
    - Document.cmd
    - web
      - CLASSES.HTM
      - Coding.htm
      - gather.cmd
      - HOMEPAGE.HTM
      - pax.HTM
      - Release30.htm
      - Release31.htm
      - Release32.htm
      - Release33.htm
      - release34.htm
      - Release35.htm
      - Release36.htm
      - Release37.htm
      - Release38.htm
      - Release39.htm
      - Release41.htm
      - Release42.htm
      - Release43.htm
      - Release44.htm
      - Samples.htm
      - TechNotes.htm
      - TIMEBEG.HTM
      - TITLE.HTM
      - WFC.HTM
      - WTN001.htm
      - WTN002.htm
      - WTN003.htm
      - WTN004.htm
      - WTN005.htm
      - WTN006.htm
      - WTN007.htm
  - INCLUDE
    - CBase64Coding.hpp
    - CBitArray.hpp
    - CBubble.hpp
    - CConstellation.hpp
    - CCriticalSection.hpp
    - CCrypto.hpp
    - CDataArchive.hpp
    - CDataChunk.hpp
    - CDataFile.hpp
    - CDataLocation.hpp
    - CDataMemory.hpp
    - CDataParser.hpp
    - CDataSocket.hpp
    - CDesktop.hpp
    - CDragQuery.hpp
    - CEventLogRecord.HPP
    - CEVNTLOG.HPP
    - CExtensibleMarkupLanguage.hpp
    - CFile.hpp
    - CFile64.hpp
    - CFileDirectory.hpp
    - CFileTime.hpp
    - CFileTransferProtocol.hpp
    - CGarbageCollector.hpp
    - CJulianDate.hpp
    - CMemoryFile.hpp
    - CMicrosoftTape.hpp
    - CMixer.hpp
    - CNetConn.hpp
    - CNetFile.hpp
    - CNetInfo.hpp
    - CNetMesg.hpp
    - CNetRsrc.hpp
    - CNetSess.hpp
    - CNetShar.hpp
    - CNetUser.hpp
    - CNetWkst.hpp
    - CNetwork.hpp
    - CNetworkScheduleJob.hpp
    - CNMPIPE.HPP
    - CParsePoint.hpp
    - CPasswordChangeFilter.hpp
    - CPhysicalDiskFile.hpp
    - CPing.hpp
    - CQueue.hpp
    - CRandomNumberGenerator.hpp
    - CRandomNumberGenerator2.hpp
    - CRAS.HPP
    - CRASADM.HPP
    - CRASPORT.HPP
    - CReedSolomonErrorCorrectionCode.hpp
    - CREGISTY.HPP
    - CSecureChannel.hpp
    - CServer.hpp
    - CService.hpp
    - CServiceApplication.hpp
    - CSharedMemoryObject.hpp
    - CSMTF.hpp
    - CSquigl.hpp
    - CSuperRandomNumberGenerator.hpp
    - CSvcMgr.hpp
    - CSystemTime.hpp
    - ctape.hpp
    - CTimeEx.hpp
    - CUNC.HPP
    - CURL.HPP
    - CUUCoding.hpp
    - CVolume.hpp
    - CWait.hpp
    - CWeather.hpp
    - CXMLArchive.hpp
    - DCB.HPP
    - DrawGrid.hpp
    - DrawObj.hpp
    - DumyFile.hpp
    - Guards.hpp
    - LSOCKETS.HPP
    - LZFILE.HPP
    - Mfc2Stl.h
    - Modem.hpp
    - mtf.h
    - origianl_CFile.hpp
    - OVRLPD.HPP
    - Pager.hpp
    - PortInformation.hpp
    - RIFF.hpp
    - samtf.h
    - Serial.hpp
    - ServiceConfiguration.hpp
    - SkyWord.hpp
    - SOCKETS.HPP
    - SockFile.hpp
    - SprintSpectrum.hpp
    - stlxml.h
    - Structs.hpp
    - TSOCKETS.HPP
    - WFC.H
    - wfc_coverage.h
    - wfc_crypto.h
    - wfc_linker_setup.h
    - wfc_thread_information_block.h
    - wfc_undocumented.h
    - wfcfloat.h
    - WFCTrace.hpp
    - WindowsSockets.hpp
  - InternalCompilerErrors.txt
  - LIB
    - make.cmd
    - types.xml
    - WFC.dsp
    - WFC.dsw
    - WFC.mak
    - wfcvc42.mak
  - makewebsite.cmd
  - old_paxit.cmd
  - PAXIT.CMD
  - Renames.txt
  - SRC
    - ATCP.cpp
    - CBase64Coding.cpp
    - CBitArray.cpp
    - CBubble.cpp
    - CConstellation.cpp
    - CCriticalSection.cpp
    - CCriticalSectionGuard.cpp
    - CCryptographicAlgorithm.cpp
    - CCryptographicHash.cpp
    - CCryptographicKey.cpp
    - CCryptographicProvider.cpp
    - CCryptography.cpp
    - CDataArchive.cpp
    - CDataChunk.cpp
    - CDataFile.cpp
    - CDataMemory.cpp
    - CDataParser.cpp
    - CDataSocket.cpp
    - CDesktop.cpp
    - CDragQuery.cpp
    - CEventLogRecord.CPP
    - CEVNTLOG.CPP
    - CExtensibleMarkupLanguageAttribute.cpp
    - CExtensibleMarkupLanguageDocument.cpp
    - CExtensibleMarkupLanguageElement.cpp
    - CExtensibleMarkupLanguageEntities.cpp
    - CFile.cpp
    - CFile64.cpp
    - CFileDirectory.cpp
    - CFileTime.cpp
    - CFileTransferProtocol.cpp
    - CGarbageCollector.cpp
    - CJulianDate.cpp
    - CMemoryFile.cpp
    - CMicrosoftTape.cpp
    - CMixer.cpp
    - CMixerCapabilities.cpp
    - CMixerControl.cpp
    - CMixerControlDetails.cpp
    - CMixerControlDetailsData.cpp
    - CMixerControlInstance.cpp
    - CMixerDestination.cpp
    - CMixerLine.cpp
    - CMixerSource.cpp
    - CMixerSourceSelector.cpp
    - CMixerSpeakers.cpp
    - CMixerSwitchControl.cpp
    - CMixerVolumeControl.cpp
    - CMixerWaveIn.cpp
    - CNetConn.cpp
    - CNetFile.cpp
    - CNetInfo.cpp
    - CNetMesg.cpp
    - CNetRsrc.cpp
    - CNetScheduleJob.cpp
    - CNetSess.cpp
    - CNetShar.cpp
    - CNetWkst.cpp
    - CNetwork.cpp
    - CNetworkConnectionInformation.cpp
    - CNetworkFileInformation.cpp
    - CNetworkResourceInformation.cpp
    - CNetworkSessionInformation.cpp
    - CNetworkUser.cpp
    - CNetworkUserInformation.cpp
    - CParsePoint.cpp
    - CPasswordChangeFilter.cpp
    - CPhysicalDiskFile.cpp
    - CPing.cpp
    - CPingRes.cpp
    - CQueue.cpp
    - CRandomNumberGenerator.cpp
    - CRandomNumberGenerator2.cpp
    - CRAS.CPP
    - CRASADM.CPP
    - CReedSolomonErrorCorrectionCode.cpp
    - CRIFFChunk.cpp
    - CSecureChannel.cpp
    - CServer.cpp
    - CService.cpp
    - CServiceApplication.cpp
    - CSharedMemoryObject.cpp
    - CSMTF.cpp
    - CSquigl.cpp
    - CSuperRandomNumberGenerator.cpp
    - CSvcMgr.cpp
    - CSystemTime.cpp
    - CTape.cpp
    - CTapeGetMediaParameters.cpp
    - CTimeEx.cpp
    - CUNC.CPP
    - CURL.CPP
    - CUUCoding.cpp
    - CVolume.cpp
    - CWait.cpp
    - CWeather.cpp
    - CXMLArchive.cpp
    - DCB.CPP
    - doc.cmd
    - DrawGrid.cpp
    - DrawObj.cpp
    - DumyFile.cpp
    - IPCP.cpp
    - IPXCP.cpp
    - LMErr.cpp
    - LSOCKETS.CPP
    - LZFile.cpp
    - Modem.CPP
    - NAMDPIPE.CPP
    - NBFCP.cpp
    - original_CFile.cpp
    - OVRLPD.CPP
    - Pager.cpp
    - PortInformation.CPP
    - RASCP.CPP
    - RASNBPCP.CPP
    - RASPORT.CPP
    - RASPPPCR.cpp
    - RASPSTAT.CPP
    - REGISTRY.CPP
    - RemoteAccessServicePort.CPP
    - RemoteAccessServiceUser.cpp
    - Serial.CPP
    - ServiceConfiguration.cpp
    - SkyWord.cpp
    - SOCKETS.CPP
    - SockFile.cpp
    - SprintSpectrum.cpp
    - STL_CByteArray.cpp
    - STL_CDWordArray.cpp
    - STL_CPtrArray.cpp
    - STL_CString.cpp
    - STL_CStringArray.cpp
    - STL_CUIntArray.cpp
    - STL_CWordArray.cpp
    - Structs.cpp
    - TALKSOCK.CPP
    - U2A_A2U.cpp
    - wfc_am_i_administrator.cpp
    - wfc_append_string_to_CByteArray.cpp
    - wfc_append_text_to_edit_control.cpp
    - wfc_close_handle.cpp
    - wfc_convert_double_null_terminated_string.cpp
    - wfc_convert_double_null_terminated_UNICODE_string.cpp
    - wfc_convert_lpwstr_to_cstring.cpp
    - wfc_create_hard_link.cpp
    - wfc_delete_oldest_file.cpp
    - wfc_enable_all_privileges.cpp
    - wfc_enable_privilege.cpp
    - wfc_get_day_of_week.cpp
    - wfc_get_directory_usage_percentage.cpp
    - wfc_get_error_string.cpp
    - wfc_get_executable_directory.cpp
    - wfc_get_filename_from_handle.cpp
    - wfc_get_list_of_programs_that_run_when_a_user_logs_on.cpp
    - wfc_get_operating_system_version_string.cpp
    - wfc_get_web_page.cpp
    - wfc_move_file_at_reboot.cpp
    - wfc_parse_iso_8601_string.cpp
    - wfc_set_thread_name.cpp
    - wfc_start_screen_saver.cpp
    - wfc_undocumented_get_system_process_list.cpp
    - wfc_UNICODE_floating_point_routines.cpp
    - WfcTrace.cpp
    - xml_character_test_routines.cpp
  - WFC World.txt
  - wfcfaq.htm
sample.zip
- sample
  - Sample
    - ADO2XML
      - ADO2XML.dsp
      - ADO2XML.dsw
      - ado2xml.h
      - ado2xml.xml
      - CDatabaseParameters.cpp
      - CDatabaseParameters.hpp
      - convert_DataTypeEnum_to_string.cpp
      - convert_desired_tables.cpp
      - convert_table.cpp
      - get_blob.cpp
      - get_table_names.cpp
      - main.cpp
      - normalize_string.cpp
      - open_connection_to_database.cpp
      - output_field.cpp
      - output_schema.cpp
      - output_types.cpp
      - print_COM_error.cpp
      - print_provider_error.cpp
      - replace.cpp
    - ChangeServiceConfiguration
      - ChangeServiceConfiguration.cpp
      - ChangeServiceConfiguration.dsp
      - ChangeServiceConfiguration.dsw
      - ChangeServiceConfiguration.mak
    - ClockSync
      - ClockSync.cpp
      - ClockSync.dsp
      - ClockSync.dsw
      - ClockSync.mak
    - Counter
      - Counter.cpp
      - counter.h
      - counter.mak
      - CPCD.cpp
      - CPCD.hpp
      - CPerfDef.cpp
      - CPerfDef.hpp
      - CPerformanceCounterData.hpp
      - CPerformanceCounterDefinition.cpp
      - CPerformanceCounterDefinition.hpp
      - CPerformanceData.cpp
      - CPerformanceData.hpp
      - CPerformanceInstance.cpp
      - CPerformanceInstance.hpp
      - CPerformanceObject.cpp
      - CPerformanceObject.hpp
      - test.cpp
    - Crypto
      - Crypto.cpp
      - Crypto.dsp
      - Crypto.dsw
      - Crypto.mak
    - CScript
      - CScript.dsp
      - CScript.dsw
      - main.cpp
    - Data
      - CSimpleClass.hpp
      - Receiver
        
        Receiver.cpp
        
        Receiver.dsp
        
        Receiver.dsw
      - Sender
        
        Sender.cpp
        
        Sender.dsp
        
        Sender.dsw
    - DeMangle
      - DeMangle.dsp
      - DeMangle.dsw
      - main.cpp
    - DriverMover
      - DriverMover.cpp
      - DriverMover.dsp
      - DriverMover.dsw
      - DriverMover.h
      - DriverMover.rc
      - DriverMoverDialog.cpp
      - DriverMoverDialog.h
      - ReadMe.txt
      - res
        
        DriverMover.ico
        
        DriverMover.rc2
      - resource.h
      - StdAfx.cpp
      - StdAfx.h
    - dump_ntfs_streams.cpp
    - DumpEventLog
      - DumpEventLog.cpp
      - DumpEventLog.mak
    - EnableRASLogging
      - EnableRASLogging.cpp
      - EnableRASLogging.mak
    - EventPager
      - EventPager.cpp
      - EventPager.dsp
      - EventPager.dsw
      - EventPager.mak
      - MAKEMC.CMD
      - messages.h
      - messages.mc
      - messages.rc
    - GetWebPage
      - CNNWeather.cpp
      - CStockQuote.hpp
      - GetStockQuote.cpp
      - GetWebPage.cpp
      - GetWebPage.dsp
      - GetWebPage.dsw
      - GetWebPage.mak
      - wc.html
      - WeatherChannelWeather.cpp
    - HTML
      - html.cpp
      - html.dsp
      - html.dsw
      - html.mak
    - KillDoc
      - KillDoc.dsp
      - KillDoc.dsw
      - main.cpp
    - LastEvent
      - LastEvent.cpp
      - LastEvent.dsp
      - LastEvent.dsw
      - LastEvent.mak
    - Listen
      - Listen.cpp
      - Listen.dsp
      - Listen.dsw
      - Listen.mak
      - sl.cpp
    - ListProcesses
      - list_processes.cpp
      - ListProcesses.dsp
      - ListProcesses.dsw
      - ListProcesses.h
      - main.cpp
      - print_process_list.cpp
    - MAKEMC.CMD
    - Map2Def
      - Map2Def.cpp
      - Map2Def.dsp
      - Map2Def.dsw
      - Map2Def.mak
    - Microphone
      - main.cpp
      - Microphone.dsp
      - Microphone.dsw
    - MIME2HTML
      - Debug
        
        mime.html
      - dump_mime_mappings.cpp
      - dump_mime_type.cpp
      - get_command_line.cpp
      - main.cpp
      - MIME2HTML.dsp
      - MIME2HTML.dsw
      - MIME2HTML.h
      - normalize_string.cpp
      - replace.cpp
    - PasswordFilter
      - DLL
        
        InitializeChangeNotify.cpp
        
        PasswordChangeNotify.cpp
        
        PasswordDLL.cpp
        
        PasswordDLL.dsp
        
        PasswordDLL.dsw
        
        PasswordDLL.h
      - PasswordFilter.cpp
      - PasswordFilter.dsp
      - PasswordFilter.dsw
    - Ping
      - Ping.cpp
      - Ping.dsp
      - Ping.dsw
      - Ping.mak
    - Pinger
      - MAKEMC.CMD
      - messages.h
      - MESSAGES.MC
      - messages.rc
      - Pinger.cpp
      - Pinger.dsp
      - Pinger.dsw
      - Pinger.mak
      - PINGER.RC
      - Pinger.ver
      - resource.h
    - RasAdmin
      - RasAdmin.cpp
      - RasAdmin.dsp
      - RasAdmin.dsw
      - RasAdmin.mak
    - Serial
      - Serial.cpp
      - Serial.dsp
      - Serial.dsw
      - Serial.h
      - Serial.mak
    - SerialTest
      - Normal
        
        Receiver
        
        compute_checksum.cpp
        
        main.cpp
        
        Receiver.dsp
        
        Receiver.dsw
        
        receiver.h
        
        Sender
        
        main.cpp
        
        prepare_buffer.cpp
        
        Sender.dsp
        
        Sender.dsw
        
        sender.h
    - Service
      - Service.cpp
      - Service.dsp
      - Service.dsw
      - Service.mak
    - SkyPage
      - SKYPAGE.CPP
      - SkyPage.dsp
      - SkyPage.dsw
      - SkyPage.mak
    - SprintSpectrum
      - SprintSpectrum.cpp
      - SprintSpectrum.dsp
      - SprintSpectrum.dsw
      - SprintSpectrum.mak
    - Squiggle
      - Squiggle.cpp
      - Squiggle.mak
    - TortureXML
      - create_huge_character_reference.cpp
      - create_huge_element.cpp
      - create_huge_element_and_attribute.cpp
      - create_huge_element_name.cpp
      - create_huge_encoding.cpp
      - create_huge_version.cpp
      - main.cpp
      - TortureXML.dsp
      - TortureXML.dsw
      - TortureXML.h
    - USNOTime
      - main.cpp
      - USNOTime.dsp
      - USNOTime.dsw
    - WatchDog
      - MAKEMC.CMD
      - messages.h
      - messages.mc
      - messages.rc
      - WatchDog.cpp
      - WatchDog.dsp
      - WatchDog.dsw
      - WatchDog.mak
      - WatchDog.rc
      - WatchDog.ver
    - Wfc2Html
      - CCPPToHTMLTranslator.cpp
      - CCPPToHTMLTranslator.hpp
      - load_translator.cpp
      - main.cpp
      - translate_file.cpp
      - Wfc2Html.dsp
      - Wfc2Html.dsw
      - wfc2html.h
    - WinPage
      - res
        
        WinPage.ico
        
        WinPage.rc2
      - resource.h
      - WinPage.cpp
      - WinPage.dsp
      - WinPage.dsw
      - WinPage.h
      - WinPage.mak
      - WinPage.rc
      - WinPageDlg.cpp
      - WinPageDlg.h
    - XML
      - Debug
        
        test2.xml
      - dump_element.cpp
      - dump_tags.cpp
      - get_bytes.cpp
      - main.cpp
      - my_xml.h
      - parse_document.cpp
      - poem.xml
      - test.xml
      - TestSuite.xml
      - XML.DSP
      - XML.dsw
    - XMLCheck
      - check_xml_file.cpp
      - Debug
        
        check.txt
        
        test.xml
        
        TestSuite.xml
        
        TestSuite2.xml
        
        txtfirst.xml
        
        txtlast.xml
      - main.cpp
      - XML
        
        a2.xml
      - XMLCheck.dsp
      - XMLCheck.dsw
      - XMLCheck.h
      - XMLCheck.mak
    - XMLExplorer
      - CMainFrame.cpp
      - CMainFrame.h
      - CXMLExplorerDocument.cpp
      - CXMLExplorerDocument.h
      - CXMLExplorerView.cpp
      - CXMLExplorerView.h
      - MyListView.cpp
      - MyListView.h
      - MyTreeView.cpp
      - MyTreeView.h
      - ReadMe.txt
      - res
        
        bitmap1.bmp
        
        CXMLExplorerDocument.ico
        
        Toolbar.bmp
        
        XMLExplorer.ico
        
        XMLExplorer.rc2
      - resource.h
      - StdAfx.cpp
      - StdAfx.h
      - test.xml
      - XMLExplorer.cpp
      - XMLExplorer.dsp
      - XMLExplorer.dsw
      - XMLExplorer.h
      - XMLExplorer.rc
    - XMLUser
      - add_current_time.cpp
      - add_level.cpp
      - add_machine_name.cpp
      - add_to_xml.cpp
      - enumerate_users.cpp
      - main.cpp
      - parse_document.cpp
      - save_document.cpp
      - users.xml
      - XMLUser.dsp
      - XMLUser.dsw
      - XMLUser.h
  - TEST
    - CQueue_stress_test.cpp
    - dumpexports.cpp
    - Grid
      - Grid.cpp
      - Grid.mak
    - MESSAGES.MC
    - Output.txt
    - Pipe
      - pipe.CPP
      - Pipe.h
      - Pipe.mak
      - Server.CPP
    - REPERR.CPP
    - TCLZFile.CPP
    - TCNet.CPP
    - TCNetCon.CPP
    - TCNetFil.CPP
    - TCNetshs.CPP
    - TCNetUSR.CPP
    - TCNSrc.cpp
    - TCRAS.CPP
    - TCRASPORT.CPP
    - TCREG.CPP
    - TCSess.CPP
    - TCSrvr.CPP
    - TCSvcMgr.CPP
    - TCTape.cpp
    - TEST.CPP
    - TEST.dsp
    - TEST.dsw
    - TEST.H
    - TEST.MAK
    - test_CBase64Coding.cpp
    - test_CBitArray.cpp
    - test_CByteArray.cpp
    - test_CDataParser.cpp
    - test_CDWordArray.cpp
    - test_CFileTransferProtocol.cpp
    - test_CJulianDate.cpp
    - test_CNetwork.CPP
    - test_CPtrArray.cpp
    - test_CQueue.cpp
    - test_CRandomNumberGenerator.cpp
    - test_CReedSolomonErrorCorrectionCode.cpp
    - test_CSerialFile.cpp
    - test_CString.cpp
    - test_CSystemTime.cpp
    - test_CUIntArray.cpp
    - test_CUUCoding.cpp
    - test_CWordArray.cpp
    - test_CXMLDocument.cpp
    - test_XML.cpp
    - TEVNTLOG.CPP
    - TURL.CPP
    - XMLConformanceTest
      - main.cpp
      - XMLConformanceTest.dsp
      - XMLConformanceTest.dsw
      - XMLConformanceTest.h
html.zip
- HTML
  - html.cpp
  - html.dsp
  - html.dsw
  - html.mak

#include <wfc.h>
#pragma hdrstop

/*
** Author: Samuel R. Blackburn
** Internet: wfc@pobox.com
**
** You can use it any way you like as long as you don't try to sell it.
**
** Any attempt to sell WFC in source code form must have the permission
** of the original author. You can produce commercial executables with
** WFC but you can't sell WFC.
**
** Copyright, 2000, Samuel R. Blackburn
**
** $Workfile: CGarbageCollector.cpp $
** $Revision: 16 $
** $Modtime: 1/17/00 9:05a $
** $Reuse Tracing Code: 1 $
*/

#if defined( _DEBUG ) && ! defined( WFC_STL )
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#define new DEBUG_NEW
#endif // _DEBUG

CGarbageCollector::CGarbageCollector()
{
   WFCLTRACEINIT( TEXT( "CGarbageCollector::CGarbageCollector()" ) );

   m_ReferenceCount = 0;
   m_SelfDestruct   = FALSE;
}

CGarbageCollector::~CGarbageCollector()
{
   WFCLTRACEINIT( TEXT( "CGarbageCollector::~CGarbageCollector()" ) );

   m_ReferenceCount = 0;
   m_SelfDestruct   = FALSE;
}

void CGarbageCollector::AddReference( void )
{
   WFCLTRACEINIT( TEXT( "CGarbageCollector::AddReference()" ) );

   ::InterlockedIncrement( (long *) &m_ReferenceCount );

   WFCTRACEVAL( TEXT( "Reference count is now " ), m_ReferenceCount );
}

#if defined( _DEBUG ) && ! defined( WFC_NO_DUMPING )

void CGarbageCollector::Dump( CDumpContext& dump_context ) const
{
   dump_context << TEXT( "a CGarbageCollector at " ) << (VOID *) this    << TEXT( "\n{\n" );
   dump_context << TEXT( "   m_ReferenceCount is " ) << m_ReferenceCount << TEXT( "\n" );
   dump_context << TEXT( "   m_SelfDestruct is   " );

   if ( m_SelfDestruct == FALSE )
   {
      dump_context << TEXT( "False\n" );
   }
   else
   {
      dump_context << TEXT( "True\n" );
   }

   dump_context << TEXT( "}\n" );
}

#endif // _DEBUG

long CGarbageCollector::GetReferenceCount( void ) const
{
   return( m_ReferenceCount );
}

BOOL CGarbageCollector::GetSelfDestruct( void ) const
{
   return( m_SelfDestruct );
}

void CGarbageCollector::Release( BOOL * object_was_deleted )
{
   WFCLTRACEINIT( TEXT( "CGarbageCollector::Release()" ) );

   if ( m_ReferenceCount <= 0 )
   {
      WFCTRACE( TEXT( "Reference count is already zero!" ) );
      ASSERT( FALSE );
   }

   try
   {
      if ( ::InterlockedDecrement( (long *) &m_ReferenceCount ) == 0 )
      {
         if ( m_SelfDestruct != FALSE )
         {
            if ( object_was_deleted != NULL )
            {
               *object_was_deleted = TRUE;
            }

            delete this;
         }
         else
         {
            if ( object_was_deleted != NULL )
            {
               *object_was_deleted = FALSE;
            }
         }
      }
      else
      {
         if ( object_was_deleted != NULL )
         {
            *object_was_deleted = FALSE;
         }
      }
   }
   catch( ... )
   {
      // Do Nothing
   }
}

void CGarbageCollector::SetSelfDestruct( BOOL self_destruct )
{
   WFCLTRACEINIT( TEXT( "CGarbageCollector::SetSelfDestruct()" ) );

   if ( self_destruct != FALSE )
   {
      m_SelfDestruct = TRUE;
   }
   else
   {
      m_SelfDestruct = FALSE;
   }
}

// End of source

#if 0
<HTML>

<HEAD>
<TITLE>WFC - CGarbageCollector</TITLE>
<META name="keywords" content="WFC, MFC extension library, freeware class library, Win32, source code">
<META name="description" content="The C++ class that makes it easy to implement copy-on-write (reference counted) objects.">
</HEAD>

<BODY>

<H1>CGarbageCollector</H1>
$Revision: 16 $<HR>

<H2>Description</H2>
This class implements a simple garbage collector. You inherit from
<B>CGarbageCollector</B> and your class will self destruct when the
reference count reaches zero. <B>CGarbageCollector</B> should only
be set to self destruct when it has been created via <CODE>new</CODE>.

<H2>Methods</H2>

<DL COMPACT>

<DT><PRE>void <B>AddReference</B>( void )</PRE><DD>
This increments the reference count and prevents the
object from being deleted.

<DT><PRE>void <B>Dump</B>( CDumpContext&amp; dump_context ) const</PRE><DD>
Present only in debug builds. Dumps interesting information about
<B>CGarbageCollector</B> to the <CODE>dump_context</CODE> provided.

<DT><PRE>BOOL <B>GetSelfDestruct</B>( void ) const</PRE><DD>
Returns whether this object will self destruct when the
reference count reaches zero.

<DT><PRE>long <B>GetReferenceCount</B>( void ) const</PRE><DD>
Returns the reference count.

<DT><PRE>void <B>Release</B>( BOOL * deleted = NULL )</PRE><DD>
Decrements the reference count and checks to see if it is zero.
If the reference count is zero, the object will self destruct
(i.e. call <CODE>delete this</CODE>). If <CODE>deleted</CODE> is
not NULL, it will be filled with TRUE if the object was deleted
or FALSE if there are still references to it somewhere.

<DT><PRE>void <B>SetSelfDestruct</B>( BOOL self_destruct = TRUE )</PRE><DD>
This should be called after <B>CGarbageCollector</B> has been
created via <CODE>new</CODE>.

</DL>

<H2>Example</H2><PRE><CODE>#include &lt;wfc.h&gt;
#pragma hdrstop

class CThreadData : public <B>CGarbageCollector</B>
{
   protected:

      DWORD m_Data;

   public:

      void SetData( DWORD data ) { m_Data = data; };
      DWORD GetData( void ) const { return( m_Data ); };
};

void worker_thread( void * parameter )
{
   <A HREF="WfcTrace.htm">WFCTRACEINIT</A>( TEXT( &quot;worker_thread()&quot; ) );

   CThreadData * thread_data = (CThreadData *) parameter;

   // Make sure the thread data is around until we call Release
   thread_data-&gt;AddReference();

   // Go do something that takes a really long time

   Sleep( 10000 );

   thread_data-&gt;Release();
}

void start_thread( void )
{
   <A HREF="WfcTrace.htm">WFCTRACEINIT</A>( TEXT( &quot;start_thread()&quot; ) );

   CThreadData * data_p = NULL;
   
   try
   {
      data_p = new CThreadData;
   }
   catch( ... )
   {
      return;
   }

   data_p-&gt;AddReference();
   data_p-&gt;SetSelfDestruct( TRUE );

   _beginthread( worker_thread, 0, data_p );

   Sleep( 0 );

   data_p-&gt;Release();
}</CODE></PRE>

<HR><I>Copyright, 2000, <A HREF="mailto:wfc@pobox.com">Samuel R. Blackburn</A></I><BR>
$Workfile: CGarbageCollector.cpp $<BR>
$Modtime: 1/17/00 9:05a $
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Written By

Sam Blackburn

United States

I'm just a simple little NT programmer. Most of the work I do is remote controlling equipment in real time. I started out using Windows 3.0. Then came 3.1 and then NT. I started using NT but unfortunately, Microsoft didn't. I started using MFC but unfortunately, Microsoft didn't (and still doesn't) put any real support for NT into MFC so I wrote a bunch of C++ classes to make my life easier. Like all class libraries, mine grew. Now I'm giving it away, I call it Win32 Foundation Classes.

Check out Sam's homepage at www.SamBlackburn.com/wfc/.

The Win32 Foundation Classes (WFC) - Version 45

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