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VC++ 监视文件（夹）

news 来源：原创 2024/5/17 19:06:39

　　参考：http://www.cnblogs.com/fangkm/archive/2009/03/31/1426526.html

　　WinFileSystemMonitor.h

    C++ Code 
  

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#pragma once

// 文件目录改变的类型
enum tagACTION
{
    Added     = 1 ,            //添加了文件/目录
    Removed   = 2 ,            //删除了文件/目录
    Modified  = 3 ,            //更改了文件/目录
    Renamed   = 4              //重命名了文件/目录
};

//定义文件/目录改变后的回调函数指针
typedef    void (*lpFunDealFile)(tagACTION action, LPCTSTR lpszFileSrc, LPCTSTR lpszFileDst);

class CWinFileSystemMonitor
{

public :
    CWinFileSystemMonitor();
    ~CWinFileSystemMonitor();

     /*
    * 设置回调函数
    */
     void SetDealFilePtr( lpFunDealFile pFunDeal );

     /*
    * 开启监视
    */
    BOOL StartMonitor( LPCTSTR lpszDir );

     /*
    * 停止监视
    */
     void EndMonitor();

     /*
    * 正在监视？
    */
    BOOL IsMoniting();

     /*
    * 回调函数
    */
     static void ActionProcess(tagACTION action, LPCTSTR lpszFileSrc, LPCTSTR lpszFileDst);

private :
     //监视文件/目录句柄
    HANDLE  m_hDir;

     //继续监视
     volatile BOOL m_bContinue;

     //监视线程句柄
    HANDLE  m_hThread;

     //回调指针
    lpFunDealFile m_pFunDeal;

     //监视线程处理函数
     static DWORD WINAPI MonitorProc( LPVOID lParam );

};

　　WinFileSystemMonitor.cpp

    C++ Code 
  

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#include "WinFileSystemMonitor.h"

CWinFileSystemMonitor::CWinFileSystemMonitor( void )
{
    m_hDir       =   NULL ;
    m_bContinue  =  FALSE;
    m_hThread    =   NULL ;
}

CWinFileSystemMonitor::~CWinFileSystemMonitor( void )
{
}

void CWinFileSystemMonitor::SetDealFilePtr(lpFunDealFile pFunDeal)
{
    ASSERT( pFunDeal != NULL );
    m_pFunDeal = pFunDeal;
}

BOOL CWinFileSystemMonitor::StartMonitor( LPCTSTR lpszDir )
{
    ASSERT( m_hThread == NULL );

    HANDLE hDir = ::CreateFile(lpszDir,
                               GENERIC_READ | FILE_LIST_DIRECTORY,
                               FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
                                NULL ,
                               OPEN_EXISTING,
                               FILE_FLAG_BACKUP_SEMANTICS,
                                NULL );
     if (INVALID_HANDLE_VALUE == hDir)
    {
         return FALSE;
    }

    m_hDir = hDir;
    m_bContinue = TRUE;
    m_hThread = ::CreateThread( NULL , 0 , MonitorProc, this , 0 , NULL );
     if ( NULL != m_hThread)
    {
        SetDealFilePtr(ActionProcess);
    }
     return ( NULL == m_hThread ) ? FALSE : TRUE;
}

void CWinFileSystemMonitor::EndMonitor()
{
    ASSERT( m_hThread != NULL );
    m_bContinue = FALSE;
    DWORD dwRet = ::WaitForSingleObject(m_hThread, 1000 );
     if (WAIT_TIMEOUT == dwRet)
    {
        ASSERT( m_hThread != NULL );
        ::TerminateThread(m_hThread, - 1 );
    }

    ::CloseHandle(m_hDir);
    m_hDir = NULL ;
    m_hThread = NULL ;

}

BOOL CWinFileSystemMonitor::IsMoniting()
{
     return m_bContinue;
}

DWORD WINAPI CWinFileSystemMonitor::MonitorProc( LPVOID lParam )
{
    CWinFileSystemMonitor *pThis = (CWinFileSystemMonitor *)lParam;
    ASSERT( pThis != NULL );

     char szBuf[ 2 * ( sizeof ( FILE_NOTIFY_INFORMATION ) + MAX_PATH ) ] = { 0 };
    FILE_NOTIFY_INFORMATION *pNotify = (FILE_NOTIFY_INFORMATION *)szBuf;
    DWORD dwBytesReturned = 0 ;

     while ( pThis->m_bContinue )
    {
         if ( !::ReadDirectoryChangesW(pThis->m_hDir,
                                     pNotify,
                                      sizeof (szBuf),
                                     TRUE,
                                     FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME |
                                     FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SIZE |
                                     FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_LAST_ACCESS |
                                     FILE_NOTIFY_CHANGE_CREATION | FILE_NOTIFY_CHANGE_SECURITY,
                                     &dwBytesReturned,
                                      NULL ,
                                      NULL ) )
        {
             break ;
        }
         else
        {
            WCHAR *pszFileDst = NULL ;
            WCHAR *pszFileSrc = pNotify->FileName;
            pszFileSrc[pNotify->FileNameLength / 2 ] = L '\0' ;

             if ( 0 != pNotify->NextEntryOffset)
            {
                PFILE_NOTIFY_INFORMATION pNext = (PFILE_NOTIFY_INFORMATION)(( char *)pNotify + pNotify->NextEntryOffset);
                pszFileDst = pNext->FileName;
                pszFileDst[pNext->FileNameLength / 2 ] = L '\0' ;
            }
             if ( NULL != pThis->m_pFunDeal)
            {
                pThis->m_pFunDeal((tagACTION)pNotify->Action, CW2T(pszFileSrc), CW2T(pszFileDst));
            }
        }
    }

     return 0 ;
}

void CWinFileSystemMonitor::ActionProcess( tagACTION action, LPCTSTR lpszFileSrc, LPCTSTR lpszFileDst )
{
     switch (action)
    {
     case Added:
        AfxMessageBox(_T( "Added!" ));
         break ;
     case Removed:
        AfxMessageBox(_T( "Removed!" ));
         break ;
     case Modified:
        AfxMessageBox(_T( "Modified!" ));
         break ;
     case Renamed:
        AfxMessageBox(_T( "Renamed!" ));
         break ;
     default :
         break ;
    }
}

　　一个Demo，仅供参考，欢迎改进！