VC++ 监视文件（夹）

　　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'';

            if(0 != pNotify->NextEntryOffset)
            {
                PFILE_NOTIFY_INFORMATION pNext = (PFILE_NOTIFY_INFORMATION)((char *)pNotify + pNotify->NextEntryOffset);
                pszFileDst = pNext->FileName;
                pszFileDst[pNext->FileNameLength / 2] = L'';
            }
            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！

　　百度云下载：http://pan.baidu.com/s/1c6c4eM 密码：t5a4

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原文地址：https://www.cnblogs.com/MakeView660/p/6963094.html