文件监控——ReadDirecotryChangesW

//开启监控按钮
void CFileMonitDlg::OnBnClickedButton1()
{
    // TODO: 在此添加控件通知处理程序代码

    UpdateData(TRUE);

    //检测文件是否存在
    if (GetFileAttributes(m_Edit_Path) == INVALID_FILE_ATTRIBUTES)
    {
        MessageBox(_T("文件不存在 请重试！"));
        return;
    }

    USES_CONVERSION;
    //创建线程
    CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)MonitorFileThreadProc, this, 0, NULL);

    return;
}


// 目录监控多线程
UINT MonitorFileThreadProc(LPVOID lpVoid)
{
    CFileMonitDlg* ptrData = (CFileMonitDlg*)lpVoid;
    CString temp;
    temp = ptrData->m_Edit_Path + L"\\";

    // 打开目录, 获取文件句柄
    HANDLE hDirectory = ::CreateFile(temp.GetBuffer(), FILE_LIST_DIRECTORY,
        FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
        FILE_FLAG_BACKUP_SEMANTICS, NULL);
    if (INVALID_HANDLE_VALUE == hDirectory)
    {

        MessageBoxA(0, "CreateFileA Error", "Error", MB_OK);
        return 1;
    }

    DWORD dwBufferSize = 4096;
    // 申请一个足够大的缓冲区 
    BYTE* pBuf = new BYTE[dwBufferSize];
    if (NULL == pBuf)
    {
        MessageBoxA(0, "new Error", "Error", MB_OK);
        return 2;
    }

    FILE_NOTIFY_INFORMATION* pFileNotifyInfo = (FILE_NOTIFY_INFORMATION *)pBuf;
    
    BOOL bRet = FALSE;
    DWORD dwRet = 0;
    CString res = L"";
    // 开始循环设置监控
    do
    {
        ::RtlZeroMemory(pFileNotifyInfo, dwBufferSize);
        // 设置监控目录
        bRet = ::ReadDirectoryChangesW(hDirectory,
            pFileNotifyInfo,
            dwBufferSize,
            TRUE,
            FILE_NOTIFY_CHANGE_FILE_NAME |
            FILE_NOTIFY_CHANGE_ATTRIBUTES |
            FILE_NOTIFY_CHANGE_LAST_WRITE,
            &dwRet,
            NULL, NULL);
        if (FALSE == bRet)
        {
            MessageBoxA(0, "ReadDirectoryChangesW Error", "Error", MB_OK);
            break;
        }

        // 判断操作类型并显示
        switch (pFileNotifyInfo->Action)
        {
            //新增文件
        case FILE_ACTION_ADDED:
        {
            temp.Format(_T("%s:%s\r\n"), _T("新增文件"), pFileNotifyInfo->FileName);
            res += temp + L"\r\n";
            break;
        }
            //删除文件
        case FILE_ACTION_REMOVED:
        {
            temp.Format(_T("%s:%s\r\n"), _T("删除文件"), pFileNotifyInfo->FileName);
            res += temp + L"\r\n";
            break;
        }
            //修改文件
        case FILE_ACTION_MODIFIED:
        {
            temp.Format(_T("%s:%s\r\n"), _T("修改文件"), pFileNotifyInfo->FileName);
            res += temp + L"\r\n";
            break;
        }
            //重命名文件
        case FILE_ACTION_RENAMED_OLD_NAME:
        {
            temp.Format(_T("%s:%s\r\n"), _T("重命名前文件"), pFileNotifyInfo->FileName);
            res += temp + L"\r\n";
            break;
        }
        case FILE_ACTION_RENAMED_NEW_NAME:
        {
            temp.Format(_T("%s:%s\r\n"), _T("重命名后文件"), pFileNotifyInfo->FileName);
            res += temp + L"\r\n";
            break;
        }
        default:
            break;
        }

        SetDlgItemText(ptrData->m_hWnd,IDC_EDIT2, res);

    } while (bRet);



    // 关闭句柄, 释放内存
    CloseHandle(hDirectory);
    delete[] pBuf;

    return 0;
}