ReadDirectoryChangesW 监控文件夹 (一个简单的监控示例程序)（文件被修改了，也可以探测到）
- // .h文件
- #pragma once
- typedef void (*PFN_NotifyAction)(DWORD dwAction, LPWSTR szFile, DWORD dwLength);
- class CDirectoryWatch
- {
- public:
- CDirectoryWatch(void);
- virtual ~CDirectoryWatch(void);
- public:
- BOOL StartDirectoryWatch(LPCTSTR lpszDirectory, PFN_NotifyAction pFn_NotifyAction);
- BOOL StopDirectoryWatch(void);
- private:
- static UINT __cdecl ThreadProc(LPVOID lParam);
- static UINT __cdecl DirectoryWatch(LPVOID lParam);
- private:
- HANDLE m_hFile;
- CWinThread* m_pThread;
- TCHAR m_szDirectory[MAX_PATH];
- };
- // .cpp文件
- #include "StdAfx.h"
- #include "DirectoryWatch.h"
- #include <strsafe.h>
- typedef enum
- {
- MSG_STARTWATCH = (WM_USER + 0x11),
- MSG_STOPWATCH,
- MSG_EXITTHREAD
- };
- #define MAX_BUFFER_SIZE (1024)
- typedef struct _tagWATCHPARAMETERS
- {
- _tagWATCHPARAMETERS()
- {
- hFile = INVALID_HANDLE_VALUE;
- hEvent = NULL;
- memset(&ol, 0, sizeof(OVERLAPPED));
- pBuffer = NULL;
- dwBufferSize = 0;
- bExit = FALSE;
- pFn_NotifyAction = NULL;
- }
- HANDLE hFile;
- HANDLE hEvent;
- OVERLAPPED ol;
- BYTE* pBuffer;
- DWORD dwBufferSize;
- BOOL bExit;
- PFN_NotifyAction pFn_NotifyAction;
- }WATCH_PARAMETERS, *PWATCH_PARAMETERS;
- CDirectoryWatch::CDirectoryWatch() : m_hFile(INVALID_HANDLE_VALUE), m_pThread(NULL)
- {
- memset(m_szDirectory, 0, sizeof(m_szDirectory));
- m_pThread = AfxBeginThread(ThreadProc, NULL, 0, CREATE_SUSPENDED, 0, NULL);
- if(NULL == m_pThread)
- {
- TRACE("Error Code : %d\n", GetLastError());
- return ;
- }
- m_pThread->m_bAutoDelete = FALSE;
- m_pThread->ResumeThread();
- }
- CDirectoryWatch::~CDirectoryWatch()
- {
- if(INVALID_HANDLE_VALUE != m_hFile)
- {
- CloseHandle(m_hFile);
- m_hFile = INVALID_HANDLE_VALUE;
- }
- if((NULL != m_pThread) && (NULL != m_pThread->m_hThread))
- {
- m_pThread->PostThreadMessage(MSG_EXITTHREAD, 0, 0);
- WaitForSingleObject(m_pThread->m_hThread, INFINITE);
- delete m_pThread;
- m_pThread = NULL;
- }
- }
- BOOL CDirectoryWatch::StartDirectoryWatch(LPCTSTR lpszDirectory, PFN_NotifyAction pFn_NotifyAction)
- {
- if(NULL == m_pThread)
- {
- return FALSE;
- }
- if(NULL == lpszDirectory)
- {
- return FALSE;
- }
- if(NULL == pFn_NotifyAction)
- {
- return FALSE;
- }
- if(!PathFileExists(lpszDirectory))
- {
- TRACE("Error Code : %d\n", GetLastError());
- return FALSE;
- }
- if(!PathIsDirectory(lpszDirectory))
- {
- TRACE("Error Code : %d\n", GetLastError());
- return FALSE;
- }
- if(0 == _tcslen(m_szDirectory))
- {
- StringCchPrintf(m_szDirectory, _countof(m_szDirectory), _T("%s"), lpszDirectory);
- }
- else if(CSTR_EQUAL != CompareStringOrdinal(m_szDirectory, -1, lpszDirectory, -1, TRUE))
- {
- TRACE("Not Change Directory.\n");
- return FALSE;
- }
- if(INVALID_HANDLE_VALUE == m_hFile)
- {
- m_hFile = CreateFile(lpszDirectory, FILE_LIST_DIRECTORY, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
- NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, NULL);
- if(INVALID_HANDLE_VALUE == m_hFile)
- {
- TRACE("Error Code : %d\n", GetLastError());
- return FALSE;
- }
- }
- return m_pThread->PostThreadMessage(MSG_STARTWATCH, (WPARAM)m_hFile, (LPARAM)pFn_NotifyAction);
- }
- BOOL CDirectoryWatch::StopDirectoryWatch()
- {
- if(NULL != m_pThread)
- {
- return m_pThread->PostThreadMessage(MSG_STOPWATCH, 0, 0);
- }
- return FALSE;
- }
- UINT __cdecl CDirectoryWatch::DirectoryWatch(LPVOID lParam)
- {
- WATCH_PARAMETERS* pParam = (WATCH_PARAMETERS*)lParam;
- if(NULL == pParam)
- {
- return 0;
- }
- HANDLE& hFile = pParam->hFile;
- BYTE* pBuffer = pParam->pBuffer;
- DWORD dwBufferSize = pParam->dwBufferSize;
- OVERLAPPED& ol = pParam->ol;
- HANDLE& hEvent = pParam->hEvent;
- BOOL& bExit = pParam->bExit;
- PFN_NotifyAction pFn_NotifyAction = pParam->pFn_NotifyAction;
- DWORD dwBytesReturn = 0;
- DWORD dwRet = WAIT_FAILED;
- DWORD dwOffSet = 0;
- TCHAR szFile[MAX_PATH] = {0};
- while(TRUE)
- {
- if(WAIT_OBJECT_0 != WaitForSingleObject(hEvent, INFINITE))
- {
- TRACE("Error Code : %d\n", GetLastError());
- break;
- }
- if(bExit)
- {
- break;
- }
- if(!ReadDirectoryChangesW(hFile, pBuffer, dwBufferSize, 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, &dwBytesReturn, &ol, NULL))
- {
- TRACE("Error Code : %d\n", GetLastError());
- break;
- }
- if(!GetOverlappedResult(hFile, &ol, &dwBytesReturn, TRUE))
- {
- TRACE("Error Code : %d\n", GetLastError());
- break;
- }
- FILE_NOTIFY_INFORMATION* pFileNotify = (FILE_NOTIFY_INFORMATION*)pBuffer;
- do
- {
- if(pFn_NotifyAction && (WAIT_OBJECT_0 == WaitForSingleObject(hEvent, 0)))
- {
- pFn_NotifyAction(pFileNotify->Action, pFileNotify->FileName, (pFileNotify->FileNameLength) / sizeof(WCHAR));
- }
- dwOffSet = pFileNotify->NextEntryOffset;
- pFileNotify = (FILE_NOTIFY_INFORMATION*)((BYTE*)pFileNotify + dwOffSet);
- } while (dwOffSet);
- }
- TRACE0("DirectoryWatch Thread Exit ... \n");
- return 0;
- }
- UINT __cdecl CDirectoryWatch::ThreadProc(LPVOID lParam)
- {
- WATCH_PARAMETERS* pParam = new WATCH_PARAMETERS;
- if(NULL == pParam)
- {
- goto __CLEANUP__;
- }
- BYTE* pBuffer = new BYTE[MAX_BUFFER_SIZE];
- if(NULL == pBuffer)
- {
- goto __CLEANUP__;
- }
- memset(pBuffer, 0, MAX_BUFFER_SIZE);
- pParam->pBuffer = pBuffer;
- pParam->dwBufferSize = MAX_BUFFER_SIZE;
- HANDLE hWatchEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
- if(NULL == hWatchEvent)
- {
- goto __CLEANUP__;
- }
- pParam->ol.hEvent = hWatchEvent;
- CWinThread* pThread = NULL;
- HANDLE hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
- if(NULL == hEvent)
- {
- goto __CLEANUP__;
- }
- pParam->hEvent = hEvent;
- MSG msg;
- while(GetMessage(&msg, NULL, 0, 0))
- {
- switch(msg.message)
- {
- case MSG_STARTWATCH:
- {
- HANDLE hFile = (HANDLE)(msg.wParam);
- PFN_NotifyAction pFn_NotifyAction = (PFN_NotifyAction)(msg.lParam);
- if((INVALID_HANDLE_VALUE == hFile) && (NULL == pFn_NotifyAction))
- {
- break;
- }
- if(NULL == pThread)
- {
- pParam->hFile = hFile;
- pParam->pFn_NotifyAction = pFn_NotifyAction;
- pThread = AfxBeginThread(DirectoryWatch, (LPVOID)pParam, 0, CREATE_SUSPENDED, NULL);
- if(NULL == pThread)
- {
- goto __CLEANUP__;
- }
- pThread->m_bAutoDelete = FALSE;
- pThread->ResumeThread();
- }
- SetEvent(hEvent);
- }
- break;
- case MSG_STOPWATCH:
- {
- ResetEvent(hEvent);
- }
- break;
- case MSG_EXITTHREAD:
- {
- SetEvent(hEvent);
- pParam->bExit = FALSE;
- if((NULL != pThread) && (NULL != pThread->m_hThread))
- {
- WaitForSingleObject(pThread->m_hThread, INFINITE);
- delete pThread;
- pThread = NULL;
- }
- goto __CLEANUP__;
- }
- default:
- break;
- }
- TranslateMessage(&msg);
- DispatchMessage(&msg);
- }
- __CLEANUP__:
- if(NULL != hWatchEvent)
- {
- CloseHandle(hWatchEvent);
- hWatchEvent = NULL;
- }
- if(NULL != pBuffer)
- {
- delete[] pBuffer;
- pBuffer = NULL;
- }
- if(NULL != pParam)
- {
- delete pParam;
- pParam = NULL;
- }
- TRACE0("ThreadProc Thread Exit ...\n");
- return 0;
- }
- // 测试代码
- #include "stdafx.h"
- #include "DirectoryWatch.h"
- void NotifyAction(DWORD dwAction, LPWSTR szFile, DWORD dwLength)
- {
- switch(dwAction)
- {
- case FILE_ACTION_ADDED:
- wprintf(L"FILE_ACTION_ADDED: \n\t");
- break;
- case FILE_ACTION_REMOVED:
- wprintf(L"FILE_ACTION_REMOVED: \n\t");
- break;
- case FILE_ACTION_MODIFIED:
- wprintf(L"FILE_ACTION_MODIFIED: \n\t");
- break;
- case FILE_ACTION_RENAMED_OLD_NAME:
- wprintf(L"FILE_ACTION_RENAMED_OLD_NAME: \n\t");
- break;
- case FILE_ACTION_RENAMED_NEW_NAME:
- wprintf(L"FILE_ACTION_RENAMED_NEW_NAME: \n\t");
- break;
- default:
- break;
- }
- WCHAR szPath[MAX_PATH] = {0};
- wmemcpy(szPath, szFile, min(dwLength, MAX_PATH));
- wprintf(L"%s\n", szPath);
- }
- int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
- {
- CDirectoryWatch watch;
- wprintf(L"Start Directory Watch ...\n");
- watch.StartDirectoryWatch(_T("F:\\11"), NotifyAction);
- Sleep(30 * 1000);
- watch.StopDirectoryWatch();
- wprintf(L"Stop Directory Watch ...\n");
- Sleep(10 * 1000);
- wprintf(L"Start Directory Watch ...\n");
- watch.StartDirectoryWatch(_T("F:\\11"), NotifyAction);
- Sleep(30 * 1000);
- watch.StopDirectoryWatch();
- wprintf(L"Stop Directory Watch ...\n");
- Sleep(30 * 1000);
- wprintf(L"Process Exit ...\n");
- return 0;
- }
效果如下图所示：
http://blog.csdn.net/visualeleven/article/details/7562014
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