filemonitor

最新推荐文章于 2025-03-30 00:10:56 发布

zcg19

最新推荐文章于 2025-03-30 00:10:56 发布

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分类专栏： windows编程文章标签： file action null class delete path

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本文介绍了一个使用C++实现的目录监控类CDirectoryMonitor。该类通过创建线程并利用Windows API函数ReadDirectoryChangesW来监听指定目录下的文件变化，如文件添加、删除、修改等，并实时打印出这些操作。

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#define _WIN32_WINNT 0x0400 #include #include #include HANDLE GcCreateThread(unsigned (__stdcall *start_address)(void *), char* param, unsigned* thrdaddr) { return (HANDLE)_beginthreadex(NULL, 0, start_address, param, 0, thrdaddr); } #define Locate(type, begin, offset) (type)((char*)(begin) + (offset)) class CDirectoryMonitor { public: CDirectoryMonitor(char* szDir) { strcpy(m_szDir, szDir); Init(); } ~CDirectoryMonitor() { this->WaitForExit(); } private: char m_szDir[MAX_PATH]; // no use ... char* m_pFileChangeList; private: int Init() { // ... m_hDirectory = CreateFileA(m_szDir, FILE_LIST_DIRECTORY, FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, NULL); unsigned int nThrdAddr = 0; m_hThread = GcCreateThread(MonitorProc, NULL, &nThrdAddr); return 0; } int WaitForExit() { #ifdef _DEBUG printf("enter WaitForExit()/n"); #endif // if(m_hDirectory != NULL) { CloseHandle(m_hDirectory); m_hDirectory = NULL; } if(m_hThread != NULL) { WaitForSingleObject(m_hThread, INFINITE); m_hThread = NULL; } #ifdef _DEBUG printf("outer WaitForExit()/n"); #endif return 0; } static unsigned __stdcall MonitorProc(void* param) { while(1) { // char* szBuf[1024] = {0}; DWORD dwNotifyFilter = FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_CREATION | FILE_NOTIFY_CHANGE_SECURITY; DWORD nByteReturned = 0; int ret = ReadDirectoryChangesW(m_hDirectory, szBuf, sizeof(szBuf), true, dwNotifyFilter, &nByteReturned, NULL, NULL); if(ret == 0) { if(ERROR_INVALID_HANDLE == GetLastError()) { printf("............break/n"); break; } } // 下面的循环处理的是一个消息， // 比如说“重命名”，它会有多个FILE_NOTIFY_INFORMATION； // 而对于“保存”，它将会有2个FILE_ACTION_MODIFIED，是因为改变了属性， // 但并不是在下面的一个循环中处理，它会分两次ReadDirectoryChangesW发过来 FILE_NOTIFY_INFORMATION* lpfni = (FILE_NOTIFY_INFORMATION*)szBuf; do { switch(lpfni->Action) { case FILE_ACTION_ADDED: wprintf(L"add, fileName = %s/n", lpfni->FileName); break; case FILE_ACTION_REMOVED: wprintf(L"remove, fileName = %s/n", lpfni->FileName); break; case FILE_ACTION_MODIFIED: wprintf(L"modify, fileName = %s/n", lpfni->FileName); break; case FILE_ACTION_RENAMED_OLD_NAME: wprintf(L"rename, old_fileName = %s/n", lpfni->FileName); break; case FILE_ACTION_RENAMED_NEW_NAME: wprintf(L"rename, new_fileName = %s/n", lpfni->FileName); break; default: break; } }while(lpfni->NextEntryOffset != 0 && (lpfni = Locate(FILE_NOTIFY_INFORMATION*, lpfni, lpfni->NextEntryOffset)) != 0); } return 0; } private: HANDLE m_hThread; // static HANDLE m_hDirectory; }; HANDLE CDirectoryMonitor::m_hDirectory = NULL; void Test() { class CDirectoryMonitor dm("D://"); getchar(); //Sleep(1* 60 * 1000); } void main() { Test(); getchar(); }