监视文件夹的action[文件增加，修改，删除，重命名等]

Posted 2022-05-21 zeqi1991

void WatchFile()

    DWORD cbBytes = 0;
    char file_name[MAX_PATH] = 0;
    char notify[1024] = 0;
    int count = 0;
    TCHAR* dir = _T("D:\\\\");
    std::string s = "D:";
    HANDLE dirHandle = ::CreateFile(dir, GENERIC_READ | GENERIC_WRITE | FILE_LIST_DIRECTORY,
        FILE_SHARE_READ | FILE_SHARE_WRITE,
        NULL,
        OPEN_EXISTING,
        FILE_FLAG_BACKUP_SEMANTICS,
        NULL);
    if (dirHandle == INVALID_HANDLE_VALUE)
    
        return;
    
    memset(notify, 0, strlen(notify));
    FILE_NOTIFY_INFORMATION* pnotify = reinterpret_cast<FILE_NOTIFY_INFORMATION*>(notify);
    while (true)
    
        if (::ReadDirectoryChangesW(dirHandle, &notify, 1024, true,
            FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_SIZE,
            &cbBytes, NULL, NULL))
        
            pnotify = (FILE_NOTIFY_INFORMATION*)notify;
            //转换文件名为多字节字符串;
            if (pnotify != nullptr && pnotify->FileName != nullptr)
            
                ZeroMemory(file_name, sizeof(char) * MAX_PATH);
                int ret = ::WideCharToMultiByte(CP_ACP, 0, pnotify->FileName, pnotify->FileNameLength / 2, file_name, 99, NULL, NULL);
                if (ret == 0)
                
                    DWORD err = ::GetLastError();
                
            
            if ((pnotify->Action == FILE_ACTION_ADDED) ||
                (pnotify->Action == FILE_ACTION_REMOVED) ||
                (pnotify->Action == FILE_ACTION_RENAMED_OLD_NAME) ||
                (pnotify->Action == FILE_ACTION_MODIFIED))
            
                //如果发生了这些事件的话需要重新扫描当前的目录文件
                //就需要获取当前的目录名称
                std::string dirpath = s + "\\\\" + file_name;
            
        
    
    ::CloseHandle(dirHandle);


int main(int argc, char* argv[])

    WatchFile();
    return 0;