C++监听文件夹下的添加、修改、删除文件事件

来源：互联网发布：菅野洋子抄袭知乎编辑：程序博客网时间：2024/05/17 07:18
#include <iostream>#include <windows.h>#include <tchar.h>#include <iomanip>using namespace std;void fileWatcher();int main(){    fileWatcher();    return 0;}void fileWatcher(){    DWORD cbBytes;    char file_name[MAX_PATH]; //设置文件名;    char file_rename[MAX_PATH]; //设置文件重命名后的名字;    char notify[1024];    int count = 0; //文件数量。可能同时拷贝、删除多个文件，可以进行更友好的提示;    TCHAR *dir = _T("D:\\FTP");    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) //若网络重定向或目标文件系统不支持该操作，函数失败，同时调用GetLastError()返回ERROR_INVALID_FUNCTION    {        cout << "error" + GetLastError() << endl;    }    memset(notify, 0, strlen(notify));    FILE_NOTIFY_INFORMATION *pnotify = (FILE_NOTIFY_INFORMATION*)notify;    cout << "Start Monitor..." << endl;    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))        {            //转换文件名为多字节字符串;            if (pnotify->FileName)            {                memset(file_name, 0, strlen(file_name));                WideCharToMultiByte(CP_ACP, 0, pnotify->FileName, pnotify->FileNameLength / 2, file_name, 99, NULL, NULL);            }            //获取重命名的文件名;            if (pnotify->NextEntryOffset != 0 && (pnotify->FileNameLength > 0 && pnotify->FileNameLength < MAX_PATH))            {                PFILE_NOTIFY_INFORMATION p = (PFILE_NOTIFY_INFORMATION)((char*)pnotify + pnotify->NextEntryOffset);                memset(file_rename, 0, sizeof(file_rename));                WideCharToMultiByte(CP_ACP, 0, p->FileName, p->FileNameLength / 2, file_rename, 99, NULL, NULL);            }            //设置类型过滤器,监听文件创建、更改、删除、重命名等;            switch (pnotify->Action)            {                case FILE_ACTION_ADDED:                    count++;                    cout << "count  = " << count << endl;                    cout << setw(5) << "file add:" << setw(5) << file_name << endl;                    break;                case FILE_ACTION_MODIFIED:                    cout << "file modified:" << setw(5) << file_name << endl;                    break;                case FILE_ACTION_REMOVED:                    count++;                    cout << count << setw(5) << "file removed:" << setw(5) << file_name << endl;                    break;                case FILE_ACTION_RENAMED_OLD_NAME:                    cout << "file renamed:" << setw(5) << file_name << "->" << file_rename << endl;                    break;                default:                    cout << "UNknow command!" << endl;            }        }    }    CloseHandle(dirHandle);}
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