C++监听文件夹下的添加修改删除文件事件

Posted 2022-04-15 走过_冬天

#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);