可能是以下原因导致ReadDirectoryChangesW无法 调用 回调 函数 ：

下面是一个示例代码，展示了如何正确使用ReadDirectoryChangesW和回调 函数 ：

#include <Windows.h>
#include <iostream>
using namespace std;
void CALLBACK DirectoryCallback(DWORD dwErrorCode, DWORD dwNumberOfBytesTransfered, LPOVERLAPPED lpOverlapped)
    cout << "Directory changed!" << endl;
    // 重新等待目录变化通知
    ReadDirectoryChangesW(reinterpret_cast<HANDLE>(lpOverlapped->hEvent), lpOverlapped->lpBuffer,
                          lpOverlapped->hEvent ? 1 : 0, FALSE, FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_SIZE, nullptr, lpOverlapped, DirectoryCallback);
int main()
    WCHAR buffer[MAX_PATH];
    GetCurrentDirectory(MAX_PATH, buffer);
    // 创建目录变化通知对象
    HANDLE hDirectory = CreateFileW(L".", FILE_LIST_DIRECTORY, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, nullptr);
    if (hDirectory == INVALID_HANDLE_VALUE)
        cerr << "Failed to create directory handle" << endl;
        return -1;
    // 开始等待目录变化通知
    OVERLAPPED overlapped;
    memset(&overlapped, 0, sizeof(overlapped));
    overlapped.hEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr);
    ReadDirectoryChangesW(hDirectory, buffer, MAX_PATH, FALSE, FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_SIZE, nullptr, &overlapped, DirectoryCallback);
    // 循环等待回调函数被调用
    while (true)
        SleepEx(INFINITE, TRUE);
    // 关闭目录变化通知对象
    CloseHandle(hDirectory);
    return 0;