能说说这么做的目的吗?

程序代码:#include <windows.h>
#include <iostream>
#include <cstdio>
int main(int argc, char* argv[]) {
// 检查参数数量
if (argc != 3) {
std::cerr << "用法: " << argv[0] << " <文件名> \"<YYYY-MM-DD HH:MM:SS>\"" << std::endl;
return 1;
}
// 解析时间参数
SYSTEMTIME st = {0};
int year, month, day, hour, minute, second;
if (sscanf(argv[2], "%d-%d-%d %d:%d:%d",
&year, &month, &day, &hour, &minute, &second) != 6) {
std::cerr << "时间格式错误,请使用: YYYY-MM-DD HH:MM:SS" << std::endl;
return 1;
}
// 填充SYSTEMTIME结构
st.wYear = year;
st.wMonth = month;
st.wDay = day;
st.wHour = hour;
st.wMinute = minute;
st.wSecond = second;
st.wMilliseconds = 0; // 毫秒设为0
// 打开文件
HANDLE hFile = CreateFile(
argv[1], // 文件名来自参数
GENERIC_WRITE,
FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
if (hFile == INVALID_HANDLE_VALUE) {
std::cerr << "无法打开文件: " << GetLastError() << std::endl;
return 1;
}
// 转换时间格式
FILETIME ftCreation, ftLastAccess, ftLastWrite;
if (!SystemTimeToFileTime(&st, &ftCreation) ||
!SystemTimeToFileTime(&st, &ftLastAccess) ||
!SystemTimeToFileTime(&st, &ftLastWrite)) {
std::cerr << "时间转换失败: " << GetLastError() << std::endl;
CloseHandle(hFile);
return 1;
}
// 设置文件时间
if (!SetFileTime(hFile, &ftCreation, &ftLastAccess, &ftLastWrite)) {
std::cerr << "无法设置文件时间: " << GetLastError() << std::endl;
CloseHandle(hFile);
return 1;
}
CloseHandle(hFile);
std::cout << "文件时间设置成功。" << std::endl;
return 0;
}