Windows Batch Get Current Date As FileName

2024-08-15

筆記如何將當前日期作為檔案名稱，需要特別筆記的原因是因為繁體中文的日期格式需要有特殊的處理 🐸

說明

set today=%date:~0,4%%date:~5,2%%date:~8,2%
set destination=d:\home\%today%
mkdir %destination%

取得檔案資訊

🐌 Slow on Get-FileHash

Get-ChildItem -Path "D:\source" -Recurse | 
    Select-Object FullName, 
                  @{Name="Size";Expression={$_.Length}}, 
                  @{Name="LastModifiedDate";Expression={$_.LastWriteTime}},
                  @{Name="Hash";Expression={ (Get-FileHash -Path $_.FullName).Hash }} |
    Format-Table -AutoSize | 
    Out-File -FilePath "C:\users\ps.txt"

⚡ Quick with multi-threading to get file hash

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Security.Cryptography;
using System.Threading;
using System.Threading.Tasks;

namespace GetFileMetaConsole
{
    class Program
    {
        static void Main()
        {
            ThreadPool.SetMinThreads(16, 16);
            ThreadPool.SetMaxThreads(16, 16);

            // Example list of file paths
            List<string> filePaths = new List<string>();

            // Read txt file line by line to filePaths
            using (StreamReader reader = new StreamReader("filePaths.txt"))
            {
                string line;
                while ((line = reader.ReadLine()) != null)
                {
                    filePaths.Add(line);
                }
            }

            // Start measuring time
            Stopwatch stopwatch = Stopwatch.StartNew();

            using (StreamWriter writer = new StreamWriter("result.txt"))
            {
                // Create tasks for each file path
                List<Task<string>> tasks = new List<Task<string>>();
                foreach (var filePath in filePaths)
                {
                    tasks.Add(Task.Run(() => GetFileDetails(filePath)));
                }

                // Wait for all tasks to complete
                Task.WaitAll(tasks.ToArray());

                // Write the file details to the result file
                foreach (var task in tasks)
                {
                    writer.WriteLine(task.Result);
                }
            }

            // Stop measuring time
            stopwatch.Stop();

            // Print the total time taken
            Console.WriteLine($"Total time used: {stopwatch.Elapsed.TotalSeconds} seconds");
        }

        static string GetFileDetails(string filePath)
        {
            if (!File.Exists(filePath))
            {
                return $"File not found: {filePath}";
            }

            FileInfo fileInfo = new FileInfo(filePath);

            // Get file size
            long fileSize = fileInfo.Length;

            // Get last modified date
            DateTime lastModified = fileInfo.LastWriteTime;

            // Get SHA256 hash
            string hash;
            using (FileStream stream = File.OpenRead(filePath))
            {
                SHA256 sha = SHA256.Create();
                byte[] hashBytes = sha.ComputeHash(stream);
                hash = BitConverter.ToString(hashBytes).Replace("-", "");
            }

            // Return details
            return $"File: {filePath}\nSize: {fileSize} bytes\nLast Modified: {lastModified.ToString("yyyy/MM/dd hh:MM:ss")}\nSHA256: {hash}\n";
        }
    }

}