first commit

client/Reader/MainForm.Designer.cs

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+namespace Reader
+{
+    partial class MainForm
+    {
+        private System.ComponentModel.IContainer components = null;
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        private void InitializeComponent()
+        {
+            this.txtFolder = new System.Windows.Forms.TextBox();
+            this.btnBrowse = new System.Windows.Forms.Button();
+            this.btnRead = new System.Windows.Forms.Button();
+            this.dgv = new System.Windows.Forms.DataGridView();
+            ((System.ComponentModel.ISupportInitialize)(this.dgv)).BeginInit();
+            this.SuspendLayout();
+            // txtFolder
+            this.txtFolder.Location = new System.Drawing.Point(12, 30);
+            this.txtFolder.Name = "txtFolder";
+            this.txtFolder.Size = new System.Drawing.Size(360, 23);
+            // btnBrowse
+            this.btnBrowse.Location = new System.Drawing.Point(378, 28);
+            this.btnBrowse.Name = "btnBrowse";
+            this.btnBrowse.Size = new System.Drawing.Size(75, 25);
+            this.btnBrowse.Text = "浏览文件夹";
+            this.btnBrowse.UseVisualStyleBackColor = true;
+            this.btnBrowse.Click += new System.EventHandler(this.btnBrowse_Click);
+            // btnRead
+            this.btnRead.Location = new System.Drawing.Point(378, 170);
+            this.btnRead.Name = "btnRead";
+            this.btnRead.Size = new System.Drawing.Size(75, 27);
+            this.btnRead.Text = "开始读取";
+            this.btnRead.UseVisualStyleBackColor = true;
+            this.btnRead.Click += new System.EventHandler(this.btnRead_Click);
+            // dgv
+            this.dgv.AllowUserToAddRows = false;
+            this.dgv.AllowUserToDeleteRows = false;
+            this.dgv.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
+            this.dgv.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
+            new System.Windows.Forms.DataGridViewTextBoxColumn() { Name = "colFile", HeaderText = "文件名" },
+            new System.Windows.Forms.DataGridViewTextBoxColumn() { Name = "colUpload", HeaderText = "上传信息" },
+            new System.Windows.Forms.DataGridViewTextBoxColumn() { Name = "colDownload", HeaderText = "下载信息" },
+            new System.Windows.Forms.DataGridViewTextBoxColumn() { Name = "colTime", HeaderText = "暗码写入时间" }
+            });
+            this.dgv.Location = new System.Drawing.Point(12, 62);
+            this.dgv.Name = "dgv";
+            this.dgv.ReadOnly = true;
+            this.dgv.RowTemplate.Height = 25;
+            this.dgv.Size = new System.Drawing.Size(441, 100);
+            // MainForm
+            this.ClientSize = new System.Drawing.Size(465, 209);
+            this.Controls.Add(this.txtFolder);
+            this.Controls.Add(this.btnBrowse);
+            this.Controls.Add(this.dgv);
+            this.Controls.Add(this.btnRead);
+            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
+            this.MaximizeBox = false;
+            this.Name = "MainForm";
+            this.Text = "Reader - 读取暗码";
+            ((System.ComponentModel.ISupportInitialize)(this.dgv)).EndInit();
+            this.ResumeLayout(false);
+            this.PerformLayout();
+        }
+
+        private System.Windows.Forms.TextBox txtFolder;
+        private System.Windows.Forms.Button btnBrowse;
+        private System.Windows.Forms.Button btnRead;
+        private System.Windows.Forms.DataGridView dgv;
+    }
+}

client/Reader/MainForm.cs

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+using System;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Reader
+{
+    public partial class MainForm : Form
+    {
+        private static readonly HttpClient http = new HttpClient();
+        private const string ServerUrl = "http://localhost:5000";
+
+        public MainForm()
+        {
+            InitializeComponent();
+        }
+
+        private void btnBrowse_Click(object sender, EventArgs e)
+        {
+            using var fbd = new FolderBrowserDialog();
+            if (fbd.ShowDialog() == DialogResult.OK)
+            {
+                txtFolder.Text = fbd.SelectedPath;
+            }
+        }
+
+        private async void btnRead_Click(object sender, EventArgs e)
+        {
+            var folder = txtFolder.Text;
+            if (string.IsNullOrWhiteSpace(folder) || !Directory.Exists(folder))
+            {
+                MessageBox.Show("请选择有效的文件夹。", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return;
+            }
+            dgv.Rows.Clear();
+            var files = Directory.GetFiles(folder, "*", SearchOption.AllDirectories);
+            var shaList = new System.Collections.Generic.List<string>();
+            var fileMap = new System.Collections.Generic.Dictionary<string, string>();
+            foreach (var f in files)
+            {
+                try
+                {
+                    var sha = await Task.Run(() => ComputeSha256(f));
+                    shaList.Add(sha);
+                    fileMap[sha] = f;
+                }
+                catch { }
+            }
+            if (shaList.Count == 0)
+            {
+                MessageBox.Show("没有找到文件。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                return;
+            }
+            var payload = new { shas = shaList };
+            var content = new StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json");
+            var resp = await http.PostAsync(ServerUrl + "/read", content);
+            if (!resp.IsSuccessStatusCode)
+            {
+                MessageBox.Show("读取失败: " + await resp.Content.ReadAsStringAsync(), "失败", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+            }
+            var text = await resp.Content.ReadAsStringAsync();
+            using var doc = JsonDocument.Parse(text);
+            var root = doc.RootElement;
+            var data = root.GetProperty("data");
+            foreach (var sha in shaList)
+            {
+                var fileName = Path.GetFileName(fileMap[sha]);
+                if (data.TryGetProperty(sha, out var item) && item.ValueKind != JsonValueKind.Null)
+                {
+                    var up = item.GetProperty("upload_code").GetString() ?? "";
+                    var down = item.GetProperty("download_code").GetString() ?? "";
+                    var created = item.GetProperty("created_at").GetString() ?? "";
+                    dgv.Rows.Add(fileName, up, down, created);
+                }
+                else
+                {
+                    dgv.Rows.Add(fileName, "无", "无", "无");
+                }
+            }
+        }
+
+        private static string ComputeSha256(string filePath)
+        {
+            using var sha = SHA256.Create();
+            using var stream = File.OpenRead(filePath);
+            var hash = sha.ComputeHash(stream);
+            var sb = new StringBuilder();
+            foreach (var b in hash) sb.Append(b.ToString("x2"));
+            return sb.ToString();
+        }
+    }
+}

client/Reader/Program.cs

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+using System;
+using System.Windows.Forms;
+
+namespace Reader
+{
+    static class Program
+    {
+        [STAThread]
+        static void Main()
+        {
+            Application.SetHighDpiMode(HighDpiMode.SystemAware);
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new MainForm());
+        }
+    }
+}

client/Reader/Reader.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+</Project>