AWSConfig版.NetBedrockテストプログラム

.csファイル

using System.Text;
using System.Text.Json;
using Amazon;
using Amazon.BedrockRuntime;
using Amazon.BedrockRuntime.Model;

namespace BedrockImageGUI;

public class Form1 : Form
{
    TextBox txtPrompt = new()
    {
        Multiline = true,
        ScrollBars = ScrollBars.Vertical,
        Height = 80,
        Text = "この画像について詳しく説明してください。v3",
        Dock = DockStyle.Top
    };

    PictureBox pic = new()
    {
        Height = 240,
        SizeMode = PictureBoxSizeMode.Zoom,
        Dock = DockStyle.Top,
        BorderStyle = BorderStyle.FixedSingle
    };

    Button btnImage = new() { Text = "画像を選ぶ", Dock = DockStyle.Top };
    Button btnSend  = new() { Text = "送信（Claude）", Dock = DockStyle.Top };

    TextBox txtOutput = new()
    {
        Multiline = true,
        ScrollBars = ScrollBars.Vertical,
        ReadOnly = true,
        Dock = DockStyle.Fill
    };

    string imagePath = "";

    public Form1()
    {
        Text = "Claude × Claude Vision（最小GUI）";
        Width = 900;
        Height = 700;

        Controls.Add(txtOutput);
        Controls.Add(btnSend);
        Controls.Add(btnImage);
        Controls.Add(pic);
        Controls.Add(txtPrompt);

        btnImage.Click += (_, _) =>
        {
            using var ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                imagePath = ofd.FileName;
                pic.Image = Image.FromFile(imagePath);
            }
        };

        btnSend.Click += async (_, _) => await SendAsync();
    }

    async Task SendAsync()
    {
        if (string.IsNullOrEmpty(imagePath))
        {
            MessageBox.Show("先に画像を選択してください。");
            return;
        }

        btnSend.Enabled = false;
        var oldText = btnSend.Text;
        btnSend.Text = "送信中…";
        txtOutput.Text = "実行中…";

        try
        {
            var base64Image = Convert.ToBase64String(File.ReadAllBytes(imagePath));
            var mediaType = GetMediaType(imagePath);

            // ★ 送信順は「テキスト → 画像」（元コードのまま）
            var messages = new[]
            {
                new Dictionary<string, object>
                {
                    ["role"] = "user",
                    ["content"] = new List<Dictionary<string, object>>
                    {
                        new() { ["type"] = "text", ["text"] = txtPrompt.Text },
                        new()
                        {
                            ["type"] = "image",
                            ["source"] = new Dictionary<string, string>
                            {
                                ["type"] = "base64",
                                ["media_type"] = mediaType,
                                ["data"] = base64Image
                            }
                        }
                    }
                }
            };

            var payload = new Dictionary<string, object>
            {
                ["anthropic_version"] = "bedrock-2023-05-31",
                ["max_tokens"] = 1024,
                ["messages"] = messages
            };

            var request = new InvokeModelRequest
            {
                Body = new MemoryStream(Encoding.UTF8.GetBytes(JsonSerializer.Serialize(payload))),
                ContentType = "application/json",
                Accept = "application/json",
                ModelId = "anthropic.claude-3-sonnet-20240229-v1:0"
            };

            var client = new AmazonBedrockRuntimeClient(RegionEndpoint.USEast1);
            var response = await client.InvokeModelAsync(request);

            using var reader = new StreamReader(response.Body);
            var json = await reader.ReadToEndAsync();

            // ★ 改行ありで表示：content配列のtext要素をすべて結合し、\n→環境改行に
            var root = JsonDocument.Parse(json).RootElement;
            var content = root.GetProperty("content");

            var sb = new StringBuilder();
            foreach (var part in content.EnumerateArray())
            {
                if (part.TryGetProperty("type", out var t) && t.GetString() == "text")
                {
                    var piece = part.GetProperty("text").GetString() ?? "";
                    sb.AppendLine(piece);
                }
            }

            var text = sb.ToString();
            if (!string.IsNullOrEmpty(text))
            {
                text = text.Replace("\n", Environment.NewLine);
            }

            txtOutput.Text = text;
        }
        catch (Exception ex)
        {
            txtOutput.Text = $"エラー: {ex.Message}";
        }
        finally
        {
            btnSend.Text = oldText;
            btnSend.Enabled = true;
        }
    }

    static string GetMediaType(string path)
    {
        var ext = Path.GetExtension(path).ToLowerInvariant();
        return ext switch
        {
            ".png" => "image/png",
            ".jpg" or ".jpeg" => "image/jpeg",
            ".webp" => "image/webp",
            ".bmp" => "image/bmp",
            _ => "image/png"
        };
    }
}

program.cs

namespace BedrockImageGUI;

static class Program
{
    /// <summary>
    ///  The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main()
    {
        // To customize application configuration such as set high DPI settings or default font,
        // see https://aka.ms/applicationconfiguration.
        ApplicationConfiguration.Initialize();
        Application.Run(new Form1());
    }    
}

.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net8.0-windows</TargetFramework>
    <Nullable>enable</Nullable>
    <UseWindowsForms>true</UseWindowsForms>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="AWSSDK.BedrockRuntime" Version="4.0.3.1" />
  </ItemGroup>

</Project>