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C# 整合 Microsoft Agent 實現 TTS 語音合成

編輯：關於C#

前言

Microsoft Agent 是早期 Windows 平台提供的動畫角色互動技術，支援文字轉語音（TTS）與語音辨識。雖然已停止更新，但在維護舊系統或特定嵌入式案例中仍具參考價值。本文說明如何在 C# 中透過 COM Interop 呼叫 Agent 控制項，載入角色並實現語音輸出。

必要元件與環境準備

2.1 必須安裝的組件

Microsoft Agent 核心執行元件
角色檔案：Genie、Merlin、Robby、Peedy（.acs 檔）
Microsoft Speech API (SAPI) 5.1 執行環境
Lernout & Hauspie TTS 引擎（中文需額外安裝語言包）

下載位址：Microsoft Agent 官方下載頁

2.2 .NET 專案設定

Agent 控制項為 ActiveX 元件，需使用 AxImp.exe 產生互通組件：

AxImp.exe agentctl.dll

將產生 AxAgentObjects.dll（Windows Forms 包裝）與 AgentObjects.dll（COM 介面），加入專案參考即可使用。

核心程式碼實作

3.1 載入與顯示角色

using AgentObjects;
using AxAgentObjects;

public class AgentController
{
    private AxAgent _axAgent;
    private IAgentCtlCharacterEx _character;

    public AgentController(AxAgent axAgentControl)
    {
        _axAgent = axAgentControl;
    }

    public void LoadCharacter(string characterId, string acsPath)
    {
        _axAgent.Characters.Load(characterId, acsPath);
        _character = _axAgent.Characters[characterId];
        _character.LanguageID = 0x0409; // 美式英語
        _character.Show(null);
    }

    public void Speak(string text)
    {
        _character?.Speak(text, null);
    }

    public void PlayAnimation(string animationName)
    {
        _character?.Play(animationName);
    }
}

3.2 完整視窗應用程式範例

using System;
using System.Drawing;
using System.Windows.Forms;
using AgentObjects;
using AxAgentObjects;

public class AgentDemoForm : Form
{
    private AxAgent _axAgent;
    private IAgentCtlCharacterEx _character;
    private TextBox _txtInput;
    private Button _btnLoad, _btnSpeak;

    public AgentDemoForm()
    {
        InitializeComponent();
    }

    private void InitializeComponent()
    {
        _axAgent = new AxAgent();
        ((System.ComponentModel.ISupportInitialize)_axAgent).BeginInit();

        _txtInput = new TextBox { Location = new Point(12, 12), Size = new Size(300, 100), Multiline = true };
        _btnLoad = new Button { Text = "載入角色", Location = new Point(12, 120), Size = new Size(100, 30) };
        _btnSpeak = new Button { Text = "朗讀", Location = new Point(120, 120), Size = new Size(80, 30) };

        _btnLoad.Click += BtnLoad_Click;
        _btnSpeak.Click += BtnSpeak_Click;

        this.Controls.AddRange(new Control[] { _txtInput, _btnLoad, _btnSpeak, _axAgent });
        this.Text = "Microsoft Agent TTS Demo";
        this.ClientSize = new Size(340, 180);

        ((System.ComponentModel.ISupportInitialize)_axAgent).EndInit();
    }

    private void BtnLoad_Click(object sender, EventArgs e)
    {
        using OpenFileDialog dlg = new OpenFileDialog
        {
            Filter = "Agent Characters (*.acs)|*.acs",
            InitialDirectory = @"C:\Windows\MSAgent\Chars"
        };
        if (dlg.ShowDialog() == DialogResult.OK)
        {
            try { _axAgent.Characters.Unload("Char"); } catch { }
            _axAgent.Characters.Load("Char", dlg.FileName);
            _character = _axAgent.Characters["Char"];
            _character.LanguageID = 0x0409;
            _character.Show(null);
            _character.Play("Announce");
        }
    }

    private void BtnSpeak_Click(object sender, EventArgs e)
    {
        if (!string.IsNullOrWhiteSpace(_txtInput.Text))
            _character?.Speak(_txtInput.Text, null);
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new AgentDemoForm());
    }
}