使用SpeechSynthesis将文本转换为语音时，对.NET 4.5中WebAPI中的HTTP Get请求没有响应

我正在尝试使用WebAPI设置一个简单的web服务。以下是我的代码：

public class SpeakController : ApiController
    {
        //
        // api/speak

        public HttpResponseMessage Get(String textToConvert, String outputFile, string gender, string age = "Adult")
        {
            VoiceGender voiceGender = (VoiceGender)Enum.Parse(typeof(VoiceGender), gender);
            VoiceAge voiceAge = (VoiceAge)Enum.Parse(typeof(VoiceAge), age);

            using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())
            {
                synthesizer.SelectVoiceByHints(voiceGender, voiceAge);
                synthesizer.SetOutputToWaveFile(outputFile, new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
                synthesizer.Speak(textToConvert);
            }

            return Request.CreateResponse(HttpStatusCode.OK, new Response { HttpStatusCode = (int)HttpStatusCode.OK, Message = "Payload Accepted." });
        }
    }

这段代码相当直截了当，绝不是生产准备就绪。但在我的测试中，我注意到对控制器的任何请求都会发生以下情况：

• 成功生成WAV文件
• 在调试期间，我可以看到控件命中返回并退出该方法
• 然而，我的浏览器一直在旋转，我从来没有收到服务器的响应

我对Postman（Chrome的REST客户端）也做了同样的尝试，得到了同样的结果。虽然我确实希望这是一个阻塞调用，但为了尝试其他事情，我修改了

synthesizer.Speak

到

synthesizer.SpeakAsync

，并遇到了相同的问题

但是，当我像下面所示单独测试代码段时，代码按预期工作

用语音部分测试WebAPI调用注释掉：

public class SpeakController : ApiController
{
    //
    // api/speak

    public HttpResponseMessage Get(String textToConvert, String outputFile, string gender, string age = "Adult")
    {
        VoiceGender voiceGender = (VoiceGender)Enum.Parse(typeof(VoiceGender), gender);
        VoiceAge voiceAge = (VoiceAge)Enum.Parse(typeof(VoiceAge), age);

        //using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())
        //{
        //  synthesizer.SelectVoiceByHints(voiceGender, voiceAge);
        //  synthesizer.SetOutputToWaveFile(outputFile, new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
        //  synthesizer.Speak(textToConvert);
        //}

        return Request.CreateResponse(HttpStatusCode.OK, new Response { HttpStatusCode = (int)HttpStatusCode.OK, Message = "Payload Accepted." });
    }
}

static string usageInfo = "Invalid or no input arguments!"
    + "\n\nUsage: initiatives \"text to speak\" c:\\path\\to\\generate.wav gender"
    + "\nGender:\n\tMale or \n\tFemale"
    + "\n";

static void Main(string[] args)
{
    if (args.Length != 3)
    {
        Console.WriteLine(usageInfo);
    }
    else
    {
        ConvertStringToSpeechWav(args[0], args[1], (VoiceGender)Enum.Parse(typeof(VoiceGender), args[2]));
    }

    Console.WriteLine("Press any key to continue...");
    Console.ReadLine();
}

static void ConvertStringToSpeechWav(String textToConvert, String pathToCreateWavFile, VoiceGender gender, VoiceAge age = VoiceAge.Adult)
{
    using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())
    {
        synthesizer.SelectVoiceByHints(gender, age);
        synthesizer.SetOutputToWaveFile(pathToCreateWavFile, new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
        synthesizer.Speak(textToConvert);
    }
}

在控制台应用程序中单独测试语音：

public class SpeakController : ApiController
{
    //
    // api/speak

    public HttpResponseMessage Get(String textToConvert, String outputFile, string gender, string age = "Adult")
    {
        VoiceGender voiceGender = (VoiceGender)Enum.Parse(typeof(VoiceGender), gender);
        VoiceAge voiceAge = (VoiceAge)Enum.Parse(typeof(VoiceAge), age);

        //using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())
        //{
        //  synthesizer.SelectVoiceByHints(voiceGender, voiceAge);
        //  synthesizer.SetOutputToWaveFile(outputFile, new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
        //  synthesizer.Speak(textToConvert);
        //}

        return Request.CreateResponse(HttpStatusCode.OK, new Response { HttpStatusCode = (int)HttpStatusCode.OK, Message = "Payload Accepted." });
    }
}

static string usageInfo = "Invalid or no input arguments!"
    + "\n\nUsage: initiatives \"text to speak\" c:\\path\\to\\generate.wav gender"
    + "\nGender:\n\tMale or \n\tFemale"
    + "\n";

static void Main(string[] args)
{
    if (args.Length != 3)
    {
        Console.WriteLine(usageInfo);
    }
    else
    {
        ConvertStringToSpeechWav(args[0], args[1], (VoiceGender)Enum.Parse(typeof(VoiceGender), args[2]));
    }

    Console.WriteLine("Press any key to continue...");
    Console.ReadLine();
}

static void ConvertStringToSpeechWav(String textToConvert, String pathToCreateWavFile, VoiceGender gender, VoiceAge age = VoiceAge.Adult)
{
    using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())
    {
        synthesizer.SelectVoiceByHints(gender, age);
        synthesizer.SetOutputToWaveFile(pathToCreateWavFile, new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
        synthesizer.Speak(textToConvert);
    }
}

WebAPI和SpeechSynthesis似乎不能很好地结合在一起。如果您能帮我解决这个问题，我们将不胜感激

---

谢谢

我不知道为什么会发生这种情况，但在一个单独的线程中运行SpeechSynthesizer似乎可以做到这一点（线程模型不兼容？）。这是我过去的做法

基于：

---

您的pathToCreateWavFile（本地磁盘、网络、什么样的路径格式）位于什么样的位置，特别是您的IIS应用程序池是否具有写入该文件夹的权限？因为我正在我的开发机器上进行测试，所以路径是本地的。特别是'C:\temp'。是的，我认为这不是权限问题，因为WAV已成功生成。值得一提的是，VisualStudio2012附带了IISExpress。好吧，显然如果文件已完全生成，那就不是问题了-我想我会检查一下：-）通常最好将相关信息复制到您的帖子中，而不仅仅是发布链接。如果链接失效，您的信息将失效。然后你可以把它放在一个更好的环境中，以提高它的质量。谢谢你的链接！纳里曼在《更新2》中的回答完全适合我。