以下是我的脚本请求Google Speech API。
public string HttpUploadFile(string url, string file, string paramName, string contentType) {
file = @"C:\Users\Faizan Khan\AppData\LocalLow\DefaultCompany\GoogleSpeechTest\testing\testing7.060799.wav";
Debug.Log(string.Format("Uploading {0} to {1}", file, url));
HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
wr.ContentType = "audio/l16; rate=44100";
wr.Method = "POST";
wr.KeepAlive = true;
wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
Stream rs = wr.GetRequestStream();
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[4096];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) {
rs.Write(buffer, 0, bytesRead);
}
fileStream.Close();
rs.Close();
WebResponse wresp = null;
try {
wresp = wr.GetResponse();
Stream stream2 = wresp.GetResponseStream();
StreamReader reader2 = new StreamReader(stream2);
string responseString = string.Format("{0}", reader2.ReadToEnd());
Debug.Log("HTTP RESPONSE" +responseString);
return responseString;
} catch(Exception ex) {
Debug.Log(string.Format("Error uploading file error: {0}", ex));
if(wresp != null) {
wresp.Close();
wresp = null;
return "Error";
}
} finally {
wr = null;
}
return "empty";
}
我在这里收到错误
Stream rs = wr.GetRequestStream();
在调用 HttpUploadFile 函数时。我搜索了不同的论坛，但没有任何对我有用。为什么我收到这个错误？
错误是：
WebException: Error: NameResolutionFailure
System.Net.HttpWebRequest.EndGetRequestStream (IAsyncResult asyncResult)
System.Net.HttpWebRequest.GetRequestStream ()
GoogleVoiceSpeech.HttpUploadFile (System.String url, System.String file, System.String paramName, System.String contentType) (at Assets/Scripts/GoogleVoiceSpeech.cs:173)
GoogleVoiceSpeech.OnGUI () (at Assets/Scripts/GoogleVoiceSpeech.cs:131)
这是完整的课程
public class GoogleVoiceSpeech : MonoBehaviour {
public GUIText TextBox;
struct ClipData
{
public int samples;
}
const int HEADER_SIZE = 44;
private int minFreq;
private int maxFreq;
private bool micConnected = false;
//A handle to the attached AudioSource
private AudioSource goAudioSource;
public string apiKey;
// Use this for initialization
void Start () {
//Check if there is at least one microphone connected
if(Microphone.devices.Length <= 0)
{
//Throw a warning message at the console if there isn't
Debug.LogWarning("Microphone not connected!");
}
else //At least one microphone is present
{
//Set 'micConnected' to true
micConnected = true;
//Get the default microphone recording capabilities
Microphone.GetDeviceCaps(null, out minFreq, out maxFreq);
//According to the documentation, if minFreq and maxFreq are zero, the microphone supports any frequency...
if(minFreq == 0 && maxFreq == 0)
{
//...meaning 44100 Hz can be used as the recording sampling rate
maxFreq = 44100;
}
//Get the attached AudioSource component
goAudioSource = this.GetComponent<AudioSource>();
}
}
void OnGUI()
{
//If there is a microphone
if(micConnected)
{
//If the audio from any microphone isn't being recorded
if(!Microphone.IsRecording(null))
{
//Case the 'Record' button gets pressed
if(GUI.Button(new Rect(Screen.width/2-100, Screen.height/2-25, 200, 50), "Record"))
{
//Start recording and store the audio captured from the microphone at the AudioClip in the AudioSource
goAudioSource.clip = Microphone.Start( null, true, 7, maxFreq); //Currently set for a 7 second clip
}
}
else //Recording is in progress
{
//Case the 'Stop and Play' button gets pressed
if(GUI.Button(new Rect(Screen.width/2-100, Screen.height/2-25, 200, 50), "Stop and Play!"))
{
float filenameRand = UnityEngine.Random.Range (0.0f, 10.0f);
string filename = "testing" + filenameRand;
Microphone.End(null); //Stop the audio recording
Debug.Log( "Recording Stopped");
if (!filename.ToLower().EndsWith(".wav")) {
filename += ".wav";
}
var filePath = Path.Combine("testing/", filename);
filePath = Path.Combine(Application.persistentDataPath, filePath);
Debug.Log("Created filepath string: " + filePath);
// Make sure directory exists if user is saving to sub dir.
Directory.CreateDirectory(Path.GetDirectoryName(filePath));
SavWav.Save (filePath, goAudioSource.clip); //Save a temporary Wav File
Debug.Log( "Saving @ " + filePath);
string apiURL = "http://www.google.com/speech-api/v2/recognize?output=json&lang=en-us&key=" + apiKey;
//string apiURL = "https://speech.googleapis.com/v1/speech:recognize?key=" + apiKey;
string Response;
Debug.Log( "Uploading " + filePath);
Response = HttpUploadFile (apiURL, filePath, "file", "audio/wav; rate=44100");
Debug.Log ("Response String: " +Response);
var jsonresponse = SimpleJSON.JSON.Parse(Response);
if (jsonresponse != null) {
string resultString = jsonresponse ["result"] [0].ToString ();
var jsonResults = SimpleJSON.JSON.Parse (resultString);
string transcripts = jsonResults ["alternative"] [0] ["transcript"].ToString ();
Debug.Log ("transcript string: " + transcripts );
TextBox.text = transcripts;
}
//goAudioSource.Play(); //Playback the recorded audio
File.Delete(filePath); //Delete the Temporary Wav file
}
GUI.Label(new Rect(Screen.width/2-100, Screen.height/2+25, 200, 50), "Recording in progress...");
}
}
else // No microphone
{
//Print a red "Microphone not connected!" message at the center of the screen
GUI.contentColor = Color.red;
GUI.Label(new Rect(Screen.width/2-100, Screen.height/2-25, 200, 50), "Microphone not connected!");
}
}
public string HttpUploadFile(string url, string file, string paramName, string contentType) {
file = @"C:\Users\Faizan Khan\AppData\LocalLow\DefaultCompany\GoogleSpeechTest\testing\testing7.060799.wav";
Debug.Log(string.Format("Uploading {0} to {1}", file, url));
HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
wr.ContentType = "audio/l16; rate=44100";
wr.Method = "POST";
wr.KeepAlive = true;
wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
Stream rs = wr.GetRequestStream();
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[4096];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) {
rs.Write(buffer, 0, bytesRead);
}
fileStream.Close();
rs.Close();
WebResponse wresp = null;
try {
wresp = wr.GetResponse();
Stream stream2 = wresp.GetResponseStream();
StreamReader reader2 = new StreamReader(stream2);
string responseString = string.Format("{0}", reader2.ReadToEnd());
Debug.Log("HTTP RESPONSE" +responseString);
return responseString;
} catch(Exception ex) {
Debug.Log(string.Format("Error uploading file error: {0}", ex));
if(wresp != null) {
wresp.Close();
wresp = null;
return "Error";
}
} finally {
wr = null;
}
return "empty";
}