public async Task <Response <FaceDetectResult> > DetectAsync(CancellationToken cancellation, string imagePath, FaceDetectOptions options)
{
if (options == null)
{
options = new FaceDetectOptions();
}
Uri uri = BuildUri(options);
HttpMessage message = null;
try
{
message = _client.CreateMessage(_options, cancellation);
message.SetRequestLine(PipelineMethod.Post, uri);
message.AddHeader(_keyHeader);
message.AddHeader(HttpHeader.Common.OctetStreamContentType);
SetContentStream(message, imagePath);
await _client.ProcessAsync(message).ConfigureAwait(false);
Response response = message.Response;
if (!response.TryGetHeader(s_contentLength, out long contentLength))
{
throw new Exception("bad response: no content length header");
}
var buffer = new byte[contentLength];
var read = await response.ContentStream.ReadAsync(buffer, cancellation);
Func <Response, FaceDetectResult> contentParser = null;
if (response.Status == 200)
{
contentParser = (rsp) => { return(FaceDetectResult.Parse(new ReadOnlySequence <byte>(buffer, 0, read))); };
}
return(new Response <FaceDetectResult>(response, contentParser));
}
catch
{
if (message != null)
{
message.Dispose();
}
throw;
}
}
public async Task <Response <FaceDetectResult> > DetectAsync(CancellationToken cancellation, Uri image, FaceDetectOptions options)
{
if (options == null)
{
options = new FaceDetectOptions();
}
Uri uri = BuildUri(options);
PipelineCallContext context = null;
try
{
context = _client.CreateContext(_options, cancellation);
context.SetRequestLine(ServiceMethod.Post, uri);
context.AddHeader(_keyHeader);
context.AddHeader(Header.Common.JsonContentType);
context.SetContent(new FaceContent(image, context));
await _client.ProcessAsync(context).ConfigureAwait(false);
ServiceResponse response = context.Response;
if (!response.TryGetHeader(s_contentLength, out long contentLength))
{
throw new Exception("bad response: no content length header");
}
var buffer = new byte[contentLength];
var read = await response.ContentStream.ReadAsync(buffer, cancellation);
Func <ServiceResponse, FaceDetectResult> contentParser = null;
if (response.Status == 200)
{
contentParser = (rsp) => { return(FaceDetectResult.Parse(new ReadOnlySequence <byte>(buffer, 0, read))); };
}
return(new Response <FaceDetectResult>(response, contentParser));
}
catch
{
if (context != null)
{
context.Dispose();
}
throw;
}
}
static void SetValue(ref Utf8JsonReader json, JsonState state, ref FaceDetectResult result)
{
switch (state)
{
// floats
case JsonState.age: result.Age = json.GetValueAsSingle(); break;
case JsonState.smile: result.Smile = json.GetValueAsSingle(); break;
// strings
case JsonState.gender: result.Gender = json.GetValueAsString(); break;
case JsonState.faceId: result.FaceId = json.GetValueAsString(); break;
default: break;
}
}
public static FaceDetectResult Parse(ReadOnlySequence <byte> content)
{
var result = new FaceDetectResult();
var json = new Utf8JsonReader(content, true);
JsonState state = JsonState.Other;
while (json.Read())
{
switch (json.TokenType)
{
case JsonTokenType.PropertyName:
state = json.Value.ToJsonState();
break;
case JsonTokenType.Number:
case JsonTokenType.String:
SetValue(ref json, state, ref result);
break;
}
}
return(result);
}
