public FaceChannel StartFaceChannel(
string strUrl,
out string strError)
{
strError = "";
FaceChannel result = new FaceChannel();
result.Channel = new IpcClientChannel(Guid.NewGuid().ToString(), // 随机的名字，令多个 Channel 对象可以并存
new BinaryClientFormatterSinkProvider());
ChannelServices.RegisterChannel(result.Channel, true);
bool bDone = false;
try
{
result.Object = (IBioRecognition)Activator.GetObject(typeof(IBioRecognition),
strUrl);
if (result.Object == null)
{
strError = "无法连接到服务器 " + strUrl;
return(null);
}
bDone = true;
return(result);
}
finally
{
if (bDone == false)
{
EndFaceChannel(result);
}
}
}
public void EndFaceChannel(FaceChannel channel)
{
if (channel != null && channel.Channel != null)
{
ChannelServices.UnregisterChannel(channel.Channel);
channel.Channel = null;
}
}
public async Task <NormalResult> FaceGetState(string strStyle)
{
if (string.IsNullOrEmpty(Program.MainForm.FaceReaderUrl) == true)
{
return(new NormalResult
{
Value = -1,
ErrorInfo = "尚未配置 人脸识别接口URL 系统参数，无法读取人脸信息"
});
}
FaceChannel channel = StartFaceChannel(
Program.MainForm.FaceReaderUrl,
out string strError);
if (channel == null)
{
return new NormalResult
{
Value = -1,
ErrorInfo = strError
}
}
;
try
{
return(await Task.Factory.StartNew <NormalResult>(
() =>
{
return channel.Object.GetState(strStyle);
}));
}
catch (Exception ex)
{
strError = "针对 " + Program.MainForm.FaceReaderUrl + " 的 GetState() 操作失败: " + ex.Message;
return(new NormalResult
{
Value = -1,
ErrorInfo = strError
});
}
finally
{
EndFaceChannel(channel);
}
}
// 人脸识别 API
RecognitionFaceResult Recognition(string url, string style)
{
FaceChannel channel = StartFaceChannel(
url,
out string strError);
if (channel == null)
{
return new RecognitionFaceResult
{
Value = -1,
ErrorInfo = strError
}
}
;
try
{
return(channel.Object.RecognitionFace(style));
}
catch (Exception ex)
{
strError = $"针对 {url} 的 RecongitionFace() 操作失败: { ex.Message}";
return(new RecognitionFaceResult
{
Value = -1,
ErrorInfo = strError
});
}
finally
{
EndFaceChannel(channel);
}
}
// 取消人脸识别任务 API
NormalResult CancelRecognition(string url)
{
FaceChannel channel = StartFaceChannel(
url,
out string strError);
if (channel == null)
{
return new NormalResult
{
Value = -1,
ErrorInfo = strError
}
}
;
try
{
return(channel.Object.CancelRecognitionFace());
}
catch (Exception ex)
{
strError = $"针对 {url} 的 CancelRecognitionFace() 操作失败: { ex.Message}";
return(new RecognitionFaceResult
{
Value = -1,
ErrorInfo = strError
});
}
finally
{
EndFaceChannel(channel);
}
}
NormalResult DisplayVideo(string url, CancellationToken token)
{
FaceChannel channel = StartFaceChannel(
url,
out string strError);
if (channel == null)
{
return new NormalResult
{
Value = -1,
ErrorInfo = strError
}
}
;
try
{
while (token.IsCancellationRequested == false)
{
var result = channel.Object.GetImage("");
if (result.Value == -1)
{
return(result);
}
using (MemoryStream stream = new MemoryStream(result.ImageData))
{
this.pictureBox1.Image = Image.FromStream(stream);
}
}
return(new NormalResult());
}
catch (Exception ex)
{
strError = $"针对 {url} 的 GetImage() 请求失败: { ex.Message}";
return(new RecognitionFaceResult
{
Value = -1,
ErrorInfo = strError
});
}
finally
{
EndFaceChannel(channel);
}
}
#region 人脸识别有关功能
public class FaceChannel
