using System; using System.IO; using System.Net.Http; using System.Net.Http.Headers; using System.Text;
namespace CSHttpClientSample { static class Program { // ********************************************** // *** Update or verify the following values. *** // **********************************************
// Replace the subscriptionKey string value with your valid subscription key.
const string subscriptionKey = "00df3ea910594a5b8a33ce743a09da0d";
// Replace or verify the region.
//
// You must use the same region in your REST API call as you used to obtain your subscription keys.
// For example, if you obtained your subscription keys from the westus region, replace
// "westcentralus" in the URI below with "westus".
//
// NOTE: Free trial subscription keys are generated in the westcentralus region, so if you are using
// a free trial subscription key, you should not need to change this region.
const string uriBase = "https://westcentralus.api.cognitive.microsoft.com/face/v1.0/detect";
static void Main()
{
// Get the path and filename to process from the user.
Console.WriteLine("Detect faces:");
Console.Write("Enter the path to an image with faces that you wish to analyze: ");
string imageFilePath = Console.ReadLine();
// Execute the REST API call.
MakeAnalysisRequest(imageFilePath);
Console.WriteLine("\nPlease wait a moment for the results to appear. Then, press Enter to exit...\n");
Console.ReadLine();
}
/// <summary>
/// Gets the analysis of the specified image file by using the Computer Vision REST API.
/// </summary>
/// <param name="imageFilePath">The image file.</param>
static async void MakeAnalysisRequest(string imageFilePath)
{
HttpClient client = new HttpClient();
// Request headers.
client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
// Request parameters. A third optional parameter is "details".
string requestParameters = "https://westcentralus.api.cognitive.microsoft.com/face/v1.0/detect?returnFaceId=true&returnFaceLandmarks=false&returnFaceAttributes=age,gender,headPose,smile,facialHair,glasses,emotion,hair,makeup,occlusion,accessories,blur,exposure,noise";
// Assemble the URI for the REST API Call.
string uri = uriBase + "?" + requestParameters;
HttpResponseMessage response;
// Request body. Posts a locally stored JPEG image.
byte[] byteData = GetImageAsByteArray(imageFilePath);
using (ByteArrayContent content = new ByteArrayContent(byteData))
{
// This example uses content type "application/octet-stream".
// The other content types you can use are "application/json" and "multipart/form-data".
content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
// Execute the REST API call.
response = await client.PostAsync(uri, content);
// Get the JSON response.
string contentString = await response.Content.ReadAsStringAsync();
// Display the JSON response.
Console.WriteLine("\nResponse:\n");
Console.WriteLine(JsonPrettyPrint(contentString));
}
}
/// <summary>
/// Returns the contents of the specified file as a byte array.
/// </summary>
/// <param name="imageFilePath">The image file to read.</param>
/// <returns>The byte array of the image data.</returns>
static byte[] GetImageAsByteArray(string imageFilePath)
{
FileStream fileStream = new FileStream(imageFilePath, FileMode.Open, FileAccess.Read);
BinaryReader binaryReader = new BinaryReader(fileStream);
return binaryReader.ReadBytes((int)fileStream.Length);
}
/// <summary>
/// Formats the given JSON string by adding line breaks and indents.
/// </summary>
/// <param name="json">The raw JSON string to format.</param>
/// <returns>The formatted JSON string.</returns>
static string JsonPrettyPrint(string json)
{
if (string.IsNullOrEmpty(json))
return string.Empty;
json = json.Replace(Environment.NewLine, "").Replace("\t", "");
StringBuilder sb = new StringBuilder();
bool quote = false;
bool ignore = false;
int offset = 0;
int indentLength = 3;
foreach (char ch in json)
{
switch (ch)
{
case '"':
if (!ignore) quote = !quote;
break;
case '\'':
if (quote) ignore = !ignore;
break;
}
if (quote)
sb.Append(ch);
else
{
switch (ch)
{
case '{':
case '[':
sb.Append(ch);
sb.Append(Environment.NewLine);
sb.Append(new string(' ', ++offset * indentLength));
break;
case '}':
case ']':
sb.Append(Environment.NewLine);
sb.Append(new string(' ', --offset * indentLength));
sb.Append(ch);
break;
case ',':
sb.Append(ch);
sb.Append(Environment.NewLine);
sb.Append(new string(' ', offset * indentLength));
break;
case ':':
sb.Append(ch);
sb.Append(' ');
break;
default:
if (ch != ' ') sb.Append(ch);
break;
}
}
}
return sb.ToString().Trim();
}
}
}