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Modifying an existing quickstart for consistency (#38)
* Added GetThumbnail quickstart * Updated readme * Used Path inbuilt functions to replace clunky hardcoded line * Updated Readme
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...GetThumbnail/Microsoft.Azure.CognitiveServices.Samples.ComputerVision.GetThumbnail.csproj
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFrameworks>netcoreapp2.0;net461;netstandard1.4</TargetFrameworks> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <PackageReference Include="Newtonsoft.Json" Version="12.0.2" /> | ||
| </ItemGroup> | ||
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| </Project> |
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| using System; | ||
| using System.IO; | ||
| using System.Net.Http; | ||
| using System.Net.Http.Headers; | ||
| using System.Threading.Tasks; | ||
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| namespace Microsoft.Azure.CognitiveServices.Samples.ComputerVision.GetThumbnail | ||
| { | ||
| using Newtonsoft.Json.Linq; | ||
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| class Program | ||
| { | ||
| public const string subscriptionKey = "<your training key here>"; //Insert your Cognitive Services subscription key here | ||
| public const string endpoint = "https://westus.api.cognitive.microsoft.com"; // You must use the same Azure region that you generated your subscription keys for. Free trial subscription keys are generated in the westus region. | ||
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| static void Main(string[] args) | ||
| { | ||
| GetThumbnailSample.RunAsync(endpoint, subscriptionKey).Wait(5000); | ||
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| Console.WriteLine("\nPress ENTER to exit."); | ||
| Console.ReadLine(); | ||
| } | ||
| } | ||
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| public class GetThumbnailSample | ||
| { | ||
| public static async Task RunAsync(string endpoint, string key) | ||
| { | ||
| Console.WriteLine("Get thumbnail of specific size in images:"); | ||
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| string imageFilePath = @"Images\objects.jpg"; // See this repo's readme.md for info on how to get these images. Alternatively, you can just set the path to any appropriate image on your machine. | ||
| string remoteImageUrl = "https://github.com/Azure-Samples/cognitive-services-sample-data-files/raw/master/ComputerVision/Images/celebrities.jpg"; | ||
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| await GetThumbnailFromStreamAsync(imageFilePath, endpoint, key, 50, 60, "."); | ||
| await GetThumbnailFromUrlAsync(remoteImageUrl, endpoint, key, 50, 60, "."); | ||
| } | ||
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| static async Task GetThumbnailFromStreamAsync(string imageFilePath, string endpoint, string subscriptionKey, int width, int height, string localSavePath) | ||
| { | ||
| if (!File.Exists(imageFilePath)) | ||
| { | ||
| Console.WriteLine("\nInvalid file path"); | ||
| return; | ||
| } | ||
| try | ||
| { | ||
| HttpClient client = new HttpClient(); | ||
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| // Request headers. | ||
| client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey); | ||
| string uriBase = $"{endpoint}/vision/v2.0/generateThumbnail"; | ||
| string requestParameters = $"width={width}&height={height}&smartCropping=true"; | ||
| // Assemble the URI for the REST API method. | ||
| string uri = uriBase + "?" + requestParameters; | ||
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| // Read the contents of the specified local image into a byte array. | ||
| byte[] byteData = GetImageAsByteArray(imageFilePath); | ||
| // Add the byte array as an octet stream to the request body. | ||
| using (ByteArrayContent content = new ByteArrayContent(byteData)) | ||
| { | ||
| // This example uses the "application/octet-stream" content type. | ||
| // The other content types you can use are "application/json" and "multipart/form-data". | ||
| content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream"); | ||
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| // Asynchronously call the REST API method. | ||
| HttpResponseMessage response = await client.PostAsync(uri, content); | ||
| if (response.IsSuccessStatusCode) | ||
| { | ||
| //Display the response | ||
| Console.WriteLine("\nResponse:\n{0}", response); | ||
| //Get the thumbnail image to save | ||
| byte[] thumbnailImageData = await response.Content.ReadAsByteArrayAsync(); | ||
| //Save the thumbnail image. This will overwrite existing images at the path | ||
| string imageName = Path.GetFileName(imageFilePath); | ||
| string thumbnailFilePath = Path.Combine(localSavePath, imageName.Insert(imageName.Length - 4, "_thumb")); | ||
| File.WriteAllBytes(thumbnailFilePath, thumbnailImageData); | ||
| Console.WriteLine("Saved the image to {0}\n", thumbnailFilePath); | ||
| } | ||
| else | ||
| { | ||
| // Display the JSON error data. | ||
| string errorString = await response.Content.ReadAsStringAsync(); | ||
| Console.WriteLine("\n\nResponse:\n{0}\n", JToken.Parse(errorString).ToString()); | ||
| } | ||
| } | ||
| } | ||
| catch (Exception e) | ||
| { | ||
| Console.WriteLine("\n" + e.Message); | ||
| } | ||
| } | ||
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| static byte[] GetImageAsByteArray(string imageFilePath) | ||
| { | ||
| // Open a read-only file stream for the specified file. | ||
| using (FileStream fileStream = new FileStream(imageFilePath, FileMode.Open, FileAccess.Read)) | ||
| { | ||
| // Read the file's contents into a byte array. | ||
| BinaryReader binaryReader = new BinaryReader(fileStream); | ||
| return binaryReader.ReadBytes((int)fileStream.Length); | ||
| } | ||
| } | ||
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| static async Task GetThumbnailFromUrlAsync(string imageUrl, string endpoint, string subscriptionKey, int width, int height, string localSavePath) | ||
| { | ||
| if (!Uri.IsWellFormedUriString(imageUrl, UriKind.Absolute)) | ||
| { | ||
| Console.WriteLine("\nInvalid remote image url:\n{0} \n", imageUrl); | ||
| return; | ||
| } | ||
| try | ||
| { | ||
| HttpClient client = new HttpClient(); | ||
| // Request headers. | ||
| client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey); | ||
| string uriBase = $"{endpoint}/vision/v2.0/generateThumbnail"; | ||
| string requestParameters = $"width={width}&height={height}&smartCropping=true"; | ||
| string uri = uriBase + "?" + requestParameters; | ||
| Console.WriteLine(uri); | ||
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| string requestBody = " {\"url\":\"" + imageUrl + "\"}"; | ||
| var content = new StringContent(requestBody); | ||
| content.Headers.ContentType = new MediaTypeHeaderValue("application/json"); | ||
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| // Post the request and display the result | ||
| HttpResponseMessage response = await client.PostAsync(uri, content); | ||
| if (response.IsSuccessStatusCode) | ||
| { | ||
| Console.WriteLine("\nResponse:\n{0}", response); | ||
| //Get the thumbnail image to save | ||
| byte[] thumbnailImageData = await response.Content.ReadAsByteArrayAsync(); | ||
| //Save the thumbnail image. This will overwrite existing images at the path | ||
| string imageName = Path.GetFileName(imageUrl); | ||
| string thumbnailFilePath = Path.Combine(localSavePath, imageName.Insert(imageName.Length - 4, "_thumb")); | ||
| File.WriteAllBytes(thumbnailFilePath, thumbnailImageData); | ||
| Console.WriteLine("Saved the thumbnail image from URL to {0}\n", thumbnailFilePath); | ||
| } | ||
| else | ||
| { | ||
| // Display the JSON error data. | ||
| string errorString = await response.Content.ReadAsStringAsync(); | ||
| Console.WriteLine("\n\nResponse:\n{0}\n", JToken.Parse(errorString).ToString()); | ||
| } | ||
| } | ||
| catch (Exception e) | ||
| { | ||
| Console.WriteLine("\n" + e.Message); | ||
| } | ||
| } | ||
| } | ||
| } |
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