翻訳系API「Translator API」の使い方と2017年2月現在のWatson、Google翻訳との違い：認識系API活用入門（2）（2/3 ページ）

<Window x:Class="TranslatorTextAPI.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TranslatorTextAPI"
        mc:Ignorable="d"
        Title="Translator Text API" Height="500" Width="950">
    <Grid>
        <StackPanel HorizontalAlignment="Center" Margin="10,10,10,10">
            <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                <StackPanel>
                    <TextBlock Text="FROM" FontSize="30" />
                    <ComboBox Name="cmbLanguageFrom" Width="400" Height="30" />
                    <TextBox Name="tboxTranslationFrom" Width="400" Height="200" TextWrapping="Wrap" />
                </StackPanel>
                <Label Content=">>" Width="80" FontSize="40" VerticalAlignment="Center" HorizontalContentAlignment="Center"/>
                <StackPanel>
                    <TextBlock Text="TO" FontSize="30" />
                    <ComboBox Name="cmbLanguageTo"  Width="400" Height="30" />
                    <TextBox Name="tboxTranslationTo" Width="400" Height="200" TextWrapping="Wrap" />
                </StackPanel>
            </StackPanel>
            <Button Name="btnTranslate" Content="翻　　訳" Width="300" Height="50" Click="btnTranslate_Click" Margin="0,20,0,0" />
            <TextBlock Name="tblkMessage" Width="800" Height="70" TextWrapping="Wrap" ScrollViewer.CanContentScroll="True" Margin="0,20,0,0" />
        </StackPanel>
    </Grid>
</Window>

string GetAccessTokenForTranslation()
{
    try
    {
        //取得したTranslator Text API の Key を入れてください
        string subscriptionKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
 
                WebRequest request = WebRequest.Create("https://api.cognitive.microsoft.com/sts/v1.0/issueToken");
 
        //リクエスト設定
        request.Method = "POST"; // メソッドはPOST
        request.Headers.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
        request.ContentLength = 0;
 
        // リクエストを投げる
        WebResponse response = request.GetResponse();
        Stream responseStream = response.GetResponseStream();
 
        //　レスポンスを受け取る
        StreamReader streamReader = new StreamReader(responseStream);
 
        //　Tokenを取得した時間を取得
        tokenRefreshedTime = DateTime.Now;
 
        // レスポンス（Token）を返す
        return streamReader.ReadToEnd();
    }
    catch(WebException webException)
    {
        Stream responseStream = webException.Response.GetResponseStream();
        StreamReader streamReader = new StreamReader(responseStream);
        tblkMessage.Text = streamReader.ReadToEnd();
        return null;
    }
    catch (Exception exception)
    {
        tblkMessage.Text = exception.Message;
        return null;
    }
}

string[] GetLanguagesForTranslate(string token)
{
    try
    {
        string requestURL = "http://api.microsofttranslator.com/v2/Http.svc/GetLanguagesForTranslate";
        // リクエスト設定
        WebRequest request = WebRequest.Create(requestURL);
        request.Method = "GET"; // メソッドはGET
        request.Headers.Add("Authorization", "Bearer " + token);
 
        // レスポンスを受け取る
        WebResponse webResponse = request.GetResponse();
        Stream responseStream = webResponse.GetResponseStream();
 
        // レスポンスのXMLを変換
        DataContractSerializer dcs = new DataContractSerializer(typeof(string[]));
                return (string[])dcs.ReadObject(responseStream);
 
    }
    catch (WebException webException)
    {
        Stream responseStream = webException.Response.GetResponseStream();
        StreamReader streamReader = new StreamReader(responseStream);
        tblkMessage.Text = streamReader.ReadToEnd();
 
        return null;
    }
    catch (Exception exception)
    {
        tblkMessage.Text = exception.Message;
        return null;
    }
}

string[] GetLanguageNames(string token, string[] languageCodeArray)
{
    try
    {
        string requestURL = "http://api.microsofttranslator.com/v2/Http.svc/GetLanguageNames?locale=ja";
 
        // リクエスト設定
        WebRequest request = WebRequest.Create(requestURL);
        request.Method = "POST"; // メソッドはPOST
        request.ContentType = "text/xml";
        request.Headers.Add("Authorization", "Bearer " + token);
        // 言語コードの配列をXML化してリクエストのストリームに書き込み
        DataContractSerializer dcs = new DataContractSerializer(typeof(string[]));
        Stream stream = request.GetRequestStream();
        dcs.WriteObject(stream, languageCodeArray);
 
        // レスポンスを受け取る
        WebResponse webResponse = request.GetResponse();
        Stream responseStream = webResponse.GetResponseStream();
 
        // レスポンスの言語名称のXMLを変換
        dcs = new DataContractSerializer(typeof(string[]));
        string[] languageNamesArray = (string[])dcs.ReadObject(responseStream);
        return languageNamesArray;
 
    }
    catch (WebException webException)
    {
        Stream responseStream = webException.Response.GetResponseStream();
        StreamReader streamReader = new StreamReader(responseStream);
        tblkMessage.Text = streamReader.ReadToEnd();
 
        return null;
    }
    catch (Exception exception)
    {
        tblkMessage.Text = exception.Message;
        return null;
    }
}

string GetTranslatorResult(string token)
{
    try
    { 
        // 翻訳するテキスト
        string text = HttpUtility.UrlEncode(tboxTranslationFrom.Text);
        // 翻訳の言語
        string fromLanguage = ((ComboBoxItem)cmbLanguageFrom.SelectedItem).Tag.ToString();
        string toLanguage = ((ComboBoxItem)cmbLanguageTo.SelectedItem).Tag.ToString();
 
        string requestURL = "http://api.microsofttranslator.com/v2/Http.svc/Translate";
        requestURL += "?text=" + text + "&from=" + fromLanguage + "&to=" + toLanguage;
        requestURL += "&category=generalnn";
        // リクエスト設定
        WebRequest request = WebRequest.Create(requestURL);
        request.Method = "GET"; // メソッドはGET
        request.Headers["Authorization"] = "Bearer " + token;
 
        // レスポンスを受け取る
        WebResponse webResponse = request.GetResponse();
        Stream responseStream = webResponse.GetResponseStream();
 
        // レスポンスのXMLを変換
        DataContractSerializer dcs = new DataContractSerializer(typeof(string));
        return (string)dcs.ReadObject(responseStream);
 
    }
    catch (WebException webException)
    {
        Stream responseStream = webException.Response.GetResponseStream();
        StreamReader streamReader = new StreamReader(responseStream);
        tblkMessage.Text = streamReader.ReadToEnd();
        return null;
    }
    catch (Exception exception)
    {
        MessageBox.Show(exception.Message);
        return null;
    }
}