Geiger8 その３

HPからのJsonデータの取得にちょっとハマった。

HttpWebRequestとWebResponseを使うらしい。

MSDNのサンプルをパクったけど、Taskのasyncとawaitでまたハマった。

async/awaitの場合、戻り値有のTaskでないと、ラムダの中で親の変数に値入れても反映されないようだ。ゥゥゥ・・・

Stremを取得した後は、System.Runtime.Serialization.Jsonで、オブジェクト化してくれた。

モデルはデータコントラクト使うんだな。

using System.Runtime.Serialization.Json;
using System.Runtime.Serialization;
using System.Threading.Tasks;
using System.Net;

[DataContract]
public class CPMInfo
{
    [DataMember(Name = "date")]
    public string date { get; set; }
    [DataMember(Name = "data")]
    public int data { get; set; }
}

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    var task = Task.Run<MemoryStream>(async () =>
    {
        // The downloaded resource ends up in the variable named content.
        var content = new MemoryStream();

        // Initialize an HttpWebRequest for the current URL.
        var webReq = (HttpWebRequest)WebRequest.Create(@"http://xxxxx.net/jsonget.php");

        // Send the request to the Internet resource and wait for
        // the response.
        using (WebResponse response = await webReq.GetResponseAsync())
        {
            // Get the data stream that is associated with the specified URL.
            using (Stream responseStream = response.GetResponseStream())
            {
                // Read the bytes in responseStream and copy them to content.  
                responseStream.CopyTo(content);
            }
        }

        // Return the result as a byte array.
        return content;
    });
    task.Wait();

    MemoryStream urlContents = task.Result;
    if (urlContents == null)
        return;

    Debug.WriteLine(Encoding.UTF8.GetString(urlContents.ToArray(), 0, (int)urlContents.Length));

    urlContents.Seek(0, SeekOrigin.Begin);
    var s = new DataContractJsonSerializer(typeof(List<CPMInfo>));
    var jo = s.ReadObject(urlContents) as List<CPMInfo>;

using System.Runtime.Serialization.Json;

using System.Runtime.Serialization;

using System.Threading.Tasks;

using System.Net;

[DataContract]

public class CPMInfo

{

[DataMember(Name = "date")]

public string date { get; set; }

[DataMember(Name = "data")]

public int data { get; set; }

}

protected override void OnNavigatedTo(NavigationEventArgs e)

{

var task = Task.Run<MemoryStream>(async () =>

{

// The downloaded resource ends up in the variable named content.

var content = new MemoryStream();

// Initialize an HttpWebRequest for the current URL.

var webReq = (HttpWebRequest)WebRequest.Create(@"http://xxxxx.net/jsonget.php");

// Send the request to the Internet resource and wait for

// the response.

using (WebResponse response = await webReq.GetResponseAsync())

{

// Get the data stream that is associated with the specified URL.

using (Stream responseStream = response.GetResponseStream())

{

// Read the bytes in responseStream and copy them to content.

responseStream.CopyTo(content);

}

// Return the result as a byte array.

return content;

});

task.Wait();

MemoryStream urlContents = task.Result;

if (urlContents == null)

return;

Debug.WriteLine(Encoding.UTF8.GetString(urlContents.ToArray(), 0, (int)urlContents.Length));

urlContents.Seek(0, SeekOrigin.Begin);

var s = new DataContractJsonSerializer(typeof(List<CPMInfo>));

var jo = s.ReadObject(urlContents) as List<CPMInfo>;

一応、Listになったけど、全取得だからやっぱり遅いな。。。

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Geiger8 その３

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