WebRequest.BeginGetResponse メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

WebRequest.BeginGetResponse メソッド

派生クラスでオーバーライドされると、インターネットリソースの非同期要求を開始します。

名前空間: System.Net
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public Overridable Function
 BeginGetResponse ( _
    callback As AsyncCallback, _
    state As Object _
) As IAsyncResult

Visual Basic (使用法)

Dim instance As WebRequest
Dim callback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult

returnValue = instance.BeginGetResponse(callback, state)

public virtual IAsyncResult BeginGetResponse (
    AsyncCallback callback,
    Object state
)

C++

public:
virtual IAsyncResult^ BeginGetResponse (
    AsyncCallback^ callback, 
    Object^ state
)

public IAsyncResult BeginGetResponse (
    AsyncCallback callback, 
    Object state
)

JScript

public function BeginGetResponse (
    callback : AsyncCallback, 
    state : Object
) : IAsyncResult

パラメータ

callback: AsyncCallback デリゲート。

state: 非同期要求の状態情報を格納するオブジェクト。

戻り値
非同期の要求を参照する IAsyncResult。

例外

例外の種類	条件
NotImplementedException	メソッドが派生クラスでオーバーライドされていないのに、そのメソッドへのアクセスが試行されました。

解説

BeginGetResponse メソッドは、応答の非同期要求を開始します。AsyncCallback デリゲートを実装するコールバックメソッドは、EndGetResponse メソッドを使用してインターネットリソースから WebResponse を返します。

メモ
WebRequest クラスは、abstract クラスです。実行時の WebRequest インスタンスの実際の動作は、System.Net.WebRequest.Create メソッドで返される派生クラスによって決まります。既定値および例外の詳細については、HttpWebRequest や FileWebRequest などの派生クラスの説明を参照してください。

メモ
WebException がスローされた場合は、例外の Response プロパティと Status プロパティを使用してサーバーからの応答を確認します。

使用例

BeginGetResponse を使用して、ターゲットリソースを非同期的に要求する例を次に示します。リソースが取得されている場合は、指定したコールバックメソッドが実行されます。

Visual Basic

Imports System
Imports System.Net
Imports System.IO
Imports System.Text
Imports System.Threading
Imports Microsoft.VisualBasic



Public Class RequestState
  ' This class stores the state of the request
  Private Shared BUFFER_SIZE As
 Integer = 1024
  Public requestData As StringBuilder
  Public bufferRead() As Byte
  Public request As WebRequest
  Public response As WebResponse
  Public responseStream As Stream
  
  Public Sub New()
    bufferRead = New Byte(BUFFER_SIZE) {}
    requestData = New StringBuilder("")
    request = Nothing
    responseStream = Nothing
  End Sub ' New
End Class ' RequestState

Class WebRequest_BeginGetResponse
  Public Shared allDone As
 New ManualResetEvent(False)
  Private Shared BUFFER_SIZE As
 Integer = 1024
  
  Shared Sub Main()
    Try


      ' Create a new webrequest to the mentioned URL.
      Dim myWebRequest As WebRequest = WebRequest.Create("http://www.contoso.com")
      'Please, set the proxy to a correct value.
      Dim proxy As New WebProxy("itgproxy:80")
      proxy.Credentials = New NetworkCredential("srikun",
 "simrin123")
      myWebRequest.Proxy = proxy
      ' Create a new instance of the RequestState.
      Dim myRequestState As New
 RequestState()
      ' The 'WebRequest' object is associated to the 'RequestState'
 object.
      myRequestState.request = myWebRequest
      ' Start the Asynchronous call for response.
      Dim asyncResult As IAsyncResult = CType(myWebRequest.BeginGetResponse(AddressOf
 RespCallback, myRequestState), IAsyncResult)
      allDone.WaitOne()
      ' Release the WebResponse resource.
      myRequestState.response.Close()
      Console.Read()
    Catch e As WebException
      Console.WriteLine("WebException raised!")
      Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
      Console.WriteLine(ControlChars.Cr + "{0}", e.Status)
    Catch e As Exception
      Console.WriteLine("Exception raised!")
      Console.WriteLine(("Source : " + e.Source))
      Console.WriteLine(("Message : " + e.Message))
    End Try
  End Sub ' Main

  Private Shared Sub RespCallback(asynchronousResult
 As IAsyncResult)
    Try
      ' Set the State of request to asynchronous.
      Dim myRequestState As RequestState =
 CType(asynchronousResult.AsyncState, RequestState)
      Dim myWebRequest1 As WebRequest = myRequestState.request
      ' End the Asynchronous response.
      myRequestState.response = myWebRequest1.EndGetResponse(asynchronousResult)
      ' Read the response into a 'Stream' object.
      Dim responseStream As Stream = myRequestState.response.GetResponseStream()
      myRequestState.responseStream = responseStream
      ' Begin the reading of the contents of the HTML page and print
 it to the console.
      Dim asynchronousResultRead As IAsyncResult
 = responseStream.BeginRead(myRequestState.bufferRead, 0, BUFFER_SIZE, AddressOf
 ReadCallBack, myRequestState)
    Catch e As WebException
      Console.WriteLine("WebException raised!")
      Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
      Console.WriteLine(ControlChars.Cr + "{0}", e.Status)
    Catch e As Exception
      Console.WriteLine("Exception raised!")
      Console.WriteLine(("Source : " + e.Source))
      Console.WriteLine(("Message : " + e.Message))
    End Try
  End Sub ' RespCallback
  Private Shared Sub ReadCallBack(asyncResult
 As IAsyncResult)
    Try
      ' Result state is set to AsyncState.
      Dim myRequestState As RequestState =
 CType(asyncResult.AsyncState, RequestState)
      Dim responseStream As Stream = myRequestState.responseStream
      Dim read As Integer
 = responseStream.EndRead(asyncResult)
      ' Read the contents of the HTML page and then print to the console.
      If read > 0 Then
        myRequestState.requestData.Append(Encoding.ASCII.GetString(myRequestState.bufferRead,
 0, read))
        Dim asynchronousResult As IAsyncResult
 = responseStream.BeginRead(myRequestState.bufferRead, 0, BUFFER_SIZE, AddressOf
 ReadCallBack, myRequestState)
      Else
        Console.WriteLine(ControlChars.Cr + "The HTML page Contents
 are:  ")
        If myRequestState.requestData.Length > 1 Then
          Dim sringContent As String
          sringContent = myRequestState.requestData.ToString()
          Console.WriteLine(sringContent)
        End If
        Console.WriteLine(ControlChars.Cr + "Press 'Enter' key
 to continue........")
        responseStream.Close()
           allDone.Set()
      End If
    Catch e As WebException
      Console.WriteLine("WebException raised!")
      Console.WriteLine(ControlChars.Cr + "{0}", e.Message)
      Console.WriteLine(ControlChars.Cr + "{0}", e.Status)
    Catch e As Exception
      Console.WriteLine("Exception raised!")
      Console.WriteLine("Source :{0} ", e.Source)
      Console.WriteLine("Message :{0} ", e.Message)
    End Try
  End Sub ' ReadCallBack 

End Class ' WebRequest_BeginGetResponse

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Threading;



public class RequestState
{
  // This class stores the state of the request.
  const int BUFFER_SIZE = 1024;
  public StringBuilder requestData;
  public byte[] bufferRead;
  public WebRequest request;
  public WebResponse response;
  public Stream responseStream;
  public RequestState()
  {
    bufferRead = new byte[BUFFER_SIZE];
    requestData = new StringBuilder("");
    request = null;
    responseStream = null;
  }
}
class WebRequest_BeginGetResponse
{
  public static ManualResetEvent allDone= new
 ManualResetEvent(false);
  const int BUFFER_SIZE = 1024;
  static void Main()
  {
    try
    {
      // Create a new webrequest to the mentioned URL.   
      WebRequest myWebRequest= WebRequest.Create("http://www.contoso.com");
      
      // Please, set the proxy to a correct value. 
      WebProxy proxy=new WebProxy("myproxy:80");

      proxy.Credentials=new NetworkCredential("srikun"
,"simrin123");
      myWebRequest.Proxy=proxy;
      // Create a new instance of the RequestState.
      RequestState myRequestState = new RequestState();
      // The 'WebRequest' object is associated to the 'RequestState'
 object.
      myRequestState.request = myWebRequest;
      // Start the Asynchronous call for response.
      IAsyncResult asyncResult=(IAsyncResult) myWebRequest.BeginGetResponse(new
 AsyncCallback(RespCallback),myRequestState);
      allDone.WaitOne();
      // Release the WebResponse resource.
      myRequestState.response.Close();
      Console.Read();
    }
    catch(WebException e)
    {
      Console.WriteLine("WebException raised!");
      Console.WriteLine("\n{0}",e.Message);
      Console.WriteLine("\n{0}",e.Status);
    } 
    catch(Exception e)
    {
      Console.WriteLine("Exception raised!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
  }
  private static void RespCallback(IAsyncResult
 asynchronousResult)
  {  
    try
    {
      // Set the State of request to asynchronous.
      RequestState myRequestState=(RequestState) asynchronousResult.AsyncState;
      WebRequest  myWebRequest1=myRequestState.request;
      // End the Asynchronous response.
      myRequestState.response =  myWebRequest1.EndGetResponse(asynchronousResult);
      // Read the response into a 'Stream' object.
      Stream responseStream = myRequestState.response.GetResponseStream();
      myRequestState.responseStream=responseStream;
      // Begin the reading of the contents of the HTML page and print
 it to the console.
      IAsyncResult asynchronousResultRead = responseStream.BeginRead(myRequestState.bufferRead,
 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), myRequestState);
    
    }
    catch(WebException e)
    {
      Console.WriteLine("WebException raised!");
      Console.WriteLine("\n{0}",e.Message);
      Console.WriteLine("\n{0}",e.Status);
    } 
    catch(Exception e)
    {
      Console.WriteLine("Exception raised!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
  }
  private static  void ReadCallBack(IAsyncResult
 asyncResult)
  {
    try
    {
      // Result state is set to AsyncState.
      RequestState myRequestState = (RequestState)asyncResult.AsyncState;
      Stream responseStream = myRequestState.responseStream;
      int read = responseStream.EndRead( asyncResult );
      // Read the contents of the HTML page and then print to the console.
      if (read > 0)
      {
        myRequestState.requestData.Append(Encoding.ASCII.GetString(myRequestState.bufferRead,
 0, read));
        IAsyncResult asynchronousResult = responseStream.BeginRead( myRequestState.bufferRead,
 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), myRequestState);
      }
      else
      {
        Console.WriteLine("\nThe HTML page Contents are:  ");
        if(myRequestState.requestData.Length>1)
        {
          string sringContent;
          sringContent = myRequestState.requestData.ToString();
          Console.WriteLine(sringContent);
        }
        Console.WriteLine("\nPress 'Enter' key to continue........");
        responseStream.Close();
        allDone.Set();
      }
    }
    catch(WebException e)
    {
      Console.WriteLine("WebException raised!");
      Console.WriteLine("\n{0}",e.Message);
      Console.WriteLine("\n{0}",e.Status);
    } 
    catch(Exception e)
    {
      Console.WriteLine("Exception raised!");
      Console.WriteLine("Source : {0}" , e.Source);
      Console.WriteLine("Message : {0}" , e.Message);
    }

  }

}

C++

#using <System.dll>

using namespace System;
using namespace System::Net;
using namespace System::IO;
using namespace System::Text;
using namespace System::Threading;
public ref class RequestState
{
private:

   // This class stores the state of the request.
   literal int BUFFER_SIZE = 1024;

public:
   StringBuilder^ requestData;
   array<Byte>^bufferRead;
   WebRequest^ request;
   WebResponse^ response;
   Stream^ responseStream;
   RequestState()
   {
      bufferRead = gcnew array<Byte>(BUFFER_SIZE);
      requestData = gcnew StringBuilder( "" );
      request = nullptr;
      responseStream = nullptr;
   }

};

ref class WebRequest_BeginGetResponse
{
public:
   static ManualResetEvent^ allDone = gcnew ManualResetEvent(
 false );
   literal int BUFFER_SIZE = 1024;
   static void RespCallback( IAsyncResult^
 asynchronousResult )
   {
      try
      {
         
         // Set the State of request to asynchronous.
         RequestState^ myRequestState = dynamic_cast<RequestState^>(asynchronousResult->AsyncState);
         WebRequest^ myWebRequest1 = myRequestState->request;
         
         // End the Asynchronous response.
         myRequestState->response = myWebRequest1->EndGetResponse( asynchronousResult
 );
         
         // Read the response into a 'Stream' object.
         Stream^ responseStream = myRequestState->response->GetResponseStream();
         myRequestState->responseStream = responseStream;
         
         // Begin the reading of the contents of the HTML page and print
 it to the console.
         IAsyncResult^ asynchronousResultRead = responseStream->BeginRead( myRequestState->bufferRead,
 0, BUFFER_SIZE, gcnew AsyncCallback( ReadCallBack ), myRequestState );
      }
      catch ( WebException^ e ) 
      {
         Console::WriteLine( "WebException raised!" );
         Console::WriteLine( "\n {0}", e->Message );
         Console::WriteLine( "\n {0}", e->Status );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( "Exception raised!" );
         Console::WriteLine( "Source : {0}", e->Source );
         Console::WriteLine( "Message : {0}", e->Message );
      }

   }

   static void ReadCallBack( IAsyncResult^
 asyncResult )
   {
      try
      {
         
         // Result state is set to AsyncState.
         RequestState^ myRequestState = dynamic_cast<RequestState^>(asyncResult->AsyncState);
         Stream^ responseStream = myRequestState->responseStream;
         int read = responseStream->EndRead( asyncResult );
         
         // Read the contents of the HTML page and then print to the
 console.
         if ( read > 0 )
         {
            myRequestState->requestData->Append( Encoding::ASCII->GetString(
 myRequestState->bufferRead, 0, read ) );
            IAsyncResult^ asynchronousResult = responseStream->BeginRead( myRequestState->bufferRead,
 0, BUFFER_SIZE, gcnew AsyncCallback( ReadCallBack ), myRequestState );
         }
         else
         {
            Console::WriteLine( "\nThe HTML page Contents are:  " );
            if ( myRequestState->requestData->Length >
 1 )
            {
               String^ sringContent;
               sringContent = myRequestState->requestData->ToString();
               Console::WriteLine( sringContent );
            }
            Console::WriteLine( "\nPress 'Enter' key to continue........"
 );
            responseStream->Close();
            allDone->Set();
         }
      }
      catch ( WebException^ e ) 
      {
         Console::WriteLine( "WebException raised!" );
         Console::WriteLine( "\n {0}", e->Message );
         Console::WriteLine( "\n {0}", e->Status );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( "Exception raised!" );
         Console::WriteLine( "Source : {0}", e->Source );
         Console::WriteLine( "Message : {0}", e->Message );
      }

   }

};

int main()
{
   try
   {
      
      // Create a new webrequest to the mentioned URL.
      WebRequest^ myWebRequest = WebRequest::Create( "http://www.contoso.com"
 );
      
      // Please, set the proxy to a correct value.
      WebProxy^ proxy = gcnew WebProxy( "myproxy:80" );
      proxy->Credentials = gcnew NetworkCredential( "srikun","simrin123"
 );
      myWebRequest->Proxy = proxy;
      
      // Create a new instance of the RequestState.
      RequestState^ myRequestState = gcnew RequestState;
      
      // The 'WebRequest' object is associated to the 'RequestState'
 object.
      myRequestState->request = myWebRequest;
      
      // Start the Asynchronous call for response.
      IAsyncResult^ asyncResult = dynamic_cast<IAsyncResult^>(myWebRequest->BeginGetResponse(
 gcnew AsyncCallback( WebRequest_BeginGetResponse::RespCallback ), myRequestState
 ));
      WebRequest_BeginGetResponse::allDone->WaitOne();
      
      // Release the WebResponse resource.
      myRequestState->response->Close();
      Console::Read();
   }
   catch ( WebException^ e ) 
   {
      Console::WriteLine( "WebException raised!" );
      Console::WriteLine( "\n {0}", e->Message );
      Console::WriteLine( "\n {0}", e->Status );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception raised!" );
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }

}

import System.*;
import System.Net.*;
import System.IO.*;
import System.Text.*;
import System.Threading.*;

public class RequestState
{
    // This class stores the state of the request.
    private static final int
 BUFFER_SIZE = 1024;
    public StringBuilder requestData;
    public ubyte bufferRead[];
    public WebRequest request;
    public WebResponse response;
    public Stream responseStream;

    public RequestState()
    {
        bufferRead = new ubyte[BUFFER_SIZE];
        requestData = new StringBuilder("");
        request = null;
        responseStream = null;
    } //RequestState
} //RequestState

class WebRequest_BeginGetResponse
{
    public static ManualResetEvent allDone
 = new ManualResetEvent(false);
    private static final int
 BUFFER_SIZE = 1024;

    public static void main(String[]
 args)
    {
        try {
            // Create a new webrequest to the mentioned URL.   
            WebRequest myWebRequest = 
                WebRequest.Create("http://www.contoso.com");
            // Please, set the proxy to a correct value. 
            WebProxy proxy = new WebProxy("myproxy:80");

            proxy.set_Credentials(new NetworkCredential("srikun",
 "simrin123"));
            myWebRequest.set_Proxy(proxy);
            // Create a new instance of the RequestState.
            RequestState myRequestState = new RequestState();
            // The 'WebRequest' object is associated to the 'RequestState'
 object.
            myRequestState.request = myWebRequest;
            // Start the Asynchronous call for response.
            IAsyncResult asyncResult = (IAsyncResult)(myWebRequest.
                BeginGetResponse(new AsyncCallback(RespCallback)
,
                myRequestState));
            allDone.WaitOne();
            // Release the WebResponse resource.
            myRequestState.response.Close();
            Console.Read();
        }
        catch (WebException e) {
            Console.WriteLine("WebException raised!");
            Console.WriteLine("\n{0}", e.get_Message());
            Console.WriteLine("\n{0}", e.get_Status());
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception raised!");
            Console.WriteLine("Source : " + e.get_Source());
            Console.WriteLine("Message : " + e.get_Message());
        }
    } //main

    private static void RespCallback(IAsyncResult
 asynchronousResult)
    {
        try {
            // Set the State of request to asynchronous.
            RequestState myRequestState = (RequestState)(
                asynchronousResult.get_AsyncState());
            WebRequest myWebRequest1 = myRequestState.request;
            // End the Asynchronous response.
            myRequestState.response = myWebRequest1.EndGetResponse(
                asynchronousResult);
            // Read the response into a 'Stream' object.
            Stream responseStream = myRequestState.response.GetResponseStream();
            myRequestState.responseStream = responseStream;
            // Begin the reading of the contents of the HTML page and
 print it 
            // to the console.
            IAsyncResult asynchronousResultRead = responseStream.BeginRead(
                myRequestState.bufferRead, 0, BUFFER_SIZE, new
 AsyncCallback(
                ReadCallBack), myRequestState);
        }
        catch (WebException e) {
            Console.WriteLine("WebException raised!");
            Console.WriteLine("\n{0}", e.get_Message());
            Console.WriteLine("\n{0}", e.get_Status());
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception raised!");
            Console.WriteLine("Source : " + e.get_Source());
            Console.WriteLine("Message : " + e.get_Message());
        }
    } //RespCallback

    private static void
 ReadCallBack(IAsyncResult asyncResult)
    {
        try {
            // Result state is set to AsyncState.
            RequestState myRequestState = (RequestState)(
                asyncResult.get_AsyncState());
            Stream responseStream = myRequestState.responseStream;
            int read = responseStream.EndRead(asyncResult);
            // Read the contents of the HTML page and then print to the
 console.
            if (read > 0) {
                myRequestState.requestData.Append(Encoding.get_ASCII().
                    GetString(myRequestState.bufferRead, 0, read));
                IAsyncResult asynchronousResult = responseStream.BeginRead(
                    myRequestState.bufferRead, 0, BUFFER_SIZE,
                    new AsyncCallback(ReadCallBack), myRequestState);
            }
            else {
                Console.WriteLine("\nThe HTML page Contents are:  ");
                if (myRequestState.requestData.get_Length() >
 1) {
                    String sringContent;
                    sringContent = myRequestState.requestData.ToString();
                    Console.WriteLine(sringContent);
                }
                Console.WriteLine("\nPress 'Enter' key to continue........");
                responseStream.Close();
                allDone.Set();
            }
        }
        catch (WebException e) {
            Console.WriteLine("WebException raised!");
            Console.WriteLine("\n{0}", e.get_Message());
            Console.WriteLine("\n{0}", e.get_Status());
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception raised!");
            Console.WriteLine("Source : {0}", e.get_Source());
            Console.WriteLine("Message : {0}", e.get_Message());
        }
    } //ReadCallBack
} //WebRequest_BeginGetResponse

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
WebRequest クラス
WebRequest メンバ
System.Net 名前空間
EndGetResponse
GetResponse
その他の技術情報
非同期要求の作成

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WebRequest.BeginGetResponse メソッドとは？わかりやすく解説