HttpWebRequest.EndGetResponse 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

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HttpWebRequest.EndGetResponse メソッド

インターネットリソースへの非同期要求を終了します。

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

Visual Basic (宣言)

Public Overrides Function
 EndGetResponse ( _
    asyncResult As IAsyncResult _
) As WebResponse

Visual Basic (使用法)

Dim instance As HttpWebRequest
Dim asyncResult As IAsyncResult
Dim returnValue As WebResponse

returnValue = instance.EndGetResponse(asyncResult)

public override WebResponse EndGetResponse (
    IAsyncResult asyncResult
)

C++

public:
virtual WebResponse^ EndGetResponse (
    IAsyncResult^ asyncResult
) override

public WebResponse EndGetResponse (
    IAsyncResult asyncResult
)

JScript

public override function EndGetResponse (
    asyncResult : IAsyncResult
) : WebResponse

パラメータ

asyncResult: 応答の保留中の要求。

戻り値
インターネットリソースからの応答を格納している WebResponse。

例外

例外の種類	条件
ArgumentNullException	asyncResult が null 参照 (Visual Basic では Nothing) です。
InvalidOperationException	このメソッドは、asyncResult を使用して既に呼び出されています。または ContentLength プロパティが 0 を超えていますが、データが要求ストリームに書き込まれていません。
WebException	Abort は既に呼び出されました。または要求の処理中にエラーが発生しました。
ArgumentException	現在のインスタンスによって、BeginGetResponse への呼び出しから asyncResult が返されませんでした。

解説

EndGetResponse メソッドは、BeginGetResponse メソッドを呼び出して開始したインターネットリソースの非同期要求を完了します。

メモ
このメンバは、アプリケーションでネットワークトレースが有効にされている場合にトレース情報を出力します。詳細については、「ネットワークのトレース」を参照してください。

使用例

EndGetResponse を使用して、インターネットリソースに対する非同期要求を終了するコード例を次に示します。

Visual Basic

  Try
    ' Create a new HttpWebrequest object to the desired URL.
    Dim myHttpWebRequest1 As HttpWebRequest
 = CType(WebRequest.Create("http://www.contoso.com"),
 HttpWebRequest)
    
    ' Create an instance of the RequestState and assign the previous
 myHttpWebRequest1
    ' object to it's request field.  
    Dim myRequestState As New
 RequestState()
    myRequestState.request = myHttpWebRequest1
    
    ' Start the Asynchronous request.
    Dim result As IAsyncResult = CType(myHttpWebRequest1.BeginGetResponse(AddressOf
 RespCallback, myRequestState), IAsyncResult)
    allDone.WaitOne()
  
    ' Release the HttpWebResponse resource.
    myRequestState.response.Close()
  Catch e As WebException
    Console.WriteLine(ControlChars.Cr + "Exception raised!")
    Console.WriteLine(ControlChars.Cr + "Message:{0}",
 e.Message)
    Console.WriteLine(ControlChars.Cr + "Status:{0}",
 e.Status)
    Console.WriteLine("Press any key to continue..........")
  
  Catch e As Exception
    Console.WriteLine(ControlChars.Cr + "Exception raised!")
    Console.WriteLine("Source :{0} ", e.Source)
    Console.WriteLine("Message : {0}", e.Message)
    Console.WriteLine("Press any key to continue..........")
    Console.Read()
  End Try
End Sub ' Main

Private Shared Sub RespCallback(asynchronousResult
 As IAsyncResult)
  Try
    ' State of request is asynchronous.
    Dim myRequestState As RequestState = CType(asynchronousResult.AsyncState,
 RequestState)
    Dim myHttpWebRequest2 As HttpWebRequest
 = myRequestState.request
    myRequestState.response = CType(myHttpWebRequest2.EndGetResponse(asynchronousResult),
 HttpWebResponse)
    ' Read the response into a Stream object.
    Dim responseStream As Stream = myRequestState.response.GetResponseStream()
    myRequestState.streamResponse = responseStream
    ' Begin the Reading of the contents of the HTML page and print it
 to the console.
    Dim asynchronousInputRead As IAsyncResult
 = responseStream.BeginRead(myRequestState.BufferRead, 0, BUFFER_SIZE, AddressOf
 ReadCallBack, myRequestState)
  Catch e As WebException
    Console.WriteLine(ControlChars.Cr + "Exception raised!")
    Console.WriteLine(ControlChars.Cr + "Message:{0}",
 e.Message)
    Console.WriteLine(ControlChars.Cr + "Status:{0}",
 e.Status)
  End Try 
End Sub ' RespCallback

Private Shared Sub ReadCallBack(asyncResult
 As IAsyncResult)
  Try
    Dim myRequestState As RequestState = CType(asyncResult.AsyncState,
 RequestState)
    Dim responseStream As Stream = myRequestState.streamResponse
    Dim read As Integer
 = responseStream.EndRead(asyncResult)
    '  Read the HTML page and then print it 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 contents of the
 Html page are : ")
      If myRequestState.requestData.Length > 1 Then
        Dim stringContent As String
        stringContent = myRequestState.requestData.ToString()
        Console.WriteLine(stringContent)
      End If
      Console.WriteLine("Press any key to continue..........")
      Console.ReadLine()
      responseStream.Close()
      allDone.Set()
    End If
  Catch e As WebException
    Console.WriteLine(ControlChars.Cr + "Exception raised!")
    Console.WriteLine(ControlChars.Cr + "Message:{0}",
 e.Message)
    Console.WriteLine(ControlChars.Cr + "Status:{0}",
 e.Status)
  End Try 
End Sub ' ReadCallBack

  try
  {      

    
    // Create a HttpWebrequest object to the desired URL.
    HttpWebRequest myHttpWebRequest1= (HttpWebRequest)WebRequest.Create("http://www.contoso.com");
    
    // Create an instance of the RequestState and assign the previous
 myHttpWebRequest1
    // object to it's request field.  
    RequestState myRequestState = new RequestState();  
    myRequestState.request = myHttpWebRequest1;


    // Start the asynchronous request.
    IAsyncResult result=
      (IAsyncResult) myHttpWebRequest1.BeginGetResponse(new AsyncCallback(RespCallback)
,myRequestState);

    allDone.WaitOne();
    
    // Release the HttpWebResponse resource.
    myRequestState.response.Close();
  }
  catch(WebException e)
  {
    Console.WriteLine("\nException raised!");
    Console.WriteLine("\nMessage:{0}",e.Message);
    Console.WriteLine("\nStatus:{0}",e.Status);
    Console.WriteLine("Press any key to continue..........");
  }
  catch(Exception e)
  {
    Console.WriteLine("\nException raised!");
    Console.WriteLine("Source :{0} " , e.Source);
    Console.WriteLine("Message :{0} " , e.Message);
    Console.WriteLine("Press any key to continue..........");
    Console.Read();
  }
}
private static void RespCallback(IAsyncResult
 asynchronousResult)
{  
  try
  {
    // State of request is asynchronous.
    RequestState myRequestState=(RequestState) asynchronousResult.AsyncState;
    HttpWebRequest  myHttpWebRequest2=myRequestState.request;
    myRequestState.response = (HttpWebResponse) myHttpWebRequest2.EndGetResponse(asynchronousResult);
    
    // Read the response into a Stream object.
    Stream responseStream = myRequestState.response.GetResponseStream();
    myRequestState.streamResponse=responseStream;
    
    // Begin the Reading of the contents of the HTML page and print
 it to the console.
    IAsyncResult asynchronousInputRead = responseStream.BeginRead(myRequestState.BufferRead,
 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), myRequestState);
  }
  catch(WebException e)
  {
    Console.WriteLine("\nException raised!");
    Console.WriteLine("\nMessage:{0}",e.Message);
    Console.WriteLine("\nStatus:{0}",e.Status);
    
  }
}
private static  void ReadCallBack(IAsyncResult
 asyncResult)
{
  try
  {

  RequestState myRequestState = (RequestState)asyncResult.AsyncState;
  Stream responseStream = myRequestState.streamResponse;
  int read = responseStream.EndRead( asyncResult );
  // Read the HTML page and then print it 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 contents of the Html page are : ");
    if(myRequestState.requestData.Length>1)
    {
      string stringContent;
      stringContent = myRequestState.requestData.ToString();
      Console.WriteLine(stringContent);
    }
    Console.WriteLine("Press any key to continue..........");
    Console.ReadLine();
    
    responseStream.Close();
    allDone.Set();
   
  }

  }
  catch(WebException e)
  {
    Console.WriteLine("\nException raised!");
    Console.WriteLine("\nMessage:{0}",e.Message);
    Console.WriteLine("\nStatus:{0}",e.Status);
    
  }

}

C++

   static void RespCallback( IAsyncResult^ asynchronousResult
 )
   {
      try
      {
         
         // State of request is asynchronous.
         RequestState^ myRequestState = dynamic_cast<RequestState^>(asynchronousResult->AsyncState);
         HttpWebRequest^ myHttpWebRequest2 = myRequestState->request;
         myRequestState->response = dynamic_cast<HttpWebResponse^>(myHttpWebRequest2->EndGetResponse(
 asynchronousResult ));
         
         // Read the response into a Stream object.
         Stream^ responseStream = myRequestState->response->GetResponseStream();
         myRequestState->streamResponse = responseStream;
         
         // Begin the Reading of the contents of the HTML page and print
 it to the console.
         IAsyncResult^ asynchronousInputRead = responseStream->BeginRead( myRequestState->BufferRead,
 0, BUFFER_SIZE, gcnew AsyncCallback( ReadCallBack ), myRequestState );
      }
      catch ( WebException^ e ) 
      {
         Console::WriteLine( "\nException raised!" );
         Console::WriteLine( "\nMessage: {0}", e->Message );
         Console::WriteLine( "\nStatus: {0}", e->Status );
      }

   }

   static void ReadCallBack( IAsyncResult^
 asyncResult )
   {
      try
      {
         RequestState^ myRequestState = dynamic_cast<RequestState^>(asyncResult->AsyncState);
         Stream^ responseStream = myRequestState->streamResponse;
         int read = responseStream->EndRead( asyncResult );
         
         // Read the HTML page and then print it 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 contents of the Html page are : "
 );
            if ( myRequestState->requestData->Length >
 1 )
            {
               String^ stringContent;
               stringContent = myRequestState->requestData->ToString();
               Console::WriteLine( stringContent );
            }
            Console::WriteLine( "Press any key to continue.........." );
            Console::ReadLine();
            responseStream->Close();
            allDone->Set();
         }
      }
      catch ( WebException^ e ) 
      {
         Console::WriteLine( "\nException raised!" );
         Console::WriteLine( "\nMessage: {0}", e->Message );
         Console::WriteLine( "\nStatus: {0}", e->Status );
      }

   }

};

int main()
{
   try
   {
      
      // Create a HttpWebrequest object to the desired URL.
      HttpWebRequest^ myHttpWebRequest1 = dynamic_cast<HttpWebRequest^>(WebRequest::Create(
 "http://www.contoso.com" ));
      
      // Create an instance of the RequestState and assign the previous
 myHttpWebRequest1
      // object to its request field.
      RequestState^ myRequestState = gcnew RequestState;
      myRequestState->request = myHttpWebRequest1;
      
      // Start the asynchronous request.
      IAsyncResult^ result = dynamic_cast<IAsyncResult^>(myHttpWebRequest1->BeginGetResponse(
 gcnew AsyncCallback( HttpWebRequest_BeginGetResponse::RespCallback ), myRequestState
 ));
      HttpWebRequest_BeginGetResponse::allDone->WaitOne();
      
      // Release the HttpWebResponse resource.
      myRequestState->response->Close();
   }
   catch ( WebException^ e ) 
   {
      Console::WriteLine( "\nException raised!" );
      Console::WriteLine( "\nMessage: {0}", e->Message );
      Console::WriteLine( "\nStatus: {0}", e->Status );
      Console::WriteLine( "Press any key to continue.........." );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "\nException raised!" );
      Console::WriteLine( "Source : {0} ", e->Source );
      Console::WriteLine( "Message : {0} ", e->Message );
      Console::WriteLine( "Press any key to continue.........." );
      Console::Read();
   }

}

        try {
            // Create a HttpWebrequest object to the desired URL.
            HttpWebRequest myHttpWebRequest1 = ((HttpWebRequest)
                (WebRequest.Create("http://www.contoso.com")));
            // Create an instance of the RequestState and assign the
 
            //previous myHttpWebRequest1
            // object to it's request field.  
            RequestState myRequestState = new RequestState();
            myRequestState.request = myHttpWebRequest1;
            // Start the asynchronous request.
            IAsyncResult result = (IAsyncResult)
                (myHttpWebRequest1.BeginGetResponse(new 
                AsyncCallback(RespCallback), myRequestState));
            allDone.WaitOne();
            // Release the HttpWebResponse resource.
            myRequestState.response.Close();
        }
        catch (WebException e) {
            Console.WriteLine("\nException raised!");
            Console.WriteLine("\nMessage:{0}", e.get_Message());
            Console.WriteLine("\nStatus:{0}", e.get_Status());
            Console.WriteLine("Press any key to continue..........");
        }
        catch (System.Exception e) {
            Console.WriteLine("\nException raised!");
            Console.WriteLine("Source :{0} ", e.get_Source());
            Console.WriteLine("Message :{0} ", e.get_Message());
            Console.WriteLine("Press any key to continue..........");
            Console.Read();
        }
    } //main

    private static void RespCallback(IAsyncResult
 asynchronousResult)
    {
        try {
            // State of request is asynchronous.
            RequestState myRequestState = (RequestState)
                (asynchronousResult.get_AsyncState());
            HttpWebRequest myHttpWebRequest2 = myRequestState.request;

            myRequestState.response = (HttpWebResponse)(myHttpWebRequest2.
                EndGetResponse(asynchronousResult));
            // Read the response into a Stream object.
            Stream responseStream = myRequestState.response.GetResponseStream();
            myRequestState.streamResponse = responseStream;

            // Begin the Reading of the contents of the HTML page and
 print
            // it to the console.
            IAsyncResult asynchronousInputRead = responseStream.BeginRead
                (myRequestState.bufferRead, 0, BUFFER_SIZE, 
                new AsyncCallback(ReadCallBack), myRequestState);
        }
        catch (WebException e) {
            Console.WriteLine("\nException raised!");
            Console.WriteLine("\nMessage:{0}", e.get_Message());
            Console.WriteLine("\nStatus:{0}", e.get_Status());
        }
    } //RespCallback

    private static void
 ReadCallBack(IAsyncResult asyncResult)
    {
        try {
            RequestState myRequestState = (RequestState)
                (asyncResult.get_AsyncState());
            Stream responseStream = myRequestState.streamResponse;
            int read = responseStream.EndRead(asyncResult);

            // Read the HTML page and then print it 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 contents of the Html page are : ");

                if (myRequestState.requestData.get_Length() >
 1) {
                    String stringContent;
                    stringContent = myRequestState.requestData.ToString();
                    Console.WriteLine(stringContent);
                }
                Console.WriteLine("Press any key to continue..........");
                Console.ReadLine();
                responseStream.Close();
                allDone.Set();
            }
        }
        catch (WebException e) {
            Console.WriteLine("\nException raised!");
            Console.WriteLine("\nMessage:{0}", e.get_Message());
            Console.WriteLine("\nStatus:{0}", e.get_Status());
        }
    } //ReadCallBack
} //HttpWebRequest_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
HttpWebRequest クラス
HttpWebRequest メンバ
System.Net 名前空間

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HttpWebRequest.EndGetResponse メソッドとは？ わかりやすく解説

HttpWebRequest.EndGetResponse メソッド

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HttpWebRequest.EndGetResponse メソッドとは？わかりやすく解説