WebRequest.BeginGetRequestStream 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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WebRequest.BeginGetRequestStream メソッド

派生クラスでオーバーライドされると、GetRequestStream メソッドの非同期バージョンを提供します。

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

Visual Basic (宣言)

Public Overridable Function
 BeginGetRequestStream ( _
    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.BeginGetRequestStream(callback, state)

public virtual IAsyncResult BeginGetRequestStream (
    AsyncCallback callback,
    Object state
)

C++

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

public IAsyncResult BeginGetRequestStream (
    AsyncCallback callback, 
    Object state
)

JScript

public function BeginGetRequestStream (
    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

BeginGetRequestStream メソッドは、インターネットリソースにデータを送信するために使用するストリームへ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、EndGetRequestStream メソッドを使用して要求ストリームを返します。

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。

使用例

BeginGetRequestStream を使用して、要求ストリームを非同期的に取得する例を次に示します。

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 request state of the request.
    Public request As WebRequest
    
    Public Sub New()
        request = Nothing
    End Sub ' New
End Class ' RequestState


Class WebRequest_BeginGetRequeststream
    Public Shared allDone As
 New ManualResetEvent(False)
    
    Shared Sub Main()
          ' Create a new request.
            Dim myWebRequest As WebRequest
 = WebRequest.Create("http://www.contoso.com/codesnippets/next.asp")
 ' Create an instance of the RequestState and assign 
            ' myWebRequest' to it's request field.
            Dim myRequestState As New
 RequestState()
            myRequestState.request = myWebRequest
            myWebRequest.ContentType = "application/x-www-form-urlencoded"

            ' Set the 'Method' property  to 'POST' to post data to a
 Uri.
            myRequestState.request.Method = "POST"
            ' Start the asynchronous 'BeginGetRequestStream' method
 call.
            Dim r As IAsyncResult = CType(myWebRequest.BeginGetRequestStream(AddressOf
 ReadCallback, myRequestState), IAsyncResult)
            ' Pause the current thread until the async operation completes.
            allDone.WaitOne()
            ' Send the Post and get the response.
            Dim myWebResponse As WebResponse
 = myWebRequest.GetResponse()
            Console.WriteLine(ControlChars.Cr + "The string has
 been posted.")
            Console.WriteLine("Please wait for the response....")
            Dim streamResponse As Stream =
 myWebResponse.GetResponseStream()
            Dim streamRead As New
 StreamReader(streamResponse)
            Dim readBuff(256) As [Char]
            Dim count As Integer
 = streamRead.Read(readBuff, 0, 256)
            Console.WriteLine(ControlChars.Cr + "The contents
 of the HTML page are ")
            While count > 0
                Dim outputData As New
 [String](readBuff, 0, count)
                Console.WriteLine(outputData)
                count = streamRead.Read(readBuff, 0, 256)
            End While

           ' Close the Stream Object.
            streamResponse.Close()
            streamRead.Close()
            ' Release the HttpWebResponse Resource.
             myWebResponse.Close()
    End Sub ' Main
     
    Private Shared Sub ReadCallback(asynchronousResult
 As IAsyncResult)
            Dim myRequestState As RequestState
 = CType(asynchronousResult.AsyncState, RequestState)
            Dim myWebRequest As WebRequest
 = myRequestState.request
            ' End the request.
            Dim streamResponse As Stream =
 myWebRequest.EndGetRequestStream(asynchronousResult)
            ' Create a string that is to be posted to the uri.
            Console.WriteLine(ControlChars.Cr + "Please enter
 a string to be posted:")
            Dim postData As String
 = Console.ReadLine()
            Dim encoder As New
 ASCIIEncoding()
            ' Convert  the string into a byte array.
            Dim byteArray As Byte()
 = Encoding.UTF8.GetBytes(postData)
            ' Write the data to the stream.
            streamResponse.Write(byteArray, 0, postData.Length)
            streamResponse.Close()
            ' Allow the main thread to resume.
            allDone.Set()
    End Sub ' ReadCallback 
End Class ' WebRequest_BeginGetRequeststream

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

public class RequestState
{
    // This class stores the request state of the request.
    public WebRequest request;    
    public RequestState()
    {
        request = null;
    }
}

class WebRequest_BeginGetRequeststream
{
    public static ManualResetEvent allDone=
 new ManualResetEvent(false);
    static void Main()
    {
            // Create a new request to the mentioned URL.    
            WebRequest myWebRequest= WebRequest.Create("http://www.contoso.com");

            // Create an instance of the RequestState and assign 
            // 'myWebRequest' to it's request field.    
            RequestState myRequestState = new RequestState();
            myRequestState.request = myWebRequest;            
            myWebRequest.ContentType="application/x-www-form-urlencoded";

            // Set the 'Method' property  to 'POST' to post data to
 a Uri.
            myRequestState.request.Method="POST";
            // Start the Asynchronous 'BeginGetRequestStream' method
 call.    
            IAsyncResult r=(IAsyncResult) myWebRequest.BeginGetRequestStream(
                new AsyncCallback(ReadCallback),myRequestState);
            // Pause the current thread until the async operation completes.
            Console.WriteLine("main thread waiting...");
            allDone.WaitOne();   
            // Assign the response object of 'WebRequest' to a 'WebResponse'
 variable.
            WebResponse myWebResponse = myWebRequest.GetResponse();
            Console.WriteLine("The string has been posted.");
    
            Console.WriteLine("Please wait for the response...");

            Stream streamResponse = myWebResponse.GetResponseStream();
            StreamReader streamRead = new StreamReader( streamResponse
 );
            Char[] readBuff = new Char[256];
            int count = streamRead.Read( readBuff, 0, 256 );
            Console.WriteLine("\nThe contents of the HTML page are ");
    

            while (count > 0) 
            {
                String outputData = new String(readBuff, 0, count);
                Console.Write(outputData);
                count = streamRead.Read(readBuff, 0, 256);
            }

            // Close the Stream Object.
            streamResponse.Close();
            streamRead.Close();
 

            // Release the HttpWebResponse Resource.
            myWebResponse.Close();            
    }
    private static void
 ReadCallback(IAsyncResult asynchronousResult)
    {
            RequestState myRequestState =(RequestState) asynchronousResult.AsyncState;
            WebRequest  myWebRequest = myRequestState.request;

            // End the Asynchronus request.
            Stream streamResponse = myWebRequest.EndGetRequestStream(asynchronousResult);

            // Create a string that is to be posted to the uri.
            Console.WriteLine("Please enter a string to be
 posted:");
            string postData = Console.ReadLine();
            // Convert the string into a byte array.
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);

            // Write the data to the stream.
            streamResponse.Write(byteArray,0,postData.Length);
            streamResponse.Close();
            allDone.Set();
    }
}

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
{
public:

   // This class stores the request state of the request.
   WebRequest^ request;
   RequestState()
   {
      request = nullptr;
   }

};

ref class WebRequest_BeginGetRequeststream
{
public:
   static ManualResetEvent^ allDone = gcnew ManualResetEvent(
 false );
   static void ReadCallback( IAsyncResult^
 asynchronousResult )
   {
      RequestState^ myRequestState = dynamic_cast<RequestState^>(asynchronousResult->AsyncState);
      WebRequest^ myWebRequest = myRequestState->request;
      
      // End of the Asynchronus request.
      Stream^ streamResponse = myWebRequest->EndGetRequestStream( asynchronousResult
 );
      
      // Create a string that is to be posted to the uri.
      Console::WriteLine( "Please enter a string to be posted:"
 );
      String^ postData = Console::ReadLine();
      
      // Convert  the string into a Byte array.
      array<Byte>^byteArray = Encoding::UTF8->GetBytes( postData );
      
      // Write data to the stream.
      streamResponse->Write( byteArray, 0, postData->Length );
      streamResponse->Close();
      allDone->Set();
   }

};

int main()
{
   
   // Create a new request to the mentioned URL.
   WebRequest^ myWebRequest = WebRequest::Create( "http://www.contoso.com"
 );
   
   // Create an instance of the RequestState and assign 'myWebRequest'
 to its request field.
   RequestState^ myRequestState = gcnew RequestState;
   myRequestState->request = myWebRequest;
   myWebRequest->ContentType = "application/x-www-form-urlencoded";
   
   // Set the 'Method' prperty  to 'POST' to post data to a Uri.
   myRequestState->request->Method = "POST";
   
   // Start the Asynchronous 'BeginGetRequestStream' method call.
   IAsyncResult^ r = dynamic_cast<IAsyncResult^>(myWebRequest->BeginGetRequestStream(
 gcnew AsyncCallback( WebRequest_BeginGetRequeststream::ReadCallback ), myRequestState
 ));
   WebRequest_BeginGetRequeststream::allDone->WaitOne();
   WebResponse^ myWebResponse = myWebRequest->GetResponse();
   Console::WriteLine( "The String* entered has been posted." );
   Console::WriteLine( "Please wait for the response..."
 );
   Stream^ streamResponse = myWebResponse->GetResponseStream();
   StreamReader^ streamRead = gcnew StreamReader( streamResponse );
   array<Char>^readBuff = gcnew array<Char>(256);
   int count = streamRead->Read( readBuff, 0, 256 );
   Console::WriteLine( "The contents of the HTML page are " );
   while ( count > 0 )
   {
      String^ outputData = gcnew String( readBuff,0,count );
      Console::Write( outputData );
      count = streamRead->Read( readBuff, 0, 256 );
   }

   streamResponse->Close();
   streamRead->Close();
   
   // Release the HttpWebResponse Resource.
   myWebResponse->Close();
}

import System.*;
import System.Net.*;
import System.IO.*;
import System.Text.*;
import System.Threading.*;
public class RequestState
{
    // This class stores the request state of the request.
    public WebRequest request;

    public RequestState()
    {
        request = null;
    } //RequestState
} //RequestState

class WebRequest_BeginGetRequeststream
{
    public static ManualResetEvent allDone
 = new ManualResetEvent(false);

    public static void main(String[]
 args)
    {
        // Create a new request to the mentioned URL.    
        WebRequest myWebRequest = WebRequest.Create("http://www.contoso.com");
        // Create an instance of the RequestState and assign 
        // 'myWebRequest' to it's request field.    
        RequestState myRequestState = new RequestState();
        myRequestState.request = myWebRequest;
        myWebRequest.set_ContentType("application/x-www-form-urlencoded");
        // Set the 'Method' property  to 'POST' to post data to a Uri.
        myRequestState.request.set_Method("POST");

        // Start the Asynchronous 'BeginGetRequestStream' method call.
    
        IAsyncResult r = (IAsyncResult)(myWebRequest.BeginGetRequestStream(
            new AsyncCallback(ReadCallback), myRequestState));
        // Pause the current thread until the async operation completes.
        Console.WriteLine("main thread waiting...");
        allDone.WaitOne();
        // Assign the response object of 'WebRequest' to a 'WebResponse'
 
        // variable.
        WebResponse myWebResponse = myWebRequest.GetResponse();
        Console.WriteLine("The string has been posted.");
        Console.WriteLine("Please wait for the response...");

        Stream streamResponse = myWebResponse.GetResponseStream();
        StreamReader streamRead = new StreamReader(streamResponse);
        char readBuff[] = new char[256];
        int count = streamRead.Read(readBuff, 0, 256);
        Console.WriteLine("\nThe contents of the HTML page are ");

        while (count > 0) {
            String outputData = new String(readBuff, 0, count);
            Console.Write(outputData);
            count = streamRead.Read(readBuff, 0, 256);
        }
        // Close the Stream Object.
        streamResponse.Close();
        streamRead.Close();
        // Release the HttpWebResponse Resource.
        myWebResponse.Close();
    } //main

    private static void
 ReadCallback(IAsyncResult asynchronousResult)
    {
        RequestState myRequestState = 
            (RequestState) asynchronousResult.get_AsyncState();
        WebRequest myWebRequest = myRequestState.request;
        // End the Asynchronus request.
        Stream streamResponse = myWebRequest.EndGetRequestStream(
            asynchronousResult);
        // Create a string that is to be posted to the uri.
        Console.WriteLine("Please enter a string to be posted:");
        String postData = Console.ReadLine();
        // Convert the string into a byte array.
        ubyte byteArray[] = Encoding.get_UTF8().GetBytes(postData);
        // Write the data to the stream.
        streamResponse.Write(byteArray, 0, postData.get_Length());
        streamResponse.Close();
        allDone.Set();
    } //ReadCallback
} //WebRequest_BeginGetRequeststream

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
EndGetRequestStream
その他の技術情報
非同期要求の作成

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