FileWebRequest.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

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FileWebRequest.BeginGetResponse メソッド

ファイルシステムリソースへ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 Overrides Function
 BeginGetResponse ( _
    callback As AsyncCallback, _
    state As Object _
) As IAsyncResult

Visual Basic (使用法)

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

returnValue = instance.BeginGetResponse(callback, state)

public override IAsyncResult BeginGetResponse (
    AsyncCallback callback,
    Object state
)

C++

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

public IAsyncResult BeginGetResponse (
    AsyncCallback callback, 
    Object state
)

JScript

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

パラメータ

callback: AsyncCallback デリゲート。

state: この要求のステータス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
InvalidOperationException	ストリームが、既に BeginGetResponse の前回の呼び出しで使用されています。

解説

AsyncCallback デリゲートを実装する非同期コールバックメソッドは、EndGetResponse メソッドを使用して実際の FileWebResponse を返します。

使用例

BeginGetResponse メソッドを使用して、ファイルシステムリソースに非同期的にアクセスするコード例を次に示します。

Visual Basic

Public Class RequestDeclare
    Public myFileWebRequest As FileWebRequest
     
    Public Sub New()
        myFileWebRequest = Nothing
    End Sub ' New
End Class ' RequestDeclare



Class FileWebRequest_resbeginend
    
    Public Shared allDone As
 New ManualResetEvent(False)
    
    ' Entry point which delegates to C-style main Private Function.
    Public Overloads Shared
 Sub Main()
        Main(GetCommandLineArgs())
    End Sub
    
    Overloads Shared Sub
 Main(args() As String)
        
        If args.Length < 2 Then
            Console.WriteLine(ControlChars.Cr + "Please enter
 the file name as command line parameter:")
            Console.WriteLine("Usage:FileWebRequest_resbeginend
 " + ChrW(60) + "systemname" + ChrW(62)
 + "/" + ChrW(60) + "sharedfoldername" + ChrW(62) + "/" + ChrW(60) +
 "filename" + ChrW(62) + ControlChars.Cr + "Example:FileWebRequest_resbeginend shafeeque/shaf/hello.txt")
        
        Else
            Try

                ' Place a webrequest.
                Dim myWebRequest As WebRequest
 = WebRequest.Create(("file://" + args(1)))
                ' Create an instance of the 'RequestDeclare' and associating
 the 'myWebRequest' to it.        
                Dim myRequestDeclare As New
 RequestDeclare()
                myRequestDeclare.myFileWebRequest = CType(myWebRequest, FileWebRequest)
                
                ' Begin the Asynchronous request for getting file content
 using 'BeginGetResponse()' method.    
                 Dim asyncResult As IAsyncResult
 = CType(myRequestDeclare.myFileWebRequest.BeginGetResponse(AddressOf
 RespCallback, myRequestDeclare), IAsyncResult)
                 allDone.WaitOne()

            
            Catch e As ArgumentNullException
                Console.WriteLine(("ArgumentNullException is :"
 + e.Message))
            Catch e As UriFormatException
                Console.WriteLine(("UriFormatException is :"
 + e.Message))
            End Try
        End If
    End Sub ' Main
    
    
    Private Shared Sub RespCallback(ar
 As IAsyncResult)



        ' State of request is asynchronous.
        Dim requestDeclare As RequestDeclare
 = CType(ar.AsyncState, RequestDeclare)
        
        Dim myFileWebRequest As FileWebRequest
 = requestDeclare.myFileWebRequest
        
        ' End the Asynchronus request by calling the 'EndGetResponse()'
 method.
        Dim myFileWebResponse As FileWebResponse
 = CType(myFileWebRequest.EndGetResponse(ar), FileWebResponse)
        
        ' Reade the response into Stream.
        Dim streamReader As New
 StreamReader(myFileWebResponse.GetResponseStream())

       
        Dim readBuffer(256) As [Char]
        
        Dim count As Integer
 = streamReader.Read(readBuffer, 0, 256)
        
        Console.WriteLine("The contents of the file are :"+ControlChars.Cr)
        
        While count > 0
            Dim str As New
 [String](readBuffer, 0, count)
            Console.WriteLine(str)
            count = streamReader.Read(readBuffer, 0, 256)
        End While
         streamReader.Close()
        ' Release the response object resources.
         myFileWebResponse.Close()
        allDone.Set()
        Console.WriteLine("File reading is over.")
    End Sub ' RespCallback 
End Class ' FileWebRequest_resbeginend

public class RequestDeclare
{
   public FileWebRequest myFileWebRequest;    
   
     public RequestDeclare()
    {
        myFileWebRequest = null;
    }
}


class FileWebRequest_resbeginend
{

    public static ManualResetEvent allDone
 = new ManualResetEvent(false);

    static void Main(string[]
 args)
    {
        
        if (args.Length < 1)
        {
           Console.WriteLine("\nPlease enter the file name as command line parameter:");
            Console.WriteLine("Usage:FileWebRequest_resbeginend <systemname>/<sharedfoldername>/<filename>\nExample:FileWebRequest_resbeginend
 shafeeque/shaf/hello.txt");
        }  
        else
        {
          try
        {


              // Place a 'Webrequest'.
              WebRequest myWebRequest= WebRequest.Create("file://"+args[0]);
              // Create an instance of the 'RequestDeclare' and associating
 the 'myWebRequest' to it.        
              RequestDeclare myRequestDeclare = new RequestDeclare();
              myRequestDeclare.myFileWebRequest = (FileWebRequest)myWebRequest;
          

              // Begin the Asynchronous request for getting file content
 using 'BeginGetResponse()' method.    
              IAsyncResult asyncResult =(IAsyncResult) myRequestDeclare.myFileWebRequest.BeginGetResponse(new
 AsyncCallback(RespCallback),myRequestDeclare);            
              allDone.WaitOne();

        
           }
        catch(ArgumentNullException e)
           {
              Console.WriteLine("ArgumentNullException is :"+e.Message);
           }
           catch(UriFormatException e)
          {
              Console.WriteLine("UriFormatException is :"+e.Message);
          }
       }
    }

  private static void RespCallback(IAsyncResult
 ar)
  {    


           // State of request is asynchronous.
            RequestDeclare requestDeclare=(RequestDeclare) ar.AsyncState;
                
            FileWebRequest  myFileWebRequest=requestDeclare.myFileWebRequest;
        
           // End the Asynchronus request by calling the 'EndGetResponse()'
 method.
            
            FileWebResponse myFileWebResponse = (FileWebResponse) myFileWebRequest.EndGetResponse(ar);


            // Reade the response into Stream.
            StreamReader streamReader= new StreamReader(myFileWebResponse.GetResponseStream());


            Char[] readBuffer = new Char[256];
                
            int count = streamReader.Read( readBuffer, 0, 256
 );

            Console.WriteLine("The contents of the file are :\n");
    
            while (count > 0) 
            {
                String str = new String(readBuffer, 0, count);
                Console.WriteLine(str);
                count = streamReader.Read(readBuffer, 0, 256);
            }
            
            streamReader.Close();
            // Release the response object resources.
            myFileWebResponse.Close();
            allDone.Set();
            Console.WriteLine("File reading is over.");    
    }

}

C++

public ref class RequestDeclare
{
public:
   FileWebRequest^ myFileWebRequest;
   RequestDeclare()
   {
      myFileWebRequest = nullptr;
   }

};

ref class FileWebRequest_resbeginend
{
public:
   static ManualResetEvent^ allDone = gcnew ManualResetEvent(
 false );
   static void RespCallback( IAsyncResult^
 ar )
   {
      
      // State of request is asynchronous.
      RequestDeclare^ requestDeclare = dynamic_cast<RequestDeclare^>(ar->AsyncState);
      FileWebRequest^ myFileWebRequest = requestDeclare->myFileWebRequest;
      
      // End the Asynchronus request by calling the 'EndGetResponse()'
 method.
      FileWebResponse^ myFileWebResponse = dynamic_cast<FileWebResponse^>(myFileWebRequest->EndGetResponse(
 ar ));
      
      // Reade the response into Stream.
      StreamReader^ streamReader = gcnew StreamReader( myFileWebResponse->GetResponseStream()
 );
      array<Char>^readBuffer = gcnew array<Char>(256);
      int count = streamReader->Read( readBuffer, 0, 256 );
      Console::WriteLine( "The contents of the file are :\n" );
      while ( count > 0 )
      {
         String^ str = gcnew String( readBuffer,0,count );
         Console::WriteLine( str );
         count = streamReader->Read( readBuffer, 0, 256 );
      }

      streamReader->Close();
      
      // Release the response Object* resources.
      myFileWebResponse->Close();
      allDone->Set();
      Console::WriteLine( "File reading is over." );
   }

};

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   if ( args->Length < 2 )
   {
      Console::WriteLine( "\nPlease enter the file name as command line parameter:"
 );
      Console::WriteLine( "Usage:FileWebRequest_resbeginend <systemname>/<sharedfoldername>/<filename>\n"
 );
      Console::WriteLine( "Example:FileWebRequest_resbeginend shafeeque/shaf/hello.txt"
 );
   }
   else
   {
      try
      {
         
         // Place a 'Webrequest'.
         WebRequest^ myWebRequest = WebRequest::Create( String::Concat( "file://",
 args[ 1 ] ) );
         
         // Create an instance of the 'RequestDeclare' and associating
 the 'myWebRequest' to it.
         RequestDeclare^ myRequestDeclare = gcnew RequestDeclare;
         myRequestDeclare->myFileWebRequest = dynamic_cast<FileWebRequest^>(myWebRequest);
         
         // Begin the Asynchronous request for getting file content
 using 'BeginGetResponse()' method.
         IAsyncResult^ asyncResult = dynamic_cast<IAsyncResult^>(myRequestDeclare->myFileWebRequest->BeginGetResponse(
 gcnew AsyncCallback( &FileWebRequest_resbeginend::RespCallback ), myRequestDeclare
 ));
         FileWebRequest_resbeginend::allDone->WaitOne();
      }
      catch ( ArgumentNullException^ e ) 
      {
         Console::WriteLine( "ArgumentNullException is : {0}", e->Message
 );
      }
      catch ( UriFormatException^ e ) 
      {
         Console::WriteLine( "UriFormatException is : {0}", e->Message
 );
      }

   }
}

public class RequestDeclare
{
    public FileWebRequest myFileWebRequest;

    public RequestDeclare()
    {
        myFileWebRequest = null;
    } //RequestDeclare
} //RequestDeclare

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

    public static void main(String[]
 args)
    {
        if (args.length < 1) {
            Console.WriteLine("\nPlease enter the file name as command line
 " 
                + " parameter:");
            Console.WriteLine("Usage:FileWebRequest_resbeginend <systemname>/"
 
                + "<sharedfoldername>/<filename>\nExample:"
 
            + "FileWebRequest_resbeginend shafeeque/shaf/hello.txt");
        }
        else {
            try {
                // Place a 'Webrequest'.
                WebRequest myWebRequest = WebRequest.Create("file://"
 
                    + args[0]);

                // Create an instance of the 'RequestDeclare' and associating
                // the 'myWebRequest' to it.        
                RequestDeclare myRequestDeclare = new RequestDeclare();
                myRequestDeclare.myFileWebRequest = 
                    (FileWebRequest)(myWebRequest);

                // Begin the Asynchronous request for getting file content
                // using 'BeginGetResponse()' method.    
                IAsyncResult asyncResult = (IAsyncResult)(myRequestDeclare.
                    myFileWebRequest.BeginGetResponse(new AsyncCallback(
                    RespCallback), myRequestDeclare));
                allDone.WaitOne();
            }
            catch (ArgumentNullException e) {
                Console.WriteLine("ArgumentNullException is :" 
                    + e.get_Message());
            }
            catch (UriFormatException e) {
                Console.WriteLine("UriFormatException is :" 
                    + e.get_Message());
            }
        }
    } //main

    private static void RespCallback(IAsyncResult
 ar)
    {
        // State of request is asynchronous.
        RequestDeclare requestDeclare = (RequestDeclare)(ar.
            get_AsyncState());
        FileWebRequest myFileWebRequest = requestDeclare.myFileWebRequest;

        // End the Asynchronus request by calling the
        // 'EndGetResponse()' method.
        FileWebResponse myFileWebResponse = (FileWebResponse)(myFileWebRequest
            .EndGetResponse(ar));

        // Reade the response into Stream.
        StreamReader streamReader = new StreamReader(myFileWebResponse
            .GetResponseStream());
        char readBuffer[] = new char[256];
        int count = streamReader.Read(readBuffer, 0, 256);

        Console.WriteLine("The contents of the file are :\n");
        while (count > 0) {
            String str = new String(readBuffer, 0, count);
            Console.WriteLine(str);
            count = streamReader.Read(readBuffer, 0, 256);
        }
        streamReader.Close();

        // Release the response object resources.
        myFileWebResponse.Close();
        allDone.Set();
        Console.WriteLine("File reading is over.");
    } //RespCallback
} //FileWebRequestResBeginEnd

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

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

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

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