FileWebRequest.EndGetRequestStream メソッド

2008-03-28

アプリケーションがデータを書き込むために使用する Stream インスタンスの非同期要求を終了します。

Overrides Public Function EndGetRequestStream( _
   ByVal asyncResult As IAsyncResult _) As Stream
[C#]
public override Stream EndGetRequestStream(IAsyncResultasyncResult);
[C++]
public: Stream* EndGetRequestStream(IAsyncResult* asyncResult);
[JScript]
public override function EndGetRequestStream(
   asyncResult : IAsyncResult) : Stream;

パラメータ

asyncResult
ストリームの保留中の要求を参照する IAsyncResult 。

戻り値

アプリケーションがデータを書き込むために使用する Stream インスタンス。

例外

例外の種類	条件
ArgumentNullException	asyncResult が null 参照 (Visual Basic では Nothing) です。

解説

EndGetRequestStream メソッドは、 BeginGetRequestStream メソッドが開始したストリームの非同期要求を完了します。

メモガベージコレクションのタイミングに関する問題を回避するには、 EndGetResponse を呼び出した後に、 GetResponseStream によって返されるストリームの Close メソッドを呼び出して、応答ストリームを閉じてください。

使用例

[Visual Basic, C#, C++] EndGetRequestStream メソッドを使用して、 Stream インスタンスに対する非同期要求を終了する例を次に示します。

 
Public Class RequestDeclare
    Public myFileWebRequest As FileWebRequest
    Public userinput As [String]
    
    
    Public Sub New()
        myFileWebRequest = Nothing
    End Sub ' New
End Class ' RequestDeclare


Class FileWebRequest_reqbeginend
    Public Shared allDone As New ManualResetEvent(False)
    
    ' Entry point which delegates to C-style main Private Function.
    Public Overloads Shared Sub Main()
        Main(System.Environment.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_reqbeginend <systemname>/<sharedfoldername>/<filename>")
        Console.WriteLine("Example: FileWebRequest_reqbeginend 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 associate the 'myWebRequest' to it.        
                Dim requestDeclare As New RequestDeclare()
                requestDeclare.myFileWebRequest = CType(myWebRequest, FileWebRequest)
                ' Set the 'Method' property of 'FileWebRequest' object to 'POST' method.
                requestDeclare.myFileWebRequest.Method = "POST"
                Console.WriteLine("Enter the string you want to write into the file:")
                requestDeclare.userinput = Console.ReadLine()
                
                ' Begin the Asynchronous request for getting file content using 'BeginGetRequestStream()' method .
                Dim r As IAsyncResult = CType(requestDeclare.myFileWebRequest.BeginGetRequestStream(AddressOf ReadCallback, requestDeclare), IAsyncResult)
                allDone.WaitOne()
                
                Console.Read()
            Catch e As ProtocolViolationException
                Console.WriteLine(("ProtocolViolationException is :" + e.Message))
            Catch e As InvalidOperationException
                Console.WriteLine(("InvalidOperationException is :" + e.Message))
            Catch e As UriFormatException
                Console.WriteLine(("UriFormatExceptionException is :" + e.Message))
            End Try

        End If 
    End Sub 'Main
    
    
    Private Shared Sub ReadCallback(ar As IAsyncResult)
        Try

            ' State of the request is asynchronous.
            Dim requestDeclare As RequestDeclare = CType(ar.AsyncState, RequestDeclare)
            Dim myFileWebRequest As FileWebRequest = requestDeclare.myFileWebRequest
            Dim sendToFile As [String] = requestDeclare.userinput
            
            ' End the Asynchronus request by calling the 'EndGetRequestStream()' method.
            Dim readStream As Stream = myFileWebRequest.EndGetRequestStream(ar)
            
            ' Convert the string into byte array.
            Dim encoder As New ASCIIEncoding()
            Dim byteArray As Byte() = encoder.GetBytes(sendToFile)
            
            ' Write to the stream.
            readStream.Write(byteArray, 0, sendToFile.Length)
            readStream.Close()
            allDone.Set()

            
            Console.WriteLine(ControlChars.Cr +"The String you entered was successfully written into the file.")
            Console.WriteLine(ControlChars.Cr +"Press Enter to continue.")

            Catch e As ApplicationException
            Console.WriteLine(("ApplicationException is :" + e.Message))
        End Try

    End Sub ' ReadCallback 

[C#] 

    public class RequestDeclare
    {
         public FileWebRequest myFileWebRequest;    
         public String userinput;
       
         public RequestDeclare()
        {
            myFileWebRequest = null;
        }
    }
    
    class FileWebRequest_reqbeginend
    {
        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_reqbeginend <systemname>/<sharedfoldername>/<filename>\nExample:FileWebRequest_reqbeginend shafeeque/shaf/hello.txt");
            
          }  
          else
          {

            try
             {

                  // Place a webrequest.
                  WebRequest myWebRequest= WebRequest.Create("file://"+args[0]);
               
                  // Create an instance of the 'RequestDeclare' and associate the 'myWebRequest' to it.        
                  RequestDeclare requestDeclare = new RequestDeclare();
                  requestDeclare.myFileWebRequest = (FileWebRequest)myWebRequest;
                  // Set the 'Method' property of 'FileWebRequest' object to 'POST' method.
                  requestDeclare.myFileWebRequest.Method="POST";
                  Console.WriteLine("Enter the string you want to write into the file:");
                  requestDeclare.userinput = Console.ReadLine();

                  // Begin the Asynchronous request for getting file content using 'BeginGetRequestStream()' method .
                  IAsyncResult r=(IAsyncResult) requestDeclare.myFileWebRequest.BeginGetRequestStream(new AsyncCallback(ReadCallback),requestDeclare);            
                  allDone.WaitOne();

                  Console.Read();
            }
            catch(ProtocolViolationException e)
            {
                  Console.WriteLine("ProtocolViolationException is :"+e.Message);
            }
            catch(InvalidOperationException e)
            {
                   Console.WriteLine("InvalidOperationException is :"+e.Message);
            }
            catch(UriFormatException e)
            {
                Console.WriteLine("UriFormatExceptionException is :"+e.Message);
             }
         }
        }

        private static void ReadCallback(IAsyncResult ar)
        {    

         try
         {

              // State of the request is asynchronous.
              RequestDeclare requestDeclare=(RequestDeclare) ar.AsyncState;
              FileWebRequest myFileWebRequest=requestDeclare.myFileWebRequest;
              String sendToFile = requestDeclare.userinput;

              // End the Asynchronus request by calling the 'EndGetRequestStream()' method.
              Stream readStream=myFileWebRequest.EndGetRequestStream(ar);
                        
              // Convert the string into byte array.
                
              ASCIIEncoding encoder = new ASCIIEncoding();
              byte[] byteArray = encoder.GetBytes(sendToFile);
            
              // Write to the stream.
              readStream.Write(byteArray,0,sendToFile.Length);
              readStream.Close();
              allDone.Set();
                
              Console.WriteLine("\nThe String you entered was successfully written into the file.");
             Console.WriteLine("\nPress Enter to continue.");    


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

        }

[C++] 
public __gc class RequestDeclare {
public:
   FileWebRequest*  myFileWebRequest;
   String*  userinput;

   RequestDeclare() {
      myFileWebRequest = 0;
   }
};

__gc class FileWebRequest_reqbeginend
{
public:
   static ManualResetEvent * allDone = new ManualResetEvent(false);

   static void ReadCallback(IAsyncResult* ar) {
      try {
         // State of the request is asynchronous.
         RequestDeclare* requestDeclare = dynamic_cast<RequestDeclare*> (ar->AsyncState);
         FileWebRequest* myFileWebRequest=requestDeclare->myFileWebRequest;
         String*  sendToFile = requestDeclare->userinput;

         // End the Asynchronus request by calling the 'EndGetRequestStream()' method.
         Stream* readStream=myFileWebRequest->EndGetRequestStream(ar);

         // Convert the String* into Byte array.

         ASCIIEncoding* encoder = new ASCIIEncoding();
         Byte byteArray[] = encoder->GetBytes(sendToFile);

         // Write to the stream.
         readStream->Write(byteArray, 0, sendToFile->Length);
         readStream->Close();
         allDone->Set();

         Console::WriteLine(S"\nThe String you entered was successfully written into the file.");
         Console::WriteLine(S"\nPress Enter to continue.");

      } catch (ApplicationException* e) {
         Console::WriteLine(S"ApplicationException is : {0}", e->Message);
      }
   }
};

int main() {
   String* args[] = Environment::GetCommandLineArgs();
   if (args->Length < 2) {
      Console::WriteLine(S"\nPlease enter the file name as command line parameter:");
      Console::WriteLine(S"Usage:FileWebRequest_reqbeginend <systemname>/<sharedfoldername>/<filename>\n");
      Console::WriteLine(S"Example:FileWebRequest_reqbeginend shafeeque/shaf/hello.txt");
   } else {
      try {

         // Place a webrequest.
         WebRequest* myWebRequest= WebRequest::Create(String::Concat(S"file://", args[1]));

         // Create an instance of the 'RequestDeclare' and associate the 'myWebRequest' to it.
         RequestDeclare* requestDeclare = new RequestDeclare();
         requestDeclare->myFileWebRequest = dynamic_cast<FileWebRequest*>(myWebRequest);
         // Set the 'Method' property of 'FileWebRequest' Object* to 'POST' method.
         requestDeclare->myFileWebRequest->Method=S"POST";
         Console::WriteLine(S"Enter the String* you want to write into the file:");
         requestDeclare->userinput = Console::ReadLine();

         // Begin the Asynchronous request for getting file content using 'BeginGetRequestStream()' method .
         IAsyncResult* r = dynamic_cast<IAsyncResult*>
            (requestDeclare->myFileWebRequest->BeginGetRequestStream(new AsyncCallback(0, 
            &FileWebRequest_reqbeginend::ReadCallback), requestDeclare));
         FileWebRequest_reqbeginend::allDone->WaitOne();

         Console::Read();
      } catch (ProtocolViolationException* e) {
         Console::WriteLine(S"ProtocolViolationException is : {0}", e->Message);
      } catch (InvalidOperationException* e) {
         Console::WriteLine(S"InvalidOperationException is : {0}", e->Message);
      } catch (UriFormatException* e) {
         Console::WriteLine(S"UriFormatExceptionException is : {0}", e->Message);
      }
   }
}

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタボタンをクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ

参照

次の方法で共有

FileWebRequest.EndGetRequestStream メソッド

パラメータ

戻り値

例外

解説

使用例

必要条件

参照

その他のリソース