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FileWebRequest.EndGetResponse Method

Ends an asynchronous request for a file system resource.

Namespace: System.Net
Assembly: System (in system.dll)

public:
virtual WebResponse^ EndGetResponse (
	IAsyncResult^ asyncResult
) override
public WebResponse EndGetResponse (
	IAsyncResult asyncResult
)
public override function EndGetResponse (
	asyncResult : IAsyncResult
) : WebResponse
Not applicable.

Parameters

asyncResult

An IAsyncResult that references the pending request for a response.

Return Value

A WebResponse that contains the response from the file system resource.

Exception typeCondition

ArgumentNullException

asyncResult is a null reference (Nothing in Visual Basic).

The EndGetResponse method completes an asynchronous request for a file system resource that was started with the BeginGetResponse method.

The following code example uses the EndGetResponse method to end an asynchronous request for a file system resource.

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 

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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