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FileWebRequest::EndGetRequestStream Method

Ends an asynchronous request for a Stream instance that the application uses to write data.

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

public:
virtual Stream^ EndGetRequestStream(
	IAsyncResult^ asyncResult
) override

Parameters

asyncResult
Type: System::IAsyncResult

An IAsyncResult that references the pending request for a stream.

Return Value

Type: System.IO::Stream
A Stream object that the application uses to write data.

ExceptionCondition
ArgumentNullException

asyncResult is nullptr.

The EndGetRequestStream method completes an asynchronous stream request that was started by the BeginGetRequestStream method.

NoteNote:

To avoid timing issues with garbage collection, be sure to close the response stream by calling the Close method on the stream returned by the GetResponseStream method after calling the EndGetResponse method.

The following example uses the EndGetRequestStream method to end the asynchronous request for a Stream object.

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

};

ref class FileWebRequest_reqbeginend
{
public:
   static ManualResetEvent^ allDone = gcnew 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 = gcnew ASCIIEncoding;
         array<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 : {0}", e->Message );
      }

   }

};

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_reqbeginend <systemname>/<sharedfoldername>/<filename>\n" );
      Console::WriteLine( "Example:FileWebRequest_reqbeginend 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 associate the 'myWebRequest' to it.
         RequestDeclare^ requestDeclare = gcnew RequestDeclare;
         requestDeclare->myFileWebRequest = dynamic_cast<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 = dynamic_cast<IAsyncResult^>(requestDeclare->myFileWebRequest->BeginGetRequestStream( gcnew AsyncCallback( &FileWebRequest_reqbeginend::ReadCallback ), requestDeclare ));
         FileWebRequest_reqbeginend::allDone->WaitOne();
         Console::Read();
      }
      catch ( ProtocolViolationException^ e ) 
      {
         Console::WriteLine( "ProtocolViolationException is : {0}", e->Message );
      }
      catch ( InvalidOperationException^ e ) 
      {
         Console::WriteLine( "InvalidOperationException is : {0}", e->Message );
      }
      catch ( UriFormatException^ e ) 
      {
         Console::WriteLine( "UriFormatExceptionException is : {0}", e->Message );
      }

   }
}
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);
      }
   }
}   

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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