FileWebRequest.BeginGetRequestStream(AsyncCallback, Object) 메서드
정의
중요
일부 정보는 릴리스되기 전에 상당 부분 수정될 수 있는 시험판 제품과 관련이 있습니다. Microsoft는 여기에 제공된 정보에 대해 어떠한 명시적이거나 묵시적인 보증도 하지 않습니다.
데이터를 쓰는 데 사용할 Stream 개체에 대한 비동기 요청을 시작합니다.
public:
override IAsyncResult ^ BeginGetRequestStream(AsyncCallback ^ callback, System::Object ^ state);
public override IAsyncResult BeginGetRequestStream (AsyncCallback? callback, object? state);
public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state);
override this.BeginGetRequestStream : AsyncCallback * obj -> IAsyncResult
Public Overrides Function BeginGetRequestStream (callback As AsyncCallback, state As Object) As IAsyncResult
매개 변수
- callback
- AsyncCallback
AsyncCallback 대리자입니다.
- state
- Object
이 요청에 대한 상태 정보를 포함하는 개체입니다.
반환
비동기 요청을 참조하는 IAsyncResult입니다.
예외
Method 속성이 GET
이며 애플리케이션에서 스트림에 쓰려는 경우
스트림이 BeginGetRequestStream(AsyncCallback, Object)에 대한 이전 호출에서 사용되고 있는 경우
쓰기 스트림을 사용할 수 없는 경우
FileWebRequest가 중단되었습니다.
예제
다음 코드 예제에서는 개체에 대한 Stream 비동기 요청을 만드는 데 사용합니다BeginGetRequestStream.
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 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);
}
}
Public Class RequestDeclare
Public myFileWebRequest As FileWebRequest
Public userinput As [String]
Public Sub New()
myFileWebRequest = Nothing
End Sub
End Class
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
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
설명
이 메서드는 BeginGetRequestStream 파일 시스템 리소스에 데이터를 보내는 데 사용되는 스트림에 대한 비동기 요청을 시작합니다. 대리자를 AsyncCallback 구현하는 콜백 메서드는 메서드를 EndGetRequestStream 사용하여 요청 스트림을 반환합니다.