using System;
using System.Net;
using System.Threading;
using System.IO;
namespace Examples.System.Net
{
public class FtpState
{
private ManualResetEvent wait;
private FtpWebRequest request;
private string fileName;
private Exception operationException = null;
string status;
public FtpState()
{
wait = new ManualResetEvent(false);
}
public ManualResetEvent OperationComplete
{
get {return wait;}
}
public FtpWebRequest Request
{
get {return request;}
set {request = value;}
}
public string FileName
{
get {return fileName;}
set {fileName = value;}
}
public Exception OperationException
{
get {return operationException;}
set {operationException = value;}
}
public string StatusDescription
{
get {return status;}
set {status = value;}
}
}
public class AsynchronousFtpUpLoader
{
// Command line arguments are two strings:
// 1. The url that is the name of the file being uploaded to the server.
// 2. The name of the file on the local machine.
//
public static void Main(string[] args)
{
// Create a Uri instance with the specified URI string.
// If the URI is not correctly formed, the Uri constructor
// will throw an exception.
ManualResetEvent waitObject;
Uri target = new Uri (args[0]);
string fileName = args[1];
FtpState state = new FtpState();
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(target);
request.Method = WebRequestMethods.Ftp.UploadFile;
// This example uses anonymous logon.
// The request is anonymous by default; the credential does not have to be specified.
// The example specifies the credential only to
// control how actions are logged on the server.
request.Credentials = new NetworkCredential ("anonymous","janeDoe@contoso.com");
// Store the request in the object that we pass into the
// asynchronous operations.
state.Request = request;
state.FileName = fileName;
// Get the event to wait on.
waitObject = state.OperationComplete;
// Asynchronously get the stream for the file contents.
request.BeginGetRequestStream(
new AsyncCallback (EndGetStreamCallback),
state
);
// Block the current thread until all operations are complete.
waitObject.WaitOne();
// The operations either completed or threw an exception.
if (state.OperationException != null)
{
throw state.OperationException;
}
else
{
Console.WriteLine("The operation completed - {0}", state.StatusDescription);
}
}
private static void EndGetStreamCallback(IAsyncResult ar)
{
FtpState state = (FtpState) ar.AsyncState;
Stream requestStream = null;
// End the asynchronous call to get the request stream.
try
{
requestStream = state.Request.EndGetRequestStream(ar);
// Copy the file contents to the request stream.
const int bufferLength = 2048;
byte[] buffer = new byte[bufferLength];
int count = 0;
int readBytes = 0;
FileStream stream = File.OpenRead(state.FileName);
do
{
readBytes = stream.Read(buffer, 0, bufferLength);
requestStream.Write(buffer, 0, readBytes);
count += readBytes;
}
while (readBytes != 0);
Console.WriteLine ("Writing {0} bytes to the stream.", count);
// IMPORTANT: Close the request stream before sending the request.
requestStream.Close();
// Asynchronously get the response to the upload request.
state.Request.BeginGetResponse(
new AsyncCallback (EndGetResponseCallback),
state
);
}
// Return exceptions to the main application thread.
catch (Exception e)
{
Console.WriteLine("Could not get the request stream.");
state.OperationException = e;
state.OperationComplete.Set();
return;
}
}
// The EndGetResponseCallback method
// completes a call to BeginGetResponse.
private static void EndGetResponseCallback(IAsyncResult ar)
{
FtpState state = (FtpState) ar.AsyncState;
FtpWebResponse response = null;
try
{
response = (FtpWebResponse) state.Request.EndGetResponse(ar);
response.Close();
state.StatusDescription = response.StatusDescription;
// Signal the main application thread that
// the operation is complete.
state.OperationComplete.Set();
}
// Return exceptions to the main application thread.
catch (Exception e)
{
Console.WriteLine ("Error getting response.");
state.OperationException = e;
state.OperationComplete.Set();
}
}
}
}