beginread

TcpClient; NetworkStream; ReadAsync; C#

こ雲淡風輕ζ 提交于 2019-12-21 20:27:11
问题 Please excuse my lack of knowledge regarding Tasks and Async. Using the TcpClient class I am creating a connection with an available server: void async RunClientAsync() { TcpClient client = new TcpClient(); try { await client.ConnectAsync(IPAddress.Parse("1.1.1.1"), 8889); Task.Start(() => ReadClientAsync(client)); } catch (Exception ex) { HandleException(ex); } } // ----- void async ReadClientAsync(TcpClient client) { byte[] bf = new byte[2048]; try { while(true) { int br = await client

SerialPort BaseStream BeginRead never invokes callback

浪子不回头ぞ 提交于 2019-12-11 21:49:48
问题 I have a SerialPort object I know is configured correctly because I can send data to the port and the DataReceived event is properly raised. However, when I try the solution presented in How to use SerialPort class more reliably which suggests using calls to BeginRead instead of the DataReceived event, my async callback is never invoked, and the call to BeginRead appears to "hang". byte[] buffer = new byte[4096]; void KickoffRead() { _serialPort.BaseStream.BeginRead(buffer, 0, buffer.Length,

TcpClient; NetworkStream; ReadAsync; C#

左心房为你撑大大i 提交于 2019-12-04 14:12:13
Please excuse my lack of knowledge regarding Tasks and Async. Using the TcpClient class I am creating a connection with an available server: void async RunClientAsync() { TcpClient client = new TcpClient(); try { await client.ConnectAsync(IPAddress.Parse("1.1.1.1"), 8889); Task.Start(() => ReadClientAsync(client)); } catch (Exception ex) { HandleException(ex); } } // ----- void async ReadClientAsync(TcpClient client) { byte[] bf = new byte[2048]; try { while(true) { int br = await client.NetworkStream().ReadAsync(); if (br > 0) { HandleInboundData(bf, br); } } } catch (Exception ex) {

Stop Stream.BeginRead()

无人久伴 提交于 2019-12-04 03:43:38
问题 i need to read data from my virtual com port and detect the message "Dreq". Once i press the connect button, it connects to my COM8 port and begins reading in a new thread. I also have a disconnect button in which i wish to close the reading and disconnect from the COM8 port. However, i have problems closing the BeginRead. public partial class Form1 : Form { SerialPort sp; Stream stream; IAsyncResult recv_result; private void button1_Click(object sender, EventArgs e) { sp = new SerialPort(

Stop Stream.BeginRead()

六月ゝ 毕业季﹏ 提交于 2019-12-01 19:35:13
i need to read data from my virtual com port and detect the message "Dreq". Once i press the connect button, it connects to my COM8 port and begins reading in a new thread. I also have a disconnect button in which i wish to close the reading and disconnect from the COM8 port. However, i have problems closing the BeginRead. public partial class Form1 : Form { SerialPort sp; Stream stream; IAsyncResult recv_result; private void button1_Click(object sender, EventArgs e) { sp = new SerialPort("COM8", 9600); sp.Open(); sp.ReadTimeout = 50000; sp.NewLine = "\n\r\0"; stream = sp.BaseStream; recv

BeginReceive / BeginRead timeouts

夙愿已清 提交于 2019-12-01 15:04:59
I'm using a NetworkStream & TcpClient to asynchronously receive data using BeginRead. I need to apply a time-out to this operation, such that after a specified amount of time the read will be aborted. As far as I'm able to tell, this isn't supported on NetworkStream or TcpClient - there is a ReceiveTimeout property, but this appears to only apply to the synchronous equivalent - 'Read'. Even the underlying Socket class doesn't appear to support timeouts in its BeginReceive method. I've searched on this issue and the only suggested resolution I've seen is to set up another background thread to

BeginReceive / BeginRead timeouts

℡╲_俬逩灬. 提交于 2019-12-01 13:55:29
问题 I'm using a NetworkStream & TcpClient to asynchronously receive data using BeginRead. I need to apply a time-out to this operation, such that after a specified amount of time the read will be aborted. As far as I'm able to tell, this isn't supported on NetworkStream or TcpClient - there is a ReceiveTimeout property, but this appears to only apply to the synchronous equivalent - 'Read'. Even the underlying Socket class doesn't appear to support timeouts in its BeginReceive method. I've

When using FileStream.ReadAsync() should I open the file in async mode?

人走茶凉 提交于 2019-11-30 07:56:53
问题 The old .Net way of performing asynchronous I/O for a FileStream is to use FileStream.BeginRead() and FileStream.EndRead(). The MSDN documentation for FileStream.BeginRead() states: FileStream provides two different modes of operation: synchronous I/O and asynchronous I/O. While either can be used, the underlying operating system resources might allow access in only one of these modes. By default, FileStream opens the operating system handle synchronously. In Windows, this slows down