Related
Signature pad sending empty
I'm using a Signature Pad, and Canvas by SkiaSharp, but when I sending after drawing by user and encode to base 64, on server only shows an empty canvas
async void OnSaveButtonClicked(object sender, EventArgs args)
{
using (SKImage image = SKImage.FromBitmap(saveBitmap))
{
try
{
SKData data = image.Encode(SKEncodedImageFormat.Png, 100);
var bytesImg = data.ToArray();
string imageBase64 = Convert.ToBase64String(bytesImg);
var respuesta = await this.ApiService.PostSignature(
this.url,
this.Id,
imageBase64
);
Method to send on Services...
public async Task PostSignature(
string urlBase,
string folio,
string imageBase64)
{
try
{
var client = new HttpClient();
var response = await client.PostAsync(urlBase,
new StringContent(string.Format(
"idReporte={0}&imgFirma={1}",
folio, imageEncoded),
Encoding.UTF8, "application/x-www-form-urlencoded"));
if (!response.IsSuccessStatusCode)
{
return response.ToString();
}
else
{
var result = await response.Content.ReadAsStringAsync();
return result;
}
}
catch
{
return null;
}
}
END REQUEST...
catch (Exception ex)
{
await Application.Current.MainPage.DisplayAlert(
"Error",
"Image Is not Send, error: " + ex.Message,
"OK"
);
}
finally
{
completedPaths.Clear();
inProgressPaths.Clear();
UpdateBitmap();
canvasView.InvalidateSurface();
}
The image is empty, is decoded OK and loaded in folder path.
According to your description, you want to get image from signature pad, and converting it into base 64, I do one simple that you can take a look,just cast your imagestream to memorystream
<StackLayout>
<forms:SignaturePadView
x:Name="signaturepad"
BackgroundColor="Black"
HeightRequest="350"
StrokeColor="White"
StrokeWidth="3"
WidthRequest="250" />
<Button
x:Name="save"
Clicked="Save_Clicked"
HeightRequest="50"
Text="save"
WidthRequest="200" />
</StackLayout>
private async void Save_Clicked(object sender, EventArgs e)
{
string base64String;
using (var memoryStream = new MemoryStream())
{
var signature = await signaturepad.GetImageStreamAsync(SignatureImageFormat.Png);
signature.CopyTo(memoryStream);
var byteArray = memoryStream.ToArray();
base64String = Convert.ToBase64String(byteArray);
}
}
I have one listBox named lstKosnicka and one ADD button named btnDodadi.
protected void btnDodadi_Click(object sender, EventArgs e)
{
DodadiVoKosnicka kosnicka = new DodadiVoKosnicka();
ListItem stavka = new ListItem();
List<ListItem> lista = new List<ListItem>();
stavka = kosnicka.novaStavka(lstPredlog.SelectedItem.Text);
lstKosnicka.DataSource = Session["kosnicka"] as List<ListItem>;
lstKosnicka.Items.Add(stavka);
lstKosnicka.DataBind();
Session["kosnicka"] = lstKosnicka;
lstPredlog.SelectedIndex = -1;
}
There is one more webForm with other listbox named lstKosnickaNajava, and I want to fill this list wtih the same items as lstKosnicka using Session["kosnicka"], but something is wrong. here is Najava.aspx code:
protected void Page_Load(object sender, EventArgs e)
{
HttpCookie kolace = Request.Cookies["korisnik"];
if (kolace != null)
{
lblNajavenKorisnik.Text = "Најавен коринсик " + kolace["KorisnickoIme"];
}
else
{
lblNajavenKorisnik.Text = "Нема најавени корисници";
}
if (!IsPostBack)
{
lstKosnickaNajava.DataSource = Session["kosnicka"] as List<ListItem>;
lstKosnickaNajava.DataBind();
}
}
but when I go from the first page to Najava.aspx the lstKosnickaNajava is empty.
Maybe you should try in btnDodadi_Click()
this code
List<string> lista;
if (Session["kosnicka"] == null)
{
lista = new List<string>();
}
else
{
lista=(List<string>)Session["kosnicka"];
}
if you add only text the list item can be string.
I forget to ask maybe you do this in PAge_Load method??
I am attempting to utilize MSDN's Asynchronous Client Socket code sample to connect and control some home equipment. As I understand, the sample code's ReceiveCallback method uses an instance of the EventWaitHandle ManualResetEvent and the method receiveDone.WaitOne() to hold processing of the current thread until the thread receives a signal that all of the socket's data has been transmitted from the remote device. After all of the socket's data has been transmitted (the socket's data is empty and bytesRead = 0), the Waithandle is removed and the application continues processing.
Unfortunately, by stepping-through the execution of the code, it appears that after the last time that the client returns data from the remote device, ReceiveCallback never returns to see if the data-queue is empty (i.e. bytesRead = 0), and thus never enters the "else" condition in ReceiveCallback where the state of the ManualResetEvent would have been reset and the application would have continued to process. Thus, since it never enters the "else" condition, ManualResetEvent is never reset and the application freezes.
Although I can remove the "receiveDone.WaitOne()" method from the code - permitting execution without waiting for the ManualResetEvent's notification that all of the data has been received; this returns a data-string from the equipment that is typically incomplete.
Am I using this code sample incorrectly? Has anyone seen this before or had any experience on how to work-around this issue?
7/14/2012 - UPDATE: After further testing of the MSDN's Asynchronous Client Socket Example, it became clear that ReceiveCallback actually re-polls the port and the "bytesRead = 0" condition is satisfied only when the socket is released (i.e. client.Shutdown(SocketShutdown.Both); client.Close(); ). If I understand this correctly, this means that the connection has to be closed to get past the receiveDone.WaitOne() method. If the connection is closed to satisfy the WaitOne() Waithandle, it totally defeats the purpose of the application in that I had been hoping to leave the connection open so that the application could listen for equipment updates, which happen continually.
7/16/2012 - UPDATE: I have written to Microsoft Tech Support who have responded that "We're doing research on this issue. It might take some time before we get back to you." As such, it seems that it doesn't appear that this challenge can be resolved at this time through massaging this code.
Without the availability of the Asynchronous Client Socket example code as a foundation for writing asynchronous communication procedures, may I ask if anyone can please suggest a replacement routine that is more reliable? There are three pieces of equipment, each with it's own ip-address and port number. Thus, it would be ideal if a class could be utilized, where an instance could be created for each device. Additionally, the port must remain open to receive spontaneous updates continually sent by the equipment. Lastly, the updates do not have a end character or defined length signalling that the transmission of the message is complete, thus the routine must continually poll the port for available data. Any advice or suggestions would be greatly appreciated.
7/18/2012 - WORKAROUND: After spending a considerable amount of time attempting to get the MSDN's Asynchronous Client Socket code sample working, it became clear that I would have to look elsewhere to get the device responses continuously recognized by the program. In the hope to save someone else the brain-damage, I have included the work-around that I used which seems to work well to this point. If anyone has any suggestions, please don't hesitate to add to this question!
//
// ORIGINAL CODE ATTEMPT
//
public static Socket LutronClient;
public static String LutronResponse = String.Empty;
private const int LutronPort = 4999;
private const string LutronIP = "192.168.1.71";
private static ManualResetEvent LutronConnectDone = new ManualResetEvent(false);
private static ManualResetEvent LutronSendDone = new ManualResetEvent(false);
private static ManualResetEvent LutronReceiveDone = new ManualResetEvent(false);
private static void StartLutronClient()
{
try
{
var lutronIPAddress = IPAddress.Parse(LutronIP);
var lutronRemoteEP = new IPEndPoint(lutronIPAddress, LutronPort);
LutronClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
LutronClient.BeginConnect(lutronRemoteEP, LutronConnectCallback, LutronClient);
LutronConnectDone.WaitOne();
LutronSend(LutronClient, "sdl,14,100,0,S2\x0d");
LutronSendDone.WaitOne();
LutronReceive(LutronClient);
LutronReceiveDone.WaitOne(new TimeSpan(5000));
MessageBox.Show("Response received from Lutron: " + LutronResponse);
txtBoxLutron.Text = LutronResponse;
LutronClient.Shutdown(SocketShutdown.Both);
LutronClient.Close();
}
catch (Exception e) { MessageBox.Show(e.ToString()); }
}
private static void LutronConnectCallback(IAsyncResult lutronAr)
{
try
{
var lutronClient = (Socket)lutronAr.AsyncState;
lutronClient.EndConnect(lutronAr);
LutronConnectDone.Set();
}
catch (Exception e) { MessageBox.Show(e.ToString()); }
}
private static void LutronReceive(Socket lutronClient)
{
try
{
var lutronState = new LutronStateObject { LutronWorkSocket = lutronClient };
lutronClient.BeginReceive(lutronState.LutronBuffer, 0, LutronStateObject.BufferSize, 0, new AsyncCallback(LutronReceiveCallback), lutronState);
}
catch (Exception e) { MessageBox.Show(e.ToString()); }
}
private static void LutronReceiveCallback(IAsyncResult lutronAR)
{
try
{
var lutronState = (LutronStateObject)lutronAR.AsyncState;
var lutronClient = lutronState.LutronWorkSocket;
var bytesRead = lutronClient.EndReceive(lutronAR);
if (bytesRead > 0)
{
lutronState.LutronStringBuilder.AppendLine(Encoding.ASCII.GetString(lutronState.LutronBuffer, 0, bytesRead));
lutronClient.BeginReceive(lutronState.LutronBuffer, 0, LutronStateObject.BufferSize, 0, new AsyncCallback(LutronReceiveCallback), lutronState);
}
else
{
if (lutronState.LutronStringBuilder.Length > 0) { LutronResponse = lutronState.LutronStringBuilder.ToString(); }
LutronReceiveDone.Set();
}
}
catch (Exception e) { MessageBox.Show(e.ToString()); }
}
public static void LutronSend(Socket client, String data)
{
var byteData = Encoding.ASCII.GetBytes(data);
client.BeginSend(byteData, 0, byteData.Length, 0, LutronSendCallback, client);
}
private static void LutronSendCallback(IAsyncResult ar)
{
try
{
var client = (Socket)ar.AsyncState;
var bytesSent = client.EndSend(ar);
LutronSendDone.Set();
}
catch (Exception e) { MessageBox.Show(e.ToString()); }
}
public class LutronStateObject
{
public Socket LutronWorkSocket;
public const int BufferSize = 256;
public byte[] LutronBuffer = new byte[BufferSize];
public StringBuilder LutronStringBuilder = new StringBuilder();
}
}
This is the work-around I used:
//
// WORK-AROUND
//
using System;
using System.Windows.Forms;
namespace _GlobalCacheInterface
{
public partial class GlobalCacheDataScreen : Form
{
//Interface objects
private static GC_Interface _lutronInterface;
private const int LutronPort = 4999;
private const string LutronIP = "192.168.1.71";
delegate void ThreadSafeLutronCallback(string text);
private static GC_Interface _elanInterface;
private const int ElanPort = 4998;
private const string ElanIP = "192.168.1.70";
delegate void ThreadSafeElanCallback(string text);
private static GC_Interface _tuneSuiteInterface;
private const int TuneSuitePort = 5000;
private const string TuneSuiteIP = "192.168.1.70";
delegate void ThreadSafeTuneSuiteCallback(string text);
public GlobalCacheDataScreen()
{
InitializeComponent();
_lutronInterface = new GC_Interface(LutronIP, LutronPort);
_elanInterface = new GC_Interface(ElanIP, ElanPort);
_tuneSuiteInterface = new GC_Interface(TuneSuiteIP, TuneSuitePort);
// Create event handlers to notify application of available updated information.
_lutronInterface.DataAvailable += (s, e) => ThreadSafeTxtBoxLutron(_lutronInterface._returnString);
_elanInterface.DataAvailable += (s, e) => ThreadSafeTxtBoxElan(_elanInterface._returnString);
_tuneSuiteInterface.DataAvailable += (s, e) => ThreadSafeTxtBoxTuneSuite(_tuneSuiteInterface._returnString);
_lutronInterface.Connected += (s, e) => UpdateUI();
_elanInterface.Connected += (s, e) => UpdateUI();
_tuneSuiteInterface.Connected += (s, e) => UpdateUI();
UpdateUI();
}
private void UpdateUI()
{
_buttonConnectToLutron.Enabled = !_lutronInterface._isConnected;
_buttonConnectToElan.Enabled = !_elanInterface._isConnected;
_buttonConnectToTuneSuite.Enabled = !_tuneSuiteInterface._isConnected;
_buttonDisconnectFromLutron.Enabled = _lutronInterface._isConnected;
_buttonDisconnectFromElan.Enabled = _elanInterface._isConnected;
_buttonDisconnectFromTuneSuite.Enabled = _tuneSuiteInterface._isConnected;
string connectLutronStatus = _lutronInterface._isConnected ? "Connected" : "Not Connected";
string connectElanStatus = _elanInterface._isConnected ? "Connected" : "Not Connected";
string connectTuneSuiteStatus = _tuneSuiteInterface._isConnected ? "Connected" : "Not Connected";
_textBoxLutronConnectStatus.Text = connectLutronStatus;
_textBoxElanConnectStatus.Text = connectElanStatus;
_textBoxTuneSuiteConnectStatus.Text = connectTuneSuiteStatus;
}
private void ThreadSafeTxtBoxLutron(string message) { if (_lutronRichTextRxMessage.InvokeRequired) { var d = new ThreadSafeLutronCallback(ThreadSafeTxtBoxLutron); _lutronRichTextRxMessage.Invoke(d, new object[] { message }); } else { _lutronRichTextRxMessage.Text = message; } }
private void ThreadSafeTxtBoxElan(string message) { if (_elanRichTextRxMessage.InvokeRequired) { var d = new ThreadSafeElanCallback(ThreadSafeTxtBoxElan); _elanRichTextRxMessage.Invoke(d, new object[] { message }); } else { _elanRichTextRxMessage.Text = message; if (message.EndsWith("\r")) { MessageBoxEx.Show(message, "Message from Lutron Elan", 1000); } } }
private void ThreadSafeTxtBoxTuneSuite(string message) { if (_tuneSuiteRichTextRxMessage.InvokeRequired) { var d = new ThreadSafeTuneSuiteCallback(ThreadSafeTxtBoxTuneSuite); _tuneSuiteRichTextRxMessage.Invoke(d, new object[] { message }); } else { _tuneSuiteRichTextRxMessage.Text = message; if (message.EndsWith("\r")) { MessageBoxEx.Show(message, "Message from TuneSuite", 1000); } } }
private void _buttonConnectToLutron_Click(object sender, EventArgs e) { _lutronInterface.Connect(); }
private void _buttonDisconnectFromLutron_Click(object sender, EventArgs e) { _lutronInterface.Disconnect(); }
private void _buttonConnectToElan_Click(object sender, EventArgs e) { _elanInterface.Connect(); }
private void _buttonDisconnectFromElan_Click(object sender, EventArgs e) { _elanInterface.Disconnect(); }
private void _buttonConnectToTuneSuite_Click(object sender, EventArgs e) { _tuneSuiteInterface.Connect(); }
private void _buttonDisconnectFromTuneSuite_Click(object sender, EventArgs e) { _tuneSuiteInterface.Disconnect(); }
private void _buttonLutronSendMessage_Click(object sender, EventArgs e) { _lutronInterface.SendCommand(_lutronRichTextTxMessage.Text); }
private void _buttonElanSendMessage_Click(object sender, EventArgs e) { _elanInterface.SendCommand(_elanRichTextTxMessage.Text); }
private void _buttonTuneSuiteSendMessage_Click(object sender, EventArgs e) { _tuneSuiteInterface.SendCommand(_elanRichTextTxMessage.Text); }
private void _buttonLightOn_Click(object sender, EventArgs e) { _lutronInterface.SendCommand("sdl,14,100,0,S2"); }
private void _buttonLightOff_Click(object sender, EventArgs e) { _lutronInterface.SendCommand("sdl,14,0,0,S2"); }
private void _buttonStereoOnOff_Click(object sender, EventArgs e) { _elanInterface.SendCommand("sendir,4:3,1,40000,4,1,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,800"); }
private void _button30_Click(object sender, EventArgs e) { _tuneSuiteInterface.SendCommand("\xB8\x4D\xB5\x33\x30\x00\x30\x21\xB8"); }
private void _button31_Click(object sender, EventArgs e) { _tuneSuiteInterface.SendCommand("\xB8\x4D\xB5\x33\x31\x00\x30\x21\xB8"); }
private void _button26_Click(object sender, EventArgs e) { _tuneSuiteInterface.SendCommand("\xB8\x4D\xB5\x32\x36\x00\x30\x21\xB8"); }
}
}
and the GC_Interface class:
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;
namespace _GlobalCacheInterface
{
class GC_Interface
{
// Declare an event handler to notify when updates are available.
public event EventHandler<EventArgs> DataAvailable;
public string _returnString = "";
// Declare an event handler to notify status of connection.
public event EventHandler<EventArgs> Connected;
public bool _isConnected;
public AsyncCallback ReceiveCallback;
public Socket Client;
private string _ipAddress;
private int _port;
private bool _waitForEndCharacter;
private byte _endCharacter;
byte[] m_DataBuffer = new byte[10];
IAsyncResult m_Result;
public GC_Interface(string ipAddress, int port) { Init(ipAddress, port, false, 0); }
private void Init(string ipAddress, int port, bool waitForEndCharacter, byte endCharacter)
{
_ipAddress = ipAddress;
_port = port;
_waitForEndCharacter = waitForEndCharacter;
_endCharacter = endCharacter;
_isConnected = false;
}
public bool Connect()
{
try
{
// Create a TCP/IP socket.
Client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// Establish the remote endpoint for the socket.
var address = IPAddress.Parse(_ipAddress);
var remoteEP = new IPEndPoint(address, _port);
// Connect to the remote endpoint.
Client.Connect(remoteEP);
if (Client.Connected)
{
_isConnected = true;
ConnectedEventHandler();
WaitForData();
}
return true;
}
catch (SocketException se) { MessageBox.Show("\n connection failed, is the server running?\n" + se.Message ); return false; }
}
public bool SendCommand(string command)
{
try
{
// Convert the string data to byte data using ASCII encoding.
var byteData = Encoding.Default.GetBytes(command);
// Add a carraige-return to the end.
var newArray = new byte[byteData.Length + 1];
byteData.CopyTo(newArray, 0);
newArray[newArray.Length - 1] = 13;
if (Client == null) { return false; }
Client.Send(newArray);
return true;
}
catch (SocketException se) { MessageBox.Show(se.Message); return false; }
}
public void WaitForData()
{
try
{
if (ReceiveCallback == null) { ReceiveCallback = new AsyncCallback(OnDataReceived); }
var theSocPkt = new SocketPacket { thisSocket = Client };
m_Result = Client.BeginReceive(theSocPkt.DataBuffer, 0, theSocPkt.DataBuffer.Length, SocketFlags.None, ReceiveCallback, theSocPkt);
}
catch (SocketException se) { MessageBox.Show(se.Message); }
}
public class SocketPacket
{
public System.Net.Sockets.Socket thisSocket;
public byte[] DataBuffer = new byte[1];
}
public void OnDataReceived(IAsyncResult asyn)
{
try
{
SocketPacket theSockId = (SocketPacket)asyn.AsyncState;
var iRx = theSockId.thisSocket.EndReceive(asyn);
char[] Chars = new char[iRx + 1];
System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();
int CharLen = d.GetChars(theSockId.DataBuffer, 0, iRx, Chars, 0);
System.String szData = new System.String(Chars);
_returnString = _returnString + szData.Replace("\0", "");
// When an update is received, raise DataAvailable event
DataAvailableEventHandler();
WaitForData();
}
catch (ObjectDisposedException) { System.Diagnostics.Debugger.Log(0, "1", "\nOnDataReceived: Socket has been closed\n"); }
catch (SocketException se) { MessageBox.Show(se.Message); }
}
public bool Disconnect()
{
try
{
if (Client == null) { return false; }
Client.Close();
Client = null;
_isConnected = false;
return true;
}
catch (Exception) { return false; }
}
protected virtual void DataAvailableEventHandler()
{
var handler = DataAvailable;
if (handler != null) { handler(this, EventArgs.Empty); }
}
protected virtual void ConnectedEventHandler()
{
var handler = Connected;
if (handler != null) { handler(this, EventArgs.Empty); }
}
}
}
I had the same issue, adding an Available check to the code fixed my problem. Below is the revised code.
private static void ReceiveCallback( IAsyncResult ar ) {
try {
StateObject state = (StateObject) ar.AsyncState;
Socket client = state.workSocket;
int bytesRead = client.EndReceive(ar);
if (bytesRead > 0) {
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
// Check if there is anymore data on the socket
if (client.Available > 0) {
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);
}
}
if (bytesRead == 0 || client.Available == 0) {
if (state.sb.Length > 1) {
response = state.sb.ToString();
}
receiveDone.Set();
}
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}
Hope that helps.
I'm sidestepping the question here. I try to answer what you need, not what you ask for:
Use synchronous code. It will be easier to understand, you don't need callbacks or events. Also, for low thread counts, it is likely to perform better.
You also avoid bugs that you have in your current code. If an exception occurs your computation never completes. Synchronous code does not have that problem.
May I ask for help with the following?
I am attempting to connect and control three pieces of household electronic equipment by computer through a GlobalCache GC-100 and iTach. As you will see in the following code, I created a class ("GlobalCacheAdapter") that can communicate and control the equipment, and created an instance of the class for each piece of equipment. Although each instance seems to work well with communicating and in controlling each piece of equipment, the *feedback returned from the equipment* seems only to be visible at the defining class level's - "ReaderThreadProc" procedure. Further processing of the feedback is required for each piece of equipment and I am uncertain as to how to forward this feedback at the equipment specific instance-level. I suspect that an instance-specific EventHandler will need to be implemented; however I am not aware as to how to implement this type of instance-specific EventHandler in order to complete processing and update the appropriate controls.
Any help wold be greatly appreciated.
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
// Create three new instances of GlobalCacheAdaptor and connect.
// GC-100 (Elan) 192.168.1.70 4998
// GC-100 (TuneSuite) 192.168.1.70 5000
// GC iTach (Lighting) 192.168.1.71 4999
private GlobalCacheAdaptor elanGlobalCacheAdaptor;
private GlobalCacheAdaptor tuneSuiteGlobalCacheAdaptor;
private GlobalCacheAdaptor lutronGlobalCacheAdaptor;
public Form1()
{
InitializeComponent();
elanGlobalCacheAdaptor = new GlobalCacheAdaptor();
elanGlobalCacheAdaptor.ConnectToDevice(IPAddress.Parse("192.168.1.70"), 4998);
tuneSuiteGlobalCacheAdaptor = new GlobalCacheAdaptor();
tuneSuiteGlobalCacheAdaptor.ConnectToDevice(IPAddress.Parse("192.168.1.70"), 5000);
lutronGlobalCacheAdaptor = new GlobalCacheAdaptor();
lutronGlobalCacheAdaptor.ConnectToDevice(IPAddress.Parse("192.168.1.71"), 4999);
elanTextBox.Text = elanGlobalCacheAdaptor._line;
tuneSuiteTextBox.Text = tuneSuiteGlobalCacheAdaptor._line;
lutronTextBox.Text = lutronGlobalCacheAdaptor._line;
}
private void btnZoneOnOff_Click(object sender, EventArgs e) { elanGlobalCacheAdaptor.SendMessage("sendir,4:3,1,40000,4,1,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,181,21,800" + Environment.NewLine); }
private void btnSourceInput1_Click(object sender, EventArgs e) { elanGlobalCacheAdaptor.SendMessage("sendir,4:3,1,40000,1,1,20,179,20,179,20,179,20,179,20,179,20,179,20,179,20,278,20,179,20,179,20,179,20,780" + Environment.NewLine); }
private void btnSystemOff_Click(object sender, EventArgs e) { elanGlobalCacheAdaptor.SendMessage("sendir,4:3,1,40000,1,1,20,184,20,184,20,184,20,184,20,184,20,286,20,286,20,286,20,184,20,184,20,184,20,820" + Environment.NewLine); }
private void btnLightOff_Click(object sender, EventArgs e) { lutronGlobalCacheAdaptor.SendMessage("sdl,14,0,0,S2\x0d"); }
private void btnLightOn_Click(object sender, EventArgs e) { lutronGlobalCacheAdaptor.SendMessage("sdl,14,100,0,S2\x0d"); }
private void btnChannel31_Click(object sender, EventArgs e) { tuneSuiteGlobalCacheAdaptor.SendMessage("\xB8\x4D\xB5\x33\x31\x00\x30\x21\xB8\x0D"); }
private void btnChannel30_Click(object sender, EventArgs e) { tuneSuiteGlobalCacheAdaptor.SendMessage("\xB8\x4D\xB5\x33\x30\x00\x30\x21\xB8\x0D"); }
}
}
public class GlobalCacheAdaptor
{
public Socket _multicastListener;
public string _preferredDeviceID;
public IPAddress _deviceAddress;
public Socket _deviceSocket;
public StreamWriter _deviceWriter;
public bool _isConnected;
public int _port;
public IPAddress _address;
public string _line;
public GlobalCacheAdaptor() { }
public static readonly GlobalCacheAdaptor Instance = new GlobalCacheAdaptor();
public bool IsListening { get { return _multicastListener != null; } }
public GlobalCacheAdaptor ConnectToDevice(IPAddress address, int port)
{
if (_deviceSocket != null) _deviceSocket.Close();
try
{
_port = port;
_address = address;
_deviceSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
_deviceSocket.Connect(new IPEndPoint(address, port)); ;
_deviceAddress = address;
var stream = new NetworkStream(_deviceSocket);
var reader = new StreamReader(stream);
var writer = new StreamWriter(stream) { NewLine = "\r", AutoFlush = true };
_deviceWriter = writer;
writer.WriteLine("getdevices");
var readerThread = new Thread(ReaderThreadProc) { IsBackground = true };
readerThread.Start(reader);
_isConnected = true;
return Instance;
}
catch { DisconnectFromDevice(); MessageBox.Show("ConnectToDevice Error."); throw; }
}
public void SendMessage(string message)
{
try
{
var stream = new NetworkStream(_deviceSocket);
var reader = new StreamReader(stream);
var writer = new StreamWriter(stream) { NewLine = "\r", AutoFlush = true };
_deviceWriter = writer;
writer.WriteLine(message);
var readerThread = new Thread(ReaderThreadProc) { IsBackground = true };
readerThread.Start(reader);
}
catch { MessageBox.Show("SendMessage() Error."); }
}
public void DisconnectFromDevice()
{
if (_deviceSocket != null)
{
try { _deviceSocket.Close(); _isConnected = false; }
catch { MessageBox.Show("DisconnectFromDevice Error."); }
_deviceSocket = null;
}
_deviceWriter = null;
_deviceAddress = null;
}
**private void ReaderThreadProc(object state)**
{
var reader = (StreamReader)state;
try
{
while (true)
{
var line = reader.ReadLine();
if (line == null) break;
_line = _line + line + Environment.NewLine;
}
**// Feedback from each piece of equipment is visible here.
// Need to create EventHandler to notify the TextBoxes to update with _line**
}
catch { MessageBox.Show("ReaderThreadProc Error."); }
}
}
From my understanding of the question, you want to do something like this?
You need to know when a GlobalCacheAdapter updates and which one updated in order to update textboxes on a form. My question to you is this - do you actually need to know which updated?
If you declare in your class an event handler like this:
public class GlobalCacheAdaptor
{
public event EventHandler<EventArgs> Updated;
protected virtual void OnUpdated()
{
var handler = Updated;
if (handler != null)
{
handler(this, EventArgs.Empty);
}
}
private void Foo()
{
// When an update is received, raise Updated event
OnUpdated();
}
}
Then in your form subscribe to Updated for all three GlobalCacheHandler instances
public Form1()
{
elanGlobalCacheAdaptor.Updated += (s,e) =>
{
elanTextBox.Text = elanGlobalCacheAdaptor._line;
}
tuneSuiteGlobalCacheAdaptor.Updated += (s,e) =>
{
tuneSuiteTextBox.Text = tuneSuiteGlobalCacheAdaptor._line;
}
lutronGlobalCacheAdaptor.Updated += (s,e) =>
{
lutronTextBox.Text = lutronGlobalCacheAdaptor._line;
}
}
You should be able to update the correct text box when the appropriate cache handler raises the Updated event.
Finally you may need to handle cross-thread interactions. if so, see this article on MSDN, particularly the part "Thread-Safe Calls to a Windows Forms Control"
i am trying to show an error page when the user uploads a file that is over the limit (see Catching "Maximum request length exceeded")
in the global.asax i want to redirect to a controller action, so something like thisbut it does not work ?:
private void Application_Error(object sender, EventArgs e)
{
if (GlobalHelper.IsMaxRequestExceededEexception(this.Server.GetLastError()))
{
this.Server.ClearError();
return RedirectToAction("Home","Errorpage");
}
}
Try like this:
protected void Application_Error()
{
var exception = Server.GetLastError();
// TODO: Log the exception or something
Response.Clear();
Server.ClearError();
var routeData = new RouteData();
routeData.Values["controller"] = "Home";
routeData.Values["action"] = "ErrorPage";
Response.StatusCode = 500;
IController controller = new HomeController();
var rc = new RequestContext(new HttpContextWrapper(Context), routeData);
controller.Execute(rc);
}