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Provides connection services for an infrared connection.
Assembly: System.Net.IrDA (in System.Net.IrDA.dll)
This class provides services for an infrared endpoint that includes making connections, obtaining data streams, and discovering devices.
Because of protocol differences, you cannot interactively use the infrared beam features on a Pocket PC with a .NET Compact Framework infrared application. Protocol differences also exist with the built-in infrared features on a laptop or desktop computer.
Infrared connections are made by specifying a service name, which can be any value, provided the participating devices refer the same name.
The following example demonstrates how to send files between devices that use infrared communications. You need two Pocket PCs, one to send the file and the other to receive it. To run this sample, do the following:
Build the example.
Create a text file that is named send.txt in the My Documents folder of the device that will send the file.
Align the infrared ports of the devices.
On both devices, start the IrDADemo.exe application.
On both devices, click Discover for a list of infrared devices within range.
On the device that will receive the file, select the device that will send the file, and then click Receive. You must click this button before you click Send on the sending device.
On the device that will send the file, click the Send button.
The receiving device will receive the file, and the file's contents will be saved to a file named receive.txt in the My Documents folder.
Imports System Imports System.Windows.Forms Imports System.Net Imports System.Net.Sockets Imports System.IO Imports Microsoft.VisualBasic Public Class Form1 Inherits System.Windows.Forms.Form Private ListBox1 As System.Windows.Forms.ListBox Private StatusBar1 As System.Windows.Forms.StatusBar Private WithEvents Send As System.Windows.Forms.Button Private WithEvents Receive As System.Windows.Forms.Button Private WithEvents Discover As System.Windows.Forms.Button Dim irListen As IrDAListener Dim irClient As IrDAClient Dim irEndP As IrDAEndPoint Dim irDevices() As IrDADeviceInfo Private fileSend As String Private fileReceive As String Private irServiceName As String Private buffersize As Integer Public Sub New() InitializeComponent() End Sub Private Sub Form1_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load ' Display Pocket PC OK button for closing. Me.MinimizeBox = False End Sub Protected Overrides Sub Dispose(disposing As Boolean) MyBase.Dispose(disposing) End Sub Private Sub InitializeComponent() Me.Send = New System.Windows.Forms.Button Me.ListBox1 = New System.Windows.Forms.ListBox Me.Receive = New System.Windows.Forms.Button Me.StatusBar1 = New System.Windows.Forms.StatusBar Me.Discover = New System.Windows.Forms.Button ' ' Send ' Me.Send.Location = New System.Drawing.Point(16, 120) Me.Send.Size = New System.Drawing.Size(80, 20) Me.Send.Text = "Send File" ' ' ListBox1 ' Me.ListBox1.Location = New System.Drawing.Point(16, 48) Me.ListBox1.Size = New System.Drawing.Size(200, 58) ' ' Receive ' Me.Receive.Location = New System.Drawing.Point(136, 120) Me.Receive.Size = New System.Drawing.Size(80, 20) Me.Receive.Text = "Receive File" ' ' StatusBar1 ' Me.StatusBar1.Location = New System.Drawing.Point(0, 248) Me.StatusBar1.Size = New System.Drawing.Size(240, 22) ' ' Discover ' Me.Discover.Location = New System.Drawing.Point(16, 16) Me.Discover.Size = New System.Drawing.Size(112, 20) Me.Discover.Text = "Discover Devies" ' ' Form1 ' Me.Controls.Add(Discover) Me.Controls.Add(StatusBar1) Me.Controls.Add(Receive) Me.Controls.Add(ListBox1) Me.Controls.Add(Send) Me.Text = "IrDA Demo" End Sub Shared Sub Main() Application.Run(New Form1()) End Sub ' Discover and list the available infrared devices. ' Infrared ports must be aligned. Private Sub Discover_Click(sender As Object, e As System.EventArgs) _ Handles Discover.Click ' Create a collection of a maximum of three devices. irDevices = irClient.DiscoverDevices(2) ' Show a message if no devices are found. If irDevices.Length = 0 Then MessageBox.Show("No remote infrared devices found!") Return End If ' Enumerate the IrDADeviceInfo ' array and list device information ' for each device in the list box. Dim device As String Dim ID As Integer ListBox1.Items.Clear() For Each irDevice As IrDADeviceInfo In irDevices ID = BitConverter.ToInt32(irDevice.DeviceID, 0) device = ID.ToString() _ & " " & irDevice.DeviceName _ & " " & irDevice.CharacterSet _ & " " & irDevice.Hints ListBox1.Items.Add(device) Next irDevice ListBox1.SelectedIndex = 0 If irDevices.Length > 0 Then StatusBar1.Text = irDevices.Length.ToString() & " remote device(s)" End If ' Enable the Send and Receive buttons. Send.Enabled = True Receive.Enabled = True End Sub Private Sub IrDAConfig() irClient = New IrDAClient() ' Files for sending and receiving. fileSend = ".\My Documents\send.txt" fileReceive = ".\My Documents\receive.txt" ' Specify a name for the IrDA Service. ' It can be any name, provided all ' participating devices use the same name. irServiceName = "IrDAFtp" ' Set maximum buffer size for file transfers. buffersize = 256 ' Disable Send and Receive buttons until devices are discovered. Send.Enabled = False Receive.Enabled = False End Sub ' Sends a file. Private Sub Send_Click(sender As Object, e As System.EventArgs) _ Handles Send.Click ' Open the file to send and get its stream. Dim fs As Stream Try fs = New FileStream(fileSend, FileMode.Open) Catch exFile As Exception MessageBox.Show("Cannot open " & exFile.ToString()) Return End Try ' Create an IrDA client with a service name that must ' match the service name of the receiving IrDA client. Try irClient = New IrDAClient(irServiceName) Catch exS As SocketException MessageBox.Show("Create socket error: " & exS.Message & _ " - Did you click Receive on the other device?") Return End Try ' Get the underlying stream of the client. Dim baseStream As Stream = irClient.GetStream() ' Get the size of the file to send ' and write its size to the stream. Dim length As Byte() = BitConverter.GetBytes(Fix(fs.Length)) baseStream.Write(length, 0, length.Length) ' Create a buffer for reading the file. Dim buffer(buffersize) As Byte ' Display the number of bytes being sent. Dim fileLength As Integer = CInt(fs.Length) StatusBar1.Text = "Sending " & fileLength & " bytes" ' Read the file stream into the base stream. While fileLength > 0 Dim numRead As Integer = fs.Read(buffer, 0, buffer.Length) baseStream.Write(buffer, 0, numRead) fileLength -= numRead End While fs.Close() baseStream.Close() irClient.Close() StatusBar1.Text = "File sent" End Sub ' Receives a file. Private Sub Receive_Click(sender As Object, e As System.EventArgs) _ Handles Receive.Click ' Create a stream for writing the file. Dim writeStream As Stream Try writeStream = New FileStream(fileReceive, FileMode.OpenOrCreate) Catch MessageBox.Show("Couldn't open " & fileReceive & " for writing") Return End Try ' Create a connection, with the IrDAEndPoint class, ' for the selected device in the list box. ' Start listening for incoming requests from ' that device with an IrDAListener object. Try Dim i As Integer = ListBox1.SelectedIndex irEndP = New IrDAEndPoint(irDevices(i).DeviceID, irServiceName) irListen = New IrDAListener(irEndP) irListen.Start() Catch exSoc As SocketException MessageBox.Show("Couldn't listen on service " & irServiceName & ": " _ & exSoc.ErrorCode) End Try ' Show listening for selected device. StatusBar1.Text = "Listening for " & ListBox1.SelectedItem.ToString() ' Create a client connection for the ' service detected by the listener. Dim irClient As IrDAClient Try irClient = irListen.AcceptIrDAClient() Catch exp As SocketException MessageBox.Show("Couldn't accept socket " & exp.ErrorCode) Return End Try ' Show whether a transfer from ' the remote device is pending. If irListen.Pending() = True Then StatusBar1.Text = "Pending from " & irClient.RemoteMachineName Else StatusBar1.Text = "Not pending from " & irClient.RemoteMachineName End If ' Get the underlying stream of the client. Dim baseStream As Stream = irClient.GetStream() Dim numToRead As Integer 'Create a buffer for reading the file. Dim buffer(buffersize) As Byte ' Read the stream of data, which contains ' the data from the remote device, until ' there are no more bytes to read. numToRead = 4 While numToRead > 0 Dim numRead As Integer = baseStream.Read(buffer, 0, numToRead) numToRead -= numRead End While ' Get the size of the buffer to show ' the number of bytes to write to the file. numToRead = BitConverter.ToInt32(buffer, 0) StatusBar1.Text = "Going to write " & numToRead & " bytes" ' Write the stream to the file until ' there are no more bytes to read. While numToRead > 0 Dim numRead As Integer = baseStream.Read(buffer, 0, buffer.Length) numToRead -= numRead writeStream.Write(buffer, 0, numRead) End While ' Show that the file was received. StatusBar1.Text = "File received" baseStream.Close() writeStream.Close() irListen.Stop() irClient.Close() End Sub End Class
Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC
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.