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Code example - VB - How to communicate with a smart camera over an Ethernet TCP/IP socket


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For the full project see the attachment. Below is a step by step description using Visual Basic:

1. Import the following libraries:

Imports System.Net.Sockets

Imports System.Text

2. Define the following variables which are used in the code lines later:

Dim ClientSocket As New TcpClient

Dim ServerStream As NetworkStream

Dim ServerAddress As String = "192.168.0.100"

Dim PortNumber As Integer = 49211

Dim ReceivedData As String

Dim inStream(10024) As Byte

3. Connect to camera:

ClientSocket.Connect(ServerAddress, PortNumber)

4. Send data:

Dim OutStream As Byte() = _

System.Text.Encoding.ASCII.GetBytes("jobinfo\r\n")

ServerStream.Write(OutStream, 0, OutStream.Length)

ServerStream.Flush()

5. Receive data:
To receive data from the camera in a safe way (without losing data), we need to listen to the socket continuously on a separate thread. The thread function will use a while loop in the following way:

While 1

ServerStream.Read(inStream, 0, CInt(ClientSocket.ReceiveBufferSize))

ReceivedData = Encoding.ASCII.GetString(inStream)

txtShow()

End While

*The function txtShow() is a local service routine to display the data.

Operating System

Any

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