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Stored procedures
WLanguage procedure called by WebSocketClientConnect
WLanguage procedure ("callback") called by WebSocketClientConnect when the connection to the server is established.
This procedure is called in the following cases:
  • when the connection to the server is established,
  • when data is received,
  • when the socket is closed,
  • when an error occurs.
CAUTION : the procedure is called in the application's main thread:
  • You can access UI controls from the procedure.
  • The process should not be too long, since this could block the user.
Example
WebSocketClientConnect("client", WebSocketClientConnect_Callback, "myserver.com")
 
INTERNAL PROCEDURE WebSocketClientConnect_Callback(nEvent, sMessage)
SWITCH nEvent
CASE SocketOpening
SocketWrite("client", "Send message from the browser.")
 
CASE SocketMessage
Info("Server message received: " + sMessage)
 
CASE SocketClosing
Info("Socket closed", sMessage)
 
CASE SocketError
Error("Socket error")
END
END
Syntax
WebSocketClientConnect_Callback(<Event> , <Message>)
<Event>: Integer constant
Corresponds to one of the following constants:
SocketClosingThe socket is closed. The <Message> parameter contains a code that indicates the reason for closing.
SocketErrorAn error occurred during the communication with the server. The <Message> parameter is always empty.
SocketMessageThe socket received a message. The <Message> parameter contains data relative to the message.
SocketOpeningThe socket is connected to the server. You have the ability to send messages.
<Message>: Character string
Response from the server according to the <Event>.
Component: wd300com.dll
Minimum version required
  • Version 27
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Last update: 05/26/2022

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