OnWebSocketMessage
This method must not be called by the user. Instead, you can derive from the function block FB_IotWebSocketsClient and override this method. While the Execute() method is called, the responsible TwinCAT driver can call the OnWebSocketMessage() method in the event of new incoming messages. In the event of several incoming messages the callback method is called several times, once per message. This must be taken into account when the method is implemented.
METHOD OnWebSocketMessage: HRESULT
VAR_INPUT
content : PVOID;
contentLength : UDINT;
contentType : ETcIotWebSocketContentType;
END_VAR
Return value
Name | Type | Description |
|---|---|---|
OnWebSocketMessage | HRESULT | The return value of the method should be S_OK, if the message was accepted. If the message is to be issued again in the context of the next Execute() call, the return value can be assigned S_FALSE. |
Inputs
Name | Type | Description |
|---|---|---|
content | PVOID | Pointer to the content. |
contentLength | UDINT | Size of the content in bytes. |
contentType | ETcIotWebSocketContentType | Specifies whether the content is binary or text. |