Kbase P180157: Application using .NET SerialPort class hangs when displaying message box
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
27/01/2011 |
|
Status: Unverified
SYMPTOM(s):
Application using .NET SerialPort class hangs when displaying message box
Similar behavior in applications using timer controls.
FACT(s) (Environment):
Using System.IO.Ports.SerialPort class from the Microsoft .NET framework.
SerialPort.DataReceived event handler contains MESSAGE ... VIEW-AS ALERT-BOX statement.
Windows
OpenEdge 10.2x
OpenEdge Category: Language (4GL/ABL)
CAUSE:
This is expected behavior. OpenEdge does not support multi-threading. System.IO.Ports.SerialPort is a multi-threaded control. Displaying a message while processing the DataReceived event is not expected to work because the DataReceived event comes in on a second thread, but the message box is displayed on the original thread with the UI, causing the hang.
FIX:
None at this time.