popupMenu call with direct-initialized dyn_string causes unresponsive UI with max CPU

[ChristianGoehring]

A call to popupMenu with the text-parameter being directly initialized beforehand instead of declaration and then assignment of the value causes the UI Manager to hang and the process go to max CPU (or rather max-thread-CPU).

I am using WinCC 3.15 P05 on Win 7. You can recreate the behaviour by creating a panel and within the RightMousePressed event define the following:

Code: Select all

main(mapping event)
{
  const dyn_string txt = makeDynString("PUSH_BUTTON, text1, 1, 1");
  int answer;
  popupMenu(txt, answer);     
}

When you right-click within the panel the outline of the poup menu shows up and the UI becomes unresponsive. Within the task manager, you can find that the process reaches max CPU (which might be an endless loop, but this is just an assumption). You have to kill this process to end the UI.

However, the following code works perfectly:

Code: Select all

main(mapping event)
{
  dyn_string txt;
  txt = makeDynString("PUSH_BUTTON, text1, 1, 1");
  int answer;
  popupMenu(txt, answer);     
} 

The behaviour is the same whether in QuickTest mode or via UI manager.

[schneebergera]

Hello,
within actual version of WinCC_OA 3.15 I couldn't reproduce the described behavior.
with best regards,
Andreas

[nmnogueira]

Christian, have you tried removing the "const" from the initialization?

[schneebergera]

Hello,
it seems that there is a problem in WinCC_OA 3.15 P006.
An internal task was created and delegated to development.

best regards,
Andreas

[ChristianGoehring]

@Nuno
Yes, I tried without the const and it showed the same behaviour.

@Andreas
Okay, thank you.

[schneebergera]

Hello,

it seems to be a problem according a "fade effect", which is handled by operating system (Win7, Win10) settings.
As a workaround, please change system settings in windows.

[Systemsteuerung\\System und Sicherheit\\System - Erweiterte Systemeinstellungen]
[Systemeigenschaften] - Erweitert - Leistung (Visuelle Effekte, Prozessorzeitplanung, Speichernutzung und virtueller Speicher)
Auswahl aufheben:
de: "Menüs in Ansicht ein- oder ausblenden"
---
[Control Panel\\System and Security\\System - Advanced system settings]
[System Properties] - Advanced - Performance (Visual effects, processor scheduling, memory usage and virtual memory)
uncheck:
en: "Fade or slide menus into view"



with best regards,
Andreas