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KB84732
PAC Display Runtime: Buttons and combo boxes touching other dynamic graphics may cause a crash or odd behavior
Revision:  2.0
Published:  4/30/2015
Applies To
PAC Display Basic
PAC Display Professional
Versions
Versions affected:  
R9.0a to current
Problem is fixed in version:  
R9.5a

SYMPTOMS

If a Runtime project has several buttons or combo boxes that require constant updating, the system may run out of GDI resources causing odd GUI issues or even a Runtime crash.

Details

This only happens if buttons or combo boxes are touching or within a few pixels of each other, and a dynamically changing non-button graphic or combo box is also touching or within a few pixels of at least one of the buttons or combo boxes.

The updating graphic will force a redraw of the adjacent buttons or combo boxes, which then force a redraw of those adjacent to it, and so on.

This redrawing consumes GDI resources, which are limited on a Windows system. After several minutes or hours, the leaked GDI resources will cause the abnormal behavior.

WORKAROUND

Move the adjacent graphics so that there are about 10 pixels between each graphic.

RESOLUTION

Opto 22 has resolved this issue.

Relevant Downloads
No relevant downloads have been specified.
Questions? Contact Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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This Opto 22 Knowledge Base ('OptoKB') article is intended to provide general technical information on a particular subject or subjects and is not an exhaustive treatment of such subjects. Accordingly, the information in this OptoKB article is not intended to constitute application, design, software, or other professional engineering advice or services. Opto 22 may modify the OptoKB articles at any time. Before making any decision or taking any action which might affect your equipment, you should consult a qualified professional.

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