Can one cause problems by prematurely releasing a Windows GDI object? With memory one can prematurely delete/free a buffer and cause very serious problems indeed. How about GDI? Can one cause a crash or UI painting issues by prematurely releasing a GDI object?
Asked
Active
Viewed 74 times
0
-
Crash? Very, very unlikely. Painting issues? Very, very likely. – IInspectable Sep 10 '20 at 05:43
1 Answers
1
You can't delete a GDI object that is currently selected into any device context (DC): https://learn.microsoft.com/en-us/windows/win32/api/wingdi/nf-wingdi-deleteobject
After you delete an object, its handle is invalid, so you can't select it into DC.
What other scenario do you have in mind?
Vlad Feinstein
- 10,960
- 1
- 12
- 27
-
Thank you. I did not have any specific scenario in mind, I was just curious if that is a realistic danger that one must watch out for. I am debugging a 20y old program written by others, I am still learning where GDI objects are allocated and released in this program. – Radim Cernej Sep 09 '20 at 23:53