Deleting LISTBOX gets an error message from emWin ErrorOut

kenmux · Jun 28th 2018, 8:00am

Today I set GUI_DEBUG_LEVEL as 3, and implement the function GUI_X_ErrorOut().

And I found calling WM_DeleteWindow(_hListbox) causes an error message:

GUI_Alloc.c:Block to be deleted is already locked in _Free().

Why this came out? Any ideas?
By the way, I used LISTBOX_SetOwnerDraw().

kenmux · Jun 29th 2018, 7:15am

Update: the error message is gone if not calling LISTBOX_EnableWrapMode().

But actually it is needed.
So, what should I do to eliminate this error?
My emWin version is: v5.44b, using FreeRTOS.

kenmux · Aug 8th 2018, 3:12am

I implemented list-wrap by myself at last.
I cannot find a better way to solve this problem.
Appreciate any solutions.

SEGGER - Schoenen · Aug 8th 2018, 2:10pm

Hi,

I was able to reproduce this with version 5.44b. With the current version 5.48 it is solved.

Since you got the source code of emWin you can simply add the line below into the function body of LISTBOX_EnableWrapMode() right before the call of GUI_UNLOCK().

Add this:
GUI_UNLOCK_H(pObj);

Regards,
Sven

kenmux · Aug 13th 2018, 5:11am

Hello Sven,

Awesome! Thanks for your reply!

Deleting LISTBOX gets an error message from emWin ErrorOut

Deleting LISTBOX gets an error message from emWin ErrorOut

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