Why do frequent calls to lv_obj_add_style() cause the system to crash?

How-to
1

I have a requirement to change the font of the label frequently, so I will frequently use lv_obj_add_style() to change its display font. My frequent calls to lv_obj_add_style() on the lvgl emulator also cause the program to crash and exit. How can I solve this problem?

2

Hi @zytao ,

If you repeatedly call lv_obj_add_style() you will leak memory at a high rate.

I would suggest using the ‘local styles’ for this type of application, lv_obj_set_style_xxxxx(), these functions operate directly on the objects concerned modifying the objects internal style memory rather than allocating a new style each time if that makes sense? Here is a link to the small section in the documentation about this, at the bottom of the page there is a list of all the functions you call of this type.

So to change the font of your label I would do something like this:

lv_obj_set_style_text_font( your_frequently_changing_label, &your_font, LV_PART_MAIN );

I hope that helps.

Kind Regards,

Pete

3

Ok, I’ll give it a try.

4

The cause of the breakdown was shown at that time: Segmentation fault

5

Thank you very much for your advice. My problem has been solved.

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