Error Setting Text

Bug (archived)
1

Hi Team,
when i try to set text from other function Getting Error for both lv_arc_set_value(); and lv_arc_set_text();
Error: lv_label_set_text (lv_label.c #182 lv_label_set_text())
Error: NULL pointer (0x00000000) (lv_debug.c #127 lv_debug_log_error())

Code

int handleDimmerLevelMessage(char *message){
    printf("### Message Arrived From Dimmer[level]: %s",message);
    int value;
    sscanf(message,"%d",&value);
    printf("###Printing Value:%d",value);
    lv_arc_set_value(dimmer,value);
    lv_label_set_text(level,message);
    return 0;
}

And this error not occurring all the time. sometimes this lv_arc_set_value(); and lv_arc_set_text(); working fine.

Can you please help me with this. why this error coming?

Thanks in Advance.

2

Print out the values of dimmer and level to make sure they’re never null when the crash happens.

3

They are not null i am getting values for both dimmer and level
when i set values to arc or text getting error

4

Assuming message is not null my only guess would be memory corruption.

5

Can you use a debugger to see where it halts?

6

Hi kisvegabor,
Please find the error below
Error: lv_label_set_text (lv_label.c #182 lv_label_set_text())
Error: NULL pointer (0x00000000) (lv_debug.c #127 lv_debug_log_error())

this lv_label_set_text and lv_arc_set_text sometimes working fine.

7

Please use a debugger to find the exact spot where the NULL pointer is detected.

8

HI Team,
this showing error at lv_label_set_text()

still don’t know why this issue not coming all the time.
some times its working fine and some times its not working

and i tried to set text manually i.e lv_label_set_text(name,“Office”); and lv_arc_set_value(arc,75);. this function also showing null pointer errors sometimes

9

I think you will need to do some more debugging to find the issue; we don’t really have enough information to help you further.