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Description
I have a function which create for me a label “My_GUI__Label(…)”,
i pass every parameters of my requested label to it, but when user_data ckecked inside the function is correct but outside of function when accesse using
child = lv_obj_get_child(lv_scr_act(), i); user_strR = (char*)lv_obj_get_user_data(child);
the user_data of all objects or some of them THAT created with “My_GUI__Label(…)” goes wrong,
can somebody tell me how i write/access to “My_GUI__Label(…)”,
AND what is going wrong there?!?!
What MCU/Processor/Board and compiler are you using?
Visual Studio 2022 simulator
What LVGL version are you using?
LVGL Ver: 8.3.0 dev
What do you want to achieve?
creating some LVGL object and write/read to USER DATA part from anywhere.
What have you tried so far?
Tried many ways with any success.
Code to reproduce
Add a code snippet which can run in the simulator. It should contain only the relevant code that compiles without errors when separated from your main code base.
The code block(s) should be formatted like:
/*You code here*/
/************************************************************************************************
*
* Label Creater
*
*/
lv_obj_t* My_GUI__Label(char* _text, char* _id_strR, lv_obj_t* _parent,
lv_align_t _Align, uint16_t _X, uint16_t _Y,
int width, int height
)
{
lv_obj_t* label = lv_label_create(_parent);
lv_label_set_text(label, _text);
lv_obj_set_pos(label, 700, 100);
printf("\nMy_GUI__Label _id_strR String is: %s", _id_strR);
lv_obj_set_user_data(label, (char*) _id_strR);
return label;
}
/************************************************************************************************
*
* Test function to use Label Creater
*
*/
void My_GUI_test_XX(void)
{
int int_desX = 700;
int int_desY = 50;
int int_width = 20;
int int_height = 50;
char text_strR[] = "My_GUI_test";
char append_STR[] = "My_GUI_test DATA0000000";
char append_STR1[] = "My_GUI_test DATA1111111";
char append_STR2[] = "My_GUI_test DATA2222222";
char append_STR3[] = "My_GUI_test DATA3333333";
lv_obj_t* lbl1 = My_GUI__Label(text_strR, append_STR, lv_scr_act(),
NULL, int_desX, int_desY //NULL set position 20,20
// LV_ALIGN_CENTER, 150, -40 //center align
, int_width, int_height
);
lbl1 = My_GUI__Label(text_strR, append_STR1, lv_scr_act(),
NULL, int_desX + 50, int_desY + 50 //NULL set position 20,20
// LV_ALIGN_CENTER, 150, -40 //center align
, int_width, int_height
);
lbl1 = My_GUI__Label(text_strR, append_STR2, lv_scr_act(),
NULL, int_desX + 50, int_desY + 50 //NULL set position 20,20
// LV_ALIGN_CENTER, 150, -40 //center align
, int_width, int_height
);
lbl1 = My_GUI__Label(text_strR, append_STR3, lv_scr_act(),
NULL, int_desX + 50, int_desY + 50 //NULL set position 20,20
// LV_ALIGN_CENTER, 150, -40 //center align
, int_width, int_height
);
lv_obj_t* label = lv_label_create(lv_scr_act());
lv_label_set_text(label, "My_GUI_test_TRADITIONAL");
lv_obj_set_pos(label, 700, 100);
lv_obj_set_user_data(label, (void*)"User_Data_My_GUI_test_TRADITIONAL");
//append_STR = (char*)lv_obj_get_user_data(label);
//printf("\n++Direct Read______USER data is: %s", append_STR);
}
/************************************************************************************************
*
* sample Traditional labels
*
*/
void Traditional_testGUI(void)
{
lv_obj_t* button;
lv_obj_t* label;
char* got_user_data = NULL;;
const char* text_strR = NULL;
label = lv_label_create(lv_scr_act());
lv_label_set_text(label, "label0");
lv_obj_set_pos(label, 10, 100);
lv_obj_set_user_data(label, (void*)"TRADITIONAL Data_0");
got_user_data = (char*)lv_obj_get_user_data(label);
printf("\n\n\n\tTraditional_testGUI______USER data is: %s", got_user_data);
label = lv_obj_create(lv_scr_act());
//lv_label_set_text(label, "object0");
lv_obj_set_pos(label, 10, 300);
lv_obj_set_user_data(label, (void*)"TRADITIONAL Data_1");
got_user_data = (char*)lv_obj_get_user_data(label);
printf("\n\tTraditional_testGUI______USER data is: %s", got_user_data);//------------------------
label = lv_label_create(lv_scr_act());
lv_label_set_text(label, "label1");
lv_obj_set_pos(label, 100, 100);
lv_obj_set_user_data(label, (void*)"TRADITIONAL Data_2");
got_user_data = (char*)lv_obj_get_user_data(label);
printf("\n\tTraditional_testGUI______USER data is: %s", got_user_data);
label = lv_label_create(lv_scr_act());
lv_label_set_text(label, "label2");
lv_obj_set_pos(label, 180, 100);
lv_obj_set_user_data(label, (void*)"TRADITIONAL Data_3");
got_user_data = (char*)lv_obj_get_user_data(label);
printf("\n\tTraditional_testGUI______USER data is: %s", got_user_data);
printf("\n\n");
}
/************************************************************************************************
*
*
*
*/
int main()
{
lv_init();
printf("\n\n----------------------------------");
printf("\n*** LVGL Ver: %i.%i.%i %s ***", LVGL_VERSION_MAJOR, LVGL_VERSION_MINOR, LVGL_VERSION_PATCH, LVGL_VERSION_INFO);
printf("\n----------------------------------\n\n");
Traditional_testGUI();
char* user_strR = NULL;
printf("\n\n\n----------------- child = lv_obj_get_child(lv_scr_act(), i) -----------------");
lv_obj_t* child;
for (int i = 0; i < lv_obj_get_child_cnt(lv_scr_act()); i++) {
child = lv_obj_get_child(lv_scr_act(), i);
user_strR = (char*)lv_obj_get_user_data(child);
if (user_strR != NULL)
printf("\n++Child find USER data is i: %i %s", i, user_strR);
}
}
Screenshot and/or video
Another try
If possible, add screenshots and/or videos about the current state.
