How to error check if the checkbox is checked or not?

[mpwbs]

How do I error check if my checkbox is checked or not? I have three of them, I just need to figure out how to error check them if all three never get checked... I tried to do an error check with a boolean function and it still errored out even if I checked one.

So, I just realized that it seems I have a bug or something because my program also doesn't hit my callback function for the checkboxes at all. It just passes right through them.

Any help would be nice. Thanks

[RobertoBozzolo]

If it is in hot mode, a checkbox responds to EVENT_COMMIT events; inside the callback you can simply call GetCtrlVal to get the status: value is 1 if checked, 0 otherwise. 

[ebalci]

Can you paste here the block of code which reads the checkbox state? You can send the whole callback if it is not too long. 

[mpwbs]

int CVICALLBACK check_sn (int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_LEFT_CLICK:
GetCtrlVal (panelHandle, PANEL_chk_sn, &IsChecked);
sn = IsChecked;

break;
}
return sn;
}
int CVICALLBACK check_operator(int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_COMMIT:

GetCtrlVal (panelHandle, PANEL_chk_operator, &IsChecked);
operator = IsChecked;

break;
}
return operator;
}

int CVICALLBACK check_partid(int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_COMMIT:

GetCtrlVal (panelHandle, PANEL_chk_partid, &IsChecked);
partid = IsChecked;

break;
}
return partid;
}

[ebalci · Accepted solution]

First, You shouldn't return checkbox state from the callback. Callback normally must return zero. Nonzero returns causes events to be "swallowed". 

Second, change the EVENT_LEFT_CLICK to EVENT_VAL_CHANGED. Your callback is called before the state is changed, therefore you cannot get the new value. 

[mpwbs]

So, all of them to VAL_CHANGED? I was playing around with the click event to see if that was the issue or not.

[ebalci]

If all three callbacks are belonging to checkboxes, yes, you can convert them to EVENT_VAL_CHANGED. 

Make sure you return 0 also, from those callbacks.

After you call GetCtrlVal, the recent value of the checkbox should be in the variable.