Calling a pushbutton inside a GUI

I have a fairly large program I have been working on for my masters project.

There is a pushbutton called braking that does some calculations and at the end I have this below to store the calculated values into two handles.

handles.break_dis=gdist;

handles.break_vel=gvel;

guidata(hObject,handles)

Then in a separate pushbutton called start I have

braking_Callback(hObject, [], handles);

values=handles.break_dis

If I click on the braking button then the start button it works.

If i click directly on the start button it runs the code in the braking button but when it gets to the values=handles.break_dis line it says "Reference to non-existent field 'break_dis'"

I'm not sure what is happening.

Answer 1

[Walter Roberson]

After your line

braking_Callback(hObject, [], handles);

you need to add

handles = guidata(hObject);

You got a local copy of the handles structure, so when the handles structure was updated elsewhere in the program, your local copy was not updated. You need to fetch the updated version.