Global variables in GUI
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Hi everyone, I have a problem with global variable in matlab GUI. I have a main window with options that i want to be active only after setting previous options. That options are placed in menu editor. So I have:
function PREV_OPTION_Callback(hObject, eventdata, handles)
global PREV_OPTION_set;
PREV_OPTION_menu;
if(PREV_OPTION_set)
set (handles.NEXT_OPTION,'enable','on','foregroundcolor',[0 0 0]); % next option is available
end
PREV_OPTION_set is beeing changed in PREV_OPTION_menu to value of 1. While debbuging everything is ok - PREV_OPTION_set equals to 1, but while running the program code in if scope is running since second callback function launch (after second clicking on PREV_OPTION from menu). What is wrong?
1 个评论
Adam
2017-12-19
It would be a lot easier if you just returned a relevant argument from your PREV_OPTION_menu function. These are the type of errors you get when using global variables.
回答（1 个）
Walter Roberson
2017-12-19
0 个投票
If PREV_OPTION_menu is a script that is changing PREV_OPTION_set, and if PREV_OPTION_menu does not itself use "global" in talking about the variable, then the Just In Time compiler might not notice that the variable is changed.
If PREV_OPTION_menu is a function that is changing PREV_OPTION_set and PREV_OPTION_Menu does not use "global" in talking about the variable, then as far as MATLAB is concerned the global variable is not changed.
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2017-12-19
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