UIControl callback function problems

Question

Jon 2014-3-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123913-uicontrol-callback-function-problems

评论： Jon 2014-4-7

Ok, I'm trying out UIControl for the first time and I just want to write a program that asks a user to type something in after pressing a button and then displaying the string.

This is the script:

h = figure(1);
str = [];
h = uicontrol('Style', 'Pushbutton', 'String', 'A', 'Position', [255, 185, 50, 50], 'Callback', @push);
h = uicontrol('Style', 'Text', 'String', str, 'Position', [235, 250 ,100, 25]);

And the function:

function push(hObject, eventdata)
str = input('Enter value: ', 's');
set(h, 'String', str)
drawnow
end

It seems that the function doesn't recognise the variable 'h'. "Undefined function or variable 'h'.

"Error in push (line 3) set(h, 'String', str)

Error while evaluating uicontrol Callback" I know it's probably something trivial, but like I said, it's my first time in this area. Thanks for any help.

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Jon 2014-3-31

Can anybody help?

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Answer 1

Dishant Arora 2014-3-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123913-uicontrol-callback-function-problems#answer_131543

在 MATLAB Online 中打开

h = figure(1);
str = [];
handles.push1 = uicontrol('Style', 'Pushbutton', 'String', 'A',...
  'Position', [255, 185, 50, 50]) 
handles.text1 = uicontrol('Style', 'Text', 'String', str,...
  'Position', [235, 250 ,100, 25]);
set(handles.push1,'Callback', {@push,handles});
function push(hObject, eventdata,handles)
str = input('Enter value: ', 's');
set(handles.text1, 'String', str)
drawnow
end