Error(s) callback uicontrol in a function

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83quarks 2019-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/447103-error-s-callback-uicontrol-in-a-function

评论： Jan 2019-2-27

Hello,

i have one or more problems by getting values from a listboy back to main function. if its running as a script it worked.

I'm not using GUIDE oder app-builder and a beginner

There is one proplem by evaluating the callback if the main-program is a function, as shown in the following code-example:

[] = function f_Auswahlliste_GUI()
fh_GUI=figure;
set(fh_GUI, 'position', [50 50 [220 120]*8]);
RPLT.Auswahlelemente = {'TOP 1';'TOP2';'TOP3'};
h.h_list_text = uicontrol('Style','Text','Position',[20 900 150 20],'String','xxxx auswählen');
h.h_list = uicontrol('style','list','Value',[],'max',length(RPLT.Auswahlelemente),...
    'min',1,'Position',[20 200 150 680],...
    'string',RPLT.Auswahlelemente,'Callback','Select = f_Auswahlliste(h.h_list)');
% '[Select] = @f_Auswahlliste(h.h_List)'
% 'Select = f_Auswahlliste(h.h_list)'
h.h_pb = uicontrol('Style', 'pushbutton', 'String', 'Get & Close',...
    'Position', [1150 20 80 30],...
    'Callback', @cla);
uiwait(fh_GUI);
end
function output = f_Auswahlliste(Liste)
index=get(Liste,'Value');
list = get(Liste,'String');
output = {list{index}};
end
function cla(h,event)
uiresume(gcbf); % Return to main program after Selection
close;
end

Could somebody help me?

Thanks

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Jan 2019-2-26

编辑：Jan 2019-2-26

在 MATLAB Online 中打开

This is not valid Matlab syntax:

[] = function f_Auswahlliste_GUI()

I guess, tha "[] = " is a typo. Please remove it.

You did not mention, what the problem is and what you want to achieve. "getting values from a listboy back" is not clear enough.

It is a bad idea to define a callback as string. This was outdated over 12 years ago and is only supported for backward compatibility:

'Callback', 'Select = f_Auswahlliste(h.h_list)'

I cannot guess, where you want the output Select to appear.

Do not redefine the builtin function cla.

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Answer 1

83quarks 2019-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/447103-error-s-callback-uicontrol-in-a-function#answer_362952

Hello again,

ok i don't need a callback.

Now this is the code i want to have and which one is working as i want:

Thank you!

function [Select,fh_GUI,h] = f_Auswahlliste_GUI_v02()
fh_GUI=figure;
set(fh_GUI, 'position', [50 50 [220 120]*8]);
RPLT.Auswahlelemente1 = {'TOP1'; 'TOP2'; 'TOP3'};
RPLT.Auswahlelemente2 = {'TOPF6'; 'TOPF7'; 'TOPF8'};
%% Listbox-Elemente
h.h_list1_text = uicontrol('Style','Text','Position',[20 900 150 20],'String','xxxx1 auswählen','Visible','on');
h.h_list1 = uicontrol('style','list','Value',[],'max',length(RPLT.Auswahlelemente1),...
    'min',1,'Position',[20 200 150 680],'Visible','on',...
    'string',RPLT.Auswahlelemente1);
h.h_list2_text = uicontrol('Style','Text','Position',[320 900 150 20],'String','xxxx1 auswählen','Visible','on');
h.h_list2 = uicontrol('style','list','Value',[],'max',length(RPLT.Auswahlelemente2),...
    'min',1,'Position',[320 200 150 680],'Visible','on',...
    'string',RPLT.Auswahlelemente2);
uicontrol('Style', 'pushbutton', 'String', 'Get & Close',...
    'Position', [1150 20 80 30],...
    'Callback', {@closefig, fh_GUI});
uiwait(fh_GUI); 
Select.List1 = f_Auswahllisteintern(h.h_list1);
Select.List2 = f_Auswahllisteintern(h.h_list2);
close(fh_GUI); 
end
function output = f_Auswahllisteintern(Liste)
index  = get(Liste, 'Value');
list   = get(Liste, 'String');
output = list(index);
end
function closefig(buttonh,event,fh_GUI)
uiresume(fh_GUI); % Return to main program after Selection
end

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Jan 2019-2-27

By the way, until R2007b Matlab had the function popupstr, which could replace your f_Auswahllisteintern. You can find a replacement for this useful, but tiny function here: FEX: GetSelection

Replying fh_GUI and h is dangerous, becahsue you have closed the figure already, such that all handles are invalid. Then there is no reason to reply them as output.

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Answer 2

Jan 2019-2-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/447103-error-s-callback-uicontrol-in-a-function#answer_362836

编辑：Jan 2019-2-26

在 MATLAB Online 中打开

With some bold guessing:

function output = f_Auswahlliste_GUI()
fh_GUI = figure('position', [50 50 [220 120]*8]);
RPLT.Auswahlelemente = {'TOP 1'; 'TOP2'; 'TOP3'};
h.h_list_text = uicontrol('Style', 'Text', ...
    'Position', [20 900 150 20], ...
    'String',   'xxxx auswählen');
h.h_list = uicontrol('style', 'listbox', ...
    'Value', [], 'max', numel(RPLT.Auswahlelemente), 'min', 1, ...
    'Position', [20 200 150 680],...
    'string',   RPLT.Auswahlelemente);
h.h_pb = uicontrol('Style', 'pushbutton', 'String', 'Get & Close',...
    'Position', [1150 20 80 30],...
    'Callback', {@myCallback, fh_GUI});
uiwait(fh_GUI);
index  = get(h.h_list, 'Value');
list   = get(h.h_list, 'String');
output = list(index);
close(fh_GUI);
end
function myCallback(ButtonH, Event, fh_GUI)
uiresume(fh_GUI);
end

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Jan 2019-2-26

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[MOVED from section for answers] (please post comments in the section for comments)

83quarks wrote:

Thanks for the button callback correction.

Sorry I tried to extract my code in an example - so its may be not looking so clear - could you understand the following problem:

The problem ist i have lots of lists an want the extraction of the Listbox-Values in an internal or external function:

output = f_Auswahlliste(inputlist)
index=get(Liste,'Value');
list = get(Liste,'String');
output = {list{index}};

But how must the callback of every listbox look like ??

h.h_list = uicontrol('style','list','Value',[],'max',length(RPLT.Auswahlelemente),...
    'min',1,'Position',[20 200 150 680],...
    'string',RPLT.Auswahlelemente,'Callback',???'want to call the "Select.values = f_Auswahlliste(..)"');
h.h_list2 .....
    ....

Jan 2019-2-26

编辑：Jan 2019-2-26

在 MATLAB Online 中打开

You did not mention yet, why you need a callback for the listbox. As far as I can guess, you want to open a figure, display a listbox, select some of its elements and press a button to finish the selction. This is done by my suggested code already. Therefore I do not know, what the callback of the listbox should do. "want to call the "Select.values = f_Auswahlliste(..)"" is not clear.

You can implement a callback by e.g.:

h.h_list = uicontrol('style','list','Value',[],'max',length(RPLT.Auswahlelemente),...
    'min',1,'Position',[20 200 150 680],...
    'string', RPLT.Auswahlelemente, ...
    'Callback', @listCallback);
...
function listCallback(ListH, Event)
Value = get(ListH, 'Value');
Str   = get(ListH, 'String');
Selected = Str(Value)
end

But there is nothing to do here. Better wait until the button was pressed and determine the selected strings afterwards to reply them as output of the GUI. This works with multiple listboxes also.

I have included this code in the GUI already:

index  = get(h.h_list, 'Value');
list   = get(h.h_list, 'String');
output = list(index);  % more efficient than {list{index}}

so there is no need to call "an internal or external function".

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Error(s) callback uicontrol in a function

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