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Returning values in a GUI Callback

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Rick
Rick 2012-4-23
How do you return a value from the callback routine(File_Select_Callback), back up to the calling routine (Selection), In the following example,
What I want is the directory path from the* uigetfile* function back up to the calling funtion.
function Selection
Input_Select = uicontrol('Style','pushbutton','String','
Select Inoput File', 'Position', [300 50 100 25],
'Callback'...,{@File_Select_Callback});
end
*function File_Select_Callback* (hObject,eventdata)
[filename,Path] = *uigetfile*('*.*','Select the File', 'MultiSelect','on');
end

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回答（2 个）

Sean de Wolski
Sean de Wolski 2012-4-23
most Callbacks do not return output arguments. What it looks like you want it for the UICONTROL, upon being pushed, to return stuff. This will not work. Instead once you get the filename and path, store these to application data (setappdata/getappdata) or to the field of another uicontrol (perhaps a static text box). You can then access these from elsewhere.
  2 个评论
Walter Roberson
Walter Roberson 2012-4-23
*Most* callbacks. zoom ButtonDownFilter is an example of something that is designated a callback but returns a value.

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Walter Roberson
Walter Roberson 2012-4-23
It is not possible to return a value from most callbacks; you can only return a value from filter functions such as the zoom ButtonDownFilter.
See http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

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