MATLAB: Showing Alert of empty axes box.

axesImage Processing Toolbox

When the Axes Box does not contain any image and user clicks on the Push button then an error should popup saying "Please upload an image" or something else, how to do that how check whether the axes box is empty or not?

Best Answer

Set the 'enable' property of the Extract button to 'off' at the start of the program. When the user has uploaded or captured an image, set the enable property to 'on'. That way it is not possible for the Extract button to be clicked when there is no image to extract from.

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MATLAB: H i every one , i need to declare a counter such that if any one of the four buttons is pressed a specefic funtion specified in the fifth button is performed.Suppose UserData can not be used it reserved for something else

Use guidata, which calls setappdata and getappdata internally:

function pushbutton1_Callback(hObject, eventdata, handles)
handles = guidata(hObject);
handles.counter = 1;
guidata(hObject, handles);
% And the same for the other callbacks...
function pushbutton5_Callback(hObject, eventdata, handles)
handles = guidata(hObject);
switch handles.counter
  case 1
  case 2
  case 3
  case 4
  otherwise  % No SWITCH without OTHERWISE
    error('Programming error')
  end
end

MATLAB: How to use callback from GUI

mediumbtn_Callback(hObject, eventdata, handles)

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Related Solutions

MATLAB: H i every one , i need to declare a counter such that if any one of the four buttons is pressed a specefic funtion specified in the fifth button is performed.Suppose UserData can not be used it reserved for something else

MATLAB: How to use callback from GUI

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