I am using setappdata() and getappdata() in my code and I'm getting this error. PLz help me out, how to remove this error? what will be the correct code?

Question

Prashant 2014-4-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126371-i-am-using-setappdata-and-getappdata-in-my-code-and-i-m-getting-this-error-plz-help-me-out-how

回答： Image Analyst 2014-4-19

function varargout = Trial(varargin) % TRIAL M-file for Trial.fig % TRIAL, by itself, creates a new TRIAL or raises the existing % singleton*. % % H = TRIAL returns the handle to a new TRIAL or the handle to % the existing singleton*. % % TRIAL('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in TRIAL.M with the given input arguments. % % TRIAL('Property','Value',...) creates a new TRIAL or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before Trial_OpeningFcn gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to Trial_OpeningFcn via varargin. % % *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one % instance to run (singleton)". % % See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help Trial

% Last Modified by GUIDE v2.5 26-Mar-2014 15:02:25

% Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @Trial_OpeningFcn, ... 'gui_OutputFcn', @Trial_OutputFcn, ... 'gui_LayoutFcn', [] , ... 'gui_Callback', []); if nargin && ischar(varargin{1}) gui_State.gui_Callback = str2func(varargin{1}); end

if nargout [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:}); else gui_mainfcn(gui_State, varargin{:}); end % End initialization code - DO NOT EDIT

% --- Executes just before Trial is made visible. function Trial_OpeningFcn(hObject, eventdata, handles, varargin) % This function has no output args, see OutputFcn. % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % varargin command line arguments to Trial (see VARARGIN)

% Choose default command line output for Trial handles.output = hObject;

% Update handles structure guidata(hObject, handles);

% UIWAIT makes Trial wait for user response (see UIRESUME) % uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line. function varargout = Trial_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT); % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure varargout{1} = handles.output;

% --- Executes on button press in pushbutton1. function pushbutton1_Callback(hObject, eventdata, handles) % hObject handle to pushbutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) [filename, pathname] = uigetfile('*.jpg', 'Pick an M-file'); filename=strcat(pathname,filename); I1 = imread(filename); I1 = imshow(I1,'Parent',handles.axes1); setappdata(handles.pushbutton1,'img',I1)

% --- Executes on button press in pushbutton2. function pushbutton2_Callback(hObject, eventdata, handles) % hObject handle to pushbutton2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) rg = rgb2gray(I1); rg1 = imadjust(rg) rg1 = imshow(rg1,'Parent',handles.axes2);

--------------------------------------------------------------------------------------------

ERROR:

??? Undefined function or variable 'I1'.

Error in ==> Trial>pushbutton2_Callback at 92 rg = rgb2gray(I1);

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> Trial at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> guidemfile>@(hObject,eventdata)Trial('pushbutton2_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

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Answer 1

Image Analyst 2014-4-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126371-i-am-using-setappdata-and-getappdata-in-my-code-and-i-m-getting-this-error-plz-help-me-out-how#answer_133903

I1 was never defined in pushbutton2's callback. All variables are local unless you make them global explicitly or use functions like getappdata to pass them around. See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F