matlab - Matlab中另一个函数中一个函数的访问变量

Question

我想在 matlab GUI 中的另一个函数中访问一个函数中变量的值。例如

    % --- Executes on button press in browseCoverHide.
function browseCoverHide_Callback(hObject, eventdata, handles)
  % hObject    handle to browseCoverHide (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    structure with handles and user data (see GUIDATA)
[File,Path] = uigetfile('*.png','Select Image');
path = strcat(Path,File);
global covImg
covImg = imread(path);
axes(handles.axes1);
imshow(covImg);

     % --- Executes on button press in browseSecImg.
function browseSecImg_Callback(hObject, eventdata, handles)
  % hObject    handle to browseSecImg (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    structure with handles and user data (see GUIDATA)
global covImg
axes(handles.axes3);
imshow(covImg);

在这里我想从中访问，CovImg但它不起作用。function browseSecImg_Callbackfunction browseCoverHide_Callback

Answer 1

您不必使用全局变量。handles您可以使用变量传输数据，这是 的标准方法GUIDE。

% --- Executes on button press in browseCoverHide.
function browseCoverHide_Callback(hObject, eventdata, handles)
  % hObject    handle to browseCoverHide (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    structure with handles and user data (see GUIDATA)
[File,Path] = uigetfile('*.png','Select Image');
path = strcat(Path,File);
handles.covImg = imread(path);
axes(handles.axes1);
imshow(handles.covImg);
guidata(hObject,handles);

     % --- Executes on button press in browseSecImg.
function browseSecImg_Callback(hObject, eventdata, handles)
  % hObject    handle to browseSecImg (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    structure with handles and user data (see GUIDATA)
axes(handles.axes3);
imshow(handles.covImg);