我正在创建一个用户输入值的GUI,当他按下按钮时,它会运行外部函数并显示错误消息。我在GUI编码中成功插入变量时遇到问题。我很困惑在哪里插入我的变量。我试过手柄,但不幸的是它没有用。
% --- Executes just before Stallfunction is made visible.
function Stallfunction_OpeningFcn(hObject, ~, 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 Stallfunction (see VARARGIN)
% Choose default command line output for Stallfunction
handles.user_entry = user_entry;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes Stallfunction wait for user response (see UIRESUME)
% uiwait(handles.figure1);
我在上面的代码中插入了变量,'user_entry'是正确的吗?
答案 0 :(得分:1)
user_entry
未在您的函数中分配值。如果您通过传递user_entry
的值来启动GUI:
Stallfunction(user_entry)
然后您在opensFcn中的代码的第一行应该是:
if ~isempty(varargin)
user_entry = varargin{1};
else
error('please start the GUI with an input value')
end
在此之后,您可以将user_entry
分配给句柄结构。
答案 1 :(得分:0)
试试这个:
function num = get_num()
fig = figure('Units', 'characters', ...
'Position', [70 20 30 5], ...
'CloseRequestFcn', @close_Callback);
edit_num = uicontrol(...
'Parent', fig, ...
'Style', 'edit', ...
'Units', 'characters', ...
'Position', [1 1 10 3], ...
'HorizontalAlignment', 'left', ...
'String', 'init', ...
'Callback', @edit_num_Callback);
button_finish = uicontrol( ...
'Parent', fig, ...
'Tag', 'button_finish', ...
'Style', 'pushbutton', ...
'Units', 'characters', ...
'Position', [15 1 10 3], ...
'String', 'Finish', ...
'Callback', @button_finish_Callback);
% Nested functions
function edit_num_Callback(hObject,eventdata)
disp('this is a callback for edit box');
end
function button_finish_Callback(hObject,eventdata)
% Exit
close(fig);
end
function close_Callback(hObject,eventdata)
num_prelim = str2num(get(edit_num,'string'));
if(isempty(num_prelim))
errordlg('Must be a number.','Error','modal');
return;
end
num = num_prelim;
delete(fig);
end
waitfor(fig);
end
看看你是否可以搞砸了这个并得到你想要的东西。另外,学习使用嵌套函数以及回调在matlab中的工作方式。将其保存为函数文件,然后调用“num = getnum;”