如何从 GUI 中的编辑框中检索数据

Posted 2023-04-14

【中文标题】如何从 GUI 中的编辑框中检索数据

【英文标题】：How to retrieve data from an editbox in a GUI

【发布时间】：2013-03-11 21:00:53

【问题描述】：

我的 GUI 中有一个编辑框。用户在编辑框中输入一个数字，然后按下按钮。当按下按钮时，调用外部函数。对于外部函数，我需要在编辑框中输入的数字。如何使用“句柄”检索编辑框中的数据输入？

这是我打开函数的代码

% --- Executes just before NEWSTALLGUI is made visible.
function NEWSTALLGUI_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 NEWSTALLGUI (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);
set(handles.EnterSpeed,'string','0');

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

这是我的编辑框的代码

function EnterSpeed_Callback(hObject, eventdata, handles)
% hObject    handle to EnterSpeed (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of EnterSpeed as text
%        str2double(get(hObject,'String')) returns contents of EnterSpeed as a double
user_speed=str2double(get(handles.EnterSpeed,'string'));

这是我的按钮的代码

% --- Executes on button press in Calculate.
function Calculate_Callback(hObject, eventdata, handles)
% hObject    handle to Calculate (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
Newfunction(user_speed);

【参考方案1】：

看看这个：Problems with GUI, unable to use handles to store variables

基本上使用： editnum = get(editbox_handle,'string');

那么您可能希望将其转换为数字。

编辑：

function NEWSTALLGUI_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 NEWSTALLGUI (see VARARGIN)

% Choose default command line output for NEWSTALLGUI
handles.output = hObject;
handles.user_speed = 0;


% Update handles structure
guidata(hObject, handles);
set(handles.EnterSpeed,'string','0');

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

-

function EnterSpeed_Callback(hObject, eventdata, handles)
% hObject    handle to EnterSpeed (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of EnterSpeed as text
%        str2double(get(hObject,'String')) returns contents of EnterSpeed as a double
handles.user_speed=str2double(get(handles.EnterSpeed,'string'));

-

function Calculate_Callback(hObject, eventdata, handles)
% hObject    handle to Calculate (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
Newfunction(handles.user_speed);

-

我认为您也可以使用：

Newfunction(str2double(get(handles.EnterSpeed,'string')));

但不管你的船是什么。此外，在调用 Newfunction 之前，您还应该检查输入是否也是数字...在除数字之外的其他内容上使用 str2double 将返回“[]”。

【讨论】：

我已经使用了这个 user_speed=str2double(get(handles.EnterSpeed,'string') 但我仍然收到错误消息。我在打开函数之前将其定义为 0跨度>

在开启函数时使用setappdata(figurehandle,'user_speed',user_speed)。在按钮回调期间，使用 getappdata(figurehandle,'user_speed')。此外，在编辑框回调期间使用 setappdata 来更新 user_speed。如果您发布一些代码会更有帮助。

您需要一种在回调之间传递信息的方法。对于 EnterSpeed_Callback 使用：handles.user_speed = str2double(...)。然后对于 Calculate_Callback 使用：Newfunction(handles.user_speed)。还要确保在打开函数中初始化handles.user_speed = 0。让我知道这个是否奏效。您正在使用 GUIDE，所以我正在按照我记得的内容来做这件事。检查我编辑的答案。