MATLAB GUI 错误 Reference to non-existent field '---'

Question

我有两个编辑文本框。我想在用户点击另一个地方而不是这些编辑文本框时立即给出错误消息。我收到消息

Reference to non-existent field 'eth_xegim'.

事实上，我在这两个之前有几个编辑文本框。当我打印 S 时，我可以看到字段名打印到 xegim 但不是 xegim

S.fh = figure('Visible','on','numbertitle','off','Name','GUI',...
    'units','pixels','Position',[50 50 1500 750]);
% Panel start
S.ph_arazi = uipanel('Parent',S.fh,'Title','Arazi','TitlePosition','centertop',...
    'units','pixels','Position',[1180 364 300 244]);

S.sth_xegim = uicontrol(S.ph_arazi,'Style','text','String','x Eksenine gore egim [%]','HorizontalAlignment','left','Position',[10 68 130 18]);
% xegim edittext
S.eth_xegim = uicontrol(S.ph_arazi,'Style','edit','String','0',...
    'HorizontalAlignment','right','BackgroundColor','w',...
    'Position',[250 68 40 18],'callback',{@errmsg,S});

S.sth_yegim = uicontrol(S.ph_arazi,'Style','text',...
    'String','y Eksenine gore egim [%]','HorizontalAlignment','left',...
    'Position',[10 40 130 18]);
% xegim edittext
S.eth_yegim = uicontrol(S.ph_arazi,'Style','edit',...
    'String','0','HorizontalAlignment','right',...
    'BackgroundColor','w','Position',[250 40 40 18],...
    'callback',{@errmsg,S});
% error message
function [] = errmsg(varargin)
S = varargin{3} 

xegim = get(S.eth_xegim,'String');
xegim = xegim(ismember(xegim,'.:0123456789'));
yegim = get(S.eth_yegim,'String');
yegim = yegim(ismember(yegim,'.:0123456789'));
if isempty(xegim) || isempty(yegim)
    if length(S.fh)==1
        S.fh(2) = figure('numbertitle','off','Name','Error',...
            'menubar','none','units','pixels',...
            'Position',[700 400 200 100]);

        S.sth_error = uicontrol(S.fh(2),'Style','text',...
            'String','Girdiler sayi olmali!','Min',0,'Max',2,...
            'BackgroundColor','r','Position',[10 10 180 80]);
        ag = findobj; 
        nf = max(ag(find(ag==fix(ag))));
        if nf == 2
        close(S.fh(2))
        end
        S.fh(2) = [];
    end
    return;
end

Answer 1

当您将 S 作为附加输入参数添加到回调时 S 不包含字段 eth_xegim 和 eth_yegim，因为它们尚未添加到结构。添加字段后定义回调：

S.eth_xegim = uicontrol(S.ph_arazi,'Style','edit','String','0',...
    'HorizontalAlignment','right','BackgroundColor','w',...
    'Position',[250 68 40 18]);

S.eth_yegim = uicontrol(S.ph_arazi,'Style','edit',...
    'String','0','HorizontalAlignment','right',...
    'BackgroundColor','w','Position',[250 40 40 18]);


S.eth_xegim.Callback = {@errmsg,S};
S.eth_yegim.Callback = {@errmsg,S};

MATLAB GUI 错误 Reference to non-existent field '---'

MATLAB GUI error Reference to non-existent field '---'

matlab

user-interface

char

integer