Question

我有一个Matlab GUI列表框，可以显示文件夹和按钮中的每个文件。如果我选择列表框中显示的文件之一并单击按钮，则该程序应该运行。这是我的代码：

@NamedQuery(name = "findBookingByVehicle", query = "SELECT c.colour, c.seats, c.make, c.model, b.departureDate, b.returnDate, b.bookingDate, e.fname, e.lname FROM Vehicle c JOIN c.booking b JOIN b.employee e WHERE c = b.vehicle AND b.employee = e ORDER BY b.bookingDate, b.departureDate ")

但是我收到错误未定义的函数或变量＆＃39; fileselected＆＃39;。任何的想法？谢谢......

Answer 1

在函数tab1button_Callback中，未声明变量fileselected。你必须声明fileselected全局或甚至更好地将它放入handles结构中，这是所有函数的参数。此结构旨在存储用户数据。

allfiles = dir; %get files
allname = {allfiles(~[allfiles.isdir]).name};
set(handles.wavlist, 'String', allname);

function wavlist_Callback(hObject, eventdata, handles)
 filenames = get(hObject, 'String');
 filechoice = get(hObject, 'Value');
 handles.fileselected = wavnames{filechoice};

function wavlist_CreateFcn(hObject, eventdata, handles)
 if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
     set(hObject,'BackgroundColor','white');
 end

function tab1button_Callback(hObject, eventdata, handles)
 [y, fs, nbits, opts] = wavread(handles.fileselected);

在列表框Matlab GUI中选择文件

1 个答案: