How to display long text in a GUI window, input to textscan for generic textfiles.

3 次查看（过去 30 天）
John
John 2015-9-11
编辑： Terence Etchells 2018-11-16
Hey guys,
i would like to display long text in a new GUI after pushing a pushbutton. The text is stored in a textfile. I found this code that shall create the GUI i need.
%# read text file lines as cell array of strings
fid = fopen( fullfile('C:\Users\powersyslab\Desktop\license.txt'));
str = textscan(fid, '%s', 'Delimiter','\n'); str = str{1};
%fclose(fid);
%# GUI with multi-line editbox
hFig = figure('Menubar','none', 'Toolbar','none');
hPan = uipanel(hFig, 'Title','Display window', ...
'Units','normalized', 'Position',[0.05 0.05 0.9 0.9]);
hEdit = uicontrol(hPan, 'Style','edit', 'FontSize',9, ...
'Min',0, 'Max',2, 'HorizontalAlignment','left', ...
'Units','normalized', 'Position',[0 0 1 1], ...
'String',str);
%# enable horizontal scrolling
jEdit = findjobj(hEdit);
jEditbox = jEdit.getViewport().getComponent(0);
jEditbox.setWrapping(false); %# turn off word-wrapping
jEditbox.setEditable(false); %# non-editable
set(jEdit,'HorizontalScrollBarPolicy',30); %# HORIZONTAL_SCROLLBAR_AS_NEEDED
%# maintain horizontal scrollbar policy which reverts back on component resize
hjEdit = handle(jEdit,'CallbackProperties');
set(hjEdit, 'ComponentResizedCallback',...
'set(gcbo,''HorizontalScrollBarPolicy'',30)')
Unfortunately i get the error:
Error using textscan
Invalid file identifier. Use fopen to generate a valid file identifier.
How can i adapt the inputs of the textscan function so that it can read generic text. Because the text i need is not formatted in a special way. It is just lines of text and numbers but in no specific order.
I would be glad for help!
Best regards, John
  3 个评论
显示 1更早的评论
John
John 2015-9-11
Oha you are right, sryyy, i really chose the wrong path to my textfile:(
now i have another error occuring:
Undefined function 'findjobj' for input arguments of type 'double'.
How can that be? i took a look in the documentary of findobj but everything seems fine. Findobj just needs a handle to an object and that is given by 'hEdit'.
I dont get the mistake.
Best regards, John
Terence Etchells
Terence Etchells 2018-11-16
编辑：Terence Etchells 2018-11-16
If you are here you may have encountered a problem with your GUI
If you are running R2018b or later you will need to download Yair Altman's latest version of findjobj.m from
https://uk.mathworks.com/matlabcentral/fileexchange/14317-findjobj-find-java-handles-of-matlab-graphic-objects.
there is a bug fix for R2018b.
Regards
Terence Etchells

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Guillaume
Guillaume 2015-9-11
The error you're getting is nothing to do with reading generic text. It's telling you that the fid you're passing to textscan is not valid. Most likely, it's not valid because fopen failed to open the file (due to not being present, not having permission or a million other possibilities).
You could change the beginning of the code to:
[fid, errmsg] = fopen( fullfile('C:\Users\powersyslab\Desktop\license.txt'));
if fid == -1
error(errmsg);
end
In general, when dealing with files / user input, it's always a good idea to check that the input received is what you expect.
  4 个评论
显示 2更早的评论
Guillaume
Guillaume 2015-9-11
One of two things:
- your code indeed intend to use findobj, in which case the syntax you're using is incorrect. You're only telling findobj where to search, but not what to search for.
- the code did indeed intend to use a function called findjobj, not part of matlab. Most likely, the one written by Yair, available < https://www.mathworks.co.uk/matlabcentral/fileexchange/14317-findjobj-find-java-handles-of-matlab-graphic-objects here>.
I'd lean toward the latter.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Text Files 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by