GUIDE Callback function error

Question

Ketil 2014-5-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/128686-guide-callback-function-error

评论： Jan 2017-10-2

I am trying to create the simplest of simple GUIs with only one button that when clicked runs a .m file that is available in the Matlab path. The steps I take:

Create new GUI with GUIDE and save as VHDL_Project_2014_Test
Place one button in GUI and tag it buttonOpenCOM
Modify the Callback function for buttonOpenCOM to run the .m file VHDL_Project_Open
Save the project
Run the main .m file (not the .fig file)
When the GUI opens I click the button and get the following error message:

Error in VHDL_Project_2014_Test>buttonOpenCOM_Callback (line 81)
VHDL_Project_Open;
Error in gui_mainfcn (line 96)
        feval(varargin{:});
Error in VHDL_Project_2014_Test (line 42)
    gui_mainfcn(gui_State, varargin{:});
Error in
@(hObject,eventdata)VHDL_Project_2014_Test('buttonOpenCOM_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

Why is this error appearing? What can I do to remove it?

Note: I also get another error before this but this error I also get if I run the external .m file by itself (because nothing is connected to COM port 40 on my PC. For clarity this error message is:

Error using serial/fopen (line 72)
Open failed: Port: COM40 is not available. No ports are available.
Use INSTRFIND to determine if other instrument objects are connected to the
requested device.
Error in VHDL_Project_Open (line 22)
fopen(s);

2 个评论
显示无隐藏无

David Sanchez 2014-5-7

could you attach the file with your code or paste it to see how you code it?

Ketil 2014-5-7

I have added the files to my original post.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Roberto 2014-5-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/128686-guide-callback-function-error#answer_135916

在 MATLAB Online 中打开

the problem isn't your GUI the problem is in your VHDL_Project_Open.m file, at the

fopen(s);

Line, this means that s is not valid!! this is mostly like because you don't have the COM40 port open in your computer, you have to ensure you know the name of the COM port opened in your computer, go to the Windows device administrator to see ports available.

3 个评论
显示 1更早的评论隐藏 1更早的评论

Roberto 2014-5-7

编辑：Roberto 2014-5-7

that's right, in fact everything executed in a GUI is running only in the GUI's workspace!! even more: only in the function that executed it!

you have various methods:

Nested functions
guidata
setappdata/getappdata

Try reading this

Ketil 2014-5-7

Thanks!

请先登录，再进行评论。

Answer 2

Noor qazaer 2017-10-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/128686-guide-callback-function-error#answer_283973

i have a problem , what is a solve ????

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jan 2017-10-2

Please open a new thread for a new question. This "thread hijacking" is confusing only and you cannot accept an answer, if it solves your problem. Please delete this pseudo-answer after you have created your own thread. Thanks.

请先登录，再进行评论。