Thread Subject: uigetfile: check for Cancel button pressed.

Greetings!

I write a script and use uigetfile function to select file to open:

  [InputFileName,InputFilePath] = uigetfile(...

and right after check for a Cancel button pressed:

  if (InputFileName == 0) && (InputFilePath == 0)
    error('Input file is not selected!')
  end

Now, in case of Cancel button pressed I get 'Input file is not selected!' error message and my script is terminated. However if I select a file from dialog and push Open button I get 'Operands to the || and && operators must be convertible to logical scalar values.' error message and my script is terminated also...

How to solve the problem?

P. S. Help for uigetfile function states "If the user clicks Cancel or closes the dialog window, FileName and PathName are set to 0.".

In article <gio2je$32p$1@fred.mathworks.com>,
 "Andrey Kazak" <AK@nospam.ru> wrote:

> Greetings!
>
> I write a script and use uigetfile function to select file to open:
>
> [InputFileName,InputFilePath] = uigetfile(...
>
> and right after check for a Cancel button pressed:
>
> if (InputFileName == 0) && (InputFilePath == 0)
> error('Input file is not selected!')
> end
>
> Now, in case of Cancel button pressed I get 'Input file is not selected!'
> error message and my script is terminated. However if I select a file from
> dialog and push Open button I get 'Operands to the || and && operators must
> be convertible to logical scalar values.' error message and my script is
> terminated also...
>
> How to solve the problem?
>
> P. S. Help for uigetfile function states "If the user clicks Cancel or closes
> the dialog window, FileName and PathName are set to 0.".

Use

  if isequal(InputFileName,0)

(You only need to test one of the variables.)

--
Doug Schwarz
dmschwarz&ieee,org
Make obvious changes to get real email address.

"Andrey Kazak"
> [InputFileName,InputFilePath] = uigetfile(...
> if (InputFileName == 0) && (InputFilePath == 0)
> error('Input file is not selected!')
> end
> Now, in case of Cancel button pressed I get 'Input file is not selected!' error message and my script is terminated. However if I select a file from dialog and push Open button I get 'Operands to the || and && operators must be convertible to logical scalar values.'...

a hint:

% what does this snippet do
     fn='myfile.m'; % <- assume you selected this file in the box...
     fn==0
% ans =

does it look like a scalar?
us

Doug Schwarz
> > P. S. Help for uigetfile function states "If the user clicks Cancel or closes
> > the dialog window, FileName and PathName are set to 0.".

> if isequal(InputFileName,0)

another one of the many solutions

if ischar(fn)
% a file
else
% returned DOUBLE(0)
end

us

Thank you guys!

Topic is closed...

"Andrey Kazak" <AK@nospam.ru> wrote in message <gio2je$32p$1@fred.mathworks.com>...
> Greetings!
>
> I write a script and use uigetfile function to select file to open:
>
> [InputFileName,InputFilePath] = uigetfile(...
>
> and right after check for a Cancel button pressed:
>
> if (InputFileName == 0) && (InputFilePath == 0)
> error('Input file is not selected!')
> end
>
> Now, in case of Cancel button pressed I get 'Input file is not selected!' error message and my script is terminated. However if I select a file from dialog and push Open button I get 'Operands to the || and && operators must be convertible to logical scalar values.' error message and my script is terminated also...
>
> How to solve the problem?
>
> P. S. Help for uigetfile function states "If the user clicks Cancel or closes the dialog window, FileName and PathName are set to 0.".

% One more solution:

if (InputFileName(1) == 0) && (InputFilePath(1) == 0)

someone wrote:
 
> % One more solution:
>
> if (InputFileName(1) == 0) && (InputFilePath(1) == 0)

Does Microsoft promise to follow the POSIX standard that filenames may not have
embedded NUL characters (binary zeros that is)? Matlab preserves NUL characters
in strings.

>> char([0 65 66 67])

ans =

 ABC

>> length(char([0 65 66 67]))

ans =

     4

>> char([0 65 66 67]) + 0

ans =

     0 65 66 67

--
.signature note: I am now avoiding replying to unclear or ambiguous postings.
Please review questions before posting them. Be specific. Use examples of what you mean,
of what you don't mean. Specify boundary conditions, and data classes and value
relationships -- what if we scrambled your data or used -Inf, NaN, or complex(rand,rand)?