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i want to create an error msg in matlab gui

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partha das
partha das 2011-7-13
I want to run a program where a excel file will be taken as input and i want that if the excel file is not find there should be an error msg. how can i create that type of error msg box. here file name is stored in a variable named a. please help me. thank you in advance..

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Friedrich
Friedrich 2011-7-13
Hi,
You have to use the exist function. If the Excel file is not on the MATLAB path you will need the absolut path to it. And than do
if exist(a,'file') ~= 2
msgbox('File Not found','Error','Error');
else
%file is there, do something with it
end
Where a should look like
a = 'C:\folder_with_file\name_of_file.xls'
a =
C:\folder_with_file\name_of_file.xls

更多回答（1 个）

Chirag Gupta
Chirag Gupta 2011-7-13
The previous answer seems to work. What are the contents of the variable? Is the variable a cell?
filename = 'MyTest1.xls'
if (~exist(filename,'file'))
msgbox('File Not Found','Error','Error');
end
What is the error if any that you are getting? Note that if the variable filename is a cell, you will need to pass the name explicitly like:
exist(filename{1},'file')
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Friedrich
Friedrich 2011-7-13
it works fine for me. please post your code and the content of the variable a

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