Tell the user something is wrong

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Inês
Inês 2022-1-10
回答： Image Analyst 2022-1-11
I have to ask the user to input some data so then I can show to him the image’s referring to the data he gave me however how can I write a script where I tell the user that the data he gave doesn’t exist in the images I have in my possession without appearing the error message from matlab. I think I made the question a little confusing but I hope someone understands and help me because it’s very important. Thank you!

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采纳的回答

yanqi liu
yanqi liu 2022-1-11
yes，sir，if check the file is or not exist，may be use
if ~exist(your_file_path, 'dir')
error('not exist');
end

更多回答（2 个）

Jon
Jon 2022-1-10
编辑：Jon 2022-1-10
If I understand your question, I think that you may find that you can use MATLAB's errordlg function can do what you are looking for. https://www.mathworks.com/help/matlab/ref/errordlg.html
Image Analyst
Image Analyst 2022-1-11
To check if a folder exists, where folder is your variable name, and alert the user if the folder does not exist, use isfolder():
if ~isfolder(folder)
errorMessage = sprintf('Error: folder does not exist:\n%s', folder);
uiwait(errordlg(errorMessage));
return;
end
To check if a file does not exist and alert the user if the file does not exist, use isfile():
if ~isfile(fullFileName)
errorMessage = sprintf('Error: file does not exist:\n%s', fullFileName);
uiwait(errordlg(errorMessage));
return;
end

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