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how to check a path? file or folder?

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Mr M.
Mr M. 2015-2-12
编辑： Stephen23 2015-2-22
I would like a path input argument, which can be path of a jpg file or a folder. If it is a folder, I would like to go through its content and use all jpg images in there. How to check the path? And how to go through?

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回答（3 个）

Stephen23
Stephen23 2015-2-12
编辑：Stephen23 2015-2-22
You can check for the existence of a specific file or a folder using exist . You can use the second argument to tell the function what kind of things you want to check for, and check that the output is the expected number:
2==exist('root\directory\filename.jpg','file')
To locate all .JPG files in a specific directory, use dir :
S = dir('root\directory\*.jpg')
You can use relative or absolute paths, and the function returns a structure containing information that you might find useful, particularly the isdir logical.
Michael Haderlein
Michael Haderlein 2015-2-12
Use the exist() function. It will return 2 for a file, 7 for a folder, and, in case the path does not exist at all, you'll get the value 0 and can do error handling.
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Michael Haderlein
Michael Haderlein 2015-2-12
...or, as Stephen has mentioned, use dir(). You'll need that to go through, anyway.

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Image Analyst
Image Analyst 2015-2-18
You say "If it is a folder, I would like to go through its content and use all jpg images in there." So see my demo which goes through the folder and all its subfolders getting image filenames. You can then display or process them - whatever you want.

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