size of image file

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Ju
Ju 2012-3-6
hi. I want to ask about: how can we get the size of an image file (in Byte/kByte)? Because i want to put it in the edit box/text. thanks.

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回答（2 个）

Walter Roberson
Walter Roberson 2012-3-6
Use dir() and look at the "size" field that is returned; that will be in bytes.
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Ju
Ju 2012-3-6
sorry for bothering you again.
but there's an error, it says: "dir is not defined for 'uint8' input"
what does it mean? and how can i fix it?
thanks a lot.
Jan
Jan 2012-3-6
@Walter, a small typo: filesize = fileinfo(1).bytes, not ".size".

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Jan
Jan 2012-3-6
"dir is not defined for 'uint8' input"
This mean that you call DIR with an UINT8 variable like:
a = uint8(rand(10));
b = dir(a);
I assume you read an image file into a variable and use this variable instead of the filename afterwards.
A general recommendation: It is efficient to post the code, which causes the problem, and the complete error message. Then assisting is easier and efficient.
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Ju
Ju 2012-3-6
this is my code:
[fileName,pathName] = uigetfile({'*.gif','Animated GIF FIle{*.gif}'},'Open File');
[imageFile map] = imread(fullfile(pathName,fileName),'frames','all');
temp = imageFile;
fileInfo = dir(temp);
fileSize = fileInfo(1).size;
set(handles.edit1,'String',num2str(fileSize));
can you tell me what's wrong with that?

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