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#188511 - 2008-07-02 04:31 PM detect empty text files
booey booey Getting the hang of it Registered: 2005-07-25 Posts: 76 Loc: USA	Hi everyone. Does anyone know of a UDF that will detect all empty text files in a given directory? By empty I mean absolutely no text inside the file. Thanks.
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#188512 - 2008-07-02 04:35 PM Re: detect empty text files [Re: booey]
Richard H. Richard H. Administrator Registered: 2000-01-24 Posts: 4946 Loc: Leatherhead, Surrey, UK	You don't need a UDF. Enumerate the directory using DIR(), then use GetFileSize() on any files that you find. If the file size is zero then the file is empty.
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#188513 - 2008-07-02 04:35 PM Re: detect empty text files [Re: booey]
Gargoyle Gargoyle MM club member Registered: 2004-03-09 Posts: 1597 Loc: Valley of the Sun (Arizona, US...	As a rule of thumb (in other words I can not gaurantee the accuracy of my claim), if you were to check the file size and it = 0 bytes then it would be empty. _________________________ Today is the tomorrow you worried about yesterday.
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#188515 - 2008-07-02 04:46 PM

Re: detect empty text files [Re: Gargoyle]

Richard H. Offline

Administrator

Registered: 2000-01-24
Posts: 4946
Loc: Leatherhead, Surrey, UK

Here is an example:


BREAK ON

$sDir="D:\TEMP"

$sFile=DIR($sDir)
While $sFile
        If Not (16 & GetFileAttr($sDIR+"\"+$sFile))
                If Not GetFileSize($sDir+"\"+$sFile)
                        "File "+$sDir+"\"+$sFile+" is empty"+@CRLF
                EndIf
        EndIf
        $sFile=DIR()
Loop

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#188516 - 2008-07-02 04:59 PM Re: detect empty text files [Re: Gargoyle]
booey booey Getting the hang of it Registered: 2005-07-25 Posts: 76 Loc: USA	Gargoyle, the "empty" files were showing up as 1KB even though there appeared to be nothing in them. However, upon further review, there is one blank line in the file that's causing it to be greater than 0 bytes. If I delete that line, then it goes to 0 bytes. The files are created using redirectoutput. I'll have to look into why it's putting a blank line in there. I think I have an idea. Thanks for the response.
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#188517 - 2008-07-02 05:00 PM Re: detect empty text files [Re: Richard H.]
Les Les KiX Master Registered: 2001-06-11 Posts: 12734 Loc: fortfrances.on.ca	I find that it is not usually as simple as the OP initially states and that once info is pulled through the nose, a UDF is the real true answer. I like Bryce's DirPlus() UDF. It is very scalable and returns the COM handle allowing many FSO properties and methods to be used. I would think after 61 posts, the OP would be familiar with our UDF library. _________________________ Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
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#188519 - 2008-07-02 05:31 PM Re: detect empty text files [Re: booey]
Richard H. Richard H. Administrator Registered: 2000-01-24 Posts: 4946 Loc: Leatherhead, Surrey, UK	If you cannot get rid off the blank line from RedirectOutput() then you have a couple of choices Read each file and check if there are only blank lines Determine if there is a cutoff size below which you can assume that a file is empty. For example, if a file with data is never smaller than 20 bytes then you can assume that a file with less than 20 bytes is empty.
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#188520 - 2008-07-02 05:37 PM Re: detect empty text files [Re: Richard H.]
booey booey Getting the hang of it Registered: 2005-07-25 Posts: 76 Loc: USA	Thanks to all who responded. I just used DirPlus and the file.size FSO to determine that a 3 byte file is empty with only a blank line.
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#188523 - 2008-07-02 06:57 PM Re: detect empty text files [Re: booey]
Glenn Barnas Glenn Barnas KiX Supporter Registered: 2003-01-28 Posts: 4402 Loc: New Jersey	nix systems have an "od" utility that can display the contents of any file. By default, it does an octal dump, but -c will display the text, and -x will display hex. You can get a similar utility for Windows command lines from CygWin, or from the KMR Consulting web site. Using such a utility will help you understand exactly what is inside a file. Once you understand the content, you can properly adjust the logic in your script. Further, you'll find that an empty file with a "blank line" is actually two bytes - a carriage return and a line feed. If you don't trap the return from RedirectOutput, you'll get 3 bytes - the "0", a CR, and an LF. Glenn _________________________ Actually* I am a Rocket Scientist! $\:D$
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