Solved Test if a variable is a string (Batch)

Wahine September 9, 2011 at 20:19:27

Perhaps you might want to show what the content of %file% can be? I get the impression from your post that %file% contains just one character or digit and that you want to determine whether that character or digit is numeric or alpha? Sorry I'm so dumb. Please come back & tell us if your problem is resolved.

lizac September 12, 2011 at 06:10:44

Hi! Wahine. Actually, there are several possible output on %file% since it's an error log file. Anyways, one of the output i could get in %file% is Magick: image widths or heights differ `flash_home_half.png' @ error/compare.c/CompareImageCommand/957. So i guest, it is safe to say that it will be a combination of alphanumeric characters with some punctuations. Can you tell? Thanks!

Wahine September 12, 2011 at 16:06:03

Well, you got me there. The way your script is written is a bit puzzling, using Tokens=* means that %%A will always contain the entire line therefore you are comparing 0 (zero) with the entire line, the return will always be True. Try using Tokens=1* but note that if the first delimited field is anything other than just 0 (zero) the script will always give the same return regardless of whether or not the field is totally numeric. So if the start of the file is: 0 Magick: .... the return will be False and "this is a number" will be echoed. 01 Magick: ... the return will be True and "this is a string" will be echoed. 0Magick: ..... the return will be True and "this is a string" will be echoed. Hope this helps you. Please come back & tell us if your problem is resolved.

lizac September 13, 2011 at 20:49:23

Hi! Wahine. Thanks for your help. I think I can take it from here but just one more favor to ask. Can you tell if it's possible that I could find just a few words like "error" "magick" in the phrase then do a test if the words are there? I'm struggling about the right and working syntax actually. Any help again would be very much appreciated.

Wahine September 14, 2011 at 19:42:30

✔ Best Answer

Sure, but if you find the word or phrase (string) then there is no need to test further for it. I set up a little demo test to locate the line(s) with Magick in them in a trial file. The trial file is named Trial.txt and the content is: Magick: image widths or heights differ `flash_home_half.png' @ error/c Magic: image widths or heights differ `flash_home_half.png' @ error/c Magick: image widths or heights differ `flash_home_half.png' @ error/c Note that the second line does not contain Magick only Magic so should not be found. Because I didn't know what you wanted to do after the string was found I simply wrote the lines to a temp file and displayed them removing Magick. @echo off>%temp%\file.txt cls setlocal enabledelayedexpansion set file=trial.txt findstr "Magick" %file%>>%temp%\file.txt for /f "tokens=*" %%1 in (%temp%\file.txt) do ( set line=%%1 set line=!line:Magick=! echo !line! ) Output is: : image widths or heights differ `flash_home_half.png' @ error/c : image widths or heights differ `flash_home_half.png' @ error/c You could review the Find and Findstr commands. Hope this helps. Please come back & tell us if your problem is resolved.

lizac September 20, 2011 at 09:38:48

thanks a lot!