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 FindFiles and maximum string length		  New Topic  Reply to Topic
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JokerOne

Germany
58 Posts
Posted - 06/16/2016 :  03:13:29 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. 9.1 and Service Release (Select Help-->About Origin):
Operating System: Win 7

Hello everybody,

I am using FindFiles followed by a fileimport-loop to get a larger number of files imported to Origin automatically.

While this usually works fine I experience crashes of Origin, when the number of files become large and/or the folder+filenames of the files are long (e.g. 200 characters per file and 150 files).

I assume, that the crashes is due too a limit in a string length

findFiles path:=filepath$ fname:=filesinpath;

thus the string "filesinpath$" cannot be set correctly?

Is my assumption correct and if so, what is the maximum string length?

Thank you!

Chris D

428 Posts
Posted - 06/16/2016 :  09:31:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

We can create a simple script to test the maximum allow length of a string variable in LabTalk by creating a loop and adding a character to a string for every iteration. Below I will do 10,000 iterations and then test length of generated string:

string str$;
for (int ii = 1; ii <= 10000; ii++)
{
	str$ += "X";
}
str.GetLength()=;


That should output:
str.GetLength()=8191


You also have to take into account the delimiters between each returned file name (CRLF) which is 2 characters.

Perhaps you are going to have to take a more complex approach.

Thanks,
Chris Drozdowski
Originlab Technical Support
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cpyang

USA
1406 Posts
Posted - 06/20/2016 :  8:05:16 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Maybe you can set addpath:=0 to get only the name of the files and not the full path, since you have the path in filepath$ to begin with.

I also tested and found the resulting string variable can hold much more then 8191 characters. I don't have a folder with more files, but here is what I found using a folder with Origin source code:

string results$;
string sPath$="D:\dev\Source\vc32\OKern96\";
findFiles path:=sPath$ ext:="*.*" addpath:=1 fname:=results$;
results.GetLength()=;
int nn = results.GetNumTokens(CRLF);
nn=;

I got the following print out
quote:

results.GetLength()=33590
nn=781

So 781 files with full path taking up 33590 bytes and I don't see a crash. I did not try this in 9.1 though.

CP
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cpyang

USA
1406 Posts
Posted - 06/20/2016 :  9:08:11 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
hi Chris,

In your test about with str$+="X"; the 8191 limit has nothing to do with string variables themselves, but rather with the LabTalk assignment. Basically, any LabTalk expression involving '=' has a buffer that is 8192 in size, so the transfer from Right-Hand-Side to Left-Hand-Side will be limited to the 1st 8191 characters. If the LabTalk statements are not involving '=', then the bigger string can work perfectly fine.

CP
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