[Scilab-users] Regex problem

[Gerhard Kreuzer]

Hi Jan,

 

get it.

Yesterday I faild until I see that the file wasn’t accessible, for what reason ever. I don’t get an error message, but after mgetstr I don’t have any data read. After rebooting the machine, this problem dissappears.

 

Here the working version:

 

// Copyright (C) 2016 - Liftoff - Gerhard Kreuzer msc.

//

// Date of creation: 26.08.2016

//

 

// Just for tests

clear;

fnRawData='Works.raw';

fnRawData='Fails.raw'       // Comment out to see working file which contains only dummy data

 

// HEUREKA, both files working now

 

fdRawData = mopen(fnRawData,'rb');

 

// Find start of binary data by searching the first non ascii value

// No problem if the exact end is missed, regex will do the rest

if ~meof(fdRawData) then c = mgeti(1, 'uc', fdRawData); end

while ( c < 128 & c >= 32 ) & ~meof(fdRawData)

    c = mgeti(1, 'uc', fdRawData);

end

metaDataEnd = mtell(fdRawData)                                  // Note down this position

mseek(0, fdRawData, 'set');                                     // Rewind file                                  //

 

strData = mgetstr(metaDataEnd - 1, fdRawData);                  // Read whole meta data block, only ASCII values go here

[dummy,dataStart,dataMatch,data]=regexp(strData,'/#data#/');    // Analyze meta data, we just seek for the begin of the binary data here

 

mseek(dataStart, fdRawData, 'set');                             // Set file pointer to correct position

sset = mgeti(7, 'il', fdRawData);                               // Read first sample set, just for test.

 

mclose(fdRawData);                                              // Ich habe fertig

 

 

I am sure ther could be done some optimization, but ist a good start now.

 

Thanks a lot.

 

With best regards

 

Gerhard

 

Von: JLan [via Scilab / Xcos - Mailing Lists Archives] [mailto:ml-node+s994242n4034504h24 at n3.nabble.com] 
Gesendet: Freitag, 26. August 2016 19:09
An: Gerhard Kreuzer
Betreff: Re: Regex problem

 

Gerhard

Would this work? Read as much as you need as binary and convert the non ascii values to an ascii value, for instance 0. 

The below is not optimized, and I have no idea why the strsplit is needed, but I got an "unknown error" without it:

fid=mopen(datafile,"rb");
btr=1000;
B=mgeti(btr+1,"uc",fid);
for i=1:btr+1
        if B(i)>128 | B(i)<32 then B(i)=48; end
end
S=strsplit(ascii(B),btr);
strData=S(1);

[dataStart,dataEnd,dataMatch,data]=regexp(strData,'/#data#/') 
...
Jan Å

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