Binary file format

Hello!
What is the binary file format for files created by Labview's example High
Speed Data Logger? The header information comes first, but how is the actual
logged data written in the file? I have logged two channels.
Thanks in advance for advice.
Best regards,
Antti Ryhänen

The LV code first converts the I16s to U16s and casts it as single-precision floats. It them multiplies the result by a scaling factor that's stored in the data header and adds an offset that's found in the same place.
Mike...
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Hi,
I have some binary files that I wrote in Labview containing data of type double. I'm trying to load the data in Matlab but I am not having much success. In Matlab I am using the fread command and specifying the type as double with the machine format as 'b' for big-endian. But the values I get do not make any sense. Does anyone know what format Labview saves the data in? Is it big-endian? Or something else?
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Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

Binary file format to Ascii format

Hi,
I have a file in binary format in app server. I want to read the file in Binary mode and write that in legacy text mode. Problem here is... when I read that file in binary mode and passing to internal table. First record was fine from the second line carriage return(##) messing up my format. Anybody has any idea.
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How can I read a binary file stream with many data type, as with AcqKnowledge physio binary data file?

I would like to read in and write physiological data files which were saved by BioPac�s AcqKnowledge 3.8.1 software, in conjunction with their MP150 acquisition system. To start with, I�d like to write a converter from different physiodata file format into the AcqKnowledge binary file format for version 3.5 � 3.7 (including 3.7.3). It will allow us to read different file format into an analysis package which can only read in file written by AcqKnowledge version 3.5 � 3.7 (including 3.7.3).
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I guess the problem I had was that I could not manage to read all the different byte data stream with File.vi. This is easy in C but I did not get very far in LabView 7.0. Also, I was a little unsure which LabView data types correspond to int, char , short, long, double, byte, RGB and Rect. And, since it is for PC I am also assuming the data to be written as �little endian� integer, and thus I also used byte swap vi.
Two samples *.acq binary files are attach to this post to the list. Demo.acq is for version 3.7-3.7.2, while SCR_EKGtest1b.acq was recorded and saved with AcqKnowledge 3.8.1, which version number is 41.
I would be grateful if you someone could explain how to handle such binary file stream with LabView and send an example to i
llustrate it.
Many thanks in advance for your help.
Donat-Pierre
Attachments:
Demo.acq ‏248 KB
SCR_EKG_test1b.acq ‏97 KB

The reading of double is also straight forward : just use a dble float wired to the type cast node, after inverting the string (indian conversion).
See the attached example.
The measure of skin thickness is based on OCT (optical coherent tomography = interferometry) : an optical fiber system send and received light emitted to/back from the skin at a few centimeter distance. A profile of skin structure is then computed from the optical signal.
CC
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
Read_AK_time_info.vi.zip ‏9 KB

How can I read a binary file stream with many data type, as with AcqKnowledge physio binary data file?

I would like to read in and write physiological data which was saved by Biopac�s AcqKnowledge 3.8.1 software, in conjunction with their MP150 acquisition system. To start with, I�d like to write a converter from different physiodata file format into the AcqKnowledge binary file format for version 3.5 � 3.7 (including 3.7.3). It will allow us to read different file format into an analysis package which can only read in file written by AcqKnowledge version 3.5 � 3.7 (including 3.7.3).
I attempted to write a reader following the Application Note AS156 entitled �AcqKnowledge File Format for PC with Windows� (see http://biopac.com/AppNotes/app156FileFormat/FileFormat.h
tm ). Note the link for the Mac File format is very instructive too - it is presented in a different style and might make sense to some people with C library like look (http://biopac.com/AppNotes/app155macffmt/macff.htm) .
I guess the problem I had was that I could not manage to read all the different byte data stream with File.vi. This is easy in C but I did not get very far in LabView 7.0. Also, because it is for PC I am assuming the data to be written as �little endian� integer, and thus I also used byte swap vi.
I would be grateful if you someone could explain how to handle such binary file stream with LabView and send an example to illustrate it.
Many thanks in advance for your help.
Donat-Pierre

One more step...
short are U16 integer
double are double precision float
bool seem to be 2 bytes (= U16)
char are string (variable length)
rgb are U16 integer, with high order byte = 0
rect should be 4 x U16 (top, left, bottom, right)
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

The binary file processing in PDA device (LabVIEW PDA Module)

To whom it may concern,
I created a VI application, which should read some binary files and transform them to waveforms shown in the Waveform Graph. I implemented it with Mobile/PDA module. This application runs successfully on my desktop, that is, on the Labview Front Panel. However, when I run it on "Windows Mobile 5.0 Pocket PC Device" (a PDA has been already connected to the PC), all the windows, menus, buttons are displayed correctly, the only thing wrong is that the waveform can't be shown in the Waveform Graph. So, I wonder whether the Windows Mobile system will automatically modify the binary file format a little when I copy them from the PC to my PDA so that the original VI can't process it as what I expected in PC execution. Or, are there any requirements for the programs that will be executed in actual Windows Mobile Device?
Thanks a lot for any comments and suggestion.

Thanks, Jeremy,
I used LabVIEW 8.5.1. I rechecked and debugged the VI. The problem is not due to the Waveform Graph. I set an indicator after the Read File unit, in both PC Front Panel and PDA Front Panel. As I described before, when I run it in the PC Front Panel, the indicator could show the right values read from the file. But when I switch to PDA Device Front Panel, the indicator shows zero (invalid values), which demonstrate that the data is not accessed from original files.
The units I used are shown as follows:
File Dialog ---> Open/Create/Replace File ---> Get File Size ---> Read From Binary File (Here I set an indicator, no values read from the file, but if run in PC, correct values will be shown).
In this case, I guess the problem should come from the transfer (copy operation) of the file from PC to PDA. Or the operation behavior for LabVIEW Read File unit is a little different for PDA implementation from its PC implementation.
If you want more information, including the original binary file or VI, please let me know. Thanks a lot.

Binary file import and export in lab windows cvi

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I have some standard binary file format (.sie) that has been written in origin IDE. The sie type extension file format is a public format, but not defined by Origin. In origin IDE, i can be able to import these files and also be able to export it to excel as csv type. Now, i want to do the same thing in lab windows cvi. i need to import .sie type file and be able to read and export it to excel in lab windows cvi. Is this possible? Please help me to work on this project. Thanks in advance.
Regards,
Jayakumar.V

Reading and writing binary file is indeed possible in CVI, the problem normally lien in the definition of the file format you want to access.
I never found .SIE extension during my activity; a fast search on google returned this page with a link to the document explaining one file structure: it's a format dedicated to accounting so it's possibly not your case, but could they be your files?
Before finding the complete description of the file format you cannot think of any operation on the file itself, unless it is so self evident that you need little effort to access file content (this normally happens only on text files).
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

Binary file

hi
i write in labview to binary file the data is double i suppose the default mode is without any headers i have succed to read it back in labview
the problem is that i cant read the file from other places
in matlab i recieve garbage
fid = fopen(filename,'bin')
data = fread(fid,....)
fclose(fid)

The binary data that LabVIEW writes is going to be readable only by
LabVIEW because there is no "standard" binary file format. Each
application that can handle binary files has it's own method of
creating the file format.
If you want the data to be available to read in other applications, you
should save it as an ASCII (text) file. Most applications can read an
ASCII file is some standard format like comma separated values or tab
delimited files.
If writing speed is an issue, try first writting the files as binary, then convert them to ASCII when needed.
Ed
Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.

Parsing binary file- unsigned longs

Hello everyone.
I'm currently trying to write a quick parser for a binary file format (ASF). However, java's handling of bit shifting and lack of unsigned types is driving me completely mad.
How can I represent an unsigned long?
How can I set the bits for it anyway? It seems that the shift operator can't shift more than an int's worth (it just loops around and starts adding to the other bits- weird).
Thanks in advance.
Simon

ejp wrote:
But why in the world does the following code also do nothing?
long x = 45 << 32;
Try long x = 45L << 32;
The answer appears to be that java uses ints to represent all constants, but this presents some serious problems- namely- how on earth do you get a number bigger than an int into a long?With 'L'. Same as in C or C++. In Visual Basic it's '&'. There's generally something.Where did that come from? Why have I never seen anything like that before?
If I do long x = 0x7FFFFFFF; all is well, but if I do long x = 0x80000000; I get FFFFFFFF80000000, which isn't what I asked for.Actually it is exactly what you asked for. You've overlooked several facts: (i) Java longs are 64 bits; (ii) you specified a negative 32-bit constant; (iii) the rules of every programming language I can think of provide for sign-extension when going from a shorter to a longer type.Right. It makes sense now that I know how to specify long constants.
As someone pointed out signed/unsigned is actually the same, so long as you interpret it correctly. So to avoid the total stupidity of using twice as much memory for everything I've decided that I am actually going to use the correct types.They're not the correct types. As I pointed out in an earlier post, your 'unsigned longs' must be coming from C or C++ where they are generally 32 bits, so using a 64-bit Java long is incorrect.Where they came from doesn't matter. The spec doesn't say it's a "long"- it says that this particular value is 64bit, and that all values are unsigned. So I do need a Java long.
WHY IN THE WORLD IS JAVA "INTELLIGENT" WHEN DOING THINGS BITWISE? WHICH BRAIN DEAD IDIOT THOUGHT THAT UP? That is broken and is asking for trouble.It is you who is asking for trouble here. The rules of Java are consistent and in conformity with the practice in other programming languages. You've just overlooked several relevant facts.I think I've worked out where I was going wrong here. When doing something like
int i;
long x;
x = x | i;The i is converted to a long before the bitwise operation, so it's not the bitwise operation that's the problem, it's the conversion between int and long?
It's not Java whose stupidity is the issue here ;-)That wouldn't surprise me.
Thanks.

How to convert binary file to a particular format?

Hi,
I am having a requirement. I have in database various kinds of files stored as binary format. Its a sybase database. Now the files can be .pdf, or .doc also. But they are stored in binary format.
I need to read the file from database.
Now I can use jdbc to read the particular column value which contains the file in binary format.
But tricky part is how to convert the binary file entry in a proper respective file format? So I have another column which basically has the value to tell the type of file. So I have ".doc" or ".pdf" as each entry of file...
So please help me how can we do this using Java?
THanks

Hi,
I am having a requirement. I have in database various
kinds of files stored as binary format. Its a sybase
database. Now the files can be .pdf, or .doc also.
But they are stored in binary format.
I need to read the file from database.
Now I can use jdbc to read the particular column
value which contains the file in binary format.
But tricky part is how to convert the binary file
entry in a proper respective file format? So I have
another column which basically has the value to tell
the type of file. So I have ".doc" or ".pdf" as each
entry of file...
So please help me how can we do this using Java?
THanks

I have written a binary file with a specific header format in LABVIEW 8.6 and tried to Read the same Data File, Using LABVIEW 7.1.Here i Found some difficulty.Is there any way to Read the Data File(of LABVIEW 8.6), Using LABVIEW 7.1?

I have written a binary file with a specific header format in LABVIEW 8.6 and tried to Read the same Data File, Using LABVIEW 7.1.Here i Found some difficulty.Is there any way to Read the Data File(of LABVIEW 8.6), Using LABVIEW 7.1?

I can think of two possible stumbling blocks:
What are your 8.6 options for "byte order" and "prepend array or string size"?
Overall, many file IO functions have changed with LabVIEW 8.0, so there might not be an exact 1:1 code conversion. You might need to make some modifications. For example, in 7.1, you should use "write file", the "binary file VIs" are special purpose (I16 or SGL). What is your data type?
LabVIEW Champion . Do more with less code and in less time .

Binary file of unknown formats

Hello everybody,
I posted a message earlier today but unfortunately I missed to give more details about my problem. I am sorry about that. I am a new user of LabView so I still have many things to learn. What I am trying to do is use LabView (8.2) to read a file that was created by UVP Monitor, V3.0 (*.mfprof file).
This package saves fluid velocity information. There are 65 channels that form a velocity profile in a pipe. Also, there are 4096 velocity profiles, each velocity profile was captured at a time rate of 9 ms. I don’t know what is the format of these values.
At present, I obtain a text file from UVP Monitor, then process the data using FORTRAN and finally plot the results. I want to avoid this and read the UVP file, process, analyze and plot the data using only LabView. I want to read individual experimental parameters as well as the bulk of the data. In this way the user has different options to choose from before processing and plotting the results. I actually built a VI that processes and plots the text files and it runs great.
The problem I am facing now is that I want to read the UVP file but I have no information about the structure of it. I am assuming it is a binary file but that is all I can say about it.
The header and footer seem to be in text format, that is all I can read; however, the body of the file I am not yet able to read.
The information from the file is sent to the type cast function. Then I set a string indicator in the “Normal” option in Properties. I can read the header and footer but not the body of the file; for the body of the file all I can see is characters of the type
“C¾ Ü Qþ X@ “. One of the other options, Password, seems to provide an output of just the characters that were originally written, but then again, I can not read the characters because it is only asterisks and I can not copy them onto a word processor either.
I have tried other options as well, such as Variant to flattened string and flattened string to variant, flatten to string and unflatten from string. Unfortunately none of them worked.
I am attaching the VI I wrote and a sample UVP file , I would appreciate if someone could explain to me how to deal with complex binary files in LabView and share an example with me if possible.
Regards,
Roberto
Attachments:
BINARY Read UVP file.vi ‏45 KB
Test UVP file.zip ‏693 KB

OK, here's a quick draft how you could do it in LabVIEW. Modify as needed, e.g. slice out the interesting columns, etc.
The header has some binary data that may, or may not, mean something useful.
See if the data "looks" about right.
Message Edited by altenbach on 04-26-2007 08:13 PM
Message Edited by altenbach on 04-26-2007 08:15 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
BinaryRead.png ‏10 KB
BINARY Read UVP file2.vi ‏46 KB

Basic Binary File Does not Read Unless Placed into Exact Format it originated?

Ok, check this out. This just does not make any sense to me. First, you'll need to run it and create the two files. You're going to get an error at the close. Now...here's what doesn't make any sense to me. If you enable the disabled diagram and read that same file, you can look at how the file is being read and the data interpreted. How is that any different and not causing an error? I took the U8 and changed it back to its original Boolean Array[8] format and received no error. Which means the data was read as a U8 at some point. But...for whatever reason, cannot be read and displayed as a U8. What's up with that? What am I not understanding?
Remember, code does exactly what you tell it.
Solved!
Go to Solution.
Attachments:
Binary File Issue.vi ‏23 KB

DailyDose wrote:
Huh....no read and write. Either read or write. Gotcha.
Not quite. It is a matter of where the file pointer is.
The file pointer is what location in the file will be read from or written to, depending on what you do next. When you write to a file, the file pointer is set to be directly after what you just wrote. So when you write a new file, the file pointer is at the end of the file. So when you try to do a read when the file pointer is at the end of the file, an attempt of a read at the end of the file happens. But there is nothing left for it to read. Therefore you get an End Of File error.
So if you just added a Set File Position to set the file pointer to the start of the file, you can read your byte with no error.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Attachments:
Binary File Issue_BD.png ‏25 KB

Binary file format

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