Binary File Reader to a Chart

Hello All,
Newbie having some trouble with reading a chart from a binary file. My problem may be with trying to use a binary file, I am not sure. The x axis time is not the same length as the actual test time. I have acquired a rms voltage from a VCR RF envelope. I'm using a 6009 DAQ with LV 7.1 on Win2K. I have attached the recording vi and the reading vi and a sample file. I have tried different things including the examples that came with lab view. I need to write a small sized file because this test will last for 4 hours. I have another application that will run for 5 days. I appreciate any help or ideas.
Thanks,
bh3560
Attachments:
Chart write_Read.zip ‏140 KB

Hi,
The program you have attached acquires, saves and reads data in ASCII ( floating numbers) and not binary.
To get an idea on how to write and read data in binary format, look at attached examples( taken from examples shipped with labview)
Hope this helps
Regards
Dev
Attachments:
Cont Acq&Graph Voltage-To File(Binary).vi ‏88 KB
Graph Acquired Binary Data.llb ‏72 KB

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Binary File Read

Hello everyone,
I am not that comfortable with binary file reading. I am trying to learn.
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The Read vi which I have written is not giving the expected data.
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Binary file read byte unmatch

I tried to read one line of binary file as the top of the screenshot.
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I also tried read by byte, but still the same.
Any suggestion, thanks.
Solved!
Go to Solution.
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What program created this binary file?
If you can figure out how the file was created, then you can figure out how to read it.
We can't help because all you've shown are some bytes and say that some are right and some are wrong. What is the "raw one" you are referring to? What do you expect it to look like?
Message Edited by Ravens Fan on 01-26-2010 11:15 PM

Binary file read with bit offset..not byte offset.

hi,
i want to read a binary file with some offset ..not in bytes... offset in bits..my data is a single bit data stream size of 1GB ,after skipping particular bit offset i want to read the data in byte order..
Indrajit
| [email protected] | [email protected] .

hi , Gerd W
i am not able to follow your answer.... here with i attached a file to describe my query more clearly. Actually two channels of 1 bit data stream stored in two different files ,and the file size will be more than 10 GB.
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Binary file readed from Labview and Borland C++ v.5

Hi Everybody!
My problem is reading binary file from Labview 7.0 and Borland C++ version 5 is not the same.
Only one difference is "space". Reading from Labview I got "00" (decimal) and reading from Borland C++ I got "32".
I also try to read this binary file with Matlab 6 and I also got "00" as well as those from Labview.
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Hi,
These threads regarding reading of binary files was recently discussed in this forum
You might find some answers for your query
http://forums.ni.com/ni/board/message?board.id=170&message.id=99016&requireLogin=False
and
http://forums.ni.com/ni/board/message?board.id=170&message.id=153565&requireLogin=False
Regards
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Binary file reading

Dear All,
I have Binary file. I want to read Bytes based on Patterns and each channel value (Byte values -- > Float conversion) and storing it into Index array.
Please check the attachment for pattren format.
Here, the biggest problem is we will get only pattern style, Based on pattern the data is already stored in Binary file just we need to read it means we need to set the Timestamp based on this.
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Attachments:
Data Reading.xlsx ‏15 KB
Data Reading.xlsx ‏15 KB

Hi Munna,
that pattern is quite hard to understand. It seems there is some information missing…
In your pattern table the data size for e.g. ch1 is given as "1 byte", but in your time schedule you use two bytes for ch1. How are those "ch start position bytes" to be identified?
Byte values -- > Float conversion
How do you want to convert those bytes to Float (SGL or DBL)?
storing it into Index array
What is an "index array"?
It seems you have to create a table from your pattern which identifies the bytes in the file. That seems to be the trickiest part as in your pattern#2 example you already have made a mistake (for ch4 there is no marking at timestamp 70ms)…
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Binary file reading confusion

Hi there,
I'm trying to read a partially binary file with the following structure: The first three lines of the file are regular strings (one can see them correctly when opening the file in a text editor), the rest of the file's contents are integers in their binary form (one cannot see them correctly when opening the file in a text editor).
How can I read such a file?
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pfrc wrote:
Hi there,
I'm trying to read a partially binary file with the following structure: The first three lines of the file are regular strings (one can see them correctly when opening the file in a text editor), the rest of the file's contents are integers in their binary form (one cannot see them correctly when opening the file in a text editor).
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Thanks in advance!
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Large binary file reading

Hi,
I'm currently using a java.io.BufferedInputStream to read a large binary file.
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Loading it all to memory first would kill my performance so I'd like to be able to come up with an alternate method.
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Blob for binary file, read/write problems

Hi,
I am relatively new to this type of development so apologies if this question is a bit basic.
I am trying to write a binary document (.doc) to a blob and read it back again, constructing the original word file. I have the following code for reading and writing the file:
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BEGIN
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SELECT blob_column
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Thanks in advance.
Chris.

myOracleCommand.CommandText = "insert into blob_content(id, blob_column) values 2, empty_blob())";
OracleDataReader myOracleDataReader = myOracleCommand.ExecuteReader();
This looks wrong, you shouldn't be using ExecuteReader unless you expect to get a result back. Try using ExecuteNonQuery to do the insert.

Binary File reading in Java

can i read binary format file with java? if so, can you please suggest which class i should be looking into?
Thanks

FileInputStream

How to read a binary file written in LabVIEW 6.1 using VB ?

How to read a file saved in binay forrmat in LabVIEW 6.1 platform through VB.
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Hello,
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Convert Large Binary File to Large ASCI File

Hello, I need some suggestions on how to convert a large binary file > 200MB to an ASCI File. I have a program that streams data to disk in binary format and now I would like to either add to my application or create a new app if necessary. Here is what I want to do:
Open the Binary File
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sle,
In the future, please create a new thread for unrelated questions. To answer your question, you can use "Split Number" from the Data Manipulation palette.
Message Edited by jasonhill on 03-14-2006 03:46 PM
Attachments:
split number.PNG ‏2 KB

Binary File IO DLL Problem

Hiii
I have developed one Binary file Read/Write Vi.. and then i have convert that vi in to DLL......
Now i tested that DLL Vi it is showing an error No 74. Actually for Binary write i will convert the Input cluster to Flattern to String and for Binary Read i will convert the output to unflattern to string.. I have attached the TEST.vi for reference
Attachments:
Binary Read#Write DLL.vi ‏18 KB
Binary File Read#Write.vi ‏24 KB
TEST.vi.vi ‏31 KB

hi there
if you want to read the size of the string you have to enable the "append array or string size" at the write file function. or you do not append the size and simply read all bytes.
in any case you should replace existing files to avoid remaining bytes of larger strings written in prior calls.
See attachment for details.
Best regards
chris
CL(A)Dly bending G-Force with LabVIEW
famous last words: "oh my god, it is full of stars!"
Attachments:
IO.JPG ‏66 KB
IO_8.5.vi ‏27 KB

Fast processing of mixed representation binary files

Hi Everyone,
I see multiple ways of tackling this but I'm looking for the fastest approach as my data set is very large....
The issue:
I have a binary data file holding 2D data.
It encodes 200+ differnet "columns" that are repeated in time (sampled)
The data contains mixed data representaitons: a mxiture of U8, I8, U16, I16 etc.
They are all regullarly repeated in a known file structure (660 bytes per "line")
I'd like to gnereate the 200+ differnet 1-D arrays form the file each using the correct data representaiton (or a sub-set of the columns).
I can load the file in using binary file read and I specify U8 as the data type . I can then rediension to the correct 2D array.
I'm now stuck on the fastest method to process the columns of data (1-2 bytes wide) into the corect numeric representaiton 1-D arrays (2x U8 to i16 etc.).
Scanning byte by byte would be very slow.
any suggesitons?
Solved!
Go to Solution.

Taking wrote:
Your sequence structures are unnecessary.
I'd bet on Join Number being faster than any string functions.
What sort of mechanism are you going to use for column definitions?
Do you care if 8 bit datatypes get upcast to 16 bit?
Agreed, the sequence structures only present to aid illustration.
I'm not sure flatten to string is a "true" (slow) string function. I'm viewing it more as a container of bytes. I'm going to run some speed tests. The array massaging that has to go on to use the join function may be a large overhead.
Column definitions will be sourced from a secondary text file that describes the file structure. The example conversion of 2 x u8 to i16 would be replaced by a for loop (over all columns of 1-N bytes) and case structure (representation of the column) that processes the data. Ultimately each 1D array of correctly converted data will be saved off to it's own binary data file in a appropriate numeric representation within the case statement.
Next I will be looking what for loop paralization I can achieve vs. source array memory copies. (again it is a very big source data file).

Follow/read a growing binary file

Hello,
Application space:
1 - I have an application that has created and opened a binary file, and is is writing data to it
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try to read the file readonly.
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greetings from the Netherlands

Binary File Reader to a Chart

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