Opening and reading a dat file

I have a .dat file on disk that I want to read. Is there a way I can open the file without giving the whole path starting c:/dsfsd/dfs/df/sdfsdf/....

feel slightly wierd asking this since i feel i shud
be knowing but whats "relative path" ???a relative path is the path from where the program is running. For example, let's say you are running in c:\java\bin and your prorgram is in there, and your file is there as well, then the relative path would just be \ thats it.
A better way to understand this is when dealing with HTML Lets say you want to make a link to a picture. Your page is located here : /site/dir1/dir2/index.html and your pictures are stored in /site/pictures/ a way to that without naming the whole site is with relative path. Therefore if you ever wanted to move your site around to another server you wouldn't need to change anything. So for this example, the relative path to, let's say pic.jpg would be ../../pictures/pic.jpg I dont know if this clears anything up. But basically the ../ is telling the computer to go up a folder everytime.
Good luck

Similar Messages

Hi... I would like to purchase a Tablet Sony Xperia Z 2 10.1 (the last one of the Z series) and I was told that Adobe does not support Sony anymore.... I need to be able to open and read Adobe PDF files and I would like to know if this tablet can still us

Hi... I would like to purchase a Tablet Sony Xperia Z 2 10.1 (the last one of the Z series) and I was told that Adobe does not support Sony anymore.... I need to be able to open and read Adobe PDF files and I would like to know if this tablet can still use Flash Player...
Is there anyo who can help me with this? I asked in the shop and I was told "yes of course" , but when I contacted Sony directly I was advised to check with Adobe as apparently in the recent months Adobe and Sony haven't been getting along anymore...

You may be mixing up two entirely different Adobe products.
1. Adobe Flash Player. Needed to view web pages designed with Flash. Not needed to view PDF files. Not available for Android (not just Sony).
2. Adobe Reader. Reads PDF files. However, the Android can also read most PDF files without needing Adobe Reader.

Open and read from text file into a text box for Windows Store

I wish to open and read from a text file into a text box in C# for the Windows Store using VS Express 2012 for Windows 8.
Can anyone point me to sample code and tutorials specifically for Windows Store using C#.
Is it possible to add a Text file in Windows Store. This option only seems to be available in Visual C#.
Thanks
Wendel

This is a simple sample for Read/Load Text file from IsolateStorage and Read file from InstalledLocation (this folder only can be read)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.Storage;
using System.IO;
namespace TextFileDemo
public class TextFileHelper
async public static Task<bool> SaveTextFileToIsolateStorageAsync(string filename, string data)
byte[] fileBytes = System.Text.Encoding.UTF8.GetBytes(data);
StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
var file = await local.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
try
using (var s = await file.OpenStreamForWriteAsync())
s.Write(fileBytes, 0, fileBytes.Length);
return true;
catch
return false;
async public static Task<string> LoadTextFileFormIsolateStorageAsync(string filename)
StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
string returnvalue = string.Empty;
try
var file = await local.OpenStreamForReadAsync(filename);
using (StreamReader streamReader = new StreamReader(file))
returnvalue = streamReader.ReadToEnd();
catch (Exception ex)
// do somthing when exception
return returnvalue;
async public static Task<string> LoadTextFileFormInstalledLocationAsync(string filename)
StorageFolder local = Windows.ApplicationModel.Package.Current.InstalledLocation;
string returnvalue = string.Empty;
try
var file = await local.OpenStreamForReadAsync(filename);
using (StreamReader streamReader = new StreamReader(file))
returnvalue = streamReader.ReadToEnd();
catch (Exception ex)
// do somthing when exception
return returnvalue;
show how to use it as below
async private void Button_Click(object sender, RoutedEventArgs e)
string txt =await TextFileHelper.LoadTextFileFormInstalledLocationAsync("TextFile1.txt");
Debug.WriteLine(txt);
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FYI TDMS open and read on empty file gives no error's out

I found that if you 'open' an empty (0 byte) file using TDMS open, you will not get any error messages when you open it, nor when you call functions such as "Get properties" or "List content", also no error when you close the TDMS file.
If the file is non-empty, but not a valid TDMS file, TDMS open returns an error.
I would have expected that I would get an error or a warning at least when trying to read a non-existant property or group, if not by the open function itself?!
The 2013 snippet below creates a 1-byte or empty file in the local user temporary folder, closes the file, then attempts to open and read it as a TDMS file. The temporary file is deleted afterwards.
If the file is empty, NO errors or warnings occur at any point. If the file is not empty, it fails on the TDMS open. (Note the sequence structure is because the path out of the tdms close is invalid if the tdms open failed.
This could conceivably cause an issue if your program does not do additional fault checking to catch existing but empty files. (Which of course shouldn't ever happen, but in some situations it could happen.)
QFang
CLD LabVIEW 7.1 to 2013

Hooovahh
I asked to list the channels in a named group. If that named group did not exist, I would think that should at least be a warning, but I could see how it should not be an error, it was just unexpected to me that reading a non existant group (in an empty file) did not indicate any issues at all. To me, 'error out' should give a warning or an error if something unexpected happened, but I may just have stricter opinion on something that by nature is very philosophical and open for debate. (And there are always tradeoffs, overt checks and bounds in a function obviously leads to overhead, and TDMS is optimized for performance, so that may be one reason it is the way it is.)
(This situation came up for me because when a file is first created, we datetime tag it and write a bunch of other meta-data to the file, then later (and over time) we add the spectrum goup + data. [Edit] actually, in the old code, if the file existed, it was assumed to have been setup correctly. so if the group exists, the old code assumed all the meta data has already been written [end edit].. One of the many fixes possible, I'll rely on the 'found' boolean output of the parameter read instead of relying on the error/warning. If the datetime tag is found, the code will asume the file exists and has been filled with the meta data I expect.)
Thoult :: I wasn't sure, but in either case, my intent was to provide extra information, not 'knock you' for participating in the discussion, I hope thats not how I came accross. English is a second language to me, so I sometimes come across 'wrong' from what I mean.
QFang
CLD LabVIEW 7.1 to 2013

How to open and read an external file in Dashboard widget?

I am new to Dashboard widgets and also Javascript. I have written a widget that needs to open and read a file on the local file system. I have searched a lot and have not found any documentation or reference on the internet as to how to do this.
I know it can be done since there is a checkbox in the widget attributes that says "Allow External File Access".
can anyone help me out here?
Thanks

You need to define the AllowFileAccessOutsideOfWidget key to Yes.
You also need to define the AllowFullAccess key.
You may also need to define the AllowSystem key (to Yes of course).
Mihalis.
PS. If you cannot find any other documentation please check http://widgetbook.blogspot.com.

How to open and read many files from a directory and store contents in 2D array?

I want to make a VI that opens and reads the data from various files contained in a directory (200 files each with 2 columns) and store these in a single 2D array. For file number 1 I want to store the data from both columns in the 2D array, but for files 2 to 200 I only want to store the second column of each file. Can someone please help?

Hi Nadav,
Thanks for your help. I have followed your instructions but i cannot get it to work. I used the LIST DIRECTORY to list the files in the directory - that works. However, how do I read each of the 200 files using READ FROM SPREADSHEET FILE without me having to manually select each of the 200 files? So, if I use LIST DIRECTORY to list all 200 files in an array, how do I get each of these to open and store the data in a 2D array? Here is what I have done (File called read_files.VI) Could you please help me? Thank you very much in advance.
Attachments:
read_files.vi ‏18 KB

"Error 1 when trying to open and read datalog file from several subVi's

So, I've been coding up this model based controller and have hit a snag:
The program starts and opens a datalog file and passes the refnum to two loops.
At a regular time interval (every 2 minutes), one loop (that's iterating once per second) writes the current information to a datalog file.
Meanwhile, another loop (that's iterating continuously) checks to see if the file is big enough to support training of the model, if it is, then the training process begins. Once this happens a period of recent information is read from the file. Initially, this read would fail and return 0 data. However, this problem was fixed by passing in the data file path rather then the refnum and having the vi open,
read, and close the data file. With the path, the vi was able to read all the data. However, still in the same loop, another vi downstream tries to read the file and returns error code 1, and no data is read. I tried passing that vi the path and seeing if it made any difference to open, read and close the file. But even then the read failed (with error code 1).
I don't understand why it can read in one vi and not the other!
Does anyone know what is going on here? It seems that semaphores would probably solve the problem, but would prefer a simpler solution. Thank you very much.

Try passing the data to the continuous loop through a LV2-style global. That way you are only access the file in one place. But then that begs the question, if the data is passed internally, do you really need the file at all?
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

How to make VI wait until data is saved before it can open and read data

I have developed two VIs for continuous monitoring. First VI is for acquiring raw strain data and saving it into a folder, let's say, every 10 minutes or every 100 Mbyte of data (for example, after monitoring for an hour, the folder will have 6 files, each of which contains 10 minutes of data). Second VI is for opening/reading/processing data files collected by the first VI. Right now, this second VI can handle only one file at a time. What I am trying to do is to have this second VI open the files one after another automatically. Also (here is what I think will be difficult part), I want the second VI recognize that a file is saved by the first VI before opening it (i.e., wait until the first 10 minutes of data file is saved by first VI, open and process this first data, wait until the second 10 minutes of data file is saved by first VI, open this second file and process it, wait until the third 10 minutes of data file is saved by first VI, open and process it........). Any help or comments would be appreciated.
Thanks in advance for your help.
Brdg.

Basically, If your purpose is to keep one thread from opening the file until the DAQ thread has finished with it, then the queue is what I would use.
All functions are on the ADVANCED | SYNCHRONIZATION | QUEUE palette.
Use the OBTAIN QUEUE to create the queue. Set the DATA TYPE to a PATH constant. This creates a queue of paths.
Pass the QUEUE REFNUM to both the DAQ VI, and the PROCESSING vi.
In the DAQ VI, when you write a file, take the PATH from the CLOSE FILE function and use ENQUEUE ELEMENT to put it into the queue (use the refnum you passed in).
In the processing thread, use DEQUEUE ELEMENT to fetch the path from the queue. You probably should use a timeout value of 1000 mSec or so. If you timed out, go check your PROGRAM RUNNING flag (so you can stop without waiting forever on the queue), and if you're not stopped, try again.
If the DEQUEUE ELEMENT returns WITHOUT a timeout, then open the path it gives you - the file is guaranteed to be closed, since you closed it before you enqueued it.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

How can i open the directory/folder and read all the files inside it in order and then close it?

How can i open the directory/folder and read all the files inside it in order and then close it? any example would be nice.
thanks

In the File I/O>>Advanced File Functions Palette is a function named "List directory". This function will give you two arrays. One contains the names of all subdirectories the other the names of all files. If you want to sort them by name use the array sort function. If you want to sort them by another attribute use the File/Directory Info function to get more data. Use a cluster which contains the attribut to sort and the original index of the name. Then sort this array.
Waldemar
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
Don't forget to give Kudos to good answers and/or questions

How to open and read pdf and micrsoft word (.doc) files or documents

My problem is how to use my BB 9800 software version 6.0.0.546 to read/view pdf files and microsoft office documents. I have also bought documents to go from online and have installed it on my phone, but whenever i try to open it I receive a message that it is incompactible. Any help will be greatly appreciated.

Hi, Sammy.
Why not install a 3rd party PDF reader and Word Doc reader to help open and read pdf and micrsoft word (.doc) files or documents? You can google it and select one whose way of processing is simple and fast to help you with the related converting work. It will be better if it is totally manual and can be customized by users according to our own favors. Remember to check its free trial package first if possible. I hope you success. Good luck.
Best regards,
Arron

How to open and read binary files?

How do I open and read Binary files?

Did you look on The Unarchiver's web site where it has a link to older versions? http://theunarchiver.googlecode.com/files/TheUnarchiver3.2_legacy.zip
The best thing to do is ask your friends what programs they used to produce these files, or at least what format files they are producing. Otherwise it's like being shown a car and given a bundle of 200 keys with no idea to which one to use, or even if any of them work with that car.
Using The Unarchiver will likely not do anything because it too will not know what format files are involved, and they may not even been in an archived format. If they sent you a Word file without telling you (a favorite of Windows users to do -- it drives me crazy when they could have just sent them in plain text), The Unarchiver won't open them. If it's a picture file then using Hexedit will just show you a bunch of unintelligible stuff as shown in an earlier post, though you may see a line of text providing a hint.
As I said earlier, often .bin may be an executable program which needs another program to actually interpret it. That's what Java is trying to do. Still, it may think it can execute the file, but it is highly unlikely somebody would send you an executable program (and if they did I would not trust it). For all you know it may be a Windows virus.

Hi,how can i change the default settings on my adobe readerX1 such that it will display all my pdf files according to their individual cover pages (as cover picture thumbnails)before i click them to open and read........i really enjoyed this feature as a

hi,how can i change the default settings on my adobe readerX1 such that it will display all my pdf files according to their individual cover pages (as cover picture thumbnails)before i click them to open and read........i really enjoyed this feature as a default settings upon installation in previous editions of adobe reader .i use a windows 8 pc now.thank

For sideloaded content the nook pulls the metadata from ePub file itself. I would suggest looking at a program like Sigil or Calibre that will let you edit the metadata in the book to make it appear like you want.
For the PDF vs ePub - No, that's the way PDFs work (think of them as graphics, not text), wheres ePubs are Web Pages - so no you can't them to behave exactly alike without converting the files.

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 .

Writing the file using Write to SGL and reading the data using Read from SGL

Hello Sir, I have a problem using the Write to SGL VI. When I am trying to write the captured data using DAQ board to a SGL file, I am unable to store the data as desired. There might be some problem with the VI which I am using to write the data to SGL file. I am not able to figure out the minor problem I am facing. I am attaching a zip file which contains five files.
1)      Acquire_Current_Binary_Exp.vi -> This is the VI which I used to store my data using Write to SGL file.
2)      Retrive_BINARY_Data.vi -> This is the VI which I used to Read from SGL file and plot it
3)      Binary_Capture -> This is the captured data using (1) which can be plotted using (2) and what I observed is the plot is different and also the time scare is not as expected.
4)      Unexpected_Graph.png is the unexpected graph when I am using Write to SGL and Read from SGL to store and retrieve the data.
5)      Expected_Graph.png -> This is the expected data format I supposed to get. I have obtained this plot when I have used write to LVM and read from LVM file to store and retrieve the data.
I tried a lot modifying the sub VI’s but it doesn’t work for me. What I think is I am doing some mistake while I am writing the data to SGL and Reading the data from SGL. Also, I don’t know the reason why my graph is not like (5) rather I am getting something like its in (4). Its totally different. You can also observe the difference between the time scale of (4) and (5).
Attachments:
Krishna_Files.zip ‏552 KB

The binary data file has no time axis information, it is pure y data. Only the LVM file contains information about t(0) and dt. Since you throw away this information before saving to the binary file, it cannot be retrieved.
Did you try wiring a 2 as suggested?
(see also http://forums.ni.com/ni/board/message?board.id=BreakPoint&message.id=925 )
Message Edited by altenbach on 07-29-2005 11:35 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Retrive_BINARY_DataMOD2.vi ‏1982 KB

How to read a data file combining strings and data

Hello,
I'm having a data file combining strings and datas to read. I'm trying to read the filename, time, constants and comments into four seperate string indicators (the lines for the comments varies for different files). And read the data into a 2-D numeric array. How can I do this? Is there any function that can serch special characters in the spreadsheet file so I can exactly locate where I should start reading the specific data. The following is how the data file appears. Thank you very much.
Best,
Richard
filename.dat
14:59:00 12/31/2009
Sample = 2451
Frequency = 300, Wait time = 2500
Temperature = 20
some comments
some comments
some comments
some comments
some comments
7.0000E+2    1.5810E-5
7.0050E+2    1.5400E-5
7.0100E+2    1.5500E-5
7.0150E+2    1.5180E-5
Message Edited by Richard1017 on 10-02-2009 03:10 PM
Solved!
Go to Solution.

Hi,
     I'm fairly new to the NI forums too and I think you just have to wait longer. Your post was done right. I do a similiar function as to what you are talking about except I read in numbers from a file. I create an ini file (just a notepad file of type *.ini) that is is set up with sections inside brackets [] and keys with whatever name followed by an = sign. You may be able to use a *.dat file too, I just haven't. Then the vi attached goes to that file and reads the keys from those sections. You just repeat for the different sections and keys you want to read. You can use similar provide VI's to write to that same file or create it. Let me know how that works.
Attachments:
Help1.ini ‏1 KB
Help1.vi ‏10 KB

Opening and reading a dat file

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