Fstream on a text file and exel data connection breaking

Hello,
I am writing to a text file using C++ code below (VS 2008). Then I do a "Data Connection" from excel2013 to this text file: the purpose of this is to have a "live" display of some graphs based on this log file. Parameters
of the data connection is shown below.
That works fine for some time (a few hours), then for some reason, the log file stops being updated, although the C++ program is still running. No error message displayed.
Same thing happens if my C++ program just ouputs on the console using cout<< and I redirect the ouput in a logfile using the redirect DOS ">".
Anyone has any idea??
It is is so magical to have this live excel view of my batches, I would love to use that! Thanks.
LogFile.open(LogFileName.c_str(), ios::app);
if (!LogFile.is_open())
cerr << "Could not open: " << LogFileName << endl;
else LogFile << "This data" << endl;LogFile.Close();

Does the problem occur when some large file size is reached, such as 2G? The issue can be caused by some limitation of older library (https://connect.microsoft.com/VisualStudio/feedback/details/627639)
or by a limitation of Excel.
If the issue is observed even on medium files, then try analyzing the status of stream (LogFile.bad() etc.) after “<<”. Perhaps it fails occasionally when Excel accesses the file. Check you program when Excel is stopped.

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Supplement: The text file named test.txt doesn't exist before create the fileObj, an instance of File Class.

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Automator - Loop through a text file and process data through a 3rd party software

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Good news and bad news...
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What I'm getting at is that your requirements are pretty simple to implement in AppleScript because you can get 'under the hood' and do exactly what you want, as opposed to Automator's restricted interface.
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set theFileContents to (read file theFile)
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tell application "AppName" to activate
tell application "System Events"
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Here the AppleScript is activating the application and using System Events to emulate typing the contents of the eachLine variable into the process. Put this inside your repeat loop and you're almost there.

Parse text file and retrieve data

Hi,
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here's something to get you started
public void parseFile(File file) throws IOException{
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Reading a text file and using data to plot a graph

Dear Friends,
I have the following problem...
I have a text data looking like this;
100000000
1003ff001
1010013ff
1000003ff
1023fe001
102000000
1023ff3ff
1010013fd
0ff0033fc
0ff002001
0fe3fd3ff
0ff000002
100000000
1003ff001
1010013ff
1000003ff
1023fe001
102000000
1023ff3ff
1010013fd
0ff0033fc
0ff002001
0fe3fd3ff
0ff000002
My Code should have a button , when you click that button it should ask you to choose a txt file to open this file from a specific place. The Indicators of the front panel should show me the ID , Name and Date. The data;
100000000
1003ff001
1010013ff
1000003ff
1023fe001
102000000
1023ff3ff
1010013fd
the first 3 bits belong to X axis, the next 3 bits belong to Y and the rest 3 belongs to Z axis. I have to convert those values to Decimal system, and plot them in a graph, 10 times a second , which means after converting and plotting 10 values , one second is over.
I would aprriciate it very much if you could help me in this case....
Thanks in advance.
Message Edited by Support on 11-13-2007 01:03 PM
Message Edited by Support on 11-13-2007 01:04 PM

Some questions a teacher might ask:
What's the display setting for the "\n" string diagram constant? Why?
Is it better to read the file one line at a time or all at once?
What would you do to be able to stop the chart display before it runs out of data?
What would be different if we combine the two FOR loops into one?
How would you display the header as a multiline string instead of an array of strings?
Why is the scan format %03x instead of %3x? Would it make a difference?
What is the purpose of the two items of the property node?
What would you need to change to plot the data every 50ms? (change in two places!)
Why is the error output of the property node wired to the first FOR loop? (After all, the error value is not really used anywhere there!)
Instead of the two "array subset" operations, we could do it with one icon. Which one? (two possibilities!)
So... be prepared!
Message Edited by altenbach on 10-29-2007 11:31 AM
LabVIEW Champion . Do more with less code and in less time .

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Hi,
While using ArrayList, use add your elements into it
as an object subtype if you do not specify ArryList
certain type.
But recall that if you use certain
type(ArrayList<String>,....), you do not add any
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How can i read the text files and buffer the data in Vector?

hi. I have been running into this problem for days, but with no luck and losing right direction.
The problem is : I am trying to read a text file and buffer the data into a
Queue for each user.
the sample text file is as below:( 1st column is timestamp, 2nd is user_id, 3rd is packet_id, 4th is packet_seqno, 5th is packet_size)
0 1 1 1 512
1 2 1 2 512
2 3 1 3 512
3 4 1 4 512
4 5 1 5 512
5 6 1 6 512
6 7 1 7 512
7 8 1 8 512
8 9 1 9 512
9 10 1 10 512
10 1 2 11 512
11 2 2 12 512
12 3 2 13 512
13 4 2 14 512
14 5 2 15 512
15 6 2 16 512
16 7 2 17 512
17 8 2 18 512
18 9 2 19 512
19 10 2 20 512
20 1 3 21 512
21 2 3 22 512
22 3 3 23 512
23 4 3 24 512
24 5 3 25 512
25 6 3 26 512
26 7 3 27 512
27 8 3 28 512
28 9 3 29 512
29 10 3 30 512
30 1 4 31 512
31 2 4 32 512
32 3 4 33 512
33 4 4 34 512
34 5 4 35 512
35 6 4 36 512
36 7 4 37 512
37 8 4 38 512
38 9 4 39 512
39 10 4 40 512
40 1 5 41 512
41 2 5 42 512
42 3 5 43 512
43 4 5 44 512
44 5 5 45 512
45 6 5 46 512
46 7 5 47 512
47 8 5 48 512
48 9 5 49 512
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50 1 6 51 512
51 2 6 52 512
52 3 6 53 512
53 4 6 54 512
54 5 6 55 512
55 6 6 56 512
56 7 6 57 512
57 8 6 58 512
58 9 6 59 512
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62 3 7 63 512
63 4 7 64 512
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65 6 7 66 512
66 7 7 67 512
67 8 7 68 512
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I already created a class called Class packet:
public class packet {
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}then I wanna to create another Class called Class user which I can create a queue for each user (10 users in total) to store type packet information. the queue for each user will be in the order by timestamp.
any idea and sample code will be appreciated.

Doesn't sound too hard to me. Your class User (the convention says to capitalize class names) will have an ArrayList or Vector in it to represent the queue, and a method to store a Packet object into the List. An array or ArrayList or Vector will hold the 10 user objects. You will find the right user object from packet.user_id and call the method.
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Hi i am new to labview. i want to extract data from a text file and display it on the front panel. how do i proceed??

Hi i am new to labview
I want to extract data from a text file and display it on the front panel.
How do i proceed??
I have attached a file for your brief idea...
Attachments:
extract.jpg ‏3797 KB

RoopeshV wrote:
Hi,
The below code shows how to read from txt file and display in the perticular fields.
Why have you used waveform?
Regards,
Roopesh
There are so many things wrong with this VI, I'm not even sure where to start.
Hard-coding paths that point to your user folder on the block diagram. What if somebody else tries to run it? They'll get an error. What if somebody tries to run this on Windows 7? They'll get an error. What if somebody tries to run this on a Mac or Linux? They'll get an error.
Not using Read From Spreadsheet File.
Use of local variables to populate an array.
Cannot insert values into an empty array.
What if there's a line missing from the text file? Now your data will not line up. Your case structure does handle this.
Also, how does this answer the poster's question?

Compare data from 2 text files and output match

Hi all,
I need some advice.
Firstly in BinaryCode.txt the data is as such:
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the first line in the text file is the header. So I need to check if the names in the second column (BinaryCode0 or BinaryCode1)appear in the Timed_Sets.txt file.
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BinaryCode0,6,40,.........................
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The text files and the VI are attached.
I appreciate your kind assistance in the matter.
Thank You
Regards
kart
Solved!
Go to Solution.
Attachments:
BinaryCode.txt ‏1 KB
compare text files.vi ‏15 KB
Timed_Sets.txt ‏2 KB

If I understood correctly what the output should be then what you basically need to do is to walk through the column in BinaryCode.txt and for each unique value pull out the corresponding rows from Timed_Sets.txt. There's a variety of ways to do this, depending on how much data you have and whether or not you can use any kind of prior knowledge as to the actual file content (such as the names of the keys being searched). Attached is one way. Modify as needed.
Attachments:
compare text files MOD.vi ‏27 KB

Pool data from text file and insert into database

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PE 13 crashes due to incompatible video driver detected. Running on Win 7 SP1 with ATI 540v video card/driver. Deleting bad driver file in adobe program data does not fix the problem, it simply replaces the text file and crashes again. My video driver

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rb
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from
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Message was edited by: Anilkumar Vippagunta

I need to read data from a text file and display it in a datagrid.how can this be done..please help

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[http://java.sun.com/docs/books/tutorial/essential/io/]
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Fstream on a text file and exel data connection breaking

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