Is this Legit way of saving data?

Hello
Is it ok to save a file in two different ways for ease of parsing? For example saving a file as CSV so that excel could read it, and also saving the Objects(ser file) at the same time so that you could load it in an easier fashion. Is this bad form of programming and should just save as one file format? or is it OK and makes no difference.

oplead wrote:
I see. Then i am really stuck now. Let's say i have lots of data in this form saved as a CVS:
<<----|Comments Section|---->>,<<----|Comments Section|---->>,2,6,4,1,
,,3,7,5,2,
,,,8,,,
,,5.0,9,20.0,3.0,
,,,30.0,,,I need to parse this in a way so that it would be like this [[<<----|Comments Section|---->>], [<<----|Comments Section|---->>, , , , , ], [2, 3, , 5.0, , ], [6, 7, 8, 9, , 30.0], [4, 5, , 20.0, , ], [1, 2, , 3.0]]
Would parsing be faster or saving two different files at the same time if the size of data increases? And how hard would it be to make sure that have "a strategy to cope with the files being out of sync."
Also I might as well learn how to parse now, what do you think is the best way to parse the data? Do i need to use complicated pattern matching?
Thank youI've used SuperCSV to good effect in the past... it's an overengineered library for the majority of "common CSV parsing situations", but it's also nice to have all that flexibility at hand if/when it's required in the future.
... And I also think it's a nice demonstration of many OO design patterns... bet let's not go there...
Cheers. Keith.

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2) the data is removed from the beginning of the file
3) the data that is written is not lost of the program crashes/etc.
4) the whole logging business is not too expensive
Any suggestions?
Thanks,
Chuck.

Here's what we did at my last job:
Incoming messages are logged to disk via FileOutputStream (maybe with BufferedOutputStream encasing that, I don't remember) this outputstream is not closed until the applet is stopped. System.out is also reassigned to this fileoutputstream to capture all messages.
At the same time, there is an InputStream reading from that file. As data is read, we stick the text into a TextArea.
When the TextArea size hits some certain amount (maybe 20,000 characters) we'd remove ... maybe 5000 from the top. Log stays the same tho
When the day rolls over, we switch log files
You're questions:
1) the data is appended to the end of the file (easy)
Yes. But if you're not using streams, you should check that out.
2) the data is removed from the beginning of the file
That's pretty easy. Open the file for reading, open a new file for writing. Read the first n bytes but don't write them. Then write the rest
3) the data that is written is not lost of the program crashes/etc.
Data should be fine if it's logged to disk
4) the whole logging business is not too expensive
Saving to disk isn't very expensive at all. In fact, normally writing to disk is slow enough that stuff just gets put into a buffer somewhere to get sent to the disk and the processor goes on with the program.

Form once saved, data is disappearing on the offline form!

Hello
I am lauching my_form on IE browser on the 3/4 of the screen of GUI (Graphical User Interface of SAP), on the rest of the screen i put some GUI push buttons for SUBMIT (am not using Adobe's SUBMIT button). By chance if user forgets any mandatory field populating, then am throwing a GUI popup message, then the user closes this popup message, well, but
1) User can see physically data presenting on the form, but when user SAVEs the form by pressing Adobe's SAVE button.....the SAVEd copy on the local PC does not holding any data! all the form is blank
This is happening if popup comes up and user closes it
Pls. let me know how can i fix this issue that the form must retail the entered data all the time irrespective of popups
Thank you

Thank you. Sorry my original question is confusing, i will put it in the below way instead,
1st scenario:
I am launching 2 pages my_form on the IE browser, am entering data on first page, at this point i saved it on my laptop, it saved properly and when i checked the saved copy (offline copy) its holding all the entered data, well.
Now, the issue is,
2nd scenario:
I am launching my_form, am entering data on first page, at this point I SUBMITted the form (am not using Adobe's SUBMIT button, i have my own custom SUBMIT button outside of Adobe),
2A) Say, there is some errors (example, formatting, madatory fields not fillled, cross-depenedency validations failed)..... my application (its not adobe, i have my own custom application) is throwing some message
Now, user can see the entered data on the form physically....if user saves at this point, then, the saved offline form not holding any data
2B) Say, its successfully submitted, then my aplication (its not adobe, i have my own custom application) is throwing a message saying that "Successfully submitted" via Popup
Now, user can see the entered data on the form physically....if user saves at this point, then, the saved offline form not holding any data
Issue is coming when messages are throwing...i guess at this point some stuff/memories/nodes/fields/variables are clearing/loosing its data
Thank you

Best way to read data sources in parallel

Hi,
I'm looking for conceptual help as I start a project. I am trying to figure out the best way to get data from several sources at different timings and deliver them to a main vi.
I have 4 systems, which each work well on their own (OK, one doesn't work yet, but let's assume that can be fixed
One system reads from 2 pH meters on serial ports. The meters are slow to respond, so it takes about 2 minutes to read 4 channels of data. I save these data to a file every 10 minutes
One system reads from a CO2 meter on the USB port. It reads the data every second, and does some averaging. Every 2-10 minutes, it saves the average to a file and then sends a command to the parallel port to switch the input to the meter.
The third system reads from 6 valves, each on a serial port. These also take time, probably several minutes to poll all 6. These data will also be saved to a file.
The 4th system reads a bank of temperature probes on the USB port. These get polled every few seconds and saved to a file every few minutes.
Now that these individual routines are working, I am trying to create a front end that will display all the data in one place and allow me to set all the parameters from a single place. I would also like the possibility of using the data from one source at another place (for instance, having the output of the temperature probes sent to the pH meters to adjust their calibration). At this point, I get confused as to the best way to proceed.
It seems like if I just want to read the data from each source, I could simply put all 4 routines together in a single vi (oh, what a mess that would be to read). Maybe I should start this way?
However, if I want to have any communication between the different data sources, it seems like I will either need to use queues or VI server. I sort of envision a vi that lets me configure the various ports and the file operations and then can turn on monitoring of any or all of the various inputs. Each of them will do their thing at their own time and the main routine will simply display whatever data they deliver whenever they have new data. Fortunately, nothing is particularly time-critical, nor does it need to run fast.
My questions: Am I correct in how I'm thinking about getting this to work? Is there a clear choice between queues or vi server? I've looked at several examples of each, but without having done something like this before, it is hard for me to tell which is better.
Thanks for any suggestions.
mike

Hi Mike,
I think that you are on the right track with your thinking process. You might be able to implement this using queues. I'm not exactly sure how you would do it with VI server since it is just a set of functions that allows you to dynamically control front panel objects, VIs, and the LabVIEW environment. However, there are some great resources available with using queues for this type of application. I'm including the link to another discussion forum that had a very similar question to yours. There is a good example of using queues within this forum post. Also, there is a great example in NI Developer Zone about using queues and some other good ones in the NI Example Finder (just search 'queues' and you should get a few results). I hope this helps!
Carla
National Instruments
Applications Engineer

Is this Legit way of saving data?

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