Writing binary file for fixed amount of time

Hello, I'm trying to write a binary file of multiple channels for a fixed amount of time before I perform my analysis. Does anyone know the best way to accomplish this?

Here is an example of one way to do what I think you are trying to do. There may be a more elegant way of doing it, but this is pretty simple and straight-forward. It basically writes a 5-integer array for 5 seconds and then stops. Let me know if you have any questions.
Attachments:
timed write.vi ‏27 KB

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Writing a file for prescribed amount of time in a while loop after the triggering condition is met

Hello Guys,
I am trying to program an application in which if the trigger condition is met it should start to write the file.
I was able to do that, but if I want it to be written for certain amount of time, and once the trigger condition is met, it should continue to write the files for prescribed amount of time. I was not able to do this. The file name should also be updated accordingly.
I tried to with some options by keeping the creation of the file outside of the loop, if I do that then if the trigger condition is not met it will stop writing and I dont want that, as once the trigger condition is met it should be true thereafter.
So I cant keep any thing outside the while loop, bcaz then it checks the condition of the shift register for the trigger and I have it as a false constant.
I am attaching my application which is kind of mess and I have written in the application where I am having problems. For every iteration of while loop it makes a new file, and i dont want that, I want to write specific amount of time data to the each file.
Please take a look at my code and help me in solving the problem. Any insights and examples on how to do this thing will be a relief to me.
Thanks in advance.
Regards,
Nitin
Attachments:
PXI_4462_Sync_and_Stream_trigger.zip ‏192 KB

what i am saying is to keep track of how much data you have written and whenever you need to make a new file you make 1.
here is a vi that i just made that should show you. let me know if you need any help understanding it.
Attachments:
new file exemple.vi.zip ‏21 KB

Memory issues writing binary files, using a subVI to do all File Handling, topVI, when run normally files are way too large.

Problem writing binary files with LV 8.5. I have one VI that does all the interaction/file I/O and another VI for testing. I find when I run the subVI where all the data reading/writing is happening with break points and single stepping through the code all is OK, but when I run normally the files are much larger than they should be and as well when I close the files I get a error. Any insights?
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Waltz wrote:
I found the problem, I was actually trying to close the files twice.
I don't see how this could cause the symptoms you described in the first post.
(It only explains the error on close).
LabVIEW Champion . Do more with less code and in less time .

Is there a way to create a custom screensaver with pics/slides that display for different amounts of time?

Is there a way to create a custom screensaver with pics/slides that display for different amounts of time? Or even add a "video slide" into the screensaver?
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Welcome to the Apple Community.
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hello everyone.
i'm new to jmf and i have been reading a bit about it. so i tried the sample code at: http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/JpegImagesToMovie.java (THIS WAS VERY HELPFUL)
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>
i'm new to jmf ..>The [JMF forum|http://forums.sun.com/forum.jspa?forumID=28] is the best place to ask JMF related questions, but I am guessing you are also new to Java, and to programming, so this forum might be best for the moment.
>
..and i have been reading a bit about it. so i tried the sample code at: http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/JpegImagesToMovie.java (THIS WAS VERY HELPFUL)
this program displays each image for 1 second each.
now my problem is, i want to display these pictures for different amount of time... for example: display pic1 for 1 second, then display pic2 for 3 sec and so on.>Well.. given a run of [JpegImagesToMovie.java|http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/JpegImagesToMovie.java ] might go..
java JpegImagesToMovie -w 400 -h 300 -f 1
-o the.mov pic1.jpg pic2.jpg pic3.jpg..you might instead try..
java JpegImagesToMovie -w 400 -h 300 -f 1
-o the.mov pic1.jpg pic2.jpg pic2.jpg pic2.jpg pic3.jpg
Lines broken for clarity. Instead have command all in one line.
This simply repeats the second frame, three times. The .MOV format might 'optimize away' the second and third frame from the final file, but I would not count on it.
Of course, a far better way to animate images (with transition effects, full control over time, and all the bells and whistles) is to load the images into memory and create the slide show using the Java 2D abilities, mostly found in the Graphics class.

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Hello All,
I have a requirement, where in I would want my activity in the workflow to wait for an indefinite amount of time. Then when a certain activity occurs, I would like to complete the 'waiting' activity.
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Luiz,
Lets say I have the following:
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\ Yes
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Images disappearing when on another tab for any amount of time.

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Is the disk cache and memory cache enabled and working if you check that on the about:cache page? (open this page via the location bar)
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
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I've got a fair amount of Java experience, enough to know what I'm doing most of the time but I do have a vast experience with C & C++ which helps my Java. I've stumbled across a problem when trying to write out files in binary.
If I was to write out a binary file, I would always choose C/C++ to do this because simply because I'm at ease with the implementation.
I've now written a Java program which needs to output a file in binary and I'm having real issues doing the most simple things because of no unsigned support.
I want to write out elements byte-by-byte and make use of the 8-bits provided in the byte type in Java.
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Whether a byte is signed or unsigned only matters if one is doing arithmetic on it. If the int is 0-255 then you just cast to a byte using
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Read binary file 10 bytes at a time

I want to read binary file in a specific format. There is a number at the starting of the file. That tells us where the data is starting. Suppose it says 3975, then it mean data starts at 3975. Then once I read that location I want to read data at 10bytes at a time and then convert it to numeric and display it on graph. I am attaching the file format and the current vi which I am using. please help.
Solved!
Go to Solution.
Attachments:
topo.zip ‏89 KB

Ah, the first 10 characters are a string!
After opening the file, use the Read From Text File with count set to 10. Then use the Decimal String to Number to convert this string into your "record size".
NOTE: The text indicator was just for debug purposes. You don't really need it.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
Read record size.png ‏12 KB

Display for variable amount of time?

Any thoughts on how I might accomplish the following:
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Is there a me
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or
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Suggestions???

Sorry I lost part of the post:
Is there a method in Captivate to wait a period of time, and if so just set a conditional loop to show an object, wait the time, and then hide? I am figuring that there is not, so my three other plans of attack...

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I am sampling two channels in continuous mode using labview basic version. I would like to take the two arrays of values as I am sampling them and write them out in block mode to a binary file. What's the best way to do that?

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Snap8.gif ‏8 KB

Writing binary file - random places

Hi,
I want to write to random places inside a binary file using powershell.
something like a function write(position,value)
Original file content "0123456789"
write(1,2) -> file is now "0223456789"
write(6,2) -> file is now "0223452789"
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With kind regards,
Maurice Lucas

The example is text. You cannot write to a binary file using text.
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A binary file has only 1s and 0s. They may look like hex in a binary editor.
See:
http://msdn.microsoft.com/en-us/library/d3wke8tz(v=vs.110).aspx
Binary is written to by byte position and buffer length.
¯\_(ツ)_/¯

Writing binary file for fixed amount of time

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