Reading from a file doesn't work...
Hi All,
I am tring to read from a file tickets.txt and when I do this
BufferedReader inFile = new BufferedReader (new FileReader("tickets.txt"));
StringTokenizer tokens = new StringTokenizer(inFile.readLine(), ":");StringTokenizer throws a null pointer exception... and I couldn't work out why... so I did this in between BufferedReader and StringToken
System.out.println(inFile);And it printed this on the screen... which is not in my file...
java.io.BufferedReader@1c78e57
Please Help,
Mike
C:\Program Files\Java Studio_JDK\s1studio\bin
is what it prints... which is not where my file is...
but it created a file there ... and I added stuff to the new file I found and it still prints null?
some of my code...
PrintWriter pw = new PrintWriter (new BufferedWriter (new FileWriter ("tickets.txt")));
BufferedReader inFile = new BufferedReader (new FileReader("tickets.txt"));
System.out.println(inFile.readLine());
BufferedReader stdin = new BufferedReader (new InputStreamReader(System.in));thats all in the main and thats all that really has anything to do with tickets.txt right now... everything else is commented out for now...once I manage to read the file then I will uncomment it...(the methods and stuff)
Thanks,
Mike
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Hello,
I try to read a Binary File from SD-Card on my MCB2400 Board with LV2009 Embedded for ARM.
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Solved!
Go to Solution.
Attachments:
SD_Card_Read-test.vi 12 KBHello,
thank you for your Help.
But I just want to read a Binary File, which is build by another program. And this is coded with 8Bit (like a normal Binary File) and not just with 7Bit (ASCII). So the workaround doesn't work in my case.
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Message Edited by aminat on 09-30-2009 03:28 AM -
Create AAC from Wav file doesn't work
I've converted many WAV files to AAC and it worked fine. The last few times I've tried it it isn't working. I hear the bleep which I think indicates it's been converted but I can't find it anywhere so assume it didn't happen.
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Problem with reading from bin file into Vector
What am I doing wrong? It works fine to write the vector to the bin file and then read from it. But if I try just to read from the file it wont work.
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import javax.swing.*;
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s3 = new Spelare("Sanja", 80 );
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s8 = new Spelare("Pelle", 30 );
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}Because what you are writing to the file is a vector, that is all you can get out. You are actually reading a single Object from the file which you can cast to a Vector, from which you can access the data stored inside. If you want to read the Spelare instances from the file, you will have to save them individually to the file. You will have to implement Serializable and look up the API to do that.
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Read From Measurement File doesn't work
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Attachments:
Profile.xls 6 KBJeff B,
Sorry for the delay, I have been travelling for a couple of weeks. I took a look at the profile and your are right, it was modified incorrectly. When the data are taken and stored as a CSV file using Write to Labview Data file, the program always sets the sample number to 1 because it is being called to append one sample each time through the timing loop. Since the number of samples is wrong, I was modifying the number aftewards to get the read to work. After your comment, I used jedit to modify it rather than excel and it worked. I could change the program to store the data only once after the run is finished to eliminate having to mess with the data. I don't know how else to fix it.
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LabVIEW for ARM 2009 Read from text file bug
Hello,
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Wouter.
"LabVIEW for ARM guru and bug destroyer"I have another solution, the EOF works with this one.
the cnt is the bytes that are not read yet, so the first time it tries to read (and allocate 4 MB).
you only want to say that if it's in line mode and cnt > 256 (BUFINCR) cnt = BUFINCR
the next time cnt is the value of the bytes that are not read yet, so the old value minus the line (until CR LF) or if cnt (256) is reached.
with this solution the program does not try to allocate the whole file but for the max of 256.
in CCGByteStreamFileSupprt.c row 705
if(linemode && (cnt>BUFINCR)){
cnt = BUFINCR;
don't use the count input when using the vi in line mode. count does not make sense, cnt will be the total file size. also the output will be an array.
linemode seems to be the value of the file size but I checked this and it is just 0 or 1, so this is good
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I am trying to read text in from a text file. This is the exact code I am using. For some reason the output from 'read from text file' contains all the text that was originally in the file, but after the code executes the file is empty. I have several other vi's which use the same code and the file is fine. But whenever I run this code in this one specific vi the text file gets erased.
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During one of our tests, two instruments were switched at the terminal by accident. I need to read in the massive lvm files, remove the wrong scaling and apply the correct scaling, while switching the values in the columns and right it all to new files. Simple right?
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I am attaching my VI and a small data file to be analyzed. You can see what I mean.
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This means that I have to use the read from text file, read how ever many characters I think a row is (over estimating a bit) then search for the newline character, find out how many chars are in that set and then offset that for the next loop iteration, all while converting each string number to a double. Talk about slow.
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[will work for kudos]
Attachments:
Scaling Factor Correction.zip 1109 KBThat is a great workaround. The help talked about putting a check next to "read lines" but for the life of me I couldn't find where to do that. I wonder what other VIs have mystery check options in the right mouse click menu. I mean normally options like those are inputs, I thought. I'm going to start right clicking on every VI I drop to see if there are options there I never realized.
I would still have to use the set file position VI and specify the byte offset right? How would I know where that is? I guess each character is a byte and I would count the characters in the string retrieved and then offset by that amount on the next iteration using a shift register?
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[will work for kudos] -
Read from measurement file (wrong values)
I have a VI where I save data using the ''Write To Measurement File utility''. When I open the .lvm file in the note pad I can see all the data correctly, but when I use the "Read From Measurement File" tool and try tho make a graph the data shown is not correct. Attached the .lvm file and one image of the chart that labview made using the "Read From Measurement File". If you open the lvm in the notepad you can see that the time column goes up to 22 sec. In the chart the time axis goes only up to 7,5 sec. What is going wrong??? Thanks
Ps: I changed the file .lvm to .txt to attach
Solved!
Go to Solution.
Attachments:
Chart.jpg 688 KB
teste.txt 156 KBvitor22 wrote:
I tryed.
And how did it turn out? Saying I tried and not saying how it didn't work doesn't help me help you.
I was able to do it. But the X data wasn't correct. That is because your timestamps aren't regular spaced. So you can't use a waveform graph.
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Read from one file ... and write
I had written below code to read from a file
which has input in below format...
$ filla
% dillla
I wrote a code to read from the below file and I want to write into another file...
in another format...like
filla, $
dilla, %
I wrote as below... but my code doesn't work....i commented most of the code becoz I doubt ....
I read the file...line by line...
each line has two words one is special characters($ or %) and the other is some name... separated by space..
I stored both in different arrays...and thought to write them in output file...
import java.io.*;
public class data
public static void main(String args[])
int kMaxLines = 60000;
String[][] valuePairs = new String[2][kMaxLines];
String symbol [] = new String[kMaxLines];
String name [] = new String[kMaxLines];
int k = 0;
try
FileInputStream fstream = new FileInputStream("c:/inputs.txt");
DataInputStream datastream = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(datastream));
//FileWriter output = new FileWriter("c:/output.txt");
//BufferedWriter bw = new BufferedWriter(output);
String names;
String strLine;
int line = 0;
while ((strLine = br.readLine()) != null)
String temp_strs[] = strLine.split(" ");
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valuePairs[j][line] = temp_strs[j];
//System.out.println(temp_strs[0] + " " + temp_strs[1]);
symbol[k]= temp_strs[0];
name[k]=temp_strs[1];
line++;
k++;
for (k=0; k < kMaxLines; k ++)
System.out.println(symbol[k]+ "" + name[k]); // when I print it is giving null value...
} // so what I do to get those values into global array...
datastream.close();
// to write to file
//String names_str;
//bw.write("@relation train");
//for(k=0; k<kMaxLines; k++)
// names_str = names+""+name[k];
//bw.write("@attribute names" + " {"+names_str+"}");
//bw.write("@attribute class {+,-}");
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// for (k=0;k<kMaxLines; k++)
//bw.write("name[k]+","+symbol[k]");
catch (Exception e)
//file not found exception...
e.printStackTrace();
Why the multiple arrays?
I'd just read it into List<String[]>... an extensible collection of "the fields on each line"... then you just write them out as required.
second-field + comma + first-field.
I suggest your next move should be to take a backup copy of your current class then rip-all that commented-out code out of it, and reformat it properly... starting from a clean(er) slate... then try swapping over to a List<String[]> instead of that cumbersome String[][] matrix.
Try that... if you get stuckeroonied then don't be afraid to ask again.
Cheers. Keith. -
Regular expressions read from a file?
Hello,
I'm trying to read a bunch of string literals from a file, and then replace their appearances in another string. It works, except when I have special characters in the file, like this:
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EOF detection in "Read From Spreadsheet File"
Hi folks, I need help in detecting EOF in a "Read From Spreadsheet File". I' d like to stop a while loop by wiring the EOF? indicator to the stop condition, but this doesn't work. For design resons I can't substitute the while loop with a for loop and I DO need the while loop. I read something about creating custom EOF detection but I'm wondering why the builtin function in the vi doesn' t work and if there isn't some simple solution. Many thanks, hazibuli
I'm guessing that you want to process one line at a time from the spreadsheet. Use Read From Spreadsheet File to read in the entire spreadsheet as Dennis says. Then wire the 2D output to a For Loop with indexing enabled. Each iteration of the For Loop will allow you to process one line at a time. When the last line is processed, the For Loop will exit automatically. Here is an example to get string length of each element in a spreadsheet. Message Edited by tbob on 03-15-2010 09:46 AM
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UPDATE : Toshiba Recovery Wizard 'cannot read from source file or disk' error (satellite L500)
UPDATE 2: Phoned Toshiba tech support again, guided by techie to begin the recovery again. Just before phoning I was able to go into recovery options and view the drive setup and all the files that couldn't be read are on the CD so I've no idea why the error kept occuring, and neither did the techie. Fingers crossed it works this time but I'm not overly hopefully given that we've just done exactly the same as I did before. UPDATE 1: I got into the BIOS and reset everything back to defaults and yay, my toshiba recovery wizard now starts! :-D On the down side, when trying to do a factory default software / out of the box recovery I continually get error messages with regards to copying the files, for example
cannot read from source file or disk
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Type application extension
size 585kb
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other read / copy errors include PREINST6.SWM, BOOT_32, BOOTPRIORITY, CHECKMAXPTSIZE, CHGBOOT, CPU, CPUCHECK, CREATEPARTITION, CTRLDRVINFO, DISKWIPE, DMI, DPINST32, EBLIB.DLL, ERRORDIALOG, EW3BOOTSEQ, FWLINK, FWLINK.SYS, GETHDDINFO, GETKEYSTATE, IMAGEX, INFILED, INITRECAREA, KRAIADAPI.DLL ..... at which point I decided to 'skip all' :-/
Any explanations as to what's going on and how I might be able to fix it would be very much appreciated! :-) Thank you!
I have a two and half year old satellite L500 with an Intel i-3 and 4 gigs of RAM, on which I was running Windows 7.
Admittedly it’s had rather a hard life (I ran some very demanding CAD / graphics software on it) but it had always performed well until just recently, when after suffering several BSOD (which had never happened before), the hard drive failed.
I partitioned and formatted a brand new hard drive (which is perfectly fine and functions normally when hooked up to another laptop with a SATA to USB cable) and obtained system recovery discs from Toshiba. Unfortunately, when I try and run the first disc, windows starts to load files but then generates an error screen with the message Error F3-F100-0003 and a request to turn the computer off.
When I use the windows Memory Diagnostic to get into the Windows Boot Manager Screen I get the following;
Windows failed to start. A recent hardware / software change might be the case.
To fix the problem
Insert your windows installation disc and restart your computer
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Click ‘repair your computer’
File: \boot\memtest.exe
Status: 0xc000000f
Info: the selected entry could not be loaded because the application is missing or corrupt.
I can also use F8 on startup to get into the advanced boot options but selecting any of them simply results in the F3-F100-0003 error message. I’ve run a memory test using the UBCD, which tells me the memory is fine, and tried another hard drive (which also works perfectly well in another laptop) but no joy. On phoning Toshiba support the techie said my hard drive had failed, but as I say, both hard drives are perfectly fine / usable when hooked up to another laptop. I’m now completely stuck as to what the problem is and how I might resolve it – any advice / suggestions would be most gratefully received! Thank you in advance :-)Satellite L655-S5096
Downloads here.
the second disc gives me the the "cannot read from source file or disk PREINST8.SWM"
My best guess is that the disc is not readable. Try copying it to another. Sometimes that works.
Otherwise, order new discs from Toshiba.
-Jerry
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