Converting string from file to array
I'm new to LabVIEW and have been thrown into the middle of a project, so I need to get some code working fast! Can someone help me understand why the VI I've attached isn't working? I want to have a text file that contains a list of integers that will be used to reference particular elements in arrays within my program. I tried to follow an example I found, but the output that should be an array is coming out as a scaler. Any help would be super appreciated! Thanks!
Solved!
Go to Solution.
Attachments:
string_to_array.vi 9 KB
exp.txt 1 KB
First, let's explain the reason for your error: The reason why it's happening is that you're trying to do two different things at the same time. You're auto-indexing the array and you're trying to index the array inside the loop. When you wire an array to a for loop it auto-indexes the loop. Meaning LabVIEW knows how many times to run the loop - there is no need to wire to the N terminal. Also, the wire inside the loop will be an instance of the element of the array, not the array. So, the wire inside the loop is a scalar. Thus, the reason for the broken wire - you can't index a scalar.
Also, I'm not sure what you're trying to do with the indexing of the one element of the cluster. The cluster is empty, so there's nothing to index. Presumably the file is there to tell you which elements to pull out from the "Amp2" array from the cluster. If so, remember that auto-indexing works both ways. If you connect an "outbound" wire to the edge of a loop it auto-indexed there as well, meaning the output will be an array.
Please read the LabVIEW Help on auto-indexing.
Now, given all of that, here is what your code should look like:
Note the use of the Read From Spreadsheet File VI. It makes your life easier.
Attachments:
fixed code.png 22 KB
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Spoiler (Highlight to read)
Ever tried SpreadsheetStringToArray?
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Levi -
How do I read directly from file into byte array
I am reading an image from a file into a BuffertedImage then writing it out again into an array of bytes which I store and use later on in the program. Currently Im doing this in two stages is there a way to do it it one go to speed things up.
try
//Read File Contents into a Buffered Image
/** BUG 4705399: There was a problem with some jpegs taking ages to load turns out to be
* (at least partially) a problem with non-standard colour models, which is why we set the
* destination colour model. The side effect should be standard colour model in subsequent reading.
BufferedImage bi = null;
ImageReader ir = null;
ImageInputStream stream = ImageIO.createImageInputStream(new File(path));
final Iterator i = ImageIO.getImageReaders(stream);
if (i.hasNext())
ir = (ImageReader) i.next();
ir.setInput(stream);
ImageReadParam param = ir.getDefaultReadParam();
ImageTypeSpecifier typeToUse = null;
for (Iterator i2 = ir.getImageTypes(0); i2.hasNext();)
ImageTypeSpecifier type = (ImageTypeSpecifier) i2.next();
if (type.getColorModel().getColorSpace().isCS_sRGB())
typeToUse = type;
if (typeToUse != null)
param.setDestinationType(typeToUse);
bi = ir.read(0, param);
//ir.dispose(); seem to reference this in write
//stream.close();
//Write Buffered Image to Byte ArrayOutput Stream
if (bi != null)
//Convert to byte array
final ByteArrayOutputStream output = new ByteArrayOutputStream();
//Try and find corresponding writer for reader but if not possible
//we use JPG (which is always installed) instead.
final ImageWriter iw = ImageIO.getImageWriter(ir);
if (iw != null)
if (ImageIO.write(bi, ir.getFormatName(), new DataOutputStream(output)) == false)
MainWindow.logger.warning("Unable to Write Image");
else
if (ImageIO.write(bi, "JPG", new DataOutputStream(output)) == false)
MainWindow.logger.warning("Warning Unable to Write Image as JPEG");
//Add to image list
final byte[] imageData = output.toByteArray();
Images.addImage(imageData);
If you don't need to manipulate the image in any way I would suggest you just read the image file directly into a byte array (without ImageReader) and then create the BufferedImage from that byte array.
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