Help reading binary file

Similar Questions

• Strange behavior when reading binary file

  I'm reading from the binary data as flattened. The file was saved as a class of labview which contained the table of waveforms and other data. When I read the file with read binary file vi with class attached to the type of data the data are correct. But when I read the as flattened data something strange happened (see attached image). The two best shows correct data and two charts below shows the partially correct data. When you write code to read the flattened data I followed the instructions on http://zone.ni.com/reference/en-XX/help/371361H-01/lvconcepts/how_labview_stores_data_in_memory/ and http://zone.ni.com/reference/en-XX/help/371361H-01/lvconcepts/flattened_data/.

  The strange is that there is gap around 1.4 s (marked in red), but the samples before and after game.

  I don't know what I'm doing wrong.

  I have LV2011.

  Demand is also attached.

  

  

  Assuming that you your decoding of binary data is correct (that is, you have the data structure of the serialized class figured out) the problem is probably that you don't the read as binary data, you read in the text using the text file... Modify the read fucntion than binary.

• You want to read binary files in some parts of the 500th row in the 5 000th row.

  I have files of 200 MB of 1000561 lines binary data and 32 columns when I read the file and sequentially conspire full memory of the generated message.

  Now, I want to read the file in pieces as the 500th row 5,000th row with all the columns and it draw in the graph.

  I tried to develop logic using functions file advanced set file position and the binary file reading block, but still not get the sollution.

  Please, help me to solve this problem.

  Thanks in advance...

  Hi ospl,.

  To read a specific part of the binary, I suggest to set the file position where you want to read the data and specify how many blocks you must read binary file for reading binary file.VI

  for example, if you write table 2D binary file, and then mention you data type this 2D chart and make your account (5000-500). Then together, you produce position. If you have 32 DBL data type and column then it is 256 to the second row and 256 * 500 for line 501th. Use this number as input into your position.vi file get.

  I hope you find you way through this.

• "Read binary file" in hex format?

  Is there a way I can set the data type of the function "Binary file reading" so he came out in Hex format?

  Front panel.  Right-click.   Display format.

• Work of doesn´t of reading binary file on MCB2400 in LV2009 ARM embedded

  Hello

  I try to read a binary file from SD card on my MCB2400 with LV2009 Board built for the ARMS.

  But the result is always 0, if I use my VI on the MCB2400. If use the same VI on the PC, it works very well with the binary file.

  The
  access to the SD card on the works of MCB2400 in the other end, if I
  try to read a text file - it works without any problem.

  Y thre constraints for "reading a binary file" - node in Embedded in comparison to the same node on PC?

  I noticed that there is also a problem
  with the reading of the textfiles. If the sice of the file is approximately 100 bytes
  It doesn´t works, too. I understand can´t, because I read
  always one byte. And even if the implementation in Labview is so
  bad that it reads the total allways of the file in ram it sould work. The
  MCB2400 has 32 MB of RAM, so 100 bytes or even a few megabytes should
  work.

  But this doesn´t seems to be the problem for binary-problem. Because even a work of 50 bytes binary file doesn´t.

  Bye & thanks

  Amin

  I know that you have already solved this problem with a workaround, but I did some digging around in the source code to find the source of the problem and found the following:

  Currently, binary read/write primitives do not support the entry of "byte order".  Thus, you should always let this entry by default (or 0), which will use the native boutien of the target (or little endian for the target ARM).  If wire you one value other than the default, the primitive will be returns an error and does not perform a read/write.

  So, theoretically... If you return to the VI very original as your shift and delete the entry "byte order" on the binary file read, he must run a binary read little endian.

  This also brings up another point:

  If a primitive type is not what you expect, check the error output.

• "Read binary file" and efficiency

  For the first time I tried using important binary file on data files reading, and I see some real performance issues. To avoid any loss of data, I write the data as I received it acquisition of data 10 times per second. What I write is an array double 2D, 1000 x 2-4 channels data points. When reading in the file, I wish I could read it as a 3D array, all at the same time. This does not seem supported, so many times I do readings of 2D table and use a shift with table register building to assemble the table 3D that I really need. But it is incredibly slow! It seems that I can read only a few hundred of these 2D members per second.

  It has also occurred to me that the array of construction used in a shift register to continue to add on the table could be a quadratic time operation depending on how it is implemented. Continually and repeatedly allocating more larger and large blocks of memory and copy the table growing at every stage.

  I'm looking for suggestions on how to effectively store, read effectively and efficiently back up my data in table 3-d that I need. Maybe I could make your life easier if I had "Raw write" and "read the raw data" operations only the digits and not metadata.then I could write the file and read it back in any size of reading and writing songs I have if you please - and read it with other programs and more. But I don't see them in the menus.

  Suggestions?

  Ken

  
  

• Read binary file

  Hello, I would like to write and read a 2D in a binary table. I get an error in my VI and I have no idea how to solve this problem. Can someone help me?

  In addition, the file extension should be .bin or. dat.

  Thank you

  Zied

  You really need to add the size of the array.  Otherwise you will have no idea of what should be the size of your two dimension.  Then just do a simple reading with a 2D data type table.

  

• With kernel panic issues please help reading log files

  Whenever I plug a peripheral usb Arduino my mac crashes. Here is the log. I can't understand.

  _________________________

  Anonymous UUID: F337CFF1-4204-DF6D-2BD0-B6FDF3953966

  Mon 3 Oct 11:30:17 2016

  Panic report *.

  panic (the appellant 2 cpu 0xffffff801554186b): 'item 0xffffff9202993dee of vm area objects being released taken wrongly zone kalloc.16\n"@/Library/Caches/com.apple.xbs/Sources/xnu/xnu-3789.1.32/osfmk/kern /zalloc.c:2664 '.

  Backtrace (2 CPU), Frame: Return address

  0xffffff9202823ba0: 0xffffff80154f748c

  0xffffff9202823c20: 0xffffff801554186b

  0xffffff9202823d00: 0xffffff8015a86fe6

  0xffffff9202823d20: 0xffffff7f9643d00a

  0xffffff9202823d70: 0xffffff7f9639600a

  0xffffff9202823d90: 0xffffff7f9639bf9d

  0xffffff9202823e10: 0xffffff8015ac00ba

  0xffffff9202823e80: 0xffffff7f9639b8dd

  0xffffff9202823ed0: 0xffffff7f963a07e1

  0xffffff9202823f10: 0xffffff7f963a053f

  0xffffff9202823f30: 0xffffff8015abd621

  0xffffff9202823f80: 0xffffff8015abcc06

  0xffffff9202823fb0: 0xffffff80154a6af7

  Extensions of core in backtrace:

  com.apple.iokit.IOUSBHostFamily (1.1) [6A671CD8-5527-3A10-8675-1421D158D7A7] @ ffff7f96365000-> 0xffffff7f963ccfff 0xff

  dependency: com.apple.driver.AppleBusPowerController (1.0) [DB526B45 - 1 A 45 - 3A 81 - A0C1-57F826CAD EDF]@0xffffff7f96358000]

  com.apple.iokit.IOUSBFamily (900.4.1) [8F6207EC-608D-373A-B35E-E6578202F58D] @ ffff7f96409000-> 0xffffff7f964a1fff 0xff

  dependency: com.apple.iokit.IOPCIFamily (2.9) [731443D8-78D5-30C8-939A-1ED3E857CA22] @ 7f95d32000 0xffffff

  dependency: ffff7f96365000 @0xff com.apple.iokit.IOUSBHostFamily (1.1) [6A671CD8-5527-3A10-8675-1421D158D7A7]

  Corresponding to the current thread BSD process name: kernel_task

  Boot args: kext-dev-mode = 1

  Mac OS version:

  A 16, 323

  Kernel version:

  16.0.0 Darwin kernel version: Mon Aug 29 17:56:20 PDT 2016; root:XNU-3789.1.32~3/RELEASE_X86_64

  Kernel UUID: 622D2470-C34D-31F9-A62B-6AA9A3C6A3CD

  Slide kernel: 0 x 0000000015200000

  Text of core base: 0xffffff8015400000

  Text __HIB base: 0xffffff8015300000

  Name of system model: MacBookPro11, 5 (Mac-06F11F11946D27C5)

  Availability of the system in nanoseconds: 5562983687

  last load kext to 5127051852: com.apple.driver.ApplePlatformEnabler 2.7.0d0 (addr 0xffffff7f97b15000 size 28672)

  kexts responsible:

  com WCH.usbserial 1

  com Kaspersky.NKE 2.3.1a8

  com Kaspersky.kext.Klif 3.4.2a30

  com.apple.driver.ApplePlatformEnabler 2.7.0d0

  com.apple.driver.X86PlatformShim 1.0.0

  com.apple.driver.AppleOSXWatchdog 1

  com.apple.driver.AppleGraphicsDevicePolicy 3.13.60

  com.apple.driver.AppleHDAHardwareConfigDriver 276.26

  com.apple.driver.AppleUpstreamUserClient 3.6.4

  com.apple.driver.AppleHDA 276.26

  com.apple.kext.AMDFramebuffer 1.4.4

  com Apple.Driver.pmtelemetry 1

  com.apple.iokit.IOUserEthernet 1.0.1

  com.apple.driver.AppleIntelHD5000Graphics 10.1.8

  com.apple.iokit.IOBluetoothSerialManager 5.0.0f18

  com.apple.AMDRadeonX4000 1.4.4

  com.apple.driver.AppleCameraInterface 5.57.0

  com.apple.Dont_Steal_Mac_OS_X 7.0.0

  com.apple.driver.AppleHV 1

  com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 5.0.0f18

  com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

  com.apple.driver.AppleSMCLMU 208

  com.apple.driver.AppleLPC 3.1

  com.apple.driver.AppleMuxControl 3.13.60

  com.apple.kext.AMD7000Controller 1.4.4

  com.apple.driver.AppleThunderboltIP 3.0.8

  com.apple.driver.AppleIntelFramebufferAzul 10.1.8

  com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

  com.apple.driver.AppleFIVRDriver 4.1.0

  com.apple.driver.AppleBacklight 170.9.10

  com.apple.driver.AppleMCCSControl 1.2.13

  com.apple.iokit.SCSITaskUserClient 394

  com.apple.driver.AppleUSBStorageCoexistentDriver 404.1.1

  com.apple.driver.AppleUSBCardReader 404.1.1

  com.apple.driver.AppleTopCaseHIDEventDriver 102

  com.apple.driver.AppleUSBTopCaseDriver 102

  com.apple.iokit.IOBluetoothUSBDFU 5.0.0f18

  com.apple.driver.CoreStorageFsck 540

  com.apple.iokit.IOAHCIBlockStorage 295.1.1

  com.apple.driver.AirPort.Brcm4360 1100.37.1a16

  com.apple.driver.AppleAHCIPort 326

  com.apple.driver.AppleFileSystemDriver 3.0.1

  com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

  com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

  com.apple.BootCache 39

  com Apple.filesystems.HFS.kext 366.1.1

  com.apple.driver.AppleSmartBatteryManager 161.0.0

  com.apple.driver.AppleACPIButtons 5.0

  com.apple.driver.AppleRTC 2.0

  com.apple.driver.AppleHPET 1.8

  com.apple.driver.AppleSMBIOS 2.1

  com.apple.driver.AppleACPIEC 5.0

  com.apple.driver.AppleAPIC 1.7

  com Apple.NKE.applicationfirewall 171

  com Apple.Security.Quarantine 3

  com.apple.security.TMSafetyNet 8

  com.apple.driver.DspFuncLib 276.26

  com.apple.kext.OSvKernDSPLib 525

  com.apple.iokit.IOSerialFamily 11

  com.apple.iokit.IOSurface 152

  com.apple.iokit.IOBluetoothHostControllerUSBTransport 5.0.0f18

  com.apple.iokit.IOBluetoothHostControllerTransport 5.0.0f18

  com.apple.iokit.IOBluetoothFamily 5.0.0f18

  com.apple.driver.AppleHDAController 276.26

  com.apple.iokit.IOHDAFamily 276.26

  com.apple.iokit.IOAudioFamily 205.11

  com.apple.vecLib.kext 1.2.0

  com.apple.driver.IOPlatformPluginLegacy 1.0.0

  com.apple.driver.X86PlatformPlugin 1.0.0

  com.apple.driver.AppleSMBusPCI 1.0.14d1

  com.apple.driver.IOPlatformPluginFamily 6.0.0d8

  com.apple.driver.AppleGraphicsControl 3.13.60

  com.apple.kext.AMDSupport 1.4.4

  com.apple.driver.AppleThunderboltEDMSink 4.1.1

  com.apple.driver.AppleThunderboltDPOutAdapter 4.5.3

  com.apple.AppleGraphicsDeviceControl 3.13.60

  com.apple.iokit.IOAcceleratorFamily2 288.13

  com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

  com.apple.driver.AppleBacklightExpert 1.1.0

  com.apple.iokit.IONDRVSupport 2.4.1

  com.apple.driver.AppleSMC 3.1.9

  com.apple.driver.AppleSMBusController 1.0.14d1

  com.apple.iokit.IOGraphicsFamily 2.4.1

  com.apple.iokit.IOUSBMassStorageClass 4.0.4

  com.apple.iokit.IOSCSIBlockCommandsDevice 394

  com.apple.iokit.IOUSBMassStorageDriver 131.1.1

  com.apple.iokit.IOSCSIArchitectureModelFamily 394

  com.apple.driver.AppleHIDKeyboard 197

  com.apple.driver.AppleMultitouchDriver 367,6

  com.apple.driver.AppleInputDeviceSupport 76.1

  com.apple.driver.usb.IOUSBHostHIDDevice 1.1

  com Apple.Driver.USB.cdc 5.0.0

  com.Apple.Driver.USB.Networking 5.0.0

  com.apple.driver.usb.AppleUSBHostCompositeDevice 1.1

  com.apple.driver.CoreStorage 540

  com.apple.driver.AppleXsanScheme 3

  com.apple.iokit.IO80211Family 1200.12.2

  com.apple.driver.mDNSOffloadUserClient 1.0.1b8

  com Apple.Driver.corecapture 1.0.4

  com.apple.driver.AppleUSBMergeNub 900.4.1

  com.apple.driver.usb.AppleUSBXHCIPCI 1.1

  com.apple.driver.usb.AppleUSBXHCI 1.1

  com.apple.iokit.IOAHCIFamily 288

  com Apple.filesystems.HFS.Encodings.kext 1

  com.apple.iokit.IONetworkingFamily 3.2

  com.apple.driver.AppleThunderboltDPInAdapter 4.5.3

  com.apple.driver.AppleThunderboltDPAdapterFamily 4.5.3

  com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.3

  com.apple.driver.AppleThunderboltNHI 4.1.3

  com.apple.iokit.IOThunderboltFamily 6.2.1

  com.apple.driver.usb.AppleUSBHostPacketFilter 1.0

  com.apple.iokit.IOUSBFamily 900.4.1

  com.apple.iokit.IOUSBHostFamily 1.1

  com.apple.driver.AppleUSBHostMergeProperties 1.1

  com.apple.driver.AppleBusPowerController 1.0

  com.apple.driver.AppleEFINVRAM 2.1

  com.apple.driver.AppleEFIRuntime 2.0

  com.apple.iokit.IOHIDFamily 2.0.0

  com.apple.iokit.IOSMBusFamily 1.1

  com Apple.Security.sandbox 300.0

  com.apple.kext.AppleMatch 1.0.0d1

  com.apple.driver.AppleKeyStore 2

  com.apple.driver.AppleMobileFileIntegrity 1.0.5

  com.apple.driver.AppleCredentialManager 1.0

  com.apple.driver.DiskImages 444

  com.apple.iokit.IOStorageFamily 2.1

  com.apple.iokit.IOReportFamily 31

  com.apple.driver.AppleFDEKeyStore 28.30

  com.apple.driver.AppleACPIPlatform 5.0

  com.apple.iokit.IOPCIFamily 2.9

  com.apple.iokit.IOACPIFamily 1.4

  com.apple.kec.Libm 1

  com Apple.KEC.pthread 1

  com Apple.KEC.corecrypto 1.0

  System profile:

  Airport: spairport_wireless_card_type_airport_extreme (0x14E4, 0 x 152), Broadcom BCM43xx 1.0 (7.21.171.10.1a16)

  Bluetooth: Version 5.0.0f18, 3 services, 17 machines, 1 incoming serial ports

  Bus crush: MacBook Pro, Apple Inc., 27.1

  Memory module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533642465238412D50422020

  Memory module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533642465238412D50422020

  USB device: USB 3.0 Bus

  USB Device: Card reader

  USB device: Apple keyboard / Trackpad

  USB Device: USB Bluetooth host controller

  Serial ATA Device: APPLE SM0512G, GB 500,28 SSD

  Model: MacBookPro11, 5, MBP114.0172.B09 of BootROM, 4 processors, Intel Core i7, 2.5 GHz, 16 GB, MSC 2.30f2

  Network service: Wi - Fi, AirPort, en0

  Graphics card: AMD Radeon M370X, AMD Radeon M370X, PCIe, 2048 MB R9 R9

  Graphics card: Intel integrated Iris Pro, Intel Iris Pro,

  Uninstall Kapersky. His tendency to interfere with the operation of the computer while offering little or no benefit.

  Uninstall Kapersky

• Read and analyze a binary file

  I can't properly analyze a binary file. I use the Labview 'Reading binary file' example, I joined to open the file. I suspect that I use incorrect settings on the command "binary file reading.

  Here is a little history on my request. The binary file, that I'm reading has given stored as 16-bit and 32-bit unsigned integers. The data comes in blocks of bytes, 18; in this piece of 18 bytes are the five values 16-bit and two 32-bit values. At the end of the day, I fear that with pulling on one of the 16-bit of each data segment values, so the amount of the fine if the sorting method interprets the 32 bit values as two consecutive 16-bit values.

  Any suggestions on how to properly analyze the binary file? Thanks for your suggestions!

  P.S. I have attached an example of binary file I am trying to analyze. She doesn't have an extension so I chagned it in .txt for download. It has 40 k + events, and a piece of 18-byte data is saved for each "event", so the binary is long enough.

  You can read the file until all the bytes and do some gymnastics Unflatten or specify the data type for the binary file reading.  No need to feed the size, just let it read all of the file at a time.  Nice how the extracted from cultures of the constant of cluster.

  

• write 1 d digital table in a binary file and start a new line or insert a separator for each loop writing file

  Hello:

  I'm fighting with digital table of 1 d writeing in a binary file and start a new line or insert a separator for each loop writing file. So for each loop, it runs, LABVIEW code will collect a table 1 d with 253 pieces of a spectrometer. When I write these tables in the binay file and the following stack just after the previous table (I used MATLAB read binary file). However whenever if there is missing data point, the entire table is shifted. So I would save that table 1-d to N - D array and N is how many times the loop executes.

  I'm not very familiar with how write binary IO files works? Can anyone help figure this? I tried to use the file position, but this feature is only for writing string to Bodet. But I really want to write 1 d digital table in N - D array. How can I do that.

  Thanks in advance

  lawsberry_pi wrote:

  So, how can I not do the addition of a length at the beginning of each entry? Is it possible to do?

  On top of the binary file write is a Boolean entry called ' Prepend/chain on size table (T) '.  It is default to TRUE.  Set it to false.

  Also, be aware that Matlab like Little Endian in LabVIEW by default Big Endian.  If you probably set your "endianness" on writing binary file as well.

• define a data type (read binary)

  Hello

  I want to read a file GET TRC and fight with its data type, I know that I can put a cluster in the entry of the data on a "read the binary" type, but I don't know how it actually works, it's what I have:

  I have a definition of the TRC header file:

  offset: 0, label: patient info, data type: char, description: patient information

  offset: 32, label: recording information, data type: char, description: recording information

  offset: 64, label: acquisition unit, data type: Unsigned long, description: device type

  etc...

  Above is an example (a fake), because I can not give the description of file structure, this specific file...

  So my question is: how would you define a data type cluster that could read binary files and lectures we love exactly this way?

  Or it only works with files saved as a structure for labview? For example, a cluster?

  Best regards

  Thijs Boeree

  ThijsBoeree wrote:
  Hi, I'm on my way back now, so I'll check the first thing in the morning. I thought about it and he came to the conclusion that I might need to do a painting of a cluster with an offset, length (County) and different types of data and run in a loop of fror to load the binary file for reading and the position of the file 'set' to recover data and afterwards put them in a well-defined place cluster!
  But maybe you have the same solution...

  You can do this, but of course you can't auto-index different types of data in a table. But you could fill the cluster directly in the loop for.

  

• Adds data to the binary file as concatenated array

  Hello

  I have a problem that can has been discussed several times, but I don't have a clear answer.

  Normally I have devices that produce 2D image tables. I have send them to collection of loop with a queue and then index in the form of a 3D Board and in the end save the binary file.

  It works very well. But I'm starting to struggle with problems of memory, when the number of these images exceeds more than that. 2000.

  So I try to enjoy the fast SSD drive and record images in bulk (eg. 300) in binary file.

  In the diagram attached, where I am simulating the camera with some files before reading. The program works well, but when I try to open the new file in the secondary schema, I see only the first 300 images (in this case).

  I read on the forum, I have to adjust the number of like -1 in reading binary file and then I can read data from the cluster of tables. It is not very good for me, because I need to work with the data with Matlab and I would like to have the same format as before (for example table 3D - 320 x 240 x 4000). Is it possible to add 3D table to the existing as concatenated file?

  I hope it makes sense :-)

  Thank you

  Honza

  • Good to simulate the creation of the Image using a table of random numbers 2D!  Always good to model the real problem (e/s files) without "complicating details" (manipulation of the camera).
  • Good use of the producer/consumer in LT_Save.  Do you know the sentinels?  You only need a single queue, the queue of data, sending to a table of data for the consumer.  When the producer quits (because the stop button is pushed), it places an empty array (you can just right click on the entry for the item and choose "Create Constant").  In the consumer, when you dequeue, test to see if you have an empty array.  If you do, stop the loop of consumption and the output queue (since you know that the producer has already stopped and you have stopped, too).
  • I'm not sure what you're trying to do in the File_Read_3D routine, but I'll tell you 'it's fake  So, let's analyze the situation.  Somehow, your two routines form a producer/consumer 'pair' - LT_Save 'product' a file of tables 3D (for most of 300 pages, unless it's the grand finale of data) and file_read_3D "consume" them and "do something", still somewhat ill-defined.  Yes you pourrait (and perhaps should) merge these two routines in a unique "Simulator".  Here's what I mean:

  

  This is taken directly from your code.  I replaced the button 'stop' queue with code of Sentinel (which I won't), and added a ' tail ', Sim file, to simulate writing these data in a file (it also use a sentinel).

  Your existing code of producer puts unique 2D arrays in the queue of data.  This routine their fate and "builds" up to 300 of them at a time before 'doing something with them', in your code, writing to a file, here, this simulation by writing to a queue of 3D Sim file.  Let's look at the first 'easy' case, where we get all of the 300 items.  The loop For ends, turning a 3D Board composed of 300 paintings 2D, we simply enqueue in our Sim file, our simulated.  You may notice that there is an empty array? function (which, in this case, is never true, always False) whose value is reversed (to be always true) and connected to a conditional indexation Tunnel Terminal.  The reason for this strange logic will become clear in the next paragraph.

  Now consider what happens when you press the button stop then your left (not shown) producer.  As we use sentries, he places an empty 2D array.  Well, we dequeue it and detect it with the 'Empty table?' feature, which allows us to do three things: stop at the beginning of the loop, stop adding the empty table at the exit Tunnel of indexing using the conditional Terminal (empty array = True, Negate changes to False, then the empty table is not added to the range) , and it also cause all loop to exit.  What happens when get out us the whole loop?  Well, we're done with the queue of data, to set free us.  We know also that we queued last 'good' data in the queue of the Sim queue, so create us a Sentinel (empty 3D table) and queue for the file to-be-developed Sim consumer loop.

  Now, here is where you come from it.  Write this final consumer loop.  Should be pretty simple - you Dequeue, and if you don't have a table empty 3D, you do the following:

  • Your table consists of Images 2D N (up to 300).  In a single loop, extract you each image and do what you want to do with it (view, save to file, etc.).  Note that if you write a sub - VI, called "process an Image" which takes a 2D array and done something with it, you will be "declutter" your code by "in order to hide the details.
  • If you don't have you had an empty array, you simply exit the while loop and release the queue of the Sim file.

  OK, now translate this file.  You're offshore for a good start by writing your file with the size of the table headers, which means that if you read a file into a 3D chart, you will have a 3D Board (as you did in the consumer of the Sim file) and can perform the same treatment as above.  All you have to worry is the Sentinel - how do you know when you have reached the end of the file?  I'm sure you can understand this, if you do not already know...

  Bob Schor

  PS - you should know that the code snippet I posted is not 'properly' born both everything.  I pasted in fact about 6 versions here, as I continued to find errors that I wrote the description of yourself (like forgetting the function 'No' in the conditional terminal).  This illustrates the virtue of written Documentation-"slow you down", did you examine your code, and say you "Oops, I forgot to...» »

• read in a labview complex binary file written in matlab and vice versa

  Dear all. We use the attached funtion "write_complex_binary.m" in matlab to write complex numbers in a binary file. The format used is the IEEE floating point with big-endian byte order. And use the "read_complex_binary.m" function attached to read the complex numbers from the saved binary file. However, I just don't seem to be able to read the binary file generated in labview. I tried to use the "Binary file reading" block with big-endian ordering without success. I'm sure that its my lack of knowledge of the reason why labview block works. I also can't seem to find useful resources to this issue. I was hoping that someone could kindly help with this or give me some ideas to work with.

  Thank you in advance of the charges. Please find attached two zipped matlab functions. Kind regards.

  Be a scientist - experiment.

  I guess you know Matlab and can generate a little complex data and use the Matlab function to write to a file.  You can also function Matlab that you posted - you will see that Matlab takes the array of complex apart in 2D (real, imaginary) and which are written as 32 bits, including LabVIEW floats called "Sgl".

  So now you know that you must read a table of Sgls and find a way to put together it again in a picture.

  When I made this experience, I was the real part of complex data (Matlab) [1, 2, 3, 4] and [5, 6, 7, 8] imagination.  If you're curious, you can write these out in Matlab by your complex function data write, then read them as a simple table of Dbl, to see how they are classified (there are two possibilities-[1, 2, 3, 4, 5, 6, 7, 8], is written "all real numbers, all imaginary or [1, 5, 2, 6, 3, 7, 4) [, 8], if 'real imaginary pairs'].

  Now you know (from the Matlab function) that the data is a set of Sgl (in LabVIEW).  I assume you know how to write the three functions of routine that will open the file, read the entire file in a table of Sgl and close the file.  Make this experience and see if you see a large number.  The "problem" is the order of bytes of data - Matlab uses the same byte order as LabVIEW?  [Advice - if you see numbers from 1 to 8 in one of the above commands, you byte order correct and if not, try a different byte order for LabVIEW binary reading function].

  OK, now you have your table of 8 numbers Sgl and want to convert it to a table of 4 complex [1 +, 2 + 6i, 5i 3 +, 4 + i8 7i].  Once you understand how to do this, your problem is solved.

  To help you when you are going to use this code, write it down as a Subvi whose power is the path to the file you want to read and that the output is the CSG in the file table.  My routine of LabVIEW had 8 functions LabVIEW - three for file IO and 5 to convert the table of D 1 Sgl a table of D 1 of CSG.  No loops were needed.  Make a test - you can test against the Matlab data file you used for your experience (see above) and if you get the answer, you wrote the right code.

  Bob Schor

• Error 116 when a string of binary file reading

  I try to use the 'writing on a binary' and "binary file reading" pair of VI to write a string to a binary file and read it again.  The file is created successfully and a hex editor confirms that the file contains what is expected (a header + chain).  However, when I try to read the string back once again, I received an error 116: "LabVIEW: Unflatten or stream of bytes read operation failed due to corrupted, unexpected or truncated data.»  A quirk I found though, is that if I put "endianness" to "Big-Endian, network order", the error disappears when I use "native, welcome the order" (my original setting) or "little-endian" error occurs.  Did I miss something in the documentation indicating that you can use big endian order when writing of strings, I do something wrong, or is this a bug in Labview?  Because the program that it will be used for is to write large networks, in addition to channels, I would like to be able to stick to the 'native' setting for speed purposes and must not mix "endianness".

  I have attached a VI of example that illustrates this problem.

  I'm using Labview 8.5 on Windows XP SP2.

  Thank you

  Kevin

  Hello

  Please contact National Instruments!  I checked the behavior that you have met and agree that it is a bug, it has been reported to R & D (CAR # 130314) for further investigation.  As you have already understood possible workaround is to use the Big-Endian parameter.  Also, I am enclosing another example that converts the string to a binary array before writing to the file, and then converts to a string according to the playback of the file.  Please let me know if you have any questions after looking at this example though and I'll be happy to help you!  Thank you very much for the comments!

• Read large binary files in addition to 1,000 records

  I have a few large binary data files created in Labview which cannot be entirely read in Labview. Normally acquire us data in Labview and analyze in Matlab. But now we need to read them in Labview. The files have a header that tells us very well. Then there is data of 64 channels. There is a piece of data of each channel for each stamp of time for 300 000 locations. The table of data read in is therefore 64 lines by 300 000 columns.

  MATLAB reads these files in their entirety. But Labview will show only the first 1000 columns. After reading the data file my table is only 64 lines per 1000 columns. It seems that is the default maximum table size or the maximum number of records for Binary File.vi reading is somehow limited. I searched and didn't find an answer.

  

  My vi is attached. The data file is too large to post on the forum. If someone can tell me how to post large files, I'll put it up.

  Any help would be greatly appreciated!

  I can't download your data file.  It is blocked by my antivirus because it is suspicious of your file hosting websites.

  You have your program that creates the data file?  See how writing can say more how the data file is packaged.

  Try to set the data type for the last reading a constant I16 rather than an array of 2D I16.  When you read a 2D picture, he expects that size data in row and column to be part of the information, in that it is reading.  If this information is not there, then it will be you end up with an error message you get.

  If the data have been written just as a series of values I16, then row and column sizes will not here.  Then read in as a type of data I16 and you will get a 1 d table as long as necessary.  Then, you would need to remodel in a table 2D of the appropriate dimensions.