Create and read byte data

How to create a byte data, I dont know how to call it, i will clear it below,
Header | Message |
Username | 01101001 |
How to create like this, sorry if my question is not clear, i will clarify the doubt if you have.

>
Actually i am working in a sensor project, the sensor reads the heart beat and body temperature and then it sends through Bluetooth, so first i have to read it and later i have to convert it into string. Hope it clears now.
>
No - it isn't clear now.
You need to explain how the sensor hardware is providing the data. Is it as a stream of bytes? What is the interface between the pc and the sensor? How does the Java app know that there is sensor data available? How does it query the sensor to determine the status.
If the sensor provides a pulse value of '60' how does the sensor encode that value? Does it use binary? BCD? floating point?
A binary value of '60' would be hexadecimal 0x3c and in binary would be 00111100. Why would you want to display 00111100? No one would understand what that value means. Shouldn't you display '60'?
Provide sample sensor data, the format the sensor uses and what you are really trying to do with the data.

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How to create and read text file using LabVIEW 7.1 PDA module?

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I attach my code here.
Attachments:
File_IO.vi ‏82 KB

Well my acquisition code runs perfect. The problem is reading it. I can't seem to read my data no matter what I do. My data gets saved as a string using the array to string vi but I've read that the string to array vi (which I need to convert back to array to read my data) does not work on the pda. I'm using version 8.0. So I was trying to modify the program posted in this discussion so that it would save data from my DAQ. I did that but I still can't read the data after its saved. I really don't know what else to do. All I need to do is read the data on the pda itself. I can't understand why I'm having such a hard time doing that. I found a possible solution on another discussion that talks about parsing the strings because of the bug in the "string to array" vi. However, that lead me to another problem because for some reason, the array indicators or graphs don't function on the pda. When i build the program to the pda or emulator, the array indicators are faded out on the front panel as if the function is not valid. Does this kind of help give a better picture of what I'm trying to do. Simply read data back. Thanks.

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Attachments:
Krishna_Files.zip ‏552 KB

The binary data file has no time axis information, it is pure y data. Only the LVM file contains information about t(0) and dt. Since you throw away this information before saving to the binary file, it cannot be retrieved.
Did you try wiring a 2 as suggested?
(see also http://forums.ni.com/ni/board/message?board.id=BreakPoint&message.id=925 )
Message Edited by altenbach on 07-29-2005 11:35 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Retrive_BINARY_DataMOD2.vi ‏1982 KB

Changing Created and/or Modified dates???

Just taking a guess this is the right forum for this.
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Thank you

I have a similar problem to the one posted in this forum and this solution was helpful. However it does not work for filenames with sapaces, and it is very time consuming since I need to change the date of about 1,500 picture files. Is there a way to:
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How to check audit setting and read audit data?

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select * from sysaudits_02 order by eventtime desc
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event
eventmod
spid
eventtime
sequence
suid
dbid
objid
xactid
loginname
dbname
objname
objowner
extrainfo
16
45
1
130
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5
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[NULL]
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45
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[NULL]
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[NULL]
[NULL]
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45
1
82
05/15/2014 1:49:03.243 PM
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38
5
[NULL]
[NULL]
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mydb
[NULL]
[NULL]
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45
1
141
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38
5
[NULL]
[NULL]
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mydb
[NULL]
[NULL]
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45
1
80
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5
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[NULL]
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sp_audit "disk", "all", "all", "on"
then how to know how many auditing event is on in the future(maybe set by someone else)?

Hi Kent,
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1>
2> select audit_event_name(45)
3> go
Login
(1 row affected)

Editable and Read-Only Date Picker have different display formats -- Bug?

Hi all,
This is a follow on to a previous posting about getting a Date Picker field to display read-only (Date Picker and Read-Only Condition works on LAST state of element
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Anyone else notice this, or have I just missed something obvious?
Thanks,
Petie

I'm not sure why this happens but to work around it I added this before header process code to the page:
execute immediate 'alter session set nls_date_format = ''DD-MON-YYYY''';
Scott

How to Create and export motion data from After effects CC to Flash CC

Hi there ,
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Can anybody help me out with this?

Yeah, that's one of the reasons that we removed it: no one was using it. And it was terrible.
Here's more information:
http://forums.adobe.com/message/5555577
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Module function to create and read pricing condition

Hello,
I am looking for an easy function module that enable us to get the pricing condition record ?
(As transaction for example VK13)
And I am looking for a function module to create pricing condition ?
(As transaction XK15 or at least VK11)
Thanks in advance,
Maxime

for creating try BAPI_FTR_CONDITION_CREATE (no experience with this one..)
for reading use Function SD_COND_ACCESS
consider more than one Condition Table may be involved via AccSeq for your KSCHL.
Fill KOMK and KOMP accordingly for all Tables of AccSeq for the KSCHL
Cheers
carsten
example:
*& Report ZCAWA_CONDR
TESTREPORT
Konditionen lesen via Zugriffsfolge des eingegebenen KSCHL
C.Wagener, 11.02.2009
REPORT zcawa_condr.
PARAMETERS:
p_kappl TYPE kappl DEFAULT 'V',
p_kschl TYPE kschl DEFAULT 'ZGRA',
p_vkorg type vkorg default '0100',
p_vtweg type vtweg default '00',
p_datum TYPE sydatum default sy-datum,
p_mlfb type YYBCEZNDR default '6MD90001AA'.
DATA: ls_komk TYPE komk.
DATA: ls_komp TYPE komp.
DATA: ls_konp TYPE konp.
DATA: lt_t682i TYPE TABLE OF t682i WITH HEADER LINE .
DATA: ls_koprt TYPE koprt.
DATA: lt_conditions TYPE TABLE OF a000 WITH HEADER LINE.
DATA: ls_sdprothead TYPE sdprothead.
ls_komk-prsdt       = p_datum.
ls_komk-vkorg       = p_vkorg.
ls_komk-vtweg       = p_vtweg.
ls_komp-zzyybcezndr = p_mlfb.
Tabellen der Zugriffsolge zur Konditionsart ermitteln
SELECT * FROM t682i AS a
JOIN t685 AS b ON
akvewe EQ bkvewe AND
akappl EQ bkappl AND
akozgf EQ bkozgf
INTO CORRESPONDING FIELDS OF TABLE lt_t682i
WHERE b~kvewe EQ 'A'
AND b~kappl EQ p_kappl
AND b~kschl EQ p_kschl.
pro ZugFolgen-Tab-Eintrag FuBa aufrufen
LOOP AT lt_t682i.
CALL FUNCTION 'SD_COND_ACCESS'
    EXPORTING
      application          = p_kappl
      condition_type       = p_kschl
      date                 = p_datum
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      position_comm_area   = ls_komp
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      t681v_missing        = 6
      t681z_missing        = 7
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und raus, wenn Treffer
READ TABLE lt_conditions INDEX 1.
IF sy-subrc EQ 0.
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ENDLOOP.

Order Reporting by Create and/or change date

Hi all,
is it possible using business content to report orders based on the date that they were created -OR- changed/canceled (if they were). My understanding is that BC reports orders by original CREATE date only.
Any links or documents_?

any documents on best practices for this for order reporting and open order reporting...i want to make sure that the deltas reflect the "truth" as the business sees it here
Calday     Created on Date      Changed on Date      Planned Ship Date     Qty      Sales Rep     Doc Type     Change Flag
1/1/2007     1/1/2007     #     1/9/2007     10      Bob     O     #
1/4/2007     1/1/2007     #     1/9/2007     (10)     Bob     O     #
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1/6/2007     1/1/2007     1/4/2007     1/9/2007     (10)     Joe     O     C
1/6/2007     1/1/2007     1/6/2007     1/9/2007     7      Joe     O     C
1/9/2007     1/1/2007     1/6/2007     1/9/2007     (7)     Joe     O     C
1/9/2007     1/1/2007     1/7/2007     1/11/2007     7      Joe     O     C

Opening and reading a dat file

I have a .dat file on disk that I want to read. Is there a way I can open the file without giving the whole path starting c:/dsfsd/dfs/df/sdfsdf/....

feel slightly wierd asking this since i feel i shud
be knowing but whats "relative path" ???a relative path is the path from where the program is running. For example, let's say you are running in c:\java\bin and your prorgram is in there, and your file is there as well, then the relative path would just be \ thats it.
A better way to understand this is when dealing with HTML Lets say you want to make a link to a picture. Your page is located here : /site/dir1/dir2/index.html and your pictures are stored in /site/pictures/ a way to that without naming the whole site is with relative path. Therefore if you ever wanted to move your site around to another server you wouldn't need to change anything. So for this example, the relative path to, let's say pic.jpg would be ../../pictures/pic.jpg I dont know if this clears anything up. But basically the ../ is telling the computer to go up a folder everytime.
Good luck

Does anybody know any software for creating and reading PDF-417 to be integrated in my vi?

Hi, I want to generate PDF-417 from mi vi. After that I want to scan a PDF-417 with a scanner and I want to decode it. Does anybody know any solution to integrate with LabView?
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Antonio,
I don't know much about the PDF 417 however there are some examples on NI's site about generating barcodes in LabVIEW.
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I want to store data in fifo in host and read this data in target

i have implemented aconvolutional encoder using fifo but fifo doesn’t read data in target

Spoiler (Highlight to read)
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host.PNG ‏13 KB
target.PNG ‏25 KB

Create a continuous data stream from C++, and read it in LabView

Hello all.
I'm working on a project which involves connecting to a motion tracker and reading position and orientation data from it in realtime. The code to get the data is in c++, so I decided that the best way to do this would be to create a c++ DLL file which contains all the necessary functions to first connect to the device and read the data from it, and use the Call Library Function node to feed this data into Labview.
I'm having trouble though, since ideally I would like a continuous stream of data from the c++ code into Labview, and I'm not sure how to achieve this. Putting the call library function node in a while loop seems like an obvious solution, but if I do it this way I would have to reconnect to the device every time I get the data, which is quite a bit too slow.
So my question is, if I created c++ function which created a data stream, could I read this into Labview without having to continually call a function? I'd prefer to only have to call a function once, and then read the data stream until a stop command is given.
I'm using Labview 2010, version 10.0.
Apologies if the question is poorly phrased, many thanks for your help.
Dave
Solved!
Go to Solution.

dr8086 wrote:
This method sounds like an excellent suggestion, but I do have a few questions where I dont think I've understood fully.
From what I understand the basic premise is to use one call library function node to access a DLL which creates an instance of the device object, and passes a pointer too it into labview. Then a seperate call library function node would pass this pointer to another DLL which could access the device object, update it and read the data. This part could be in a while loop and carry on reading the data until a stop command is given.
That's it. I'm including some skeleton code as an example. I'm also including the code because I don't know how much you have experience with multi threading, so I'm showing how you'd have to use critical sections to guard the interactions between threads so that they don't lead to issues.
// exported function to access the devices
extern "C" __declspec(dllexport) int __stdcall init(uintptr_t *ptrOut)
*ptrOut= (uintptr_t)new CDevice();
return 0;
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return ((CDevice*)ptr)->get_data(vals, size);
extern "C" __declspec(dllexport) int __stdcall close(uintptr_t ptr, double last_vals[], int size)
int r= ((CDevice*)ptr)->close();
((CDevice*)ptr)->get_data(last_vals, size);
delete (CDevice*)ptr;
return r;
// h file
// Represents a device
class CDevice
public:
virtual ~CDevice();
int init();
int get_data(double vals[], int size);
int close();
// only called by new thread
int ThreadProc();
private:
CRITICAL_SECTION rBufferSafe; // Needed for thread saftey
vhtTrackerEmulator *tracker;
HANDLE hThread;
double buffer[500];
int buffer_used;
bool done; // this HAS to be protected by critical section since 2 threads access it. Use a get/set method with critical sections inside
//cpp file
DWORD WINAPI DeviceProc(LPVOID lpParam)
((CDevice*)lpParam)->ThreadProc(); // Call the function to do the work
return 0;
CDevice::~CDevice()
DeleteCriticalSection(&rBufferSafe);
int CDevice::init()
tracker = new vhtTrackerEmulator();
InitializeCriticalSection(&rBufferSafe);
buffer_used= 0;
done= false;
hThread = CreateThread(NULL, 0, DeviceProc, this, 0, NULL); // this thread will now be saving data to an internal buffer
return 0;
int CDevice::get_data(double vals[], int size)
EnterCriticalSection(&rBufferSafe);
if (vals) // provides a way to get the current used buffer size
memcpy(vals, buffer, min(size, buffer_used));
int len= min(size, buffer_used);
buffer_used= 0; // Whatever wasn't read is erased
} else // just return the buffer size
int len= buffer_used;
LeaveCriticalSection(&rBufferSafe);
return len;
int CDevice::close()
done= true;
WaitForSingleObject(hThread, INFINITE); // handle timeouts etc.
delete tracker;
tracker= NULL;
return 0;
int CDevice::ThreadProc()
while (!bdone)
tracker->update();
EnterCriticalSection(&rBufferSafe);
if (buffer_used<500)
buffer[buffer_used++]= tracker->getRawData(0);
LeaveCriticalSection(&rBufferSafe);
Sleep(100);
return 0;
dr8086 wrote:
My main concern is that the object may go out of memory or be deallocated, since it wouldnt be held in any namespace or anything.
Since you create the object with new, the object won't expire until either the dll is unloaded or the process (LabVIEW) closes. So the object will stay valid between dll calls provided LabVIEW didn't unload the dll (which it does if the VIs are closed). When that happens, I'm not exactly sure what happens to live objects (i.e. if you forgot to call close), I imagine the system reclaims the memory but the device might still be open.
What I do to make sure that everything gets closed when the dll unloads before I could call close and delete the object is to everytime I create a new object in the dll I add it to a list, when the dll unloads, if the object is still on the list I delete it.
dr8086 wrote:
I also have a more general programming question about the purpose of the buffer. Would the buffer basically be a big table of position values, which are stored until they can be read into the rest of the VI?
Yes, see the example code.
However, depending on the frequency with which you need to collect data from the device you might not need this buffer at all. I.e. if you collect a sample about every 100ms then you could remove all threading and buffer related functions and instead read the data from the read function itself like this:
double CDevice::get_data()
tracker->update();
return tracker->getRawData(0);
Because you'd only need a buffer and a seperate thread if you collect data at a high frequency and you cannot lose any data.
Matt

How to read a data file combining strings and data

Hello,
I'm having a data file combining strings and datas to read. I'm trying to read the filename, time, constants and comments into four seperate string indicators (the lines for the comments varies for different files). And read the data into a 2-D numeric array. How can I do this? Is there any function that can serch special characters in the spreadsheet file so I can exactly locate where I should start reading the specific data. The following is how the data file appears. Thank you very much.
Best,
Richard
filename.dat
14:59:00 12/31/2009
Sample = 2451
Frequency = 300, Wait time = 2500
Temperature = 20
some comments
some comments
some comments
some comments
some comments
7.0000E+2    1.5810E-5
7.0050E+2    1.5400E-5
7.0100E+2    1.5500E-5
7.0150E+2    1.5180E-5
Message Edited by Richard1017 on 10-02-2009 03:10 PM
Solved!
Go to Solution.

Hi,
     I'm fairly new to the NI forums too and I think you just have to wait longer. Your post was done right. I do a similiar function as to what you are talking about except I read in numbers from a file. I create an ini file (just a notepad file of type *.ini) that is is set up with sections inside brackets [] and keys with whatever name followed by an = sign. You may be able to use a *.dat file too, I just haven't. Then the vi attached goes to that file and reads the keys from those sections. You just repeat for the different sections and keys you want to read. You can use similar provide VI's to write to that same file or create it. Let me know how that works.
Attachments:
Help1.ini ‏1 KB
Help1.vi ‏10 KB

Create and read byte data

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