Tcp data b/w labview and c++
Hi
i am trying to establish TCP connection b/w LABVIEW and C++ program. Server is established in C++ while client is implemented in labview.Although connection is successfully establish b/w server and client, both are unable to correctly understand data send/receive among them. Forexample if i want to send an int type send_array from server, i use standard WINSOCK function "send" like that:
send(AcceptSocket,(char*)send_array,129*4,0);
but when client in labview receive this array, it shows unexpected values.As a client, I used "simple data client.vi" with one modification i.e. as sent data size(129*4 bytes) was fixed, only one TCP read was used .
Same problem exists if i send data from client to server.
Kindly help me
Best Regards
Solved!
Go to Solution.
It's probably an big/little edian problem. If you are using the Flatten/Unflatten from String functions, you can specify which to use.
Similar Messages
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Monitor/capture tcp data between a server and client
Hi
I am doing a server/client TCP connection between my laptop and another computer running the server program. With my client program I am able to send commands to the server to which it reacts. However I do not know what the commands are (I just press a button in the client GUI and the command is sent), so my initial thought was that, maybe I was able to monitor/capture the strings/bytes/integers commands, which is send over the TCP/IP. There are only these two computers on the network, so no problem in other traffic there. FYI, they are connected with a wireless peer-to-peer connection.
My problem comes from the manufature of the software making a crabby manual, so really the commands in the manual, which I was supposed to send with my own TCP vi, are just impossible to understand, and don't get me started with their support :-)
SO, any suggestions if it is possible to capture what is sent over the TCP when I press a button in my client GUI?
LabVIEW 8.6 / 2009 / 2010
Vision Development Module 8.6 / 2009 / 2010
VBAI 3.6 / 2010Matthew Williams wrote:
Wireshark, http://www.wireshark.org , will capture data off the network and sort/display/categorize.
I don't know how well it will work in a wireless environment, we usually use a wired hub (not switch).
Matt
Hi Matt
I have just tried Wireshark, I get a lot of data, so I just have to use a bit of time figuring out what is what, but good program to monitor the LAN connection also wireless. I can monitor all the packages between the client and server. It looks like there is a bunch of data just from keeping the connection active, but again I have to dig a bit deeper before I can say anymore:-)
MikeS81 wrote:
Hi SCMAJA,
another way is to build your own TCP/IP Server with LabView and receive with it the commands send with your client program.
Mike
Hi Mike
Yeah I tried that right now using the TCP Communicator - Passive example, unfortunately the connection between the client and server is kept alive using some commands, so the only command I can get to read is the connect command, because the client then refuses the connection because there is no "right" answer/repsonse from the server :-(
edit:
I just got in touch with the support, and got some of the commands to work. I had to make some crazy command with a header first, then size and last my command, all converted from DEC to HEX.. Not easy to figure out :-)
Message Edited by SCMAJA on 02-08-2008 04:29 PM
LabVIEW 8.6 / 2009 / 2010
Vision Development Module 8.6 / 2009 / 2010
VBAI 3.6 / 2010 -
TCP/IP communication between labview and microchip board
Hi
I have a microchip board which sends out data over the Ethernet. I have to read this data and use for further mathematical computations on it. So I decided to use some available examples on Labview. I find that all examples come as a pair, client-server. But in my case the board will be the server ( providing data continuously) and Computer with Labview will act as a client (Continuous receiving). Is there any readily available example on Labview for this purpose. If not, can you please suggest which example I need to modify for my purpose? Thanks
Arvindarvind3tthiru wrote:
Hi Greg, thanks for the reply. I am connecting to a PICDEM.NET2 board which is sending data through its ethernet port. I know the port number and the IP address of the board. I want labview to listen to this port and store the incoming packets. I am not sure how LABVIEW disintegrates the TCP packets and takes only the data out. Since I am not seeing anything on the LABVIEW client, so I am starting to think that TCP Client on LABVIEW may have some prescribed packet format which is not the format in which I am sending my data in. Please enlighten me if I am wrong. If you need more information, please tell me what you will need, I will provide you immediately.
Thanks
Arvind
LabVIEW has no "predesribed" packet format, and it doesn't take packets apart. LabVIEW operates at the application level, so the OS is responsible for providing the data that's contained in the packet to LabVIEW. LabVIEW just sees the data in the packets.
Have you verified that a connection is actually being made? You said that the LabVIEW should listen to this port. Did you create a listener on the LabVIEW side? Does the microchip code indicate a connection? You may want to use Wireshark to capture the packets to see exactly what is going on. -
First let me say that I am new to labview, please bear with me. I want to use Labview to querry a iDRX thermocouple signal conditioner using tcp/ip. The signal conditioner is wired to a EIS-2B server. The server is at 198.162.10.53 and port 2000. The data request command is *10x01\r and the expected data to be returned is 01X01+00064.6 (or whatever the actual temperature is). The conditioner and server are working and testing correctly using the iDRX supplied software.
My attached vi runs, creates no errors, but returns no data either. I can find many examples of how to set up a listener, but I need to QUERRY and then RECEIVE the data.
Thanks in advance.
Attachments:
Alyeska 4.vi 15 KBHi Alyeska! Welcome to the forums!
I took a quick look at the VI, and I have four quick suggestions for
you that may give us some information about what is happening.
You may be experiencing an error that just isn't detected by the VI -
normally we add an error handling VI at the end of program execution to
report any errors that occurred. Also, it's helpful to have a way
to exit the while loop so that the program can finish executing if an
error occurs. Third, you may need to introduce a delay between
the query and the read command to allow the server time to process and
respond to the request. Lastly, if you already know how long the
return message will be, you should wire this length to the Bytes to
Read input of the TCP Read VI so it knows to return the data once it
receives that number of bytes. I've attached a modified version
of the VI incorporating these - give this a try, and let us know if you
still see an error, and if so, what error. Also, if you haven't
taken a look at it already, there are excellent resources for learning
LabVIEW at the LabVIEW Fundamentals page - it's a great way to introduce yourself to LabVIEW and get up to speed quickly.
Cheers,
Matt Pollock
National Instruments
Attachments:
Alyeska 4.vi 19 KB -
i am receiving the data through the rs232 in labview and i have to store the data in to the word or text file only if there is a change in the data. I have to scan the data continuasly. how can i do that. I was able to store the data into the text or word file but could not be able to do it. I am gettting the data from rs232 interms of 0 or 1. and i have to print it only if thereis a change in data from 0 to 1. if i use if-loop , each as much time there is 0 or 1 is there that much time the data gets printed. i dont know how to do this program please help me if anybody knows the answer
I have attatched the vi. Here in this it receives the data from rs232 as string and converted into binery. and indicated in led also normally if the data 1 comes then the led's will be off. suppose if 0 comes the corresponding data status is wrtten into the text file. But here the problem is the same data will be printed many number of times. so i have to make it like if there is a transition from 1 to o then only print it once. how to do it. I am doing this from few weeks please reply if you know the answer immediatly
thanking you
Attachments:
MOTORTESTJIG.vi 729 KB -
Questions on Saving and mining data with Labview and DIAdem
Hi,
I am sampling two signals at 200k sampling rate. I am trying to save the data on harddisk and analyzing the data using DIAdem.
If I save the data using mesurement file format .tdm and .lvm, the file size will be about 4 Gigabytes for only 10 mins' acquisition. It is very slow to process it.
I used the software Clampex and pCLAMP(Axon Instruments) before. At the same 200k sampling rate and also acquiring two signals, these programs save the data as .atf format and the size is only 400 MB for 10 mins' acquisition.
I wonder if there is also a good way to handle this situation using Labview and DIAdem, and how to do it?Hi, Jonathan:
I tried the TDM binary file format. The file size is 800 MB per min acquisition and it will take a long time to just open these files. For my application, I have to take data for several hours. I am looking for a way to reduce the size of files.
Is there any other type of file format that can reduce the size significantly and can be handled easily? -
How can I calling LabView DLL within LabView and pass similar Data Types?
I am trying to use an Instrument Driver, which is created in LabView6.1 as a DLL. At this point I have only LabView to test this DLL. I was wondering, is there easy way to find out what sort of Parameter or Data Type I should be using.
How can I pass the following data with in LabView:
LVRefnum as Type?
LVBoolean as Type?
TD1 (a structure) as Type?
It is funny to see that I am able to create a DLL in labview but having trouble calling it within LabView. I thought, it would be easier to test the DLL within the same environment.
Basically, I am more worried about the VISA calls that are used in the driver to communicate with instrument. Because, there is no link to �VISA32.dll� in
the header file, is that handled by the LV Run-time engine? I guess more details are needed on using the LabView DLL within LabView from National Instrument Technical Support.
Attachments:
RL5000.h 1 KBA LVRefNum seems to be an unsigned long data type (32bit). You can cast it
in LV then use that as a parameter to call the DLL. (an Occurrence type
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When you created the DLL what was the resulting type for the LVRefNum?
Happy Holidays
"Enrique" wrote in message
news:[email protected]..
> I see...
>
> After doing some research, it seems to me that there is no easy way to
> find out the type of data, other than looking at the header file and
> have documents like Using External Code in LabVIEW handy. The
> following information is from that document:
>
> LVBoolean is an 8-bit integer. 1 if TRUE, 0 if FALSE.
>
> LabVIEW specifies file refnums using t
he LVRefNum data type, the
> exact structure of which is private to the file manager. To pass
> references to open files into or out of a CIN, convert file refnums to
> file descriptors, and convert file descriptors to file refnums using
> the functions described in Chapter 6, Function Descriptions.
>
> I know you are creating a dll in LabVIEW, but I am pretty sure the
> information applies as well and is useful. For your dll this can be
> interpreted that, rather than passing a LVRefnum, try passing the file
> descriptor.
>
> From the header file, is can be deduced that TD1 is a cluster in
> LabVIEW.
>
> You are right in saying that "more details are needed on using the
> LabView DLL within LabView from National Instrument Technical
> Support.".
>
> Enrique -
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;
extern "C" __declspec(dllexport) int __stdcall get_data(uintptr_t ptr, double vals[], int size)
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 -
I have written a binary file with a specific header format in LABVIEW 8.6 and tried to Read the same Data File, Using LABVIEW 7.1.Here i Found some difficulty.Is there any way to Read the Data File(of LABVIEW 8.6), Using LABVIEW 7.1?
I can think of two possible stumbling blocks:
What are your 8.6 options for "byte order" and "prepend array or string size"?
Overall, many file IO functions have changed with LabVIEW 8.0, so there might not be an exact 1:1 code conversion. You might need to make some modifications. For example, in 7.1, you should use "write file", the "binary file VIs" are special purpose (I16 or SGL). What is your data type?
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How to save data aquired with NI mydaq and save it in a data base using Labview?
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Attachments:
PFE.vi 223 KBThere is a database toolkit for LabVIEW. I don't think it is a free download however. With the Data Manipulation toolkit, you can integrate with most databases that use the ODBC protocol.
If you don;t need anything fancy, you can write the values out to file using the write/read spreadsheet VIs. If the file is [COMMA] or [TAB] delimited, you can import it into your database with ease.
Another approach is to format you output to a text file as SQL, and import the records that way.
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Data logging optimization function in LabVIEW and SignalExpress
Hello, everyone! I and a colleague have assembled the attached VI,
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The chamber runs for weeks at a time, though, so I have a constraint.
Instead of continuously logging all the environmental data (which would yield
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I attempted to use the Time Delay function to control the Write Measurements
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I recently discovered the powerful data review and reporting tools that
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would like to use a SignalExpress express VI to record the measurements instead of the more primative Write Measurements, but, I’m not sure how to implement this in my VI. For example, would I make a data acquisition VI in SignalExpress for all my sensors, export to LabVIEW, and use that to replace the current DAQ structure in my VI? (Because the chamber VI is interactive, I'm pretty sure that porting the LabVIEW VI to SignalExpress wouldn't work out well.) And I’m
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Any advice would be much appreciated!
Attachments:
Chamber VI.vi 789 KB
Cycle Analysis.vi 300 KBHi, Sarah. Yes I definitely plan to use LabVIEW for the majority of my data acquisition and logging. I apologize, I think I probably should have broken my post into two separate posts for clarity, as my major concern is being able to set how often LabVIEW logs the environmental data (viewing the logged data in SignalExpress would be nice, but not a requirement).
As I explained before, I'd really like to be able to set up a system that records the environmental condtions at regular time intervals, say every 30 minutes, or if my "Case Structure for CO2 and Pressure" status changes (such as from "Normal Conditions" to "High CO2".
As an example, attached is a boolean structure (TimedWritedMeasurements.vi) that I came up with to record a simulated signal every 5 seconds (5000 ms). Once I can get it to work, I would connect the boolean to my environmental sensor outputs and CO2 and Pressure case structure in my Chamber VI.vi that I attached in my first post.
My problem is I can't seem to get the Trigger and Gate function to work the way I'd like. I'd like the Wait (ms) function to trigger the Trigger and Gate function every 5 seconds to change the case structure in the TimedWriteMeasurements.vi to "True", thereby causing the Write Measurement function to record the environmental conditions. Then I'd like the case structure reset to false, until it's triggered to true in another five seconds. Can anyone point me in the right direction?
Attachments:
TimedWriteMeasurements.vi 84 KB -
Without NI DAQ device- how to get data from MSP into labVIEW and process it
Hi,
I do not have an NI DAQ device. I have an MSP430 and my sensor is an ADXL335 Accelerometer. How do I get data from my MSP into labVIEW and process it?
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Thanks in advance,
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I am using LV 8.2 and TS 3.5.
I have an existing Custom Data Type in TestStand and I want to make a LabView Type Def. The TS DataType contains 11 elements: a Visa Resource Container of 2 elements (String, DeviceName and Number, Session), 9 Numerics and 1 String Array. For Backwards compatability, I cannot modify the TestStand DataType.
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The latest version of the NI GXML Library is availble in VIPM on the NI LabVIEW Tools Network repository.Francesco, Thank you for the feedback. With this component it was my intention to make a more "terse" version of the LabVIEW Flatten to XML VI that was also supported on RT and that gave the user more flexbility regarding the structure of the parsing type definition. I think you are right that the XML parser is not compliant to section 2.11 of the XML spec. The parser does specifically looking for a #D#A and this appears to be an oversight on my part. Please confirm for me, the specifcation is saying that the XML parser should be able to recognize three possibilities as an "end of line" character: #D#A, #D, or #A. Am I reading this right?There are more efficient (and in some cases much more efficient) ways of sharing data between LabVIEW and LabVIEW: some examples are flattened binary strings and the datalog binary format. XML is slower than these optons but the upside is that it is human readable. Furthermore XML is inherently hierarchical which is convenient for complex data structures like clusters of arrays of clusters, etc. If you don't care about human readability then you are correct XML doesn't make as much sense.I will return to the GXML source code and try to fix this in the near future but I would hope that instead of creating yet another custom VI from scratch that you could reuse what I have provided for you. I included enough documentation in the source code so that users could make some modificiations themselves. The target application for this reference library was LabVIEW to LabVIEW communication. As such I documented the schema on the dev zone document from a LabVIEW perspective. It includes all the supported datatypes and all the supported data structures (cluters, arrays, multidimensional arrays, clusters of multidimensional arrays, etc.) I do see some value in making a more conventional XML spec but the time investment required didn't really line up with my intended use case. Were there any other downsides to GXML that I have missed? Best Regards, Jeff TippsSystems Engineer - Sound and VibrationMessage Edited by Jeff T. on 04-21-2010 10:09 AM
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Logging data with LabView and FP-DI-330
Hi,
I have a problem.
I am monitoring 6 ports of the FP-DI-330, via LabView.
I have it runing in a while loop that desides the update frequency. It then get stored in a txt file with the time in Hours, Minutes and Seconds. I need the time in milli seconds to skill betwen the diferent input times. Because the different input´s can come in the same second.
i have added the vi file
Enyone have an sugestion?
Attachments:
FP_DI_330.vi 75 KBFirst of all...
i will throw away the boolean display. But the Spreadsheet is the formation of the logfile is it not?
I will need that to get the data nicely organized.
I dont know how to get milli seconds displayed enywhere. If i use for example the tick count (MS) it starts with a number around 3287101, should it not start with 1 and then count up?
"Further in your vi, you forgot to connect the current time to the Get Date/Time string. Can't you use the millisecond values for building the time-values?"
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I would think th
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