Using Matlab in Labwindows/CVI

I have a matlab .m file that runs a function. In my Labwindows software, I want to be able to run this function. Is this possible? Thanks.

Hi Kamkon,
Have you had a chance to look into the example posted by Anna? I've come across discussion forums regarding how to use MATLAB dlls in LabWindows CVI. They are listed below. I hope this is of some help to you.
http://forums.ni.com/t5/LabWindows-CVI/How-to-use-a-Matlab-DLL-in-CVI/m-p/548105?requireLogin=False
http://forums.ni.com/t5/LabWindows-CVI/Linking-Matlab-generated-lib-files/m-p/283814?requireLogin=Fa...
Creating a MATLAB dll is somewhat outside the scope of our suppot. However, I have found a third party link on this topic. Hopefully, it will point you in the right direction.
http://www.mathworks.com/support/solutions/en/data/1-18CBI/index.html?solution=1-18CBI
Regards.
Josh L.
Applications Engineer
National Instruments

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How does the URL of DataSocket constitute?And how to use it in LabWindows/CVI ?

Hi ！
There's a problem puzzled me some days.How does the URL of DataSocket constitute ? And how to use it in LabWindow/CVI ?
For example.I have downloaded a code in http://zone.ni.com/devzone/cda/epd/p/id/3787.I want to make it work properly.So I configure my DataSocket Server Manger according to the URL of this statement.
DS_Open ("dstp://weather.natinst.com/weather/current",
DSConst_ReadAutoUpdate, DSCurrentCallback, NULL,
&dsCurrentHandle);
My DateSockket Server Manger is configured as:
However,it could not work properly when I debug it.
There's a introduction at the top of the code."You may need to replace the references to weather.natinst.com to 130.164.140.10 if the DNS isn't working properly."So,I modified the statement into
DS_Open ("dstp://130.164.140.10/weather/current",
DSConst_ReadAutoUpdate, DSCurrentCallback, NULL,
&dsCurrentHandle);
but,it did work properly.
We want to communicate with other computers via the URL of DataSocket in LabWindows/CVI.Whereas,how could we make it ia the URL ?
If anyone could help me solve this problem,I would appreciate it very much !
Best regards.
xiepei
I wouldn't care success or failure,for I will only struggle ahead as long as I have been destined to the distance.

Hi !
Thank you very much for your reply! I will accept your advice.
Besides,I have another question.If I want to visit other computers or other websites，how does the URL of DataSocket I constitute ? Does the URL has any relation with the DataSocket Server Manger ？If does,how to configure the DataSocket Server Manager to let them connected.If they have no relation,how to use the DataSocket Server Manger ?
After all,I want to know how to use it in LabWinows/CVI ？
Thank you very much !
Best regards!
I wouldn't care success or failure,for I will only struggle ahead as long as I have been destined to the distance.

Permission Denied Error when calling Matlab script from LabWindows/CVI

Hello,
I am reading in data from a DAQ and am writing it to a .csv file in LabWindows/CVI. I am then sending this data to Matlab to be filtered. I would like the filtered data to be accessed by LabWindows/CVI so that I can display it as a strip chart. I have gotten everything to work except the writing to a file in a Matlab script that is called from LabWindows/CVI. I am basically using the shipped example in found in the activex demo. (http://zone.ni.com/devzone/cda/epd/p/id/2994). I select the script that I want to run and each time it tries to open a file with write permissions I get a "Permission Denied" error. This occurs when using fopen() in Matlab. I have also tried using csvwrite() as well as dlmwrite(). Each one gives me a similar error. The script currently does not try to do any data processing. It just opens the file, if it is successful it then prints "hello" and then closes it. The script works well when it is run in Matlab, just not when it is called in LabWindows/CVI. Below is the script. Any thoughts, comments or suggestions are greatly appreciated. I am also open to using other approaches for sending data between Matlab and LabWindows/CVI. Thanks in advance!!
fclose('all');
[file, errmsg] = fopen('out.txt', 'w');
if(file<0)
   disp(errmsg)
else
   fprintf(file, 'hello');
   fclose('all');
end;
[file, errmsg] = fopen('out.txt', 'w');
if(file<0)
disp(errmsg)
else
fprintf(file, 'hello');
fclose('all');
end;

I am using Windows 7. I am running CVI as an administrator and was able to get rid of the "Permission Denied" error by going into the User Account Controls in windows and changing it to "Never Notify". However, this did not fix the problem of Matlab not being able to write to a file when the script is run from CVI. In the Matlab code below, It now gets in to the "else", suggesting that fopen() returns a good file handle. After getting in to the else statement, it will not actually write to the file, nor does it create it. However, I can make changes to the plot settings and those appear. Everything is functional when run from Matlab but when run from CVI, things get screwy with opening the file for writing. It handles the read well. It seems like there would have to be some file permission errors but, in the CVI program, I open and write to the file "in.csv". Any help is greatly appreciated.
clear;
fclose('all');
t = zeros(1000);
t = csvread('in.csv');
for i=1:1000
   t(i) = t(i)*4;
end;
[file, errmsg] = fopen('out.txt', 'w');
if(file<0)
   disp(errmsg)
else
   fprintf(file, 'goodbye');
   for i=1:1000
   %t(i) = t(i)*3;
   fprintf(file, '%f,', t(i));
   end;
   fclose(file);
   plot(t/3, t);
   ylabel('t');
   xlabel('Time (s)');
   title('Is this really working?!?');
end;
Thanks,
Chris

Test NI cDAQ-9188 using LabWindows/CVI

I am looking for help to create test for cDAQ-9188 with DIO and AIO modules.
Would you please advise with information as follow:
1. Adding device driver to a project.
2. Sample of UI.
3. Sample of test script for DO (AO) control.
4. Sample of test script for DI (AI) acquisition.
Thank you.
Sincerely,
Sam.
[email protected]

There is a tutorial on using DAQmx with LabWindows/CVI here: http://zone.ni.com/devzone/cda/tut/p/id/2931. That is probably a good place to start.
Another good article to check out is the NI Ethernet Data Acquisition Overview here: http://zone.ni.com/devzone/cda/tut/p/id/7374.
As far as examples go, there are several text-based examples (as long as you have DAQmx installed) located at: Start Menu >> All Programs >> National Instruments >> NI-DAQ >> Text-based Code Support >> ANSI C Examples.
National Instruments

Visual Studio or LabWindows/CVI?

I have a bit of a dilemma.
I currently own Visual Studio 2010, IMAQ Vision Development Module 2013, and Measurement Studio (not sure of version). I currently do all of my programming in VB.net. Because IMAQ VDM is stuck in .Net framework 3.5 and there will be no further .net development by NI, I need to plan for the future. My applications need run on Win 8, 9, 43, or whatever my company decides to migrate to from Win 7.
My understanding is that the NI modules I currently own will work with LabWindows/CVI. Correct? I also believe I can use them with C++ using the VS IDE. Is this also correct?
Within my applications I do a lot of interfacing with Excel, writing text files, and interfacing to non-NI devices (cameras, DAQs, scanners, etc). I am able to do these things pretty easily using VB.net using vendor-provided SDK's.
Therefore, my question is this...given the investment I have in software already, do I gain anything by migrating to LabWindows/CVI? What do I lose?
I should point out that regardless of the path I choose I will need to bone up on my programming skills in the corresponding language.
Thanks for all your help!

Hello Steverino!
Here are some advantages when using LabWindows/CVI over Visual Studio, which make the product more suitable for various industry-related applications:
You are correct, LabWindows/CVI integrates with the NI platform: NI hardware and software, like TestStand or LabVIEW (e.g. debugging source code from one software to another, seamlessly).
NI hardware and third-party hardware connectivity.
OpenMP support.
CVI integrates with intrument control.
CVI Run-Time benefits from User Protection.
Run-Time checking (e.g. for uninitialized variables).
Scientific User Interface Controls and GUI Editor.
Advanced debugging capabilities:
Remote debugging support from ADE.
Real-Time debugging support from ADE.
Memory leak detection using the LabWindows/CVI Resource Tracking Window.
Just-In-Time debugging.
Deployment: build custom installers and patches that you can ship as stand-alone easy-to-use installers.
LabWindows/CVI libraries: Advanced Analysis, Toolbox, Connectivity (Network Variables, Network Streams, DataSocket), etc.
Support for LabWindows/CVI Toolkits: SQL Toolkit, Vision, PID, RT.
Regards,
- Johannes.

How to set a DMA transfer type for PXIe-6536 in LabWindows/CVI?

I have a PXI chassis PXIe-1078 with a controller PXIe-8115 running under Windows 7. The digital output board is PXIe-6536.
I use a function DAQmxSetChanAttribute to set a property DAQmx_DO_DataXferMech to a value DAQmx_Val_DMA, since I want to use a direct memory access data transfer. This wokred well with a PCI-6534 board using the same LabWindows/CVI code before migrating it to the PXIe system.
Unfortunately, running this code on the PXIe system reports a DAQmx error -200452: "Specified property is not supported by the device or is not applicable to the task".
The task is created in the following simple way (the board name in MAX is 'Dev1'):
   DAQmxCreateTask ("digTask", &digitalTask);
   DAQmxCreateDOChan (digitalTask, "Dev1/port0:3", "DIG_CHANNELS", DAQmx_Val_ChanForAllLines);
   DAQmxSetChanAttribute (digitalTask, "", DAQmx_DO_DataXferMech, DAQmx_Val_DMA, 15);
How can I solve this problem? How is it possible to choose between different transfer types?
Thank you in advance for any hint!

Hi CavityQED,
The PCI-6534 is a "Digital I/O" board while the PXIe-6536 is a "High Speed Digital I/O" board, that's why they don't have the same properties.
By the way you can use DMA transfer with this method :
http://zone.ni.com/reference/en-XX/help/370520J-01/hsdio/direct_dma/
Let me know if it helps you.
Regards.
Mathieu_T
Certified LabVIEW Developer
Certified TestStand Developer
National Instruments France
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LabVIEW Tour
Journées Techniques dans 10 villes en France, du 4 au 20 novembre 2014

How do I send e-mail to a distribution list using LabWindows/CVI?

I need to be able to send e-mail to a user-defined distribution list using LabWindows/CVI? Has anyone done this? Any ideas where I could look?

I commented on something similar to this awhile back. My issue was that I had the base version and didn't have the Internet classes. So this external app worked like a charm
It has a lot of command-line inputer options to use as well.
http://forums.ni.com/t5/LabWindows-CVI/Need-Help-for-Sending-Email-with-LabWindows-8-5-or-9/m-p/1095...

How to use CAN256 and CAN257 in Labwindows CVI?

I am trying to learn about CAN programming in LabWindows CVI. None of the samples do anything other than generate cryptic error messages. I do not have a card or interface device yet, but reading in the help files I found this:
"NI-CAN provides a virtual CAN card with two interfaces, CAN256 and CAN257. The two virtual interfaces are connected by a virtual bus. When you write CAN frames to one virtual interface, those frames are received by the other virtual interface, and can be read as channels. This feature allows you to read and write CAN data in the same manner as two real CAN interfaces connected by a real CAN cable. The conversion does not require real NI CAN hardware, and your application is not required to check for specific CAN IDs."
I modified the Waveform ouput project and add CAN256 to the dropdown in the uir file. However when I run it, I get the same error message as always, error -1074388725.
Is there an example CVI code someplace to demonstrate the use of these virtual channels?

Thanks Drew.
Ultimately, my customer provided me with a WriteCAN256.vi and ReadCAN257.vi that were perfect for my needs. The WriteCAN256.vi along with my NI USB 8473s allowed me to provide data collection on multiple CAN devices and to verify that my Software can handle all data types from CAN devices.
Note: My customer allowed me to share his .vi's. They are enclosed ...
Best Regards,
Don W
Attachments:
CanBus Read (Frames)_85.vi ‏55 KB
CanBus Write (Frames)_85.vi ‏48 KB

How to use the checksumdll.lib in LabWindow/CVI to create CRCChecksum();

Hi All,
Any one know how to use the checksumdll.lib in LabWindow/CVI to create CRCChecksum() ?
Thank you.

Do you ave some documentation about that dll?
Have you looked into dll properties searching for vendor name? Maybe you can look int vendorìs site and obtain some help.
Ultimately: are you forced to use that dll or can you use any software to calculate the checksum? There are several CRCs that you can use: provided you know which is the type used you could find an algorithm to calculate the CRC and check an existing one.
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

I would like to know how to transform an API C++ application in MFC C++ application to use the measurement studio components or Labwindows CVI

I don t know the way used to transform a C++ with API program in an MFC application using measurement studio or Labwindows CVI.
Thank you for you help.

You can use the Measurement Studio Add/Remove Components Wizard to add Measurement Studio components to your C++ application. For more information, see the "Adding and Removing Components from Measurement Studio Projects Using a Wizard" topic in the Measurement Studio reference. You can find it in the table of contents under:
Visual C++ Help
Tutorials
Measurement Studio for Visual C++ 6.0
If you're using the Measurement Studio update for Visual C++ .NET, this topic will be under:
Visual C++ Help
Tutorials
Measurement Studio for Visual C++ .NET
- Elton

I used to working with Labwindow CVI and i would like to know how can i use the commands "loadpanel" and "Displaypanel " in Labview. Using Invoke Nodes?

I want to make another panel appears and runs, but i don´t want to use a subpanel. So, i would like to use somenthing similar to Loadpanel and Displaypanel, that you can use in Labwindows CVI, but in Labview, is ti possible?I hope your answers, thank you!!!

Hi Bichillo,
I posted an example here.
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=137&HOID=50650000000500000014570100&HTHREAD=000087828&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
It demonstrates how to do what you are asking.
I do not mind you laughing at the code.
Have fun!
Ben

LabWindows/CVI 2013 SP2 stops working when I try to open a file using the project file menu.

I have windows 7 on my system and sometime late last year I starrted getting a Windows dialog telling me that LabWindows/CVI has stopped working when I try to open a file from the project file menu. I also get an error when I run a project debug mode and use a selectFilePopup in the code. The error says, "The program has suspended execution at address 0x75D5025E. No source line information is available." I've tried removing and reinstalling CVI to no avail. Any suggestions?

Constantin,
Thank you for your response. I've attached screnshots showing the version details for kernal32.dll and ntdll.dll. I also looked at the updates to see which might have been installed when the problem started. Unfortunately there are 15-20 updates every month. I didn't take note of when the error started to occur. At first it only affected my ability to open files from within the project (i.e. file->open->Source, etc). Then I went back to modify a project that had a SelectFilePopup and found that that wouldn't work either.
Attachments:
ntdll.dll version.jpg ‏15 KB

How to access the result list in teststand after execution using labwindows/cvi

I am developing a user interface in labwindows/cvi that runs multiple teststand sequence files and would like to combine their reports (generated in teststand) into a single file at the end of a UUT. What is the best way to do this? At the moment, I'm trying to access the result list local variable after the execution has ended using API calls from labwindows/cvi and an end-of-execution callback event but those run-time variables do not exist anymore. How do I get a hold of the result list array at the end of an execution? I would like to grab this variable and pass it along from sequence to sequence using labwindows/cvi and not teststand itself. Is this possible? Any help would be great.
Thanks in advance,
Luis

Hey Luis,
Check out the response to this thread at the NI TestStand board here!

Documentation on How to Develop an OPC Client Using LabWindows/CVI?

What documentation is there on how to develop an OPC client application using LabWindows/CVI? What tutorials, if any, are there? What reference manuals, if any are there?
I am completely new to LabWindows/CVI. I will be starting soon with the tutorial, "Getting Started with LabWindows/CVI". However, our application needs to communicate with an RSLinx OPC Server. Any documentaiton on how to learn to do this would be very much appreciated.

http://www.ni.com/white-paper/4626/en/ Just did a quick google and this came up, Labwindows CVI and Labview are quite different but I usually look at Labview examples then try take the general idea from the example and apply it in CVI, hope this helps

Using DLLs created with LabWindows/CVI 8.0.0 in LabWindows/CVI 8.0.1

Hi,
I have created a project containing some methods with LabWindows/CVI 8.0.0 and then build the project and generated the DLL and LIB files. These DLL and LIB files are working fine in another projects created in LabWindows/CVI 8.0.0 (even on another machines).
But when I use these DLL and LIB files in a project created with LabWindows/CVI 8.0.1 on another machine and try to call the methods of these files, the following error occurs: -
"The program has caused a 'Unknown' fault at 001B:7C812AFB"
Is this error occurs due to ther version mismatch or there is some other problem?
Please help me to resolve this issue.
Thanks,
Sarabjit Singh

Judging from this, I don't think NI has a newer version of this tool:
http://forums.ni.com/t5/Measurement-Studio-for-VC/Convert-project-from-LabWindows-CVI-to-Visual-Stud...

Using Matlab in Labwindows/CVI

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