LabWindows/CVI Process Communications

I have a LabWindows/CVI application (executable) that must launch a second executable via the "LaunchExecutableEx" library function. When the second executable terminates, it must return an integer value to the first executable. Other than the horrid solution of using a disk file, how can this be done?
Maybe by using a shared DLL?
Thanks.

Please refer to the post on the LabWindows/CVI forum here
Al B.
Staff Software Engineer - TestStand
CTA/CLD

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Introducing LabWindows/CVI 2009

National Instruments released LabWindows/CVI 2009 on Friday, December 4th.
LabWindows/CVI 2009 includes enhanced productivity tools and introduces a new toolkit for run-time analysis and optimization. LabWindows/CVI 2009 also includes support for new technologies such as the Microsoft Windows 7 operating system, 64-bit application development and deployment, and provides a new interface for communicating with NI PXI FPGA-based hardware including FlexRIO and R Series data acquisition modules.
Visit the What's New page to see a full list of the new features in LabWindows/CVI 2009 that will help users create more reliable applications in a shorter amount of time and take advantage of new PC technologies. You can also view the What's New webcast series to get a closer look at the new features in LabWindows/CVI 2009. Some of the new features include:
The new Execution Profiler Toolkit, an application performance measurement and analysis tool
Improved debugging capabilities capabilities with extended information in the variables and watch windows
Easier user interface development with the attribute browser
Integrated support for 64-bit application development and deployment
The C- Interface to LabVIEW FPGA, a communication interface for FPGA-based hardware
Support for Windows 7, the latest Microsoft operating system
Additional Technical Resources Just for LabWindows/CVI Developers
Subscribe to the LabWindows/CVI Quarterly quarterly newsletter to receive the latest product news, tips and tricks, and developer resources. You can also join the LabWindows/CVI user community and start collaborating with users.
Adri Kruger
LabWindows/CVI Product Manager
Message Edited by Adri K. on 12-07-2009 03:28 PM
Adri Kruger
National Instruments
LabVIEW Product Marketing

Turbo,
There isn't a document that covers all the features from 6.0 to 2009, though there are documents that talk about individual upgrades.
http://www.ni.com/lwcvi/whats_new.htm
Also this document covers the upgrades since 8.0 http://zone.ni.com/devzone/cda/tut/p/id/7995
There have been quite a few upgrades, you can always download an evaluation version and test it out for yourself http://www.ni.com/lwcvi/try.htm
Richard S -- National Instruments --Applications Engineer -- Data Acquisition with TestStand

Does LabWindows/CVI: IVI Instrument Driver Development Course contain subject like Communicating with Instruments(SCPI commands)

HI, I am having query regarding; Does LabWindows/CVI: IVI Instrument Driver Development Course contain subject like Communicating with Instruments(SCPI commands)
LabVIEW: LabVIEW Instrument Control Course Day 1 coves subject like Communicating with Instruments This lesson describes how you can use LabVIEW tocommunicate with instruments. You will learn how touse NI-VISA, NI Spy, SCPI commands, and theInstrument I/O Assistant to perform instrument I/O. My question is to you,Does LabWindows/CVI: IVI Instrument Driver Development Course covers similar kind of training like Communication with Instruments? I am more interested in learning How to use SCPI commands to perform instrument I/O. Will you please guide me? So I can choose correct training course. Thanks & Regards,Jay +91 90110 62790EXFO Electro Optical Engineering India Pvt. Ltd.701, 7th floor The Ceribrum IT Park,Kalyani nagar. Wadgaown Sheri India, Maharashtra, Pune 411014

stick to the original thread.

Using Labwindows CVI Version 10.0.1 USB communication with FTDI FT2232D to unit under test.

Communication with unit under test works fine in hypterminal after I downloaded virtual driver from FTDI site.
Never done any USB communication before in LabWindows CVI. What functions can I use in labwindows CVI?

Since the device presents itself as a COM port (pretty standard with the FTDI chips) you should be able to use the RS-232 library in CVI. OpenComConfig() will open a connection to the device, ComWrt() will write data to it, and the various ComRd() functions can be used to read the responses back.

Any LabWindows/CVI examples for SPI communication using DAQmx?

I have a PXIe-6363 module in a PXI running as a real time target, and I'm trying to talk to an accelerometer that communicates with SPI. I know the 6363 isn't one of the special modules built for SPI, but my understanding is it should be capable; the issue is just the programming. I've seen examples of this for LabVIEW using DAQmx. Are there any examples out there for doing it in LabWindows/CVI?
I'm looking to save time and avoid reinventing the wheel here. SPI is easy on an Arduino, so it should be doable in LabWindows/CVI, right?
Thanks,
Matt

Hey Matt,
I was unable to find any full examples of SPI communication with DAQmx in C. My best suggestion would be to use the LabVIEW examples and implement the same series of function calls to implement the LabVIEW code in C. The DAQmx C API is good about keeping a standard with naming conventions to map with the function names in LabVIEW.

Software Development Engineer positions at Hysitron, Inc. in Minneapolis (LabWindows CVI exp preferred)

Software Development Engineer
Hysitron, Inc. is a premier scientific instrument manufacturer. Founded in 1992 with headquarters located in Eden Prairie, MN we are committed to promoting nanotechnology by developing advanced transducer and control technology. This leadership has made Hysitron the world leader in nanomechanical test instruments. The TriboIndenter®, TriboScope®, Ubi, and other Hysitron innovations have opened new horizons for scientists interested in investigating and understanding mechanical properties of materials at nano-scale. Hysitron fosters an environment and culture where innovation flourishes, teamwork is encouraged, and superior performance is rewarded.
Hysitron invites applications for multiple software development engineer positions from those aspiring to explore and succeed in the nano world. Hysitron, Inc. is an Equal Opportunity Employer M/F/D/V
Job responsibilities
The software development engineers would be responsible for developing test and measurement software applications for nano-mechanical testing instrumentation. Job deliverables would include:
-          Develop software applications in C based Labwindows CVI for Hysitron Instrumentation
-          Support the development of applications to address challenges in instrument automation and control
-          Test software applications using debugging and simulation tools
-          Perform software releases and software quality assurance activities
-          Participate in the design of new software products
-          Perform maintenance activities for existing products
-          Adapt and deliver on quality software development practices
Minimum qualifications
-          BS in Computer Science/ Computer Engineering/ Equivalent Scientific or engineering discipline
-          Min of 3 yrs experience in Instrumentation software development in an industrial or R&D environment
-          Expert at programming language C, knowledge of C++
-          Working knowledge of various communication protocols, e.g. USB, RS232, IEEE, RS485, TCP/IP, Modbus
-          Knowledge of general software design/documentation processes in test and measurement systems
-          Proficient problem solving skills
-          Strong analytical and technical skills
-          Excellent communication and interpersonal skills
Preferred Qualifications
-          Proficient with LabWindows CVI and XML
-          Working experience with DSP(Code Composer Studio) and/or FPGA level programming
-          Exposure to digital electronics and instrumentation
-          Working experience in Robotics interface programming
-          Experience with Controls/Automation engineering
Application and Information
Qualified candidates should send a letter of application and their resumes to (please include ‘SW Engineer’ in subject line):
Hysitron, Inc.
10025 Valley View Rd
Eden Prairie, MN 55344 USA
Phone: (952) 835-6366
Fax: (952) 835-6166
E-MAIL: [email protected]
Web: www.hysitron.com

This position is still accepting resumes/CVs.

Interopérabilité entre labview et labwindows/CVI

Bonjour,
j'utilise labview 7.0 dans lequel je souhaite utiliser une DLL compilée avec LabWindows/CVI. Cette DLL contient une fonction de communication avec un équipement distant de type get_value.
Donc, grâce à cette DLL, l'outils labview demande une valeur à l'équipement distant. La fonction CVI envoie la requête à l'équipement distant et attend la réponse de celui-ci avant de retourner la réponse sous labview.
Donc l'exécution de la fonction CVI est assez longue mais entre l'envoie de la requête et la réception de la réponse, le processeur n'est pas utilisé. Néanmoins, durant l'exécution de la fonction, le rafraichissement de la fenetre labivew n'est plus opérationnel et de manière général, l'application labview sem
ble gelée.
Est-il possible de libérer le process pour labview au sein de la DLL sans en sortir ?
J'ai essayé les fonction delay, process draw event et process system event mais rien ne semble libérer le process.
Y a-t-il une solution?
Merci

Hello,
La bonne vieille recherche d'exemples (Help-> Find Examples) reste toujours efficace. Je vous suggère d'aller faire un tour dans la partie MultiThreading. On y trouve toutes les principales fonctions pour créer des threads et y exécuter du code (en parallèle, donc !).
Cet article est aussi un bon départ.
Cdt,
Eric M. - Application Engineering Specialist
Certified LabVIEW Architect
Certified LabWindows™/CVI Developer

How to discard or release mutex in labwindow CVI.

Hi,
How to release mutex in labwindow CVI.
I have one existing DLL . This DLL using method 'CreateMutex(NULL, TRUE, "USBDriverRunning");' .
We need to create another dll , this DLL be release Mutex 'USBDriverRunning'.
Thanks
Mukesh Kumar

CreateMutex returns an handle that is to be passed to ReleaseMutex for releasing the resource. After that you must call CloseHandle on the same handle to clean up everytging.
I don't know whether the handle of a mutex created with NULL in the first parameter can be passed to another DLL; I have never tried to do something similar but be careful with the following note int he function help:
If this parameter is NULL, the handle cannot be inherited by child processes.
You will need to carefully read the Remarks section of the function help and make your own tests.
Proud to use LW/CVI from 3.1 on.
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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.
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How to get bar graph in word in labwindow/CVI ?

how to get bar graph in word in labwindow/CVI ?

ashwinic9,
spawning your question over more and more threads (the present one, this one and this other one) won't give you a faster answer; instead, it will irritate forum users!
Especially if you have at your disposal a fast way to perform a test. I pointed you some days ago to word report example, that writes a table to a word document: did you tried changing the graph into a bar graph and generating the report? I have done it for you and the result is OK, as you can see in the attached document.
Now, since the example works well, there must be something in your particular situation that prevents the graph to be shown; that is: you must add some more data on your actual problem and maybe a small example that exposes the problem.
But please: keep active only this discussion and let the other threads die!
Proud to use LW/CVI from 3.1 on.
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Attachments:
wordreport.doc ‏38 KB

How to edit the list box items in labwindow/CVI?

how to edit the list box items in labwindow/CVI?

Listbox items cannot be edited directly in the control: what you can do is to select a line an, transfer its content to a textbox control, edit text there and move text back to the listbox control. Available interactions with the listbox control are listed in the help.
An alternative to it is to use a tree customized to appear like a listbox: tree item labels can be edited directly in the control, at least those in the base column of the tree. You can look at the example \samples\userint\treelist.cws that shows how a tree can be customized this way. I haven't opened it, but this old example too should show the ability to edit tree cells.
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How to Change Brightness, Contrast and Saturation of an image in LabWindows/CVI (Urgent) ?

Hi All
I want to change brightness, contrast and saturation of an image, plz help me how it will possibe in labwindows/cvi
Thanks

CVI does not include native functions to operate such changements on an image.
It may be possible that these functions are included in IMAQ library, but I never used ot so I'm not sure. In any case, this is an additional tool to install and it is not free.
Alternatively, you may need to search for a third party library that offers such functions.
Proud to use LW/CVI from 3.1 on.
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Status Bar in LabWindows/CVI

         Hello,
         I'm new in LabWindows/CVI. Is it possible to compose a status bar, like in C#, in LabWindows/CVI? Moreover, how can I place the buttons, that I composed before, onto the tabs or decoration tools?
         Good days...

If you are intending a ribbon at the panel footer where to show informations and optionally add buttons, at present CVI does not have such a control.
It has a toolbar control, instead, so if you can reverse your design so that a toolbar can be used, you can find the control into <cvidir>\toolslib\custctrl\toolbar.fp
There is also a demo project that you can look at: you can find it with the example finder (Help >> Find examples... menu function).
Proud to use LW/CVI from 3.1 on.
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Announcement: LabWindows/CVI 2010 SP1 Run-Time Engine Updated

A new version of the LabWindows/CVI 2010 SP1 Run-Time Engine (10.0.1.434) is now available for download. The new version includes Security Update 5Q5FJ4QW which resolves security vulnerabilities in components installed with LabWindows/CVI 2010 SP1 and earlier and LabVIEW 2011 and earlier. Further details can be found at KnowledgeBase Article 5Q5FJ4QW: How Does National Instruments Security Update 5Q5FJ4QW Affect Me? Installing the security update will have the same effect as installing the new version of the Run-Time Engine.
The update can be downloaded from the Drivers and Updates page. The LabWindows/CVIRun-Time Engine is a free download.
National Instruments
Product Support Engineer

The correct link should be this one
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How to Rotation 3D Image in LabWindows/CVI

Hi All
I have a 3D image and i want to rotate its x,y and z axis, how it is possible kindly help me.
Regards
Umer

Hello Umer
When you say that you want to rotate the 3D graph, you mean programmatically? as you can rotate the 3D object using your mouse once the code is running.
To locate the examples in LabWindows/CVI that incorporate the 3D ActiveX Graph control, follow the steps below:
Launch LabWindows/CVI.
Browse to Help » Find Examples » Communicating with External Applications » ActiveX » General.
3. Select any of 3D projects which include
3DGraph.prj, 3DGraphAxis.prj, 3DGraphColorMap.prj, and 3DGraphContours.prj.RegardsMart G

LabWindows/CVI Process Communications

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