Example LabWindows/CVI code for NI4351

Hi,
I'm using an NI4351 PCI DAQ card with the Ni435x
driver and LabWindows/CVI v5.5 (on Windows 98) to measure temperature
and voltage levels. Are there any simple tested code examples that I
could download, which use the NI435x driver function
NI435X_Check_and_Read(), called from an asynchronous timer for
continous scan? There are no problems when I use MAX (so hardware
problem is ruled out), but my code yields
occasional random temperature reading errors (looks like data
corruption to me). The NI435x_ functions return no errors. Can I use
lower level C driver functions instead of NI435X_Check(), NI435X_Read(), or NI435X_Check_and_Read()?
What does MAX use behind the scene? Of course, the MAX setup only scans
the one channel, so maybe this is why it works correctly. I have to
scan one temperature channel and six voltage channels though.
Many thanks,
John.

Humphreyy,
thanks for the tip. I tried it but it did not work, the same errors were present. Are there any other suggestions. I have racked my brain to figure out why this is happening and have come up with nothing. I am also getting a "Warning" message concerning the "KsMedia.h" file that says "Warning: Excess characters in multibyte character literal ignored." The warnings trace back to the "typedef enum" section of that file. Could that be causing a ripple effect that produces the error I am seeing in the other header files I mentioned??
I could really use your help and any more help that is available. I really don't want to use Visual C++, because this software is going to get more sophisticated and is to be used in NASA Langley's VISTAS simulator, an environment taylor made for National Instruments software.

Similar Messages

Book: LabWindows/CVI Programming for Beginners

Has anyone read the followong book LabWindows/CVI Programming for Beginners LabWby Shahid F. Khalid ?
This book in not in print anymore and inpossible to find.
Does anyone know of any similar source material?
I have both LabWindows/CVI Basics I&II but the content is extremely limited and not enogh details.
Does NI offer anything better than the embedded Help?
A Programmers Reference would be nice.
Thanks.

Hello NI Nubie,
I have that book, and also its "advanced" sequel by the same author. They both went out of print a long time ago. The books are OK, but they are only available on the secondary market for ridiculous prices now, and that is assuming that you can even find them.
If I could pass on some advice that might be more helpful to you in learning CVI: pretend those books do not exist for now.  Instead, I think that for learning CVI, there is nothing better than looking at other people's CVI project-level code and really understanding it, inside and out, and then making your own modifications to it to enforce what you just learned from it. There are several places to start looking for project-level CVI code, which I will list in (what I think) are the highest-to-lowest priority of your training.
The first place I recommend is the examples that ship with CVI (located in the "samples" directory under the CVI installation directory). I say this because these are supported by the NI developers and support crew. In fact, back in 1995 when I was learning CVI 3.1, I dove into the "Icon Editor" application, for several reasons: it was a *complete* application (as opposed to the other, mostly point-solution "academic" examples under the samples directory), it showed how to segment your code into multiple source and header files, and it showed many advanced user interface features (menus, cut-and-paste). There is now an "example finder" to help locate examples that "fit" to what you are currently trying to accomplish.  I also use the freeware "grep-like" tool called "Agent Ransack" (URL is below) to hunt down specific CVI functions and identifiers (such as certain EVENTS and how these examples use them).
Agent Ransack on MythicSoft.com
The second place I recommend is the other "support" locations on the NI web site. There are knowledgebase articles, tutorials, submitted examples, community examples, and also extra "academic" examples from NI engineers that aren't the same as the ones that ship with CVI. There are also whitepapers scattered in there as well, and a few that have hidden sample code that is embedded at the bottom of the article. You really have to hunt for this stuff, and it would be great if the NI folks could try to index this a bit better somehow. I sometimes even resort to using Google's search engine to find them on the NI web site, because the NI search engine may not find them.
The third place I recommend are user-based web sites created by power-users of CVI who like to share their code. Two that I found long ago that remain at the top of the list (in my opinion). One is Guillaume Dargaud's site, where he has lots of CVI examples and freeware.  The other is Philippe Baucour's "Rebel" CVI site (but you will need to use an online translator if you don't speak French, though).
Guillaume Dargaud's web site (drill down for CVI examples and freeware)
Philippe Baucour's "Rebel" CVI web site
Finally, you might find it interesting to know that there is a tremendous repository of C source code scattered all around the Internet, mostly as part of free and open-source software projects, many of which are supported on sites such as SourceForge.net, and many other locations. Many of these places are filled with people (in forums or mailing list servers) who live in the C programming world on a full-time basis, and can help you through some of the advanced techniques. Some of these projects might be targeted to Windows, some use cross-platform techniques, so they have a chance of being applied to your CVI efforts. There is also an entire universe of programming "libraries" and capabilities that you can use to augment your CVI projects as well. All of this because of the open-source revolution, riding on the back of GNU/Linux and the community and corporate entities that are backing it all. Examples that come to mind are Cygwin and MinGW. If you only have the time to just look up these two items on Wikipedia, you will see that this is just the tip of the iceberg of the possibilities that are available to you as a C and CVI programmer on Windows.
I hope this was helpful to you.
JB
To whom it may concern: My alias is also my nickname, I've had it since I was a (very) skinny basketball-playing teen. OK, so I've got a 38 inch waist now, but my hometown friends haven't shaken that appellation for me. I trust that you will someday be OK with that alias, as I have been with that nickname.

Using Windows API in my LabWindows CVI code

Hi all.
I would like any and all help. I am developing on LabWINDOWS 2010 and am trying to use the Windows API, particularly the multimedia APIs, in my CVI code. What I am trying to do is audio development, only it has to be in .NET or Visual C++ platform. I have developed the code and UIR, but when I build the solution it tanks on me. Of course when I use MS Visual C++ 2008 or 2010 there are no errors and I could use MS Visual C++ to develop my application, but the development of the user interface and the controls is much more straight forward with CVI and there are more controls to work with than there are with MS Visual C++. Most of the errors that I get are related to the following header files: "MMSystem.h", "devicetopology.h", and the "endpointvolume.h". When I try and build a skelton project with no controls or indicators on the .UIR I get the errors like:
"devicetopology.h"(2301,20) Missing parameter type.
"devicetopology.h"(2301,40) syntax error; found '*' expecting ')'.
"MMSystem.h"(151,1) Unrecognized declaration.
"MMSystem.h"(850,96) syntax error; found 'identifier' expecting ')'.
That is just a few of them, but they typically say the same thing. I have included the header files and libraries in my project, and have made sure that they are in the CVI "sdk" directory. I have tried example code that have these header files and the result is still the same. I know that I should not have these type of issue, at least I don't think I should. Like I said I could use as much help as possible of figuring out what is the matter. Did I install the CVI improperly? Are there patches that I need to actually use windows APIs? I am attaching to this post my code and the code I downloaded from a LabWINDOWS forum. When I ran the code from the forum I got the same errors.
Thanks in advance.
Attachments:
AudioVolume.c ‏2 KB
VISTAS-OpenAL.c ‏44 KB

Humphreyy,
thanks for the tip. I tried it but it did not work, the same errors were present. Are there any other suggestions. I have racked my brain to figure out why this is happening and have come up with nothing. I am also getting a "Warning" message concerning the "KsMedia.h" file that says "Warning: Excess characters in multibyte character literal ignored." The warnings trace back to the "typedef enum" section of that file. Could that be causing a ripple effect that produces the error I am seeing in the other header files I mentioned??
I could really use your help and any more help that is available. I really don't want to use Visual C++, because this software is going to get more sophisticated and is to be used in NASA Langley's VISTAS simulator, an environment taylor made for National Instruments software.

Error: LabWindow CVI driver for Lab View 2011 (using hp4145a)

What is the DLL for the Agilent hp4145a instrument driver?
I am trying to convert the LabWindows/CVI Agilent hp4145 intrument driver for use in labview 2011, but keep getting errors related to an incorrect DLL.

Hi Courtney L.,
Your prompt response is much appreciated. Thank you.
I have attached the "hp4145 LabVIEW Wrapper Conversion Report" as a txt file
- this report was automatically downloaded along with the"LabVIEW Instrument Driver Import Wizard (LabVIEW Interface Generator for LabWindows/CVI Instrument Drivers)" *(link listed below), and popped up at the end of the installation.
If any specific details or a screenshot will also be of benefit to solving this problem, I will be able to post them by tomorrow night.
*Link for Instrument Driver setup download:
https://lumen.ni.com/nicif/us/infolvinstdriver/content.xhtml
Attachments:
LabVIEW_Wrapper_Conversion_Report.txt ‏6 KB

I am getting the message error when trying to run the labwindowa/CVI adapters for debug

See attachments for error message and teststand settings. I am running testand 4.0.1
It was working before and suddenly it crash and then I am getting that error message every time
Regards
Attachments:
ErrorLoadCallback.jpg ‏32 KB
ErrorLoadCallback2.jpg ‏134 KB

It seems that something might still be corrupted or not registered properly. Have you tried running the TestStand Version Selector to re-select your current version of TestStand as the active version?
Also, you mentioned that it crashed and now things aren't working. What exactly occurred when it crashed? Was this just TestStand freezing, or did the entire system freeze or crash? Did you see an error message of any kind?
If the version selector doesn't help things, I would suggest a reinstall of TestStand (and possibly CVI, but let's start with TestStand). To clarify, we want to do an uninstall/reinstall rather than a repair, because the repair will only replace missing files. If a file is corrupted, the uninstall/reinstall should replace it.
Let us know how it goes!
Daniel E.
TestStand Product Support Engineer
National Instruments

VXI-MIO-64E-1 in LabWindows/CVI

I am using VXI-MIO-64E-1 module for Data Acquisition of differential Signal of 0-10V. By default Module is configured in -5V to +5V. I have used status = AI_Configure (deviceNumber, chan, inputMode, inputRange, polarity, driveAIS) function for configure module to 0-10V unipoler but still module is taking -5V to +5V not 0-10V. here is LabWindows/CVI code for configuration of analog input module.
    buffer = (short *)malloc ( NUMPOINTS * sizeof(short));
   status = Init_DA_Brds (1, &brd);
   if ( status != 0 )
    MessagePopup("Error","Error in initializing VXI device");
    exit(-1);
   status = SCAN_Setup (1, NUMMODULES, ChannelList, ChannelGain);
   if ( status != 0 )
    MessagePopup("Error","Error in configuring VXI device");
    exit(-1);
   status = DAQ_DB_Config (1, 1);
   status = DAQ_Config (1, 1, 0);
   status = Select_Signal (1, ND_PFI_7, ND_IN_SCAN_IN_PROG, ND_LOW_TO_HIGH);
   if ( status != 0 )
    MessagePopup("Error","Error in Configuring SCAN_START input Line");
    exit(-1);
   InitializeTimer1();
   /* Module 1 Initialization Over */
   /* Module 2 Initialization Starts */
   buffer1 = (short *)malloc ( NUMPOINTS1 * sizeof(short));
   status = Init_DA_Brds (2, &brd);
   if ( status != 0 )
    MessagePopup("Error","Error in initializing VXI device");
    exit(-1);
   status = SCAN_Setup (2, NUMMODULES1, ChannelList, ChannelGain);
   if ( status != 0 )
    MessagePopup("Error","Error in configuring VXI device 2");
    exit(-1);
   status = DAQ_DB_Config (2, 1);
   status = DAQ_Config (2, 1, 0);
   status = AI_Configure (2, -1, 0, 10, 1, 0);
   /* Module 2 Initialization Over */
What mistake i am doing to configure module-2 to 0-10 Volt input range.

Hello Vishnu,
Unfortunately, the VXI-DAQ cards are no longer supported, but you can find information about using them in the manual. The VXI-MIO Series User Manual has details about setting the input range in Chapter 3 on page 3-4.
Good luck with your application!
Meghan
Applications Engineer

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

Add Transparency Attribute for LabWindows/CVI Panels

Add an attribute for LabWindows/CVI panels for setting transparency.
Currently, in order to achieve this behaviour users are forced to workaround this using Windows API.
Having an attribute for this purpose would allow users to benefit from this functionality more easily and would make LabWindows/CVI programs more cleaner.
Related forum discussion: http://forums.ni.com/t5/LabWindows-CVI/Transparent-Main-Panel/m-p/3172386

Greetings LabWindows/CVI enthusiasts,
I am pleased to inform you that the LabWindows/CVI Real-Time Module Beta Program is now open.
If you are interested in participating in the program, we encourage you to request participation by visiting www.ni.com/beta and choosing to register for the LabWindows/CVI Real-Time beta from the drop-down menu. All previous beta users must re-register for the LabWindows/CVI Real-Time Beta to ensure we have up-to-date information. This is a separate beat program from the LabWindows/CVI Beta and must be registered for separately.
National Instruments
Product Support Engineer

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.

Calling a thread from a cvi code file to another code file

Hello,
I want to call a thread from a labwindows/cvi code file to another labwindows/cvi code file. Namely, my thread function (GraphLoop) is in 'TestsModel.c' ; but I will call the thread in 'Tests.c' . My code in 'Tests.c' is in the following;
int CVICALLBACK GraphLoop (void *functionData);
int GraphLoopId;
int callbackDataGraphLoop;
int CVICALLBACK CBBasla (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
switch (event)
case EVENT_COMMIT:
CmtInstallThreadPoolCallback (poolHandle, EVENT_TP_THREAD_BEGIN, GraphLoop, callbackDataGraphLoop, GraphLoopId);
if (tiklandiE3631ACihazinaBaglan == 0 && tiklandi34401ACihazinaBaglan == 0) // 'E3631A Cihazına Bağlan' ve '34401A Cihazına Bağlan' tuşlarına basılmamışsa uyarı verir.
MessagePopup ("Uyarı", "Lütfen cihaz bağlantısını kontrol ediniz.");
else
if (tiklandiKaydet == 0)
MessagePopup ("Uyarı", "Lütfen ayarları kaydediniz.");
else
SetCtrlAttribute (Testler, PnlTestler_BASLA, ATTR_DIMMED, 1); // 'Başla' tuşunu pasif hale getirir.
SetCtrlAttribute (Testler, PnlTestler_BASLA, ATTR_DISABLE_PANEL_THEME, 1); // 'Başla' tuşunun etiketini pasif hale getirir.
SetCtrlAttribute (Testler, PnlTestler_BITIR, ATTR_DIMMED, 0); // 'Bitir' tuşunu aktif hale getirir.
SetCtrlAttribute (Testler, PnlTestler_BITIR, ATTR_DISABLE_PANEL_THEME, 0); // 'Bitir' tuşunun etiketini aktif hale getirir.
CmtNewThreadPool (DEFAULT_THREAD_POOL_HANDLE, &poolHandle); //Yeni bir thread oluşturur.
CmtScheduleThreadPoolFunction (poolHandle, GraphLoop, NULL, &GraphLoopId); // GrapLoop thread fonksiyonunu başlatır.
break;
case EVENT_RIGHT_CLICK:
break;
return 0;
I take that errror after executing this code;
error:Undefined symbol '_GraphLoop' referenced in "f:\Tests.obj"
Please, can you help me for my question?
Regards...

Hello Eren,
I assume this is a link error.
Do you have TestsModel.c file included in your project?
Constantin.

Manual or Tutorial of LabWindows/CVI?

Hi everybdy, i'd like to know, if anybody knows some manual, tutorial or
how getting started , in the program LabWindows/CVI 5 or other version, in
Internet . Thanks for your attention,and sorry for my English.

"laxus1" wrote:
>Hi everybdy, i'd like to know, if anybody knows some manual, tutorial or>how
getting started , in the program LabWindows/CVI 5 or other version, in>Internet
. Thanks for your attention,and sorry for my English.>>
Hi
The book is ""LabWindows/CVI Programming for Beginners""
Have a look on the following web site.
Type LabWindows on book search.
http://www.phptr.com/
Also try Amazon.com at
http://www.amazon.com/exec/obidos/ASIN/0130165123/o/qid=975622255/sr=8-1/ref=aps_sr_b_1_3/107-7675244-9336531
You can also try EBAY if you like to bid on book.
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=510511275
Hope that help.
Rejean Lafortune
CAE Electronics Ltd.
Avionics Interface Engineering

I'm looking for examples of CAN control code with LabWindows CVI

I'm looking for examples of CAN control code with LabWindows CVI.

Hi,
The NI-CAN driver installs some examples for both the frame API and Channel API (NI-CAN 2.0).
The typical installation directory is:
C:\Program Files\National Instruments\MeasurementStudio\CVI\samples\nican.
It might change depending on where you installed CVI.
DiegoF

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.

Compiling examples closes LabWindows/CVI

I have a NI USB-5132 module, with NI-SCOPE 3.7. I can bring up the device in "Measurement and Automation Explorer", and sees it as "Dev1". I can bring up NI-Scope Soft Front Panel, and toggle the device, read whatever I want to read. However, I'm trying to run on my CVI/LabWindows 2009 platform, but when I try to compile ANY of the examples, the development software closes. No error message....nothing. When I try to create a new DAQmx task, it sees no available devices for ANY of the possible measurements.
Please help! Otherwise, it would seem my work has purchased a very expensive method to click the exit button.

Hi Chris,
I'm sorry to hear that you are having so much trouble! Could you please provide some more details regarding when you experience this crash? Does this crash occur when you compile all programs or just specific ones? What examples are you attempting to compile? If this is the first time that you are compiling and are experiencing this issue, please refer to the following known bugs in CVI 2009
LabWindows™/CVI™ 2009 and 2009 SP1 Known Issues
LabWindows/CVI may crash if compiling a project that includes LabWindows/CVI header files with a line containing the #pragma soft_reference statement
Compiling a file with a syntax error can cause LabWindows/CVI to crash.
If these known bugs are not relevant to your code, can you please post a WinDbg log. The following explains how to do this. Despite this article being applied to LabVIEW, this is relevant for CVI as well.
Using WinDbg for LabVIEW Error Reporting
If you are running an operating system previous to Windows 7, please refer to the following:
Description of the Dr. Watson for Windows (Drwtsn32.exe) Tool
I look forward to your response. Have a great day!
Regards,
Jackie
DAQ Product Marketing Engineer
National Instruments

Q: Must one use special LabVIEW types (e.g. float64) for DLLs in LabWINDOWS/CVI?

Hello,
I have recently started compiling C code using LabWindows/CVI, and have successfully called a simple DLL function from within LabVIEW.
I have a question about the types defined in LabVIEW's extcode.h file:
These are defined to explicitly quantify the number of bits used for each data type (e.g. float64 instead of float) in order to eliminate ambiguity across compilers.
When I am using LabWindows/CVI to compile, do I need to use the LabView numeric types defined in LabView's extcode.h, or can I use the standard C types (int, float, etc.)?
Is there a distinction between having to use these special types for CIN versus shared library calls in LabVIEW?
Thanks
in advance,
Frenk

You do not have to use the defines in extcode.h, but you certainly can if you want to.
The float64 is equivalent to CVI's "double", and the float32 is equivalent to CVI's "float".
These correspond to the double- and single-precision types in the IEEE Standard for Floating Point Arithmetic, IEEE-754.
I hope this helps.
Brian

Example LabWindows/CVI code for NI4351

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