How to use XVID MEPG4 DECODER in labview

May i ask how to use Xvid MEPG4 Decoder to compress the AVI file. For this decoder have been installed in my computer but the VI(IMAQ AVI2 Get Codec Names)can not list this code name. So may i ask how can i use this decoder in the labview. For this decoder is relatively has good quality and also small size. Or what kind of other solution can be provieded for the relative small size of AVI file.
Thanks
Daniel

I believe this was answered already in a different thread: http://forums.ni.com/t5/LabVIEW/LabView-to-grab-and-save-video-to-mpeg/m-p/643864
www.movimed.com - Custom Imaging Solutions

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How to use CASE or DECODE in this?

Hi , I have a query like this
AND ...smthng
AND --smtg
AND age BETWEEN ....For the last AND clause for age column, I have the values passed from IN param of this SP in form of strings
'0-30', '31-60', '61-90', and '91+'. The IN param is of course VARCHAR2.
What I want to do in this AND clause
e.g. for age range '0-30', the AND clause should be
AND age BETWEEN ( if this range is '0-30' then ) 0 AND 30 ( if range is '31-60') then BETWEEN 31 AND 60.. and so on...
However this BETWEEN will work till 61-90 range but for 91+ , there is no upper bound so it should be
AND age>91
Now , i am not sure how to achieve this both BETWEEN and '>' clauses in the same AND statement.
DECODE will not work and am not sure how to use the CASE in this situation as even that can not solve this issue.
Dont want to make the last AND clause dynamic
Please suggest me how to do this.
Thanks,
Aashish
Edited by: Aashish S. on Oct 21, 2011 6:01 PM

A third alternative would be to choose a suitably large value as a high end for the 91+ group and use something like:
age between to_number(CASE WHEN instr(:param, '+') = 0
                              THEN substr(:param, 1, instr(:param, '-') -1)
                              ELSE substr(:param, 1, instr(:param, '+') -1) end) and
            to_number(CASE WHEN instr(:param, '+') = 0
                           THEN substr(:param, instr(:param, '-') +1)
                           ELSE '9999' END)John

How to use a C# dll in Labview?

How can I use a C# dll in Labview 8.2? With the "Import Shared Library" Wizzard I need the header file which I don't have. Is there another way
to use such .dll to import the functions created in C#?
Thanks in advance
Norick

Norick,
afaik there is no tool which provides you the possibility to create something like an instrument driver for .NET assemblies.
Maybe we should take a look into terminology:
- Instrument driver: This is a set of functionality, which provides the user with an easy to use API for a special instrument. Very often, the driver itself is written in C/C++ and provided as a DLL.
- "Import Shared Library" Wizard: This wizard enables the user to create an own API for any C/C++ DLL (or compatible) for LabVIEW. This wizard requires the information on all exported functions; this info is contained in the header file. The result of the wizard is a set of VIs containing one Call Library Function Node each for each exported function.
- .NET assembly (extension .exe OR .dll): This can be compared to ActiveX. So the way to program with .NET is similar to ActiveX. Maybe you want to take a look into the examples of LabVIEW regarding .NET...
- Global Assembly Cache (GAC): All assemblies contained here are registered in the system. Every application can easily work with assemblies contained here.
- Private assemblies: This would be the way to work with .NET assemblies which are built on your own. You have to select the .DLL-file itself and make sure that the file can always be found in the same (relative)folder of your application.
hope this helps,
NorbertMessage Edited by Norbert B on 02-21-2007 02:16 AM
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

How to use a c file in LabVIEW

Hi All,
I have a c file which communicates through serial port and J1850 protocol. I want to use the C file in labview and do the communication through serial port.
Can any one give me an idea how I have to use the c file in LabVIEW.
Thank you.!
---------------- Be Good. Do Good. ---------------------

Have you tried reading the LabVIEW Help or even searching this web site? This question has been asked MANY times. There's a section in the LabVIEW Help called "Calling Code Written in Text-Based Programming Languages." There are also several articles written on this. Here's just one: https://decibel.ni.com/content/docs/DOC-1690
Please do the research and then come back with a more specific question.

How to use a GPIB card's LabView drivers to communicate with the card?

I have an axiomtek AX4810P PCI-GPIB card and i have aquired LabView drivers from the manufacturer.
This has put VI's for the GPIB functions on the 'user palette' but i can't work out how to use them to communicate with the card. can anyone help? please.

LS,
Thank you for contacting National Instruments.
Unfortunately, since you are not using a National Instruments GPIB card, I do not have access to the drivers that were provided to you by your card's manufacturer. I would suggest contacting Axiomtek directly to obtain support using their drivers.
However, I did write a small VI that demonstrates how to use similar National Instruments drivers with a National Instruments GPIB card. Keep in mind, this example VI is not intended to work with your particular card. The drivers you obtained from Axiomtek may have similar functions, however, and you can use my VI as a guide. My VI allows you to send a command to an instrument at address 2 on the GPIB card.
Hope this helps!
Matthew C
Applications
Engineer
National Instruments
Attachments:
GPIB_Communication.vi ‏23 KB

How To Use Exported Function "CallInstrument" of LabView.exe ?

Hello!
I want to use the function "CallInstrument" to dynamically call VIs with LabView. Did anyone has experiences with this function?
All I kow is following:
The function is used by LabView Internals and its Runtime Library. Its exported by LabView.Exe and lvrt.dll.
Its prototype is maybe:
int CallInstrument(CPStr* VIPath, int controlcount, int indicatorcount, int options, [ Variable List of Control/Indicator Parameters ]... );
( CPStr Type is a StringArray of PStr (Short PascalStrings) as it is used by LabView to store Path datatypes. )
I whould be glad, if anyone has information about this function.

Dear Rolf Kalbermatter,
Thirst, thanks a lot for your answer! -
You sure right, It whould be much much more comfortable to use the VI Server.
And you're also right... using a undocumented dll-function is absolutly no longtime solution.
Currently I am using VI Server for my problem, but it doesn't fit my interesst so much.
But I will explain, what I'm trying to do.
I want to call a VI dynamically from LabView, giving Parameters to its Controls and receive Results from its Indicators.
Realy no big job, but VI Server only let you do this that easy if you have a VI Typedef. otherwise... with untyped VIs, its not that simple. Ok.. its not impossible, you can use "GetAllControlValues" and "SetControlValue" (functions from VI server) and the call "RunVi". But this can get slow (>100ms per call :/ )
I'm looking for a alternative function, which let me call a VI dynamically with userdefined Parameters. Maybe you know the ActiveX Interface IVirtualInstrument and its Function "Call2" - it is a nice example, what kind of function i want.
But this function is not directly available by the VI Server--- i don't know for what reason.
Then i tried to make use of "Call2" from within LabView, and it took me some time to find out the right Parametersyntax but finnaly i got it and it worked fine ... but it was no long time until problems occur. I cannot tell what really went wrong, but sometimes labview simply crashed or hang into a loop reseting some VIs. And its also impossible to stop a running vi, with has made a call to "Call2", if the call doesn't return by itself.
Next step is/was trying to take advantage of CallInstrument. So, yesterday... after hours of analysing assemblercode, i finnally found out the correct use of LabView.exe->CallInstrument and i'm very impressed about its speed (0-15ms per call). The prototype seem to be the same as you explained in your reply int CallInstrument(Path path, Bool modal, int32 nInputs, int32 nOutputs, ...)
But It has the same problem as its ActiveX derivat "Call2".. if you call an endless looping VI, LabView cannot stop your caller-vi. The other bad thing is, that this function is using dynamic paramterlist, which are placed directly onto the stack!
That means that the paramter count on the stack is NOT FIXED (printf makes it the same). LabVIews DLL InvokeNode doesn't support this.
At my current position, it looks like i have three possiblities but no one fits into my interesst.
(continued with next answer)

How to use postlv user event in labview

Hi sir
I am sending data labwindow cvi dll call to labview,for that we need postlv user event.please any one knows to use postlv user evenet in labview.
Below will be the structureand i need to update in labview .
typedef struct
unsigned
uDSPIO,
// uDAQMode,
// bControllerActive,
bShutDown,
bPowerOn,
bPowerHi,
bPowerFault,
bSGIdle,
bSGHold,
uBitsIn,
uBitsOut,
uCycleCount,
uCycResidue,
uBlockCount,
uLogChannels,
uCurrentMode,
uAsigndPhysCh[LOG_CHANNELS];
float
fSetPoint,
fDAQRate,
fRange[LOG_CHANNELS],
fReadout[LOG_CHANNELS],
fMax[LOG_CHANNELS],
fMin[LOG_CHANNELS];
char
sChID[LOG_CHANNELS][32],
sChUnits[LOG_CHANNELS][16];
CTRL_CHANNEL_STATUS;
Attachments:
GDSCallback.vi ‏12 KB

AThe fixed size arrays in your structure are inlined byt the C compiler. This means they are not an array pointer (and definitely never a LabVIEW array handle) but rather LOG_CHANNELS amount of unsigned ints and floats directly embedded in the structure. In LabVIEW terms this is most easily represented as a cluster with LOG_CHANNELS elements inside the main cluster.
So basically your uAsigndPhysCh needs to be a cluster with LOG_CHANNELS elements of unsigned ints and fRange, fReadout, fMax and fin are clusters with LOG_CHANNELS single precision float values, and then sChID is a cluster with 32 * LOG_CHANNELS chars and sChUnits one with 16 * LOG_CHANNELS chars.
However I would personally rethink this strategy. This huge cluster monster is passed into PostLVUserEvent() each time and copied into the event data on every event, causing quite a bit of overhead that way. Is it really necessary to post all this data every time?
Also you have commented out uDAQMode and bControllerActive in your C structure but included it in the LabVIEW cluster which will certainly throw off your data. Last but not least the b prefix would probably indicate that you are only using that element as a boolean value, so why not consider to use bit fields there? In LabVIEW you can easily seperate those bitfields by either translating the resulting uInt32 into a boolean array or even more efficiently use boolean logic to detect the bits.
And in order to let LabVIEW react on a user event you have to create that user event with the correct datatype (your cluster monster) and then pass the user event refnum to your DLL. This DLL then calls PostLVUserEvent() with the user event refnum as first parameter and a pointer to a data structure that matches the LabVIEW user event datatype EXACTLY whenever it wants to post an event to LabVIEW. The user event is also registered in an event structure in LabVIEW which will then get triggered everytime your DLL posts an event by correctly calling PostLVUserEvent().
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

How to use count with decode

I want to count several categories(say a b c d) under same count and some catogories under another count ..there I need to use count with decode pls let me know the syntacs to write my query..this is ergent
regards
Buddhike

Something like this ?
select count(decode(your_column,'a',1)) as "a",
       count(decode(your_column,'b',1)) as "b",
       count(decode(your_column,'c',1)) as "c",
       count(decode(your_column,'d',1)) as "d"
from your_table;But maybe you can give us more details about what do you expected ?
Nicolas.

How to use case and decode to extract the data

Hello PL/SQL Gurus,
I am using Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production version
I have a table in following format -
drop table TT2;
create table TT2(College, Class,gender,status,fees) as select
'IITB','MBA','M','P',255600 from dual union all select
'IITK','MTech','M','P',300000 from dual union all select
'IITD','MBA','F','P',450000 from dual union all select
'IITKH','MBA','F','P',350000 from dual union all select
'IITC','MTech','F','P',420000 from dual union all select
'IITB','MTech','M','P',185000 from dual union all select
'IITC','MTech','M','P',235000 from dual union all select
'IITD','MBA','F','F',175000 from dual union all select
'IITM','MBA','M','F',257000 from dual union all select
'IITKH','MTech','F','P',335000 from dual union all select
'IITD','MBA','F','P',540335 from dual union all select
'IITC','MBA','F','F',125089 from dual union all select
'IITD','MTech','M','P',290756 from dual union all select
'IITM','MBA','M','P',200000 from dual union all select
'IITKH','MBA','F','F',534990 from dual union all select
'IITD','MBA','F','P',221000 from dual ;some of the extraction conditions are as following -
CASE CONDITION
College in 'IITB' and status='P'- 'WestRegion Passed'
College in 'IITC' and status='P'- 'SouthRegion Passed'
College in 'IITD' and 'IITK' and status='P' and Gender='F' - 'NothRegion Female Passed'
College not in 'IITK' and status='F' - 'Ex Kanpur Failed'
Expected output -
Region Statnding     Fees
WestRegion Passed     440460
SouthRegion Passed     655000
NothRegion Female Passed     1386335
Ex Kanpur Failed     1092079SQL Used
I am using the following query which only make sure of case but this is not how i want the output , if i try to use the case within decode then how to work on this -
SELECT (CASE WHEN College in ('IITB') and status='P' then sum(fees) else 0 end) WP,
(case when College in ('IITC') and status='P' then sum(fees) else 0 end) SP,
(case when College in ('IITD','IITK') and gender='F' and status='P' then sum(fees) else 0 end) NFP,
(case when College in ('IITK') and status='F' then sum(fees) else 0 end) ExKF
FROM
TT2
GROUP BY College, Class,gender,status

user555994 wrote:
Thank you so much jeneesh i am really thankful to you ...vov.
one more query in case if any of the selection don't have the output data , then values will be displayed like -One way..
with t as
--"Add all your descriptions
(select 'WestRegion Passed' region_standing from dual union all
select 'SouthRegion Passed' region_standing from dual union all
select 'NothRegion Female Passed' region_standing from dual union all
select 'Ex Kanpur Failed' region_standing from dual)
select region_standing,sum(fees) fees
        from (
        (SELECT CASE WHEN College in ('IITB') and status='P'
                            then 'WestRegion Passed'
                    when College in ('IITC') and status='P'
                            then 'SouthRegion Passed'
                    when College in ('IITD','IITK') and gender='F' and status='P'
                            then 'NothRegion Female Passed'
                    when College in ('IITK') and status='F'
                            then 'Ex Kanpur Failed'
                    else 'Others' end region_standing,
                    sum(fees) fees
        FROM TT2
        GROUP BY CASE WHEN College in ('IITB') and status='P'
                            then 'WestRegion Passed'
                    when College in ('IITC') and status='P'
                            then 'SouthRegion Passed'
                    when College in ('IITD','IITK') and gender='F' and status='P'
                            then 'NothRegion Female Passed'
                    when College in ('IITK') and status='F'
                            then 'Ex Kanpur Failed'
                    else 'Others' end
        union all
        select region_standing,0
        from t
group by   region_standing;
REGION_STANDING              FEES
Others                     2567835
NothRegion Female Passed   1211335
WestRegion Passed           440600
Ex Kanpur Failed                 0
SouthRegion Passed          655000
{code}
Edited by: jeneesh on Nov 5, 2012 5:07 PM

How to use matlab compiled DLL in Labview ?

I have LV 8.5, and am unable to use a matlab compiled DLL in my LV code. I have tried the 'import' command, but it does not list any functions. However, it does not show any errors during its execution. The existing solutions/responses to this question do not work either. I would also like to know of a way to deal with mxArray datatype. What is its equivalent in C (or any other high-level language) ? How do I retrieve an array that is returned from the matlab dll ?

I'm assuming you have either Matlab installed or at the very least the Matlab Runtime, otherwise the DLL won't work. The "import" command relies on having a header file. Do you have one? You also need to make sure the DLL has been compiled so that it's compatible with LabVIEW. The most likely problem is name mangling, which also occurs when you try to compile a DLL written in C++. See this post, which contains links to useful posts.
The mxArray datatype is a special datatype which is actually a structure. It's complicated. Your best bet is to create a C DLL that acts as an intermediary between the Matlab DLL and LabVIEW. If you are able to, you can, instead, simply call the Matlab code directly using the Matlab script node.

How to use Expression Edit in the LabVIEW control (teststand category)?

Hi All,
I am developing the teststand specify module using LabVIEW. I found that is Expression Edit control in the Labview Controls pallete. does anyone have any example?
I have enabled the expression browser button but I dont know how to link it to the teststand. Pls advise.
Thanks
- toko -

Hey Toko,
You basically need to refer the button to the sequence context. For a great description of this and an example, please refer to this previous discussion forum:
http://forums.ni.com/ni/board/message?board.id=330&message.id=10609&requireLogin=False
Thanks,
Andy McRorie
NI R&D

How to use GPIB communication check in LabVIEW

There is one power supply in our office from Agilent. How to develop software for that Power supply using LabVIEW we should be able to change the
voltage via GPIB interface.

If you have the GPIB commands for your Agilent device in its product manual and a GPIB card, just go to Block diagram functions-> instrument i/o-> gpib and you have a set of GPIB functions.
Also look at attached VI ( taken from labview examples shipped with labview) to get an idea on how to do GPIB write
Regards
Dev
Attachments:
LabVIEW_GPIB.vi ‏44 KB

How to use a ps3 controller with labview

Hello, I am trying to implement a ps3 controller in labview but am having trouble. I was wondering if anyone knew how to do this or had any ideas for me. Thanks for the help

Hi Keaton
I'm not too sure how the inputs of the controllers work on a lower level, but Sixaxis offers a driver to integrate the ps3 controller onto a pc. It is available at this website:
http://dl.qj.net/playstation-3/tools-and-utilities/sixaxis-driver-for-pc.html
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http://forums.qj.net/
Hope this helps
Luke W

"How to use an Appplicom card with Labview and a Seimens PLC"

Hi, I am using an applicom card type PCI1500-PFB to communicate with a Seimens S7-300 CPU315-2DP plc. I am using this simply to display in a labview front panel the outputs of the plc and may in the future use switches on the front panel to control the inputs of the plc. How do I do the communication? I have setup the applicam card and have comms with the plc I think. I am trying to use data socket to communicate to the plc via the applicom card. Any suggestions?
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Tom

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http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/5913e03f551de3f786256a32005b4586?OpenDocument
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http://www.ni.com/pdf/manuals/323241a.pdf
From there, it all depends on
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http://ni.com/labview/labviewdsc/what_is.htm?node=10418
=====================================================
Fading out. " ... J. Arthur Rank on gong."

How to use a Matlab Program within Labview

Hi
I saw in this forum that many users are using some matlab program
executed in Labview program. I have actually Labview 7.1 and would like
to use some of my matlab program in Labview. Is there an easy way to do
it ?
Thanks
Thomas

The MATLAB Script function is kinda buried in the function palette, and
can be found under Functions >> Analyze >> Mathematics
>> Formula. Unfortunately this feature is not available in
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Andy F.
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How to use XVID MEPG4 DECODER in labview

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