How to use LabVIEW in a multiple coder environment?

The subject basically says it all. This thought hit me the other day, now that we will be two persons (and eventually perhaps more) coding on a source code written only by me so far. In my job, we commit and update source code to a SVN repository by using TortoiseSVN. This works very well with C/C++, since the source code files are in plain text and will be merged by TortoiseSVN. But since VI files are binary, I gather that this will not be possible. I tried comparing two different revisions of my own commited code, and this didn't work. How is this particular problem solved in other multideveloper environments?

Source code control merging and all of that stuff is secondary to the design itself. I have had a half-dozen developers working on the same project but different "sand boxes" and yes we managed to get 6 person months worth of work done in a month.
Integration of tested components is when things get touchy but if done in a orderly manner, no suprises there either.
Rules that have helped us;
1) Use Tree.VI (or Root.vi , Catalog.vi) to hold all of the top level VIs. This will ensure we find out about possible integration issues when they happen.
2) Never save broken code to SCC. It is all too easy to start ignoring a broken tree.
3) Communicate with your team! let them know where you are going next.
4) Assume your team mebers will mis-use your code and build in error checking to let them know what they did wrong.
5) Never save a VI unless you can explain why you are saving it.
Backup-up often.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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Could anyone tell me how to use protected method in jsp code ...
I declare a Calendar class , and I want to use the isTimeSet method ,
But if I write the code as follows ..
========================================================
<%
Calendar create_date = Calendar.getInstance();
if (create_date.isTimeSet) System.out.println("true");
%>
============================================================
when I run this jsp , it appears the error wirtten "isTimeSet has protected access in java.util.Calendar"

The only way to access a protected variable is to subclass.
MyCalendar extends Calendar
but I doubt you need to do this. If you only want to tell if a Calendar object has a time associated with it, try using
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I need to program a Hittite Fractional-N Synthesizer Evaluation Kit with a HMC702LP6CE an external YIG oscillator. Not sure how to use Labview to control the PLL.

I need to program a Hittite Fractional-N Synthesizer Evaluation Kit with a HMC702LP6CE an external YIG oscillator. Not sure how to use Labview to control the PLL.

Here is how to use the PLL. But I don't know of how to interact with that device
http://zone.ni.com/devzone/cda/tut/p/id/3781
And for thouse who don't know what a PLL is a free bonus link is here:
http://digital.ni.com/public.nsf/allkb/07BC8D77D4E9AE258625708B007CE74F?OpenDocument
and a second one on what that device is: http://www.hittite.com/products/view.html/view/HMC702LP6CE
Now we are all caught up to speed.
Sam S
Applications Engineer
National Instruments

How to use labview with the handyboard

Hi,
how to use labview with the handyboard
Thx...

I'm assuming you're talking about this, since you didn't provide a link for those of us who don't know what you're talking about.
As the other poster said, you didn't say how you want to use LabVIEW with it. If you want to write LabVIEW programs than run on the microprocessor, then you're out of luck. If you want LabVIEW to interact with it, then you've got a couple of options, SPI probably being the best, but it also has DI and AI that you could use to communicate with it - the DI's could be used as a parallel interface.
Message Edited by Matthew Kelton on 12-17-2007 02:21 PM

How to use labview with gpib to connect with Agilent PNA E8362B ?i am newbie ..just started to work on labview about a fortnite bck and a novice in interfacing skill ..so plzzzzz explain me in a litle detail

how to use labview with gpib to connect with Agilent PNA E8362B ?i am newbie ..just started to work on labview about a fortnite bck and +i am a novice in interfacing(networking... jst know tidbits) skill ..so plzzzzz explain me in a litle detail

Sir
We were able to solve that problem...but now could you advice as to which DC power supply we should use (preferably avalable in India) so that it can be controlled by Labview (through a gpib/rs232/any other port) to give a square wave of desired frequency/other parameters.
Regards
Shivam

How to use labview with gpib to connect with Agilent PNA E8362B ?

how to use labview with gpib to connect with Agilent PNA E8362B ?i am newbie ..just started to work on labview about a fortnite bck and +i am a novice in interfacing(networking... jst know tidbits) skill ..so plzzzzz explain me in a litle detail

Duplicate Post.

How to use parrallel cursor in this code

hi can anyone expalin me how to use parallel cursor for this code ...
loop at itabkpf.
      read table ibsegpar_fu with key
                 belnr = itabkpf-belnr
                 gjahr = itabkpf-gjahr
                 bschl = '25' .
Start insert by Pradeep 20082008
      sort: itabkpf by belnr,
            itabsegpar by belnr.
End insert by Pradeep 20082008
      if sy-subrc = 0. "Deleted by pradeep 20082008
        select bukrs belnr gjahr bschl koart lifnr wrbtr
               wskto pswbt zfbdt augbl augdt sgtxt rebzg rebzj
               into corresponding
               fields of table ibsegpar_fu_1 from bseg
               where bukrs = itabkpf-bukrs and
               belnr = itabkpf-belnr and
               gjahr = itabkpf-gjahr and
               augbl <> itabkpf-belnr and
               rebzg <> space and
               bschl = '25'.
        loop at ibsegpar_fu_1.
Start insert by Pradeep 20082008
          sort ibsegpar_fu_1 by belnr.
End insert by Pradeep 20082008
          move-corresponding ibsegpar_fu_1 to itabseg.
          move ibsegpar_fu_1-belnr to itabseg-augbl.
          move ibsegpar_fu_1-rebzg to itabseg-belnr.
          move ibsegpar_fu_1-rebzj to itabseg-gjahr.
*********to include code to pick the description for partical payment
          select single * from bseg where
              bukrs = ibsegpar_fu_1-bukrs and
              belnr = ibsegpar_fu_1-belnr and
              gjahr = ibsegpar_fu_1-gjahr and
              augbl <> ibsegpar_fu_1-belnr and
              rebzg = space and
              bschl <> '25'.
          move bseg-sgtxt to itabseg-sgtxt.
          clear bseg.
*********end of code
          itabseg-wrbtr = itabseg-wrbtr * -1.
          itabseg-pswbt = itabseg-pswbt * -1.
          select single budat into lsdat from
               bkpf where bukrs = ibsegpar_fu_1-bukrs and
               belnr = ibsegpar_fu_1-rebzg and
               gjahr = ibsegpar_fu_1-rebzj.
          if sy-subrc = 0.
            move lsdat to itabseg-zfbdt.
          endif.
          append itabseg.
        endloop.
      endif. "Deleted by Pradeep 20082008
    endloop.
    loop at ibsegpar_fu.
      sort ibsegpar_fu by belnr. " insert by pradeep
      move-corresponding ibsegpar_fu to itabseg.
      select bukrs belnr gjahr bschl koart lifnr wrbtr
             rebzg rebzj sgtxt into corresponding
             fields of table ibsegpar_fu_1 from bseg
             where bukrs = ibsegpar_fu-bukrs and
             gjahr = ibsegpar_fu-gjahr and
             augbl = ibsegpar_fu-belnr and " Pradeep 20082008 Delete
            augbl <> ibsegpar_fu-belnr and " Pradeep 20082008 Insert
             rebzg = space and
             bschl = '25'.
      if sy-subrc = 0.
        loop at ibsegpar_fu_1.
          move ibsegpar_fu_1-rebzg to itabseg-rebzg.
          move ibsegpar_fu_1-rebzj to itabseg-rebzj.
        endloop.
        move ibsegpar_fu-belnr to itabseg-augbl.
        move itabseg-rebzg to itabseg-belnr.
        move itabseg-rebzj to itabseg-gjahr.
        itabseg-wrbtr = itabseg-wrbtr * -1.
        itabseg-pswbt = itabseg-pswbt * -1.
        select single budat into lsdat from
             bkpf where bukrs = ibsegpar_fu-bukrs and
             belnr = itabseg-rebzj and
             gjahr = itabseg-rebzj.
        if sy-subrc = 0.
          move lsdat to itabseg-zfbdt.
        endif.
        append itabseg.
        read table itabseg with key
             belnr = itabseg-rebzg
             gjahr = itabseg-rebzj
             bschl = '31' .
        if sy-subrc = 0.
         delete itabseg index sy-tabix. "Deleted by Pradeep 20082108
        endif.
      endif.
    endloop.
Start insert by Pradeep 20082008
     loop at itabseg.
      if itabseg-belnr = itabseg-augbl.
        delete itabseg.
      elseif itabseg-belnr = ' '.
        delete itabseg.
      endif.
    endloop.
End insert by Pradeep 20082008

hi can anyone expalin me how to use parallel cursor for this code ...
loop at itabkpf.
      read table ibsegpar_fu with key
                 belnr = itabkpf-belnr
                 gjahr = itabkpf-gjahr
                 bschl = '25' .
Start insert by Pradeep 20082008
      sort: itabkpf by belnr,
            itabsegpar by belnr.
End insert by Pradeep 20082008
      if sy-subrc = 0. "Deleted by pradeep 20082008
        select bukrs belnr gjahr bschl koart lifnr wrbtr
               wskto pswbt zfbdt augbl augdt sgtxt rebzg rebzj
               into corresponding
               fields of table ibsegpar_fu_1 from bseg
               where bukrs = itabkpf-bukrs and
               belnr = itabkpf-belnr and
               gjahr = itabkpf-gjahr and
               augbl <> itabkpf-belnr and
               rebzg <> space and
               bschl = '25'.
        loop at ibsegpar_fu_1.
Start insert by Pradeep 20082008
          sort ibsegpar_fu_1 by belnr.
End insert by Pradeep 20082008
          move-corresponding ibsegpar_fu_1 to itabseg.
          move ibsegpar_fu_1-belnr to itabseg-augbl.
          move ibsegpar_fu_1-rebzg to itabseg-belnr.
          move ibsegpar_fu_1-rebzj to itabseg-gjahr.
*********to include code to pick the description for partical payment
          select single * from bseg where
              bukrs = ibsegpar_fu_1-bukrs and
              belnr = ibsegpar_fu_1-belnr and
              gjahr = ibsegpar_fu_1-gjahr and
              augbl <> ibsegpar_fu_1-belnr and
              rebzg = space and
              bschl <> '25'.
          move bseg-sgtxt to itabseg-sgtxt.
          clear bseg.
*********end of code
          itabseg-wrbtr = itabseg-wrbtr * -1.
          itabseg-pswbt = itabseg-pswbt * -1.
          select single budat into lsdat from
               bkpf where bukrs = ibsegpar_fu_1-bukrs and
               belnr = ibsegpar_fu_1-rebzg and
               gjahr = ibsegpar_fu_1-rebzj.
          if sy-subrc = 0.
            move lsdat to itabseg-zfbdt.
          endif.
          append itabseg.
        endloop.
      endif. "Deleted by Pradeep 20082008
    endloop.
    loop at ibsegpar_fu.
      sort ibsegpar_fu by belnr. " insert by pradeep
      move-corresponding ibsegpar_fu to itabseg.
      select bukrs belnr gjahr bschl koart lifnr wrbtr
             rebzg rebzj sgtxt into corresponding
             fields of table ibsegpar_fu_1 from bseg
             where bukrs = ibsegpar_fu-bukrs and
             gjahr = ibsegpar_fu-gjahr and
             augbl = ibsegpar_fu-belnr and " Pradeep 20082008 Delete
            augbl <> ibsegpar_fu-belnr and " Pradeep 20082008 Insert
             rebzg = space and
             bschl = '25'.
      if sy-subrc = 0.
        loop at ibsegpar_fu_1.
          move ibsegpar_fu_1-rebzg to itabseg-rebzg.
          move ibsegpar_fu_1-rebzj to itabseg-rebzj.
        endloop.
        move ibsegpar_fu-belnr to itabseg-augbl.
        move itabseg-rebzg to itabseg-belnr.
        move itabseg-rebzj to itabseg-gjahr.
        itabseg-wrbtr = itabseg-wrbtr * -1.
        itabseg-pswbt = itabseg-pswbt * -1.
        select single budat into lsdat from
             bkpf where bukrs = ibsegpar_fu-bukrs and
             belnr = itabseg-rebzj and
             gjahr = itabseg-rebzj.
        if sy-subrc = 0.
          move lsdat to itabseg-zfbdt.
        endif.
        append itabseg.
        read table itabseg with key
             belnr = itabseg-rebzg
             gjahr = itabseg-rebzj
             bschl = '31' .
        if sy-subrc = 0.
         delete itabseg index sy-tabix. "Deleted by Pradeep 20082108
        endif.
      endif.
    endloop.
Start insert by Pradeep 20082008
     loop at itabseg.
      if itabseg-belnr = itabseg-augbl.
        delete itabseg.
      elseif itabseg-belnr = ' '.
        delete itabseg.
      endif.
    endloop.
End insert by Pradeep 20082008

How to Use LABVIEW charts with Mathscript

Hi,
   I recently tried to work on Mathscript and it is really amazing. what I tried to figure out is:
    Instead of plotting using traditional "plot" statement, how to use LabVIEW chart ( I know how to Add output but the graph were not as expected
Is there any mean to get rid of this "Lengthy" delay that "ALL MATLAB User know" for first time compilation?
Thanks in advance
Waleed El-Badry MSc.,MCPD, ISTQB Certified Tester
Assistant Lecturer
Mechatronics Department
Faculty of Engineering
Misr University for Science & Technology

Well Chris,
         I was about to post the solution, but as I said, I'm in a middle of experts
It took me 3 hours to figure it out. I should've checked your answer . I resolved to the same suggesstion of yours. I only added some functionality to get the newbies like me being acquainting with how easy to work with LABVIEW mathscript based on MATLAB knowledge.
Waleed El-Badry MSc.,MCPD, ISTQB Certified Tester
Assistant Lecturer
Mechatronics Department
Faculty of Engineering
Misr University for Science & Technology
Attachments:
Play with Mathscript.vi ‏35 KB

How to use LabView to control Primera Bravo II CD burner?

I am trying to use LabView to control the Primera Bravo II CD burner and label printer. The software that controls the Bravo II is PTPublisher. How to use LabView to communicate/control the PTPublisher? Please help, Thanks

Hi Qian,
I installed PTPublisher on a virtual machine, and I was wondering what kind of tasks you wanted to control within LabVIEW. From the program GUI, it appears like the only way to access functions is via mouse clicks. Do you know of any other way to control the Bravo II CD burner besides the PTPublisher software? If not, does the PTPublisher allow you to control it in some way other than clicking?
Peter K.
National Instruments

How to use LABVIEW to collect wireless network camera (with video server) video.

How to use LABVIEW to collect wireless network camera (with video server) video.I would like to use LABVIEW for a wireless network camera (IP Camera comes with the video server module)the client program.Will the ability to achieve?If feasible, how to do, there are examples, thank you.

I believe NI Vision is what you are looking for.

How to use the 'Decision between multiple alternatives' Process variant

Hi ,
Can anyone tell me how to use the 'Decision between multiple alternatives' Process variant in BI 7 Process chains ?
The requuirement is that I have a DSO eg DSO 1 from which i have to load DSO 2 and DSO 3 . Now if the number of Records in DSO 1 are < 100 i will load DSO 2 from DSO 1 else i will load DSO 3 from DSO 1 .
So in the PC i have used a 'ABAP Program' variant (which counts the number of rows in DSO 1) after loading DSO 1 and after this 'ABAP Program' Variant , i have used the 'Decision between multiple alternatives' Process variant. Problem is it is giving me only some some system fields in the formula , like sy-datum or sy-timlo , which are of no use here .
It would be great if i can receive some help here .
--Devraj

in RSPC you create a ABAP processing type "ending with specific values".
We use true or false for things as you specify.
your abap program should return a true or a false to indicate which of the situations is applicable.
Is this helpful?
Marco

How to use in enums in multiple places?

How does one use an enum set in multiple places in a vi?
I have resorted to just copying an existing one when I need the same set of enum values in a different spot, but doing it this way will be a big hassle if/when I want to add items to the enum, because I would have to locate every copy of the enum and update them idividually.
Is it possible?

It's not so much the "custom control" part as it is the typedef part. A typedef enforces the datatype for all its instances, including constants, so changing it will propogate through your entire code. To create it the easiest way is to create a front panel enum control and then right click it and select Advanced>>Customize. You can then change it into a typedef and save it under any name you want.
From this point on, you can simply use that typedef in your code.
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here, here, here, here and here are a few you can start with and here are some tutorial videos. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
Try to take over the world!

Need Expert's Advice - How to use LabView Efficiently and to increase Readability

My application is fairly complex. It is a real world testing applications that simultaneously controls 16 servo motors running various stress testing routines asynchronously and all at the same time. The application includes queues, state machines, sub VI's, dynamically launched VI's, subpanels, semaphores, XML files, ini files, global variables, shared variables, physical analog and digital interfaces and industrial networking. Just about every technique and trick that LabView 2010 has to offer and the kitchen sink as well.
Still I am not happy with the productivity that LabVIEW 2010 has provided, nor the readability of my final product.
Sometimes there are too many wires. Much of my state machines have a dozen or more wires just going from input to output, doing nothing, just because one or two states in the machine need that variable in some state. Yeah, I could spend alot of time bundling and unbundling and rebundling those values, but I don't think that would improve things much.
We have had a long discussion about the use or misuse of Local variables in this forum and I don't want to repeat that here. I use them sparingly where I think it is relatively safe to do so. I also have a bug whenever I try and copy some code that contains one or more local variables. On Pasting the code with local variables, the result is something other than what I expected, I am not sure what. I have to undo the paste and rebuild the code one object at a time.
I am also having trouble using trouble using Variable Property Nodes. When I cut and paste them, they often loose their reference object and I have to go back into the code and redo the Link To on each one. That wastes alot of time and effort.
Creating subVIs is often not appropriate when the code makes many references to objects on the Front Panel. Some simple code will turn into a bunch of object references and dereferences which also tends to take alot of work to clean up and often does not help overall readability in many cases. I use subVIs when appropriate, but because of the interface overhead, not as often as I would like to. My application already has over 150 sub VIs.
The LabView Clean Up Diagram function often works poorly. It leaves way too much empty space between objects, making my diagrams 3 to 4 24" screens wide. That is way too much and difficult to navigate effectively. The Clean Up function puts objects in strange places relative to other objects used nearby. It does a poor job routing wires and often makes deciphering diagrams more difficult rather than easier.
My troubleshooting strategies don't work well for large diagrams and complex applications. The diagrams are so complex that execution highlighting may take 20 minutes for a single pass. Probes help, but breakpoint aren't of much use, because single stepping afterwards often takes you to somewhere else in the same diagram. I can't follow the logic well doing this.
Using structures, I may have Case structures nested 5 to 10 levels deep inside some Event Structure inside a While Loop. Difficult to work with and not very readable.
All and all, I can make it work, but I am not happy about the end result.
I am hoping to benefit from some expert advice from those that are experienced in producing large complex applications efficiently, debugging efficiently and producing readable diagrams that they are proud of.
Can anyone offer their advice on how best to use the LabView features to achieve these results in complex applications? I hope that you can help show me the light.

I'm not an expert but I'm charged out as one at work.
I am off today so I'll share some thoughts that may help or possibly inspire others to chime. I have tried to continually improve my code in those areas and would greatly welcome others sharing their approaches and insights.
Note:
I do refactoring services to help customers with this situation. What I will write does not represent what we do in a code review since our final delverable is a complete final design and that is beyond the scope of this reply.
I'll comment on your points.
dbaechtel wrote:
My application is fairly complex. ...
While watching Olympic figure skating competion slow-motion replays, I learned how the subtleties of how the launching skate is planted while entering a jump can make the difference between a good jump and a bad one.
In software, we plant our foot when we turn from the design to the development. I have to admit that there where a couple of times when I moved from design to development too early and found myself in a situation like you have described.
How to know when design is done?
Waterfall says "cross every 't' and dot every 'i' " while Agile says "code now worry about design latter" and Bottom-up "says "demo working why bother designing" (Please feel free to coment on these over-simplifications gang).
My answer is not much more helpful for those new to LabVIEW.
My design work is done when my design diagrams are more complicated than the LabVIEW diagrm they describe.
dbaechtel wrote:
simultaneously controls 16 servo motors running various stress testing routines asynchronously and all at the same time. The application includes ...and the kitchen sink as well.
Have you posted any design documents you have? These will help greatly in letting us understand your application. More on diagrams latter.
Anytime I see multiple "variations on a theme", I think LVOOP (LabVIEW OOP ) . I'll spare you the LVOOP sales pitch but will testify that once you get your first class cloned off and running as a sibling (or child) you'll appreciate how nice it is to be able to use LVOOP.
Discalimer:
If you don't already have an OOP frame of mind, the learning curve will be steep.
dbaechtel wrote:
Still I am not happy with the productivity that LabVIEW 2010 has provided, nor the readability of my final product.
Sometimes there are too many wires....going from input to output, doing nothing,... spend alot of time bundling and unbundling and rebundling those values, but I don't think that would improve things much.
Full disclaimer:
I used to be of the same opinion and even used performance arguements to make my point. I have since, changed my mind.
Let me illustrate (hopefully). This link (if it works for you, use lefthand pane to navigate hierachy) shows an app I wrote from about 10 years ago when I was in my early days of routing wires. Even the "Main" VI started to suffer from too many wires as this preview from that links shows.
Clustering related data values using Type Definitions is the first method I would would urge. This makes it easier to find the VIs that use the Type def via the browse relationships>>>callers. If I implement my code correctly, any problem I believe is associated with a particualr piece of data that is a Type def has to be in one of the VIs that use that type def therefore easier to maintain.
When I wrote "related data" I am refering data normalization rules (which my wife knows and I picked-up from her and I claim no expertise in this area) where only values that are used together are grouped. E.G. Cluster named File contains "Path" and "Refnum" but not "PhaseOfMoon". This works out nicely with first creating sub-VI since all of the data related to file operations are right there whe I need it and it leads into the next concept ...
When I look at a value in a shift register on the diagram taking up space that is only used in a small sub-set of states, I concider using an Action Engine . This moves the wire from the current diagram into the Action Engine (AE), and cleans up the diagram. The AE brings with it built-in protection so provided I keep all of the opearations related to the the Type def inside the AE I am protected when I start using multiple threads that need at that data (trust me, it may not make a difference now but end users are clever). So that extra wire is effective encapsualted and abstracted away from the diagram you are looking at.
But I said earlier that I would not sell LVOOP so I'll show you what LVOOP based LV apps look like to contrast what I was doing ten years ago in that earlier link. This is what the top level VI looks like.
And this is the Analysis mode of that app.
I suspose I should not mention that LVOOP has wizards that automatically create the sub-VI (accessors) that bundle/unbundle the clusters, should I?
Continuing...
dbaechtel wrote:
We have had a long discussion about the use or misuse of Local variables...I also have a bug whenever I try and copy some code...
If you can simplify the code and duplicat ethe bug. please do so. We can get it logged and fixed.
dbaechtel wrote:
I am also having trouble using trouble using Variable Property Nodes....
That sounds like a usage issue. Posting code to illustrate the process will et us take a shot at figuring out what is happening.
dbaechtel wrote:
Creating subVIs is often not appropriate... My application already has over 150 sub VIs.
"Back in the day..." LV would not even try to create a sub-VI that involved controls/indicators. I use sub-VIs to maintain a common GUI often but I do it on purpose and when I find myself creating a sub-VI that involves a control/indicator, I hit ctrl-z immediately!
I figure a way around it (AE ?) and then do the sub-VI.
Judging by your brief explanation and assuming you do a LVOOP implementation, I would estimate that app need 750-1500 VIs.
dbaechtel wrote:
The LabView Clean Up Diagram function often works poorly....
THe clean-up works fine for how I use it. After throwing together "scratch code" and debugging the "rats nest" I'll hit clean-up as a first step. It guess good enough on simple digrams and in some cases inspires me to structure the diagram in a different way that I may not have thought about. If I don't like, ctrl-z.
Good deisgn and modualr implementaion led to smaller diagrams that just don't need thrre screens.
dbaechtel wrote:
My troubleshooting strategies don't work well for large diagrams and complex applications....Can anyone offer their advice on how best to use the LabView features to achieve these results in complex applications? I hope that you can help show me the light.
Smaller diagrams single step faster since the sub-VI run full speed. I cringe thinking about a 3-screen diagram with multiple probes open ( shivver!).
Re: Nestested structres
Sub-VIs (wink, wink, nudge, nudge)
If it works you have prven the concept is possible. That is the first step in an application.
I hope that gives you some ideas.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

"HOW to use Labview call Dll compiled by VC++"

"hello,I use VC++ compile a DLL,and i want to call DLL Function in LABVIEW program.But there is a dll function
when i call it in labview.There is error.The prototype of Dll Function that make error is "USHORT DLLFUN __stdcall IBWRT(unsigned short dev_address,const char *pstrWrite)",The second paramenter is a char pointer,
and the paramenter pass a command which content is
"MEASURE:CURRENTC? 1A,0.001MA".
When i use VC++ to call this function,i program followed:
CString m_wrt;
int ReturnW;
m_wrt="MEASURE:CURRENTC? 1A,0.001MA";
char buffer[40];
strcpy(buffer,m_wrt);
ReturnW=IBWRT(4,buffer);
and this call is correct.
But when i use labview to call this function.ther
e is
error.So, who can help me,to tell me how to call this
function.Thanks."

Are you asking about porting code or calling C++ code in LabVIEW? As far as porting code, there's no easy way to move code back and forth between LabVIEW and C++. However, if you are trying to call C++ code in LabVIEW, you can compile it as a DLL and call it in LabVIEW using the Call Library Function node.
Chad B. » National Instruments » ni.com

How to use labview to create a Menu?

Hi I would like to use labview 8.0 to create a Menu interface, anyone can tell me how to do it?
Thanks,
Mike

Click on the Edit>>Run time menu button, and this will open up a menu editor for you.
In your code, you can use an event structure with the "Menu Selection User Event" to handle the menu selection.
Open up the Example Finder in LabVIEW and search for Menu. There are 6 or 7 examples there that will get you started.
S G
Certified LabVIEW Architect, Certified TestStand Developer, Certified Professional Instructor

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