Simple "OpenFile" in CVI

Anyone Everyone, I could sure use some help. My CVI code won't do a simple. I have used the "FileSelectPopup" function to obtain the "pathName" that it out puts and am using that in the "OpenFile"
function to open the file. This is all being take care of in a callback function after a button is pushed. Can someone explain to me why this simple act is not resulting in the display of the selected file? I
could really use the help and it would be greatly appreciated. Code snipet is provided below. The "puts()" I/O function is used just to prove to myself that I have what I need to open this file. Any help on
this simple, yet frustrating endevour, would be great.
int CVICALLBACK OpenFilesUp (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
char UserSelect[MAX_PATHNAME_LEN];//This variable is the buffer for the path of
//the file the user has selected.
//It holds the max value allowed for a path.
int FileHandle = -1;
switch (event)
case EVENT_COMMIT:
//The function below opens a file select box for the user to chose from a from a specific directory, type of default file, other leagal files,
//title of the dialog box, etc.
FileSelectPopup("c:\\Users\\vhouston\\Desktop\\2011 Projects", "*.docx", "*.docx, *.doc, *.txt, *.dat", "File Selection", VAL_SELECT_BUTTON, 0, 0, 1, 1, UserSelect);
//The "OpenFile" function uses the buffer information gathered from the "FileSelectPopup" to open the
//user selected file. Currently this is set for read only, and opens with the pointer at the beginning of the file.
FileHandle = OpenFile(UserSelect, VAL_READ_ONLY, VAL_OPEN_AS_IS, VAL_ASCII);
puts(UserSelect);
break;
case EVENT_RIGHT_CLICK:
break;
return 0;

Hello, sorry for this late response: I was out of office these days.
CVI has the ability to interface with any ActiveX-capable application and comes with some examples to interface with MS Office applications: you should be able to find this example on your PC too. Additionally, there is the word report instrument, which even if aimed to generating reports through Word application should permit to read an existing word document (I'm not sure as I'm not using it actually).
Both instruments are interface to an existing application, i.e. Word must actually be installed on the target systm for these functions to operate. Be warned that Office Starter application is not suitable for this purpose as it lacks the ActiveX facility.
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Simple openFile script

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CVI localtime to get the Day of the Year

I have a vendor supplied driver that needs the day of the year (0-365), minutes, hours, seconds for their board so that it updates itself to the correct time. I am looking at the LabWindows/CVI functions time and localtime to get this information. Those calls are documented in ...\CVI2010\include\ansi\time.h with the code contained within C:\windows\system32\cvirte.dll
when I set up the module within TestStand, I get a message that states:
This function either does not have parameter information in the DLL or user types not recognized by TestStand.
Not a problem. I used the information within time.h to setup the parameters for the function time. That function works fine. The function localtime returns a structure with the individual time elements. I created a Custom Data Type to define the structure. I cannot seem to determine how to define the module for this action so that it will work.
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Attachments:
Test.seq ‏5 KB
time.h ‏4 KB
cvirte.llb ‏5686 KB

Hey Bill,
I think what might be causing issues is that you are calling directly into the CVI Run-Time Engine, which we do not publish an API for and generally do not intend to be called directly from another application. I would recommend creating a simple DLL in CVI to call the functions you want, such as localtime(). This will allow you to use the CVI function panels and other Help resources to correctly configure your function call. You can simply create a wrapper function which calls localtime and returns the value you are interested in. If you build this wrapper code into a DLL, you should be able to call it from TestStand.
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Daniel E.
TestStand Product Support Engineer
National Instruments

CVI IDE: Is it possible to see list of functions for faster navigation?

Colleagues,
Very simple question about CVI IDE.
Is it possible to see whole list of functions for fast and convenient navigation, like in Micro$oft Visual Studio:
When I have C code with more than 20-30 functions and 2000+ lines - its a very inconvenient to scroll up and down every time...
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How you working with relative large projects in CVI?
Thank you in advance,
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CVI offers the Source Code Browser, which shows informations about files, functions, variables, data types and macros in your code. The code browser can be accessed in several ways: the easiest is to position over an element in the code and press Ctrl+F1: the lower part of the workbench will host the Source Code Browser area (though you can lately release this window to position it wherever you find it useful). There are several other ways to access these informations: I suggest you to look in the online help, topic Using LabWindows/CVI >> Writing Source Code >> Browsing Source Code
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Select a panel, menu or control callback and press Ctrl+Shift+U to go to the object in the UIR editor
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Select a filename and press Ctrl+U to open it in an editor window
... and others I don't remember now!
Message Edited by Roberto Bozzolo on 05-07-2010 10:12 AM
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

TCP client server sample

All,
This may not really be a LabWindows/CVI question but I'm really stuck on what should be easy to
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I can successfuly get the Computer 2 client connected to and talking to the Computer 1 server. (using the muRata supplied code)
I can also run the LabWindows/CVI sample code from (\CVI2009\samples\tcp), server on computer 1 & client on computer 2 and they talk with no problems.
(I'm using the same IP addresses and port numbers in all cases)
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Run the CVI server program on computer 1.
I cannot get the muRata client program to connect to the CVI server.
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Some ideas on how to get this working.
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For those that have read this far, thanks much and any ideas or comments will be appreciated,
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Humphrey,
First,
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The reason I entered the wrong port was because the hard-coded port number in the muRata demo code was displayed in hex as 0x9069. ( I converted this to decimal and entered it into the CVI sample server code) The correct port number was 0x6990. (upper and lower bytes swapped) Arrgh!
I found the problem by using the netstat command line utility to display the connections and noted that the port being used was not 0x9069. It is really a problem with the muRata eval kit demo code.
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The server end is simple and the CVI sample is adequate and is now working.
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Kirk

Cannot load .lsb file of CIN

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Hello,
I have found some informations on the NI website.
General Informations.
External Code for LabVIEW - CIN / DLL - Starting Point
http://digital.ni.com/public.nsf/websearch/A6705FEC7EA42300862567B70054206E?OpenDocument
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Bidirectional coms with barcode scanner

Hey everyone. I'm trying to think big thoughts today.
I have implemented a CVI 2012 app that used a Symbol / Motorola LI4278 barcode scanner. Works well. For that application, I went next-to-simplest method by pre-formatting the scanners into CDC driver mode to work with Win7 as virtual com ports. Pretty simple then in CVI with a custom serial callback.
So onto my "big idea" question. It would be great to send warning beeps and LED blinks back to the user weilding the scanner. Mot has an SDK that I've stared at, but it appears to be C++ only. I'm not about to get in there and attempt a wrapper for it.
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Hi ElectroLund,
For the forum thread you linked in your previous post, he said the scanner in question came with a DLL. Since it seems your device did not come with a DLL and only a C++ library, it seems options are pretty limited. You could use a third party C++ development environment and create a DLL out of the C++ source code. This DLL could then be called within your C code.
Unfortunately, since this is regarding communication with a third party device, National Instruments does not support the actual communication with the device. We can assist with calling DLLs and supported drivers. I would suggest contacting the maker of the barcode scanner to see if they have any DLLs or C source code to be used with their devices.
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In past versions of CVI, using OpenFile with no path meant to look in the local path (in other words the install directory). Is there a way to do this in CVI 2013?

I use an .ini file to allow the users to change the bootup preferneces for the program. In the past that file lived in the install directory and OpenFile could cheerfully find the file and apply the preferences. In CVI 2013, the program seems to need an implicit path to the file. Is there a way around this?
Solved!
Go to Solution.

I'm not using CVI2013 yet, but in any case you can build up a full pathname for a file in the application folder using GetProjectDir and MakePathname commands at runtime.
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

Send UI meassages from teststand sequence to Simple CVI Operator Interface with Asynchronous Timer

Hello,
Is it possible and how is it possible to send UI meassages from a teststand sequence to the Simple CVI Operator Interface with Asynchronous Timer which could be downloaded from NI Hompage. I use this problems because it is more stable than the standard OIs
regards samuel

This post could help:
http://forums.ni.com/ni/board/message?board.id=330&message.id=7567
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Very simple CVI-program and question

Hi
I have just started working with CVI and, as far as I can see, the principle behind the interaction between various elemements is similar as in Delphi. I have made a very simple example (User Interface Application), containing a square command button and a numeric. My idea was to push the button, whereafter the NUMERIC-control displays some number. However, I can't seem to figure out how to construct change the function that is executed when pushing the button. I tried double-clicking, right-clicking, etc.., but I couldn't figure it out. I hope my question makes sense.
Solved!
Go to Solution.
Attachments:
untitled.JPG ‏11 KB

I searched for litterature, but only found the Programmer Reference Manual (http://www.ni.com/pdf/manuals/323643a.pdf). The litterature you suggest seems very relevant, I'll take a look at it. Thanks.

CVI Simple UI modifications

I am modifying the CVI Simple user interface (TestStand 4.1.1) and would like to have similar functionality using the SequenceCombo Box and SequenceView Box as the Full Featured User Interface has with the Sequence List Box and the SequenceView (STEPLISTVIEW) box. So that when I select a Sequence in the ComboBox the steps are shown in the SequenceView Box.
Thanks
john
Solved!
Go to Solution.

John -
In the Simple UI, the SequenceView Control is connected to the ExecutionView Manager via the ExecutionViewMgr.ConnectExecutionView() method. When connected in this manner, the SequenceView displays the sequence execution specified by the ExecutionViewMgr.Execution property (when tracing is enabled).
What you want is to have the SequenceView Control display the sequence, and its steps, at edit time. In order for a SequenceView Control to accomplish this, it must be connected to a SequenceFileView Manager via the SequenceFileViewMgr.ConnectSequenceView() method. When connected in this manner, the SequenceView displays, at edit time, the sequence specified by the SequenceFileViewMgr.Sequence property.
A SequenceView Control can only be connected to one Manager control at a time and the Simple UI contains one SequenceView Control.
You can either change the section of the code that connects the SequenceView Control to the ExecutionViewMgr and replace it with the appropriate code to connect it to the SequenceFileViewMgr, or you can add an additional SequenceView Control (in a new tab or tiled next to the original one) and connect it to the SequenceFileViewMgr in the manner described above. The implementation is up to you.
Hope this helps.
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National Instruments

Error transact.cpp when load LabWindows CVI DLL

Hie,
I'm a "newbie" about LabView, and I would like to call a simple LabWindows CVI DLL from LabView. Then for this
I did also a very simple VI (I think : 2 buttons, the first to call my DLL function and the second to quit
my VI). I define my DLL as indicated by NI, all seems OK. After placing and defining parameters about my
DLL function in the diagram, If I "double clic" on the DLL icon in my diagrram, I obtain :
"Failure Transact.cpp, line 1132 ...blabla...blabla".
Another Time, I obtained a message (when I try to run) about
"not enough memory"
the solution is then to kill LabView Process or shunt Down !!!!!
I've tried my "mini" projet on tow systems and I obtained the same results :
Wind
ows 2000 and Windows NT
LabView 6.0 et Lab Windows CVI 6.0
144 Ram and 256 Ram in the two PC and not another application running during my test :
I think then I should have enough ram to do this !
I did not see my problem
thank a lot in advance for any help
file attachement contain hardcopy of VI
Thierry
Attachments:
Bug_Memory_LabView.doc ‏56 KB

Hie,
Now It's OK !!
After submitting my problem to NI, NI has transmitted to me a simple program :
a VI which simply calls a function in a DLL (which loads an UIR), and their solution runs.
Their solution is the "same" as mine except in mine, I have added calls to "MessagePopup"
just to study how running my program like this (see "// Here ->x" ) :
Extract of my code in my DLL :
int __stdcall DllMain (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
int iValue=0;
switch (fdwReason)
case DLL_PROCESS_ATTACH:
"// Here ->1" MessagePopup ("Avertissement", "DLL -> Init Ressources DLL LabWindows");
if (InitCVIRTE (hinstDLL, 0, 0) == 0)
return 0; /* out of memory */
break;
case DLL_PROCESS_DETACH:
"// Here ->2" MessagePopup ("Avertissement", "DLL -> Free Ressources DLL LabWindows");
if (!CVIRTEHasBeenDetached())
CloseCVIRTE ();
break;
The problem is located to the line "// Here ->"
When I drag the icon "Call Librairie function" in the diagram of my VI and I define parameters,
immediately a "link" is established between LabView and the DLL, the __stdcall DllMain is called !
then LabView Environnement failed !, you have then to kill the LabView Process !
By changing the "MessagePopup" functions with tracks (*) in a file, I can "debug" my program and I will
have never this artefacts.
change line // Here ->1 with TraceMsg("DLL -> Init Ressources DLL LabWindows");
change line // Here ->2 with TraceMsg("DLL -> Free Ressources DLL LabWindows");
void TraceMsg(char *szBuffer)
int iValue=0;
int iHandle=0;
iHandle = OpenFile("D:\\Thierry\\Formation LabView-LabWindows\\trace.log",
VAL_WRITE_ONLY, VAL_APPEND, VAL_ASCII);
iValue = WriteLine (iHandle, szBuffer,strlen(szBuffer));
iValue =CloseFile (iHandle);
Thierry

How can I create an application in MSVC 6.0 to access my FieldPoint modules with CVI 5.0 libraries?

I have an application in CVI 5.0 that works. I am trying to export that so I can develop in MSVC. I need none of the UI provided in CVI, all I need are the simple FieldPoint commands provided in FieldPoint.obj. I have been stumped on this for weeks. I would write my own OPC client but the interface isn't even documented on what commands I would send if I did have an interface. I would prefer just to use the CVI libraries in MSVC 6.0. When I call the FP_Open function the program crashes with an RtlSizeHeap error.
Thanks,
Chad

In theory, creating a dll that encapsulates the FieldPoint functions should work in MSVC. However, National Instruments has not tested MSVC interface, nor have we publicized that this type of setup will work, therefore making support unavailable. The other reason for why we do not offer support of FieldPoint in MSVC is that we have not seen a demand for such an interface. Therefore, I recommend that you create an OPC Client that communicates with the FieldPoint OPC Server. One example of such an OPC Client in MSVC is to use Datasockets, found in ComponentWorks++. You can find this example at the following web site:
http://zone.ni.com/devzone/devzoneweb.nsf/opendoc?openagent&8FEAB5F73CFB68278625683A000B06ED&cat=7CDA3E51FEFC4AA2862568B80071A1E2
If you are using the
serial network module (FP-1000/1001), you can communicate with the FieldPoint modules using the Optomux protocol. For a complete listing of the Optomux commands refer to the FP-1000/1001 Programer Reference Manual located at the following web site:
http://digital.ni.com/manuals.nsf/caba5d53e9b015a186256793004eebb7/bf97516ca18eee728625665e0063594e?OpenDocument
Best Regards,
JohnM

Error 1 is to open file vi:. Openfile occurred - Fehler 1 ist bei Open File .vi:Open File aufgetreten

Hi there,
I'm using Labview 7.1 and Windows 7.
I built a VI and it ran perfectly yesterday. Today when I tried to run it, the following message appeared:
Fehler 1 ist bei Open File+.vipen File aufgetreten
Mögliche Gründe:
LabVIEW: Ein Ausgabeparameter ist ungültig.
NI-488: Befehl erfordert, daß der GPIB-Regler der aktive Regler ist.
Translation (google translator):
Error 1 is to open file vi:. Openfile occurred
Possible reasons for this:
LabVIEW: An input parameter is invalid.
NI 488: command requires that the GPIB controller is the active controller.
In the attachment I am sending the file. The file is very simple. I'm just importing some data from excel.
Regards
Solved!
Go to Solution.
Attachments:
Error.jpg ‏49 KB

Cottbus wrote:
I have the VI in a loop, because I want to make operations with a specific cell from Excel in each iteration. First loop, use the first cell, second loop the second one and so on. Maybe there is another way to do that, but that is how I figured it ou. If you have any suggestions to make it simpler I appreciate.
First of all, you don't have an "excel" file, which is a proprietary format. You have a delimited plain text table with semicolons separating columns and linefeeds separating rows.
You have only one loop. You are probably talking about first iteration, second iteration etc.
Your loop spins so fast that you will only see the last row after the VI has completed. Use a small wait.
All you need is the following code (looks slightly different, because it is LabVIEW 2010). This will display all rows in sequence for however many rows you have. If you only want to display the first 5 rows, you can wire a 5 constant to the N of the FOR loop.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ReadRows.png ‏3 KB

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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Simple "OpenFile" in CVI

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