Passing handles from C to LabVIEW

I have a serial handle that has been generated from a C library. I'd like to pass it to labVIEW and convert it to a serial IO data type. How do I do this?

Just use INT32 in Labview to access the serial handle in C library.

Similar Messages

How can I convert a Database Handle from TestStand to LabVIEW?

I want to use a Database Handle (already created in TestStand by an Open Database step) in a LabVIEW-VI (called from TestStand) to connect it with the "Connection Reference" input of the "Easy SQL.vi"? If I use a directly connection via the "TestStand - Get Property Value (Number).vi" I get back the error message 4101 in LabVIEW. How can I convert the Database Handle?
Test Engineering
digades GmbH
www.digades.com

The TestStand database step types use the CVI SQL Toolkit to talk to databases. The handle that you are referencing is an internal memory location and not a actual handle that you can directly use. Currently as implemented the handle that is stored in a numeric TestStand property for the connection and the SQL statement are the handle values returned from the CVI SQL Toolkit. So for the connection handle, you could call the CVI SQL Toolkit function
DBGetConnectionAttribute (
int Connection_Handle,
tDBConnectionAttr Attribute,
void *Value);
and get the CVI CAObjHandle reference. With this you could then call the CVI ActiveX function
CA_GetInterfaceFromObjHandle(
CAObjHandle Object_Handle,
const IID *Interface_Id,
int Force_AddRef,
void *Inte
rface_Ptr,
int *Did_AddRef);
to get the actual ActiveX interface reference. This would have to be converted into a LabVIEW reference.
You may want to consider just using LabVIEW to open a new parallel reference only using the toolkit.
Scott Richardson
National Instruments

What is the best way to open close and pass instrument handles from labview in teststand parallel model?

I have a number of test systems that use a parallel model with labview. We have a good number of instruments(PXI).
What is the prefered method for open,closing and passing instrument handles in teststand using labview?
Solved!
Go to Solution.

Hi,
No, Below is a bit from the Session Manager Help
Currently, Session Manager supports the following instrument session types:
IVI Sessions—Use an IVI session to obtain the C-based instance handle for an IVI logical or virtual instrument name. NI Session Manager does not support IVI-COM drivers at this time. When IVI-COM drivers are available, you can use an IVI session to obtain an ActiveX interface reference to an IVI-COM driver.
VXIplug&play Sessions—Use a VXIplug&play session to obtain a C-based instance handle for a VXIplug&play logical or virtual instrument name. Configure VXIplug&play names in the <VXIplug&play directory>\<Platform directory>\NISessionMgr.ini file.
VISA Sessions—Use a VISA instrument session to obtain a C-based viSession handle to a VISA resource or logical name. Configure VISA logical names in the <VXIplug&play directory>\<Platform directory>\NISessionMgr.ini file.
Custom Sessions—Use a custom session to create a data container object that shares ActiveX objects you create or other data between software components you write. Use the Attach and Get methods to attach data to and retrieve data from a session. A custom session does not initialize, close, or own an instrument handle. The data you share with a custom session does not have to be instrumentation related. You can create a custom session with any name you request.
Regards
Ray Farmer
Regards
Ray Farmer

How to pass data from a Delphi pascal DLL class to a LabView data cluster?

Hi all,
I have the following problem:
I'm using a dll written in Delphi Pascal to transfer data to LabView using the "Call Library Function Node".
My Delphi dll contains this class:
TFlash=class
    Fi:TFileInfo;
    constructor Create;
    procedure LoadFi(Filedir_and_nametring);
end;
TFileInfo=record
    Idx:smallint;
    IdxLstSpl:array[0..4] of longint;
    Ms:word;
    Sp:array[0..4]of word;
end;
I've created the TFileInfo record datastructure into a LabView cluster to have the "same" variable.
My plan was to call a Deplhi DLL function with the "Call Library Function Node" and to pass the address of the TFileInfo record, so the data would be passed to the LabView Cluster.
When I make a simple delphi dll function like this, it works because I only pass an small integer to Labview (without reference to the data structure):
var Data:TFlash;
function GetNrOfRows(FilePath: string):integer;stdcall;
begin
Data:=TFlash.Create;
Data.LoadFi(FilePath); //this function gets the number of rows out of the selected file.
Result := Data.Fi.Idx;
end;
When I try to use this procedure instead of the function above, to pass the address of the whole complex data structure of "Data" (TFileInfo), I'm unable to get the information of "Data" into my Labview cluster:
procedure LoadFileInfo(FilePath: string; DataPointer: Pointer);stdcall;
begin
Data:=TFlash.Create;
Data.LoadFi(FilePath);
DataPointer:=@Data;
end;
Call Library Function Node settings:
- stdcall (WINAPI)
- Run in UI Thread
- Function prototype: void LoadFileInfo(PStr FilePath, void *DataPointer);
      * DataPointer --> Type: 'Adapt to Type' and Data format: 'Pointers to Handles'.
      * FilePath --> Type: 'string', string format: 'pascal string pointer'
I'm struggeling with this problem for almost a week now and I can't really find a solution on the forum or google.
I've also read the following posts:
http://forums.ni.com/ni/board/message?board.id=170&message.id=229930&requireLogin=False
http://forums.ni.com/ni/board/message?board.id=170&message.id=77947&requireLogin=False
http://forums.ni.com/ni/board/message?board.id=170&message.id=51245&requireLogin=False
(or did I miss something in these posts?)
Hope my explanation is clear.
Thx
Solved!
Go to Solution.

Ok, I'm one step further:
Because it works when passing an integer from the dll to Labview,
I tried a simple vi containing a cluster with an small integer (16 bit signed Integer) in it and passing the pointer to that cluster:
same settings:
Call Library Function Node settings:
- stdcall (WINAPI)
- Run in UI Thread
- Function prototype: void LoadFileInfo(PStr FilePath, void *DataPointer);
      * DataPointer --> Type: 'Adapt to Type' and Data format: 'Pointers to Handles'. (and the cluster wired to the output of the Call Library Function Node)
      * FilePath --> Type: 'string', string format: 'pascal string pointer'
Changed the Delphi function to:
procedure LoadFileInfo(FilePath: string; DataPointer: Pinteger);stdcall;
begin
Data:=TFlash.Create;
Data.LoadFi(FilePath); --> this function fills in the data in Data.Fi
DataPointer^:=Data.Fi.Idx; --> write the smallint on the address given by Labview
end;
When I call my DLL this way, the expected value appears in smallint indicator in de cluster on the front panel.
When I'm passing a pointer from the TFileInfo Type:
Delphi:
var Data:TFlash;
type PtrTFileInfo = ^TFileinfo;
procedure LoadFileInfo(FilePath: string; DataPointer: PtrTFileInfo);stdcall;
begin
Data:=TFlash.Create;
Data.LoadFi(Copy(FilePath,2,length(FilePath)-1));
DataPointer^:=Data.Fi;
end;
During debugging in my Delphi environment: when I get out of this function and pass this to Labview, an error occurs: access violation at 0x004E7125: read of address failed 0x00002A24. Process stopped.
Is it actually possible to access data with 2 applications? Delphi--> common stack <--Labview

I'm new to the LabView. How do I pass data from VI configured using Serial (CMTS using CLI commands to set Parameters ) to VI configured using GPIB(vector signal analyzer ) to measure such as RF frequency or power on the instrument? Thanks

I'm new to the LabView. How do I pass data from VI configured using Serial (CMTS using CLI commands to set Parameters ) to VI configured using GPIB(vector signal analyzer ) to measure such as RF frequency or power on the instrument?
I just want to set something on the front panel that will execute the Serial parameters first and then pass these settings to vector signal analyzer
Thanks
Phong

You transfer data with wires.
Frankly, I'm a little confused by your question. I can't think of any reason why you would want to pass serial parameters (i.e. baud rate, parity) to a GPIB instrument. Please explain with further detail and attach the code.

How can I call a LabVIEW executable from within another LabVIEW executable?

I have a customer requirement for two LabVIEW executables. Based on their current setup, they need to run executable "A" or "B", both of which are under independent revision control. I have created a third "selection" executable that allows the operator to choose between one of the two, but I am receiving errors when I attempt to call a LabVIEW executable from within a LabVIEW executable using either the "System exec" VI or the "Run Application" VI. If I call a non-LabVIEW executable (such as Windows Explorer) everything works fine.

> I have a customer requirement for two LabVIEW executables. Based on
> their current setup, they need to run executable "A" or "B", both of
> which are under independent revision control. I have created a third
> "selection" executable that allows the operator to choose between one
> of the two, but I am receiving errors when I attempt to call a LabVIEW
> executable from within a LabVIEW executable using either the "System
> exec" VI or the "Run Application" VI. If I call a non-LabVIEW
> executable (such as Windows Explorer) everything works fine.
As with the other poster, I suspect a path problem. You might try the
path out in a shell window, and if it works, copy the complete absolute
path to LV to see if that works. LV is basically passing the comma
nd to
the OS and doesn't even know what is in it, so you should be able to get
it to work.
The other poster commented on subpanels, which is a good suggestion, but
without going to LV7, an EXE can have open more than one VI. You can
use the VI Server and the Run method to fire up another top-level VI.
The decision is whether you want both to be in unique processes.
Greg McKaskle

Can't pass parameter from HTML form of multipart/form-dta type to JSP

I am using request.getParameter(passed variable name) to pass data from HTML form to JSP with no problem. WHen I try to pass data from HTML form of multipart/form-dta type to JSP as following:
< form enctype="multipart/form-data" name="theForm" method="post" ACTION="http://titan.ssd.loral.com:7778/ifs/jsp-bin/ifs-cts/stringsecond.jsp">
The passed value is null. Why?
How can I pass data successfully from this form to JSP?
How can I pass data from JavaScript to JSP?
Thank you

I am using request.getParameter(passed variable name)
to pass data from HTML form to JSP with no problem.
WHen I try to pass data from HTML form of
multipart/form-dta type to JSP as following:
< form enctype="multipart/form-data" name="theForm"
method="post"
ACTION="http://titan.ssd.loral.com:7778/ifs/jsp-bin/if
-cts/stringsecond.jsp">
The passed value is null. Why?because the jsp most likely does not handling of POST parameters like this.
How can I pass data successfully from this form to
JSP?jsp's are not meant to read such amounts of data. this (= uploading) is a typical task for a specialized servlet. there you have full control over input and output. if you need to, you can still forward to a jsp after processing in the servlet.
How can I pass data from JavaScript to JSP???? i'm not sure what exactly you mean. normally you put it into an url and submit it.
robert

How to pass data from a C++ program to LV to plot the data real time?

Hello,
I am writing a C++ program in which I need to plot the data in real
time. I would like to pass data from my C++ program to LabView in order
to perfrom the plotting. I was wondering if this is possible. If so,
how can it be done? .
Thank You

There are several C++ examples and application notes here.

Passing value from one frame to another?

HI
I am trying to use actionscript to calculate an amount and
pass it from keyframe (1) to another keyframe (15) where the total
is supposed to be carried over and displayed. Any ideas why this
doesn't work?
Also should I be using screens or scenes to make this any
easier? - I am not sure.
thanks
Emma
ON FRAME ONE:
//Calculates total price.
two_btn.onPress = function() {
priceTotal_txt.text = Number (price1_txt.text) + Number
(price2_txt.text) + Number (price3_txt.text) + Number
(price4_txt.text);
var MyTotal:Number = priceTotal_txt.text;
_root.gotoAndStop (15);
ON FRAME 15:
this.onEnterFrame = function (){
var MyTotal:Number = priceTotal_txt.text;}

Number of things wrong here.
1. if you declare var MyTotal within the body of a function
it is considered a local variable and automatically gets deleted
after the function has executed. Meaning, you loose it.
The var needs to be declared on the timeline (and is called a
timeline variable).
var MyTotal:Number=0;
//Calculates total price.
two_btn.onPress = function() {
priceTotal_txt.text = Number (price1_txt.text) + Number
(price2_txt.text) + Number (price3_txt.text) + Number
(price4_txt.text);
MyTotal = priceTotal_txt.text;
_root.gotoAndStop (15);
2. onEnterFrame is a misleading name for the event. You will
probably include a stop() action on frame 15 and then the function
you assign to the event handler gets executed n number of times per
second where n is the framerate of the movie. You don't want that.
on frame 15:
trace(MyTotal); // I'm not sure what you want to do here...
3. Convert a string to a number by using parseInt()
var MyTotal:Number=0;
//Calculates total price.
two_btn.onPress = function() {
priceTotal_txt.text = Number (price1_txt.text) + Number
(price2_txt.text) + Number (price3_txt.text) + Number
(price4_txt.text);
MyTotal = parseInt(priceTotal_txt.text);
_root.gotoAndStop (15);

Passing variables from Applescript to bash

Hello,
I'm trying to pass variables from Applescript to bash using the following code
#!/bin/bash
osascript <<EOF
tell application "SystemUIServer"
set username to text returned of (display dialog "Enter your name" with icon caution default answer "" buttons{"Continue"})
set macname to text returned of (display dialog "Enter name of your Mac" with icon caution default answer "" buttons{"Continue"})
do shell script "export USERNAME=" & quoted form of username & " && export MACNAME=" & quoted form of macname
end tell
EOF
echo "USERNAME is $USERNAME, MACNAME is $MACNAME"
but no luck
Mac-mini:Downloads admin$./new.command
USERNAME is , MACNAME is
Any help would be greatly appreciated.

I just realized you are returning 2 variables. That can still be handled by echoing/printing the values, you just have to parse the output, or use other tricks.
VALUES=( $(osascript -e '...') )
This would make VALUES an array, with each array element containing one space separate return value from osascript
USERNAME=${VALUES[0]}
MACNAME=${VALUES[1]}
If USERNAME or MACNAME could have spaces in them, you would need to use some kind of separator character. For example if you use @ as the separator you could do something like:
VALUES=$(osascript -e '...')
USERNAME=${VALUES%@*}
MACNAME=${VALUES#*@}
which will %@* will delete everything starting with the @ til the end of the string, and #*@ will delete everything from the beginning of the upto and including the @.
Another trick is to have the return values be properly formed shell variable assignments such as
print "USERNAME='your user name' MACNAME='Your Mac Name' " -- I'm making this up as I do not really know Applescript, so you will have to figure out how to get Applescript to print something that looks like
USERNAME='your user name' MACNAME='Your Mac Name'
In your shell script you have code that looks like:
VALUES=$(osascript -e '...')
eval $VALUES
The eval will execute whatever is stored in $VALUES, and if that happens to look exactly like shell variable assignments, you get the variables created in the current shell context, where can use them.

Passing parameters from BSP to BW report

How to pass parameters from a BSP application to BW in order to execute the BW report

In BW template
a different URL is generated for selection made in each input field.
I have 4 different URL's now.
and when I push the Execute button a URL is generated which looks incomplete and it does not show all the parameters( lot of things are happeninng inside like authorizatins, session handling etc).
The URLS are shown below
URL genarated when the query is executed in the browser:
http://coles33.co.lsil.com:1080/SAP/BW/BEX?variable_screen=X&template_id=0QUERY_TEMPLATE&INFOCUBE=ZAMOEMP1&QUERY=ZAIMREP1
After selecting Location:
http://coles33.co.lsil.com:1080/SAP/BW/BEX?SAP-LANGUAGE=E&PAGENO=1&CMD_ID=1&REQUEST_NO=0&VAR_VALUE_EXT_2=CA01&F4CMD=FINISHED
After selecting org:
http://coles33.co.lsil.com:1080/SAP/BW/BEX?SAP-LANGUAGE=E&PAGENO=1&CMD=PROCESS_VARIABLES&INDEX=3&VAR_VALUE_HELP_SET_LINE=3&REQUEST_NO=0&VAR_VALUE_HELP_SET_5=5
After pushing Insert:
http://coles33.co.lsil.com:1080/SAP/BW/BEX?SAP-LANGUAGE=E&PAGENO=1&CMD=PROCESS_VARIABLES&REQUEST_NO=0&CMD=PROCESS_VARIABLES&SUBCMD=VAR_NEW_LINES&VARID=WNTEST1%200001
After making second selection for org:
http://coles33.co.lsil.com:1080/SAP/BW/BEX?SAP-LANGUAGE=E&PAGENO=1&CMD=PROCESS_VARIABLES&INDEX=4&VAR_VALUE_HELP_SET_LINE=4&REQUEST_NO=0&VAR_VALUE_HELP_SET_15=15
After selecting FLSA:
http://coles33.co.lsil.com:1080/SAP/BW/BEX?SAP-LANGUAGE=E&PAGENO=1&CMD_ID=2&REQUEST_NO=0&VAR_VALUE_EXT_5=EX&F4CMD=FINISHED
after selecting date:
NO URL GENERATED
After pushing Execute:
http://coles33.co.lsil.com:1080/SAP/BW/BEX?SAP-LANGUAGE=E&PAGENO=1&CMD=PROCESS_VARIABLES&REQUEST_NO=0&CMD=PROCESS_VARIABLES&SUBCMD=VAR_SUBMIT&VARID=
I am not able to understand how to call this url from BSP page.( I also have multi-selection for location and org)
regards
Aditya

Pass parameter from dynamic navigation iView to WebDynpro iView

Hi All,
I know there are a lot of threads dealing with passing paramters from EP to WebDynpro using EPCM but actually I didn´t find a solution for my problem.
I have in the dynamic navigation area of the SAP Portal an iView based on a JSP dynpage. In the corresponding JSP I fire an EPCM-event:
EPCM.raiseEvent("urn:test.de:wochenb" , "passDataToWebDynpro" , evtData);
In the content area there is a WebDynpro iView. In this WebDynpro-application I subscribe to the event in the wdDoInit-method of a view:
WDPortalEventing.subscribe("urn:test.de:wochenb" , "passDataToWebDynpro" ,wdThis.wdGetDataFromJSPDynpageAction());
and I have an event-handler:
public void onActionDataFromJSPDynpage(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent, java.lang.String dataObject )
    //@@begin onActionDataFromJSPDynpage(ServerEvent)
     IWDMessageManager manager = wdComponentAPI.getMessageManager();
     manager.reportSuccess("EPCM event testing " + dataObject);
//@@end
My problem is now that the event is fired correctly by the JSP Dynpage but the event-handler of the WebDynpro is never executed.
As info: the domain of the J2EE-Server the webdynpro-application is deployed to is identical to the J2EE-Server the portal runs on.
Can anybody help ?
Thanks !
Bernd

Hi All,
I found the solution by myself.
For information: Click in the dynamic navigation fires the event und forces the content afterwards to refresh. During the refresh the WebDynpro subscribes to the event in the wdDoInit-Method. This is to late because the event is fired before the refresh.
My solution is to use a setTimeout before the event-triggering in the dynamic navigation iView.
Regards,
Bernd

How to pass events from enclosed JApplet to enclosing JFrame?

Perhaps a bit of an obscure problem, but I have an application here that involves displaying JApplets within a JFrame. As long as I do nothing to give the displayed JApplet focus, I am able to use keyboard shortcuts to access my various JMenu items. However, the moment I interact with the JApplet and it gets focus (say, by entering text in a JTextField), those keyboard shortcuts no longer work.
I imagine what's happening is that the JApplet assumes that it must be the root component and does not pass events up to the superclass. Is there any way to allow the events to be passed on from the JApplet to the enclosing JFrame? Is this even possible?
Any help would be greatly anticipated.
- Fromage

Hi FTD,
I just about get your example; it is like a containment hierarchy right - one current, one proposed?
If it is required that there is only one base class to maintain, I am positive this can be satisfied. I suppose our ideas are similar... the point I was trying to make though is that you can implement you AnalysisClasses independent of the top-level container it resides in. The JApplet itself perhaps just needs to handle/marshal <applet> parameters (if any) while the JFrame has only JFrame specific initalisation to take care of - this can feasibly be done from the main method of the AnalysisClass. Effectively you get:
JFrame --> JDesktopPane --> JInternalFrame x 3 --> AnalysisClass
or
JApplet --> AnalysisClass
I do not fully understand what role the BaseGUIClass has... in my example, I have omitted it assuming its functionality could be redistributed to AnalysisClass or one of JInternalFrame or JApplet. Does it contain a lot of initialisation code and therefore am I wrong to make this assumption?
'The application GUI itself is simple...', would this be the AnalysisClass and does this mean it can be dropped into a JFrame or JApplet and manage itself? If so, but not to annoy you, I would still recommend the JInternalFrames.
I think it would frustrate me quite a bit if my superiors were rigid... it is very possible to implement this so that there is only one version of a class to maintain. The question is how much programming is required to achieve this. In my opinon, not a lot; perhaps with respect to your bosses/dealines, too much.
Here's an idea:
public class ApplicationGUI extends JApplet
    public void initialise()
        AnalysisClass tool = null;
        switch (Integer.parseInt(getParameter("toolType")))
            case 1:
                tool = ....
            break;
            case 2:
                tool = ....
            break;
            case 3:
                tool = ....
            break;
        if (tool != null)
            setContentPane(tool);
    public void start()
    public void stop()
    public void destroy()
    public static void main(String[] args)
        JFrame jFrame = new JFrame("Application Name");
        JDesktopPane jDesktop = new JDesktopPane();
        JInternalFrame jiFrame1 = new JInternalFrame("Tool 1", true, true, true, true);
        JInternalFrame jiFrame2 = new JInternalFrame("Tool 2", true, true, true, true);
        JInternalFrame jiFrame3 = new JInternalFrame("Tool 3", true, true, true, true);
        jDesktop.add(jiFrame1);
        jDesktop.add(jiFrame2);
        jDesktop.add(jiFrame3);
        jFrame.setContentPane(jDesktop);
        jFrame.setVisible(true);
}BTW if you managed to add the JApplet to a JPanel, why couldn't you add it to the JFrame?
Kind regards,
Darren
ps. are you based in England?
pps. apologises for making your name sound like STD, lol
ppps. apologies for posting code when you prob don't want it... I am at work, bored.

Passing data from one UIX XML page to another UIX XML page

What are the various ways of passing data from one UIX XML page to another UIX XML page?
(a) If no bc4j is used.
(b) If bc4j is used.
(c) If my event handler calls:-
public static EventResult handleMyEventEvent( BajaContext context, Page page, PageEvent event) throws Throwable
then how can I pass data to the next UIX XML page?
Thanks,
Paul.

What are the various ways of passing data from one UIX XML page to another UIX XML page?
(a) If no bc4j is used.For forwarded URLs; HttpServletRequest attributes [request], HttpSession attributes [session], ServletContext attributes [application].
For redirected URLs; HttpServletRequest parameters url, HttpSession attributes [session], ServletContext attributes [application].
(b) If bc4j is used.For forwarded URLs; BC4J Session properties.
For redirected URLs; BC4J Session properties IF release mode is NOT stateless.
(c) If my event handler calls:-
public static EventResult handleMyEventEvent( BajaContext context, Page page, PageEvent event) throws Throwable
then how can I pass data to the next UIX XML page?Return a UIEventResult (extends EventResult) from your event handler that has a data provider attached.
This data provider will be accessible in the next page with the name "ctrl:eventResult", where "ctrl" is the short prefix for the namespace "http://xmlns.oracle.com/uix/controller".
Regards,
John Fallows
Oracle Corporation.

How many method can pass data from Database to front-end(aspx)?

How many method can pass data from Database to front-end(aspx)?
By using ajax, I want show some data to aspx or html
Here is one of these method,
HTTP Handler(ashx):
we can json data, use HTTP Handler pass data to front-end
And can we do this by other method? Web API? or some fancy way?
Thanks for any reply

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Passing handles from C to LabVIEW

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