Is it possible to call dll-functions with records/types as arguments?

or must I use the fixed preselection of types

LabVIEW must call DLLs with data types it is compatible. Therefore, you must use the types available through LabVIEW.
I have two pieces of advice on this matter:
First, contact NI and get their advice on how to call your data type. They may be able to offer a very quick solution.
Second, if you cannot call these data types, and you have a compiler, I would suggest "wrapping" the DLL inside another, and 'translate' the data type from something LabVIEW can handle, to the type needed by your DLL in this 'wrapper' DLL.

Similar Messages

Is it possible to call a function with the same name from 2 different dll's at the same time.

I'm trying to call a function ( F ) form 2 different libraries ( A.dll and B.dll ) at the same time. The first lib loaded determines the function F. A->F and B->F have same interface and name but different implementation.

Hi,
I tried it with two dll's, both with the same interface, and at the same
time, in the same VI. The popups even appear at the same time.
But now I understand the problem... Both dll's are created by LabVIEW! If
they are not (or one is not, and the other is), this is no problem.
And VI's in memory cannot have the same name. LabVIEW doesn't care if VI's
are in a dll or not.
This might not help, but if you want to make some sort of "plug in" system,
you might consider using llb's. By loading VI's dynamically, you can select
the path from which they are loaded. You must unload (close all references)
one before the loading the other, or the same problem will occur. If you go
this way, I consider a different approach. Make on
e library (or even a dll)
that has the interface you like, this is the "loader". Now make several
"plug in"'s, with the same interfaces. The name of each function in a plug
in is a concatenation of the library name and the function name. The loader
has one extra function, that loads (and unloads, when done) references to
all desired libraries to use (the names of the functions can be figured out
easily). All that the loader functions do is dynamically call the library
functions. You can use a call by reference node for this (you can use the
connector pane or the loader vi, since the interface must be the same!).
If you go this way, I guess the loader library can be converted to a dll...
Hope this helps.
Wiebe.
"rsam" wrote in message
news:[email protected]..
> Thx Wiebe,
>
> did you load both dll at the same time? For example in 1 vi. Somehow
> the first loaded function keeps to overrule the second. Notice that
> the interface is
exactly the same.
>
> I loaded 2 dll created in Labview with results described above.
>
> Regards Ruud

Call DLL function with pointer to simple struct

Hello,
I try to call a function using CLFN. My problem is the parameters of the function I try to access.
Here is the function and his parameter:
typedef struct {
int major;
int minor;
int revision;
int build;
} VersionNumberType;
int Comm_BTE_softVersion( VersionNumberType *pVersion)
BYTE byBuffer[2048] ;
if( !Comm_BTE_readYMem( byBuffer,COMM_BTE_TX14_SOFTVERSIONADDR,
COMM_BTE_TX14_SOFTVERSIONSIZE))
return FALSE ;
//. process the answer
pVersion->major = (int) (byBuffer[0] & 0xFF) ;
pVersion->minor = (int) (byBuffer[1] & 0xFF) ;
pVersion->revision = (int)( byBuffer[2] & 0xFF) ;
pVersion->build = (int) ((int) ( byBuffer[4] << 8) ) | ((int) ( byBuffer[5] ));
return TRUE ;
} //. end Comm_BTE
In attached file there is the Comm BTE soft Version.vi that try to access this function. The code crashes when the function is called and labVIEW is closed.
I probably don't pass the data parameters correctly to the CLFN.
Thanks for help.
Regards. NewCLAD.
Solved!
Go to Solution.
Attachments:
Comm BTE soft Version.vi ‏13 KB

Everything is configured correctly EXCEPT the numeric representation of the values in the cluster. They must match int, which is most likely 32 bits on your platform. In your VI, they are U8.

Error while creating function with record type as return type

Hi i tried the following code to get the nth highest sal using record type and function.
CREATE OR REPLACE PACKAGE pack_rec_cur AS
TYPE rec_type IS RECORD (
name EMP.ename%TYPE,
sal EMP.sal%TYPE);
END;The above package is created
CREATE OR REPLACE
FUNCTION fun_rec_cur(n INT) RETURN pack_rec_cur.rec_type AS
   rec pack_rec_cur.rec_type;
    CURSOR cur_rec IS
      SELECT ename,sal
        FROM emp
         WHERE sal is not null
          ORDER BY DESC;
BEGIN
OPEN cur_rec;
FOR i IN 1..n LOOP
   FETCH cur_rec into rec;
   EXIT WHEN cur_rec%NOTFOUND;
END LOOP;
CLOSE cur_rec;
RETURN rec;
END;   The above function is giving errors
LINE/COL ERROR
4/7      PL/SQL: SQL Statement ignored
7/16     PL/SQL: ORA-00936: missing expression
SQL> Could you please correct me where i'm doing mistake
Thanks.

You are missing the column name in order by clauase. Is it ename desc?
CREATE OR REPLACE
FUNCTION fun_rec_cur(n INT) RETURN pack_rec_cur.rec_type AS
   rec pack_rec_cur.rec_type;
    CURSOR cur_rec IS
      SELECT ename,sal
        FROM emp
         WHERE sal is not null
          ORDER BY ENAME DESC; ---added ename
BEGIN
OPEN cur_rec;
FOR i IN 1..n LOOP
   FETCH cur_rec into rec;
   EXIT WHEN cur_rec%NOTFOUND;
END LOOP;
CLOSE cur_rec;
RETURN rec;
END;
-OUTPUT
SQL> SET SERVEROUT ON
SQL>
SQL> DECLARE
2     rec            pack_rec_cur.rec_type;
3 BEGIN
4     rec         := fun_rec_cur (6); --you get the 6th record in order of ename desc
5     DBMS_OUTPUT.put_line ('ename::' || rec.NAME || ' sal ::' || rec.sal);
6 END;
7 /
ename::MARTIN sal ::1250
PL/SQL procedure successfully completed.
SQL>

Is it possible to call DLL develloped with LabView 7.0 in LabView 6.0.2 VIs?

Hello,
I would like to devellop DLLs in LabView 7.0 and use them in LabView 6.0.2.
Is it possible???
I tried this operation. I generated an installer (with the LabView 7.0 runtime in) and tried to load the DLL in a LabView 6.0.2 VI.
When I run the VI, LabView 6.0.2 is crashing...
Here my export function prototype:
typedef struct
LVBoolean status;
long code;
LStrHandle source;
} TD1;
typedef struct
long dimSize;
unsigned char Numeric[1];
} TD2;
typedef TD2 **TD2Hdl;
void __cdecl driver(LVBoolean *SendCommand, unsigned char DataToSend[], long LenDataToSend, char RHICommandString[], TD1 *errorInNoError, LVBoolean *GetAnswer, LStrHandle *FrameReceivedID, long *Da
taLength, TD2Hdl *DataReceived, TD1 *errorOut);
Any example ???
Thanks for your help,
Regards, Pascal.

Hi Pascal,
I made a simple dll in LabVIEW 7 and called it from LabVIEW 6.0 and it worked fine.
I have attached the dll I built. It adds two numbers.
double Testdll(double B, double A);
Try using this and see if it works for you.
Feroz
Attachments:
SharedLib.dll ‏17 KB
SharedLib.h ‏1 KB
SharedLib.lib ‏3 KB

Application crashes when calling DLL built with LabVIEW 2011

Hello everybody,
Our application calls DLLs built with LabVIEW 2010 SP1. We installed LabVIEW 2011 and built some DLLs. So far so good. If we start our application and run 2010 DLLs it still works fine. If we run a 2011 DLL just once no error happens, but if we try to run the same 2011 DLL our application crashes reporting the error below. I saved the code for 2010 version and built a DLL and it works fine. Does anyone know why?
Thank you in advance.
#Date: Fr, 16. Sep 2011 16:25:25
#OSName: Microsoft Windows XP Service Pack 3
#OSVers: 5.1
#OSBuild: 2600
#AppName: PasTA
#Version: 11.0f2 32-bit
#AppKind: AppLib
#LabVIEW Base Address: 0x30000000
16.09.2011 16:25:26.181
Crash 0x0: Crash caught by NIER
File Unknown(0) : Crash: Crash caught by NIER
minidump id: 8a779b3f-51d7-4864-8e4d-6ab0195cd158
ExceptionCode: 0xC0000005
N
0x3072C804 - lvrt <unknown> + 0
0x3072CBB8 - lvrt <unknown> + 0
0x7C864191 - KERNEL32 <unknown> + 0
0x7C83AB50 - KERNEL32 <unknown> + 0
0x00000000 - PasTA <unknown> + 0
Attachments:
error.PNG ‏11 KB

On that note, you should be able to create DLLs in 2010 and run them with 2011, correct?? In my case, I have a 2010 built DLL (talking to sbRIO), most of the functions work when run in 2011, but a couple of them lock up LabVIEW on the desktop (but not the sbRIO), no lock ups happen with 2010 on the desktop.

Allocate memory and call dll function which writes to the pointer

Hi!
I have a DLL wich has a function like the following example, wich i need to call from labview. In C I need to allocate some memory for the data and of course the struct. I add the pointer and the lengh of the data to the stuct and call the function with the struct. The function itself inserts some values to the stuct and to allocated memory. Has someone a working solution how this can be done with Labview?
typedef struct Thestruct
UINT16 val1;
UINT8 val2;
UINT8 val3;
UINT16 dataLength;
UINT8 *data;
} T_Thestruct;
MY_API Status MY_API_CALL udaReceive(Handle handle, T_Thestruct *args);
I tried in labview (see picture), but I only got values inside the struct as well as the error 1097, the reserved memory inclues the same values as before.
Solved!
Go to Solution.
Attachments:
CallDll.PNG ‏21 KB

Tobias_BSH wrote:
OK, I found the soluton to my own Problem. The alignment on the struct must be corrected in Labview. There must be a 2Bytes dummy value between dataLength and the pointer.
And please not that your solution only works in LabVIEW 32 bit. In LabVIEW 64 Bit your DLL has to be 64 bit compiled as well in order to be loadable and the pointer then is a 64 bit integer and is usually aligned to 64 bit addresses too. In this particular case since the pointer is already aligned to a multiple of 64 bit (when the additional 2 alignment bytes are added) you won't have to modify the alignment for the 64 bit case, but you have to define a different cluster with the 64 bit integer for the pointer anyhow.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Call DLL function from JAVA

HI!
What's the best way (and simple) to call DLL function from JAVA.
DLL function (developed in C) has two input parameters (string) and return an integer.
Could you help with an example?
Thanks a lot.

Do a google search for 'JNI tutorial' and it will turn up hundreds of examples.

How to call a function with pl/sql

How does one call a function with pl/sql that uses a function?

Hi,
How does one call a function with pl/sql that uses a
function?I'm not sure what you mean.
In PL/SQL function can be used just about anywhere where an expression (with the same data type that the function returns). Arpit gave a very common example.
Here's another example, where all the functions take a single NUMBER argument and return a NUMBER, so they can all be used in places where NUMBERs are used:
IF fun_a (fun_b (0)) < fun_c (1)
THEN
    UPDATE table_x
    SET     column_y = fun_d (2)
    WHERE   column_z = fun_e (ROUND ((fun_f (3), fun_g (4)));You call a function simply by using its name, followed by its argument list, if any.
If the function is in a package, you must call it with the package name, like "pk_foo.bar (1, 2, 3)", unless the call comes from within the same package.
If the function is owned by someone else, you must give the owner name, like "scott.bar (SYSDATE)" or "scott.pk_foo.bar (1, 2, 3)". You can create synonyms to avoid having to name the owner.

Call outside function with same name in a package

I created a function as follows:
create or replace function f1 return number
is
begin
return 1;
end;
This f1 is to be called in a package created below.
Then I create a package with a function in it, as follows:
create or replace package pack1 as
function f1 return number;
end;
Now I define the package body as follows:
create or replace package body pack1 as
function f1 return number as
-- I am trying to call the first function f1 defined above here
How do I resolve the name issues here?
In other words, I want to call a function with the same signature outside a package.
Thanks for your kind help.

Hi,
Welcome to the forum!
Do you have a good reason for using the same name?
Refer to the stand-alone function with the owner name, even though it's your current schema.
That is, even if the package and the stand-alone function are owned by scott, in the package, say
x := scott.f1;

Is there a way to call a function with in the initializer of a ArrayCollection?

    Is there a way to call a function with in the initializer of a ArrayCollection?
It won't let me do this:
var ac:ArrayCollection = new ArrayCollection([
                    {childName:'addTrade',index:addTradeIndex },
                    {childName:'tradeList',dealsCanvas.getChildIndex(tradeList) }

The correct syntax is
var ac:ArrayCollection = new ArrayCollection([
                    {childName:'addTrade',index:addTradeIndex },
                    {childName:'tradeList',index:dealsCanvas.getChildIndex(tradeList) }

How to call a function with event

How do I call a function with a event inside it?
function showTopTen(e:Event):void
highscoreData = new XML(e.target.data);
trace("Hiscores: " + highscoreData.item[0].name.text() + " - " + highscoreData.item[0].score.text())
//showTopTen(); ..??

Could you indicate why you would want to?
The eventhandler you show here uses the properties of the event object passed as an argument.
The way I read it it is data retrieved from a server so your app won't know anything about is untill it is loaded from the server which should be done with an URLLoader object which in it's turn calls your eventHandler when the Event.COMPLETE is triggered.
something like:
var urlLoader = new URLLoader();
urlLoader.addEventListener( Event.COMPLETE, showTopTen )
urlLoader.load( new URLRequest( "http:// etc." ) );
to me would seem the proper method to have the function execute.

Is is possible to call a function or method before JVM exits ??

Hi All,
Is is possible to call a function or method before JVM exits where System.exit() is used.
I am calling a program where System.exit is used. i need to call a function before the JVM exits.
Please help me.
Thanks,
J.Kathir

How to call the method ? Did i have to call the shudown hooks method in my main class ?
Is it possible to have in subclass?
is the below code is correct ? i am calling a class before System.exit is called....
java.lang.Runtime.getRuntime().addShutdownHook(...My Own Class()....)

Is it possible to call Normal function Module from WD4A , Not RFCs

Is it possible to call Normal function Module(FM) from WebDynPro for ABAP , Not RFCs

There is no difference, unless you are specifically calling the RFC to connect to another system. If so, then you need to add the DESTINATION keyword to the function call and specify the destination name. This name must be defined in SM59. But, if you are not going to another system, you can call the RFC the same way you call the regular function module.
REgards,
Rich Heilman

Is it possible to call a webservice with just the url to its WSDL

hi all
can anyone tell me if it is possible to call a webservice with just the url to its WSDL file. must we create the proxy class for webservice client? thanks

if you are in the context of a J2EE 1.4 container, you do not need to generate any stub, you can use either a dynamic proxy mechanism or dynamic invocation.
check JWSDP tutorial.

Is it possible to call dll-functions with records/types as arguments?

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