Calling a function from a dll written by using visual studio c++

Hi, how can i call a function from a dll which is written by visual studio c++ in test stand? Although the functions in dll are exported and i've chosen c/c++ adapter, i saw no function in test stand. Is there a different step while i'm calling a function from a dll written by c++ than calling a function from a dll written by cvi?

Hey Sadik,
Selecting the C/C++ DLL Adapter Module should be sufficient for this. When you drag an action step for this onto the Main Step and navigate to the location of the DLL, the function list should populate and you should be able to select the function you want to use. If this is not the case, would you be able to post this DLL so that we can test this on our end?
Regards,
Jackie
DAQ Product Marketing Engineer
National Instruments

Similar Messages

Calling a function from a DLL, exectution in background mode.

Dear Experts,
We have created an ABAP report the calls a function from a DLL file. If the report is executed in on-line mode the program calls and executes the function from the DLL, but if the ABAP programa is executed in background mode it doesnt calls the DLL function.
Do you know a way to solve the problem when executing in background mode?
Best regards.
Antonio

Hi Gabriel,
Let me explain in details about my DLL function.
We are importing the business partners from legacy system into the SAP CRM system, so at the moment we created the BP master data via BAPI, I get the name of the BP and this moment I call the function in the DLL file. I export the parameter name and I receive back a simplified string with the name reduced to a code. This code I get back from the dll it is insert in a Z table, so there is no interaction in the screen, all must be executed in background mode, because there are a lot of business partners to be converted in SAP system.
I am sending my code for your considerations.
Instancia a DLL
CREATE OBJECT dll 'MTCODE.CPFONET'.
IF sy-subrc NE 0.
    RAISE without_dll.
ENDIF.
Move para a tabela interna IT_NAME os valores recebidos na TI_NAME
it_name[] = ti_name[].
Para cada registro importado
LOOP AT it_name.
    CLEAR v_string_ret.
    wa_matchcode-zregid     = it_name-zregid.
    wa_matchcode-name1_text = it_name-name1_text.
    v_string = it_name-name1_text.
    CONDENSE v_string.
    TRANSLATE v_string TO UPPER CASE.
    CALL METHOD OF dll 'SetNome' EXPORTING #1 = v_string.
    CALL METHOD OF dll 'ExecMatch'.
    CALL METHOD OF DLL 'GetMCData' = v_string_ret.
    FREE OBJECT dll.
Preenche os campos do match-code de acordo com o retorno da DLL
    SPLIT v_string_ret
    AT '|'
    INTO wa_matchcode-zparmcln
         wa_matchcode-zparmcfn
         v_empty
         wa_matchcode-name_first
         wa_matchcode-name_last
         wa_matchcode-namemiddle.
Adiciona o registro com o match-code correspondente na TE_MATCHCODE
    APPEND wa_matchcode TO te_matchcode.
ENDLOOP.

Can I call a function from a dll in LabVIEW that returns:double*string and int.?

I have a function from a dll that return a double* string and an integer. How can I call this function from LabVIEW? There is a possibility to work in LabVIEW with a double* string?

pcbv wrote:
> Hello all, The header of the function is:
>
> "HRESULT WRAPIEnumerateDevices(WRAPI_NDIS_DEVICE **ppDeviceList, long *plItems);"
>
> where WRAPI_NDIS_DEVICE have this form:
>
> typedef struct WRAPI_NDIS_DEVICE { 
> WCHAR *pDeviceName; 
> WCHAR *pDeviceDescription; }
> WRAPI_NDIS_DEVICE; 
>
> The function is from WRAPI.dll, used for communication with wireless card.
> For my application I need to call in LabVIEW this function.
Two difficulties I can see with this.
First the application seems to allocate the array of references
internally and return a pointer to that array. In that case there must
be another function which then deallocates that array again.
Then you would need to setup the function call to have a pointer to an
int32 number for the deviceList parameter and another pointer to int32
one for the plItems parameter.
Then create another function in your DLL similar to this:
HRESULT WRAPIEnumExtractDevice(WRAPI_NDIS_DEVICE *lpDeviceList, long i,
CHAR lpszDeviceName, LONG lenDeviceName,
CHAR lpszDeviceDesc, LONG lenDeviceDesc)
if (!lpDeviceList)
return ERROR_INV_PARAMETER;
if (lpDeviceList[i].pDeviceName)
WideCharToMultiByte(CP_ACP, 0,
pDeviceList[i].pDeviceName, -1,
lpszDeviceName, lenDeviceName,
NULL, NULL);
if (lpDeviceList[i].pDeviceName)
WideCharToMultiByte(CP_ACP, 0,
pDeviceList[i].pDeviceDescription, -1,
lpszDeviceDesc, lenDeviceDesc,
NULL, NULL);
return NO_ERROR;
Pass the int32 you got from the first parameter of the previous call as
a simple int32 passed by value to this function (and make sure you don't
call this function with a higher index than (plItems - 1) returned from
the first function.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Call multiple functions from same dll with call library function

hi,
i am working on a project in wich we need to make a UI to read out a sensor network.
the UI should be usable in any project, but every node needs a different piece of code depending on the type of sensor with wich it is equipt.
so i need to be able to call different pieces of code when i need them, and still be able to use the UI in future projects with possibly new types of node we now don't have.
so someone told me to use DLL's, cause then i would be able to call the code i need the moment i need it.
but i have never worked with DLL's (just learned about this option 3 day's ago) so i have a question.
i know i can dynamicly change the DLL i call with the call library function, but can i dynamicly change the function i call from that DLL ?
or do i have to put a new call library function for each function i want to call, even if its from the same DLL ?
kind regards,
stijn

nazarim wrote:
ok so there is no (easy and ubderstandable) way for me to dynamicly change wich function i want to call from a certain DLL.
but now i started wondering, the path on the call library function is not ment to dynamicly change a DLL
but it does work so, if i am carefull, can i use it for that purpose or will labview give me a series of problems once i start using it in larger programs ?
Thepath on the Call Library Node can be used to load a different DLL. Obviously since you can't change the function name your other DLL would have to export exactly the same function name and of course with the same parameters. This is seldom the case so it is not the main use of the path input to the Call Library Node. It's main use is as indicated to load DLLs at runtime rather than at load time of a VI. So that an application can run even when the DLL is missing, until the moment the functionality from that DLL is needed.
If you can make sure that all your DLLs export the same function name with the same parameter you can use the Call Library Node to call into different DLLs through the path input. If however you would need to call different function names you would have to resolve to some DLL which does do the dispatching and invocation using LoadLibrary() and GetProcAddress(). But unless you need to go with DLLs for some reason using the Call By Reference Node can give you an even more flexible approach.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Application with a vi calling a function from kernel32.dll

I have a Labview application which runs very well.
I had add a vi using the functio GetSystemTime from the dll kernel32.dll. The vi calling the API function runs well. Then I tried to buil the application and it does'nt run anymore . A dialog box is opened : "access to a forbidden space memory. I don't understand.
Does anyone have an idea?
Thank you for your response.

I have made at test with this function but it runs on my system.
I have used LV 6.0.2 to LV 7.0 on a Win XP Prof. You can compare your solution with mine.
The VI will run once when the application is called. You will see current time.
Waldemar
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
Don't forget to give Kudos to good answers and/or questions
Attachments:
GetSystemTime.zip ‏23 KB

How to create PDF from Excel with Password Protection Using Visual Studio & Visual Basic

Could someone provide some VB code sample(s) to create a PDF file with password protection (Security Method - Password Security - Restrict Editing & Printing)?
I create a bunch of reports every week using an Excel 2010 addin that subsequently must be printed to PDF. I then have to manually edit the properties of each document in order to apply the printing restriction.
I'm using Acrobat X.
I've downloaded the SDK but have no idea which dll's to use or where to begin.
Thanks!
Ross

That's surprising & disappointing. I would have thought that this capability would have long since been requested.
Thanks for the heads up.

Calling a function from a dll given by a third party

Hi everyone,
I was given a dll that exposes several COM functions.
I want to call one of them (using java code) that is called LoginGUI() that returns a string.
How could I do that?
Thanks for your feedback.
I am working on a windows environement.

Use JNA.

Calling a native function from a dll

Hi all,
I want to call an api function exported from a dll using java. For example l like to call a function from kernel.dll (Windows). How can i do this. Do i have to create another dll for this?

hi,
you need to use JNI
you have to create de DLL , and call kernel32.dll in.
like that:
java_class.class ==> first_dll.dll ==> kernel32.dll

How to call a function of a dll

Hello,
I have to call a function from a dll. I have a description how to do that in Visual Basic but I don't find those command in Diadem 9.1.
Here is the command in Visual Basic:
Declare Sub oLIC Lib "LICENSE.DLL" (ByVal PrgNam As String, ByVal VerString As String)
PrgNam = "DiademScript"
VerString = "1.0.0"
Call oLIC(PrgNam,VerString)
Is such a call possible in Diadem?
Regards
Patrick

Hello Patrick!
This is not possible! This is one of the differences between VB/VBA and VBS. You have to wrap the DLL with a COM server or a DIAdem GPI DLL.
Matthias
Matthias Alleweldt
Project Engineer / Projektingenieur
Twigeater?

How to call oracle function from ejb3

i'm trying to call an oracle query-function from ejb3.
The oracle function:
create or replace FUNCTION getSecThreadCount(secId in NUMBER,avai in NUMBER)
RETURN SYS_REFCURSOR is cur SYS_REFCURSOR;
m_sql VARCHAR2(250);
BEGIN
m_sql:='select count(thrId) from thread where secId='|| secid||'
and thrAvai='|| avai;
open cur for m_sql;
return cur;
END;
I'v tried several ways to call it,but all failed:
1. the calling code:
public Object getSectionThreadCount(int secId,int avai){
 Query query=manager.createNativeQuery("{call getSecThreadCount(?,?) }");
 query.setParameter(1, secId);
 query.setParameter(2, avai);
 return query.getSingleResult();
but i got the exception:
Exception in thread "main" javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query; nested exception is: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
Caused by: java.sql.SQLException: ORA-06550: row 1, col 7:
PLS-00221: 'GETSECTHREADCOUNT' not procedure or not defined
ORA-06550: row 1, col 7:
PL/SQL: Statement ignored
2. the calling code:
@SqlResultSetMapping(name = "getSecThreadCount_Mapping")
@NamedNativeQuery(name = "getSecThreadCount",
query = "{?=call getSecThreadCount(:secId,:avai)}",
resultSetMapping = "getSecThreadCount_Mapping",
hints = {@QueryHint(name = "org.hibernate.callable", value = "true"),
 @QueryHint(name = "org.hibernate.readOnly", value = "true")})
public Object getSectionThreadCount(int secId,int avai){
 Query query=manager.createNamedQuery("getSecThreadCount");
 query.setParameter("secId", secId);
 query.setParameter("avai", avai);
 return query.getSingleResult();
but i run into the exception:
Exception in thread "main" javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query; nested exception is: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
Caused by: java.sql.SQLException: lost in index IN or OUT parameter:: 3
By the way, i have successfully called the function from hibernate. And i use oracle 11g, JBoss5 RC1.
Could anyone tell me how to call the function from EJB3?
Thanks.

Here's a working model:
package.procedure: (created in example schema scott)
CREATE OR REPLACE package body data_pkg as
type c_refcursor is ref cursor;
-- function that return all emps of a certain dept
function getEmployees ( p_deptId in number
return c_refcursor
is
 l_refcursor c_refcursor;
begin
 open l_refcursor
 for
 select e.empno as emp_id
 , e.ename as emp_name
 , e.job as emp_job
 , e.hiredate as emp_hiredate
 from emp e
 where e.DEPTNO = p_deptId;
 return l_refcursor;
end getEmployees;
end data_pkg;
/entity class:
package net.app.entity;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedNativeQuery;
import javax.persistence.QueryHint;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@SuppressWarnings("serial")
@Entity
@Table (name="emp")
@SequenceGenerator(name = "EmployeeSequence", sequenceName = "emp_seq")
@NamedNativeQuery( name = "getEmpsByDeptId"
 , query = "{ ? = call data_pkg.getEmployees(?)}"
 , resultClass = Employee.class
 , hints = { @QueryHint(name = "org.hibernate.callable", value = "true")
 , @QueryHint(name = "org.hibernate.readOnly", value = "true")
public class Employee implements Serializable
 @Id
 @Column(name="emp_id")
 @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "EmployeeSequence")
 private int id;
 @Column(name="emp_name")
 private String name;
 @Column(name="emp_job")
 private String job;
 @Column(name="emp_hiredate")
 private Date hiredate;
 // constructor
 public Employee (){}
 // getters and setters
 public int getId()
 return id;
etc...session bean:
package net.app.entity;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import net.app.entity.Employee;
import net.app.iface.ScottAdmin;
@Stateless
public class ScottAdminImpl implements ScottAdmin
 @PersistenceContext
 private EntityManager entityManager;
 @SuppressWarnings("unchecked")
 public List<Employee> getEmployeesByDeptId(int deptId)
 ArrayList<Employee> empList;
 try
 Query query = entityManager.createNamedQuery("getEmpsByDeptId");
 query.setParameter(1, deptId);
 empList = (ArrayList<Employee>) query.getResultList();
 return empList;
 catch (Exception e)
 e.printStackTrace(System.out);
 return null;
}client:
package net.app.client;
import java.util.List;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import net.app.entity.Employee;
import net.app.iface.ScottAdmin;
public class ScottClient
 public static void main(String[] args)
 try
 // create local interface
 InitialContext ctx = new InitialContext();
 ScottAdmin adminInterface = (ScottAdmin) ctx.lookup("ScottAdminImpl/remote");
 // select employees by deptno
 int deptno = 20;
 List<Employee> empList = adminInterface.getEmployeesByDeptId(deptno);
 // output
 System.out.println("Listing employees:");
 for (Employee emp : empList)
 System.out.println(emp.getId() + ": " + emp.getName() + ", " + emp.getJob() + ", " + emp.getHiredate());
 catch (NamingException e)
 e.printStackTrace(System.out);
}Basically you just ignore the refcursor outbound parameter.
This is a stored function, have yet to try outbound refcursor parameters in stored procedures...
Edited by: _Locutus on Apr 2, 2009 2:37 PM

Calling C Functions in existing DLL's from Java

Hi Guys ,
The tutorial in this site talks about creating ur own DLL's and then calling them from Java . I need to call C functions in existing DLL's from Java . How do I go about doing this ? . Any help on this would be much appreciated.
regards
murali

What you are interested in can be done with what's called "shared stubs", from the JNI book (http://java.sun.com/products/jdk/faq/jnifaq.html), although you don't need the book to do it (I didn't).
The example code will call functions with any number and kind of parameters, but doing that requires some assembly language. They supply working examples for Win32 (Intel architecture) and Solaris (Sparc).
If you can limit yourself to functions to a single function signature (number and types of parameters), or at least a small set that you know you'll call at compile time, you can modify the example so that the assembly language part isn't needed, just straight C code.
Then you'll have one C library that you compile and a set of Java classes and you can load arbitrary functions out of arbitrary dynamic libraries. In my case you don't even have to know what the libraries and functions are ahead of time, the user can set that up in a config file.
You mentioned doing this with Delphi. One thing to watch out for is C versus Pascal (Win32) function calling convention. A good rule of thumb; if it crashes hard, you probably picked the wrong one, try the other. :-)

Can LabVIEW call a function from a .sys file or is LabVIEW limited to dll access?

My vendor has sent me a .sys file with functions accessing their hardware. Can i call these function from labview directly or do I have to wrapper the .sys with a dll?

Well a sys file is a kernel device driver. LabVIEW does not have any direct way of accessing such a driver. The way kernel drivers are accessed is usually through a DLL which makes calls to WinAPI functions such as CreateFile(), ReadFile(), WriteFile(), CloseHandle() and DeviceIORequest(). Since these WinAPI calls are basically just DLL calls too, you could theoretically use the Call Library Node to call them and access the kernel device driver in such a way.
However for any kernel device driver with more than one or two device driver calls, it will certainly be easier in terms of development, debugging and maintenance of the code, to write actually a dedicated DLL in C/C++ for this device driver and access that DLL from LabVIEW, especially if you consider the LabVIEW datatype limitations when designing the DLL interface (Basically this same DLL can then be called from any other Windows development environment, be it Visual Basic (similar datatype limitation as LabVIEW), Delphi, (Visual) C, LabVIEW or also various scripting environments like Python and Lua.
Some of the necessary WindAPI calls are rather involved and pose quite a bit of trouble to get the parameter data right in LabVIEw.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Calling a Function from another Function within CFC

Hi all,
I have many functions in my CFC that do various things, but
one query is a query that selects absolutely every record from a
table.
The thing is, I need to do a query like this in another
function to obtain only a recordcount of the same table used in
both separate functions. Instead of writing the query out again,
how can I utilise the function already written?
My question is, how can I invoke and use the results of a
query in one cffunction for another cffunction in the same CFC
component?
An example may look like the code attached...
Many thanks for your patience and help!
Mikey.

quote:
Originally posted by:
Dan Bracuk
Generally, to call a function from within a cfc, you do
exactly what you do outside a cfc.
For your specific case, if your requirements permit it, you
might consider caching the big query for a couple of seconds. Then
you can continously call the function and not have to wait for it
to run and bring back the data each time.
Do you mean to say that within a CFC function I can execute
the same cfinvoke tags I use in normal CFM pages?
Mikey.

How do I call a function from another file?

In MainView.m I have one function -(void)goTell;
I want to be able to call the function from SecondView.m. How do I do this?
I have declared the function in the MainView.h and added #include MainView.h to SecondView.m, but it still doesn't work.
This code crashes my program (for some reason this board takes away my brackets... assume the code is written correctly):
[[MainView alloc] init];
MainView *myMainView;
[myMainView goTell];
By the way... goTell has nothing in it. It's just a blank function for testing purposes.
Ethan

BTW - Wrap your code like this in posts tags so it stay readable.
put code here
Your code needs to be:
MainView *myMainView = [[MainView alloc] init];
[MyMainView goTell];

How do I call Vee functions from TestStand ?

I wish to call Vee functions from TestStand steps.
I am using Vee 6.01 and TestStand 2.0.

Hi Gerry,
Sorry about that. Below is a sequence file created in 2.0.1f1. Please copy the contents of the zip file (previous attachment) into the folder \Examples\VEE\Using ActiveX (VEE 6.0). Please create this directory if it does not exist. The next thing you will need to do, is register the TestStand VEE server located in \Examples\VEE\Using ActiveX (VEE 6.0)\VEE_StepType.dll. To do this:
1) Select Start>>Run.
2) Type regsvr32 "C:\TestStand\Examples\VEE\Using ActiveX (VEE 6.0)\VEE_StepType.dll"
You should get a message saying that the registration was successful. You should now be able to run the example. Please let me know if you encounter any further problems. Thanks!
Attachments:
Computer.seq ‏66 KB

Calling a function from a dll written by using visual studio c++

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