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

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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

Can Any one tell me what is the step in calling a function from a *.lib file in Labview application

Hi, I am working on Labview 8.0.
I am trying to communicate to a thrid party HW using the driver file he has provided to me.
The drive file is a *.lib file.
I am unable to call the function from the lib file.
I could get only from a DLL.
Pls help .
Regards
-Patil

patil wrote:
When it is possible in Lab Windows, why calling a function from a static library is prohibited?
I was trying to use Function node, but found that it is only for functions from a DLL file.
Will CIN be useful.?
LabWindows is not the same as LabVIEW. LabVIEW cannot call .lib files. LIB files are intermediary products and you need to use a wrapper DLL that's compatible with the object format of the .lib file. It's as simple as that. LabWindows creates C application and from that perspective is no different than a regular C
compiler. That's why you can call .lib files because that's how .lib
files are used.
A CIN, as pointed out, is something completely different and will not help you.

How can I call a function from a procedure

I have a function named: f_calc_value which return the variable v_result. This function is part of a package.
How can I call this function from a new procedure I am creating?
Thanks

or refer this theread....calling function from procedure

How to call a function from a JAR file

Hi ALL,
I am trying to call a Public function from a JAR file from my JAVA
file. Can you please provide an example or suggest a good resource?
Basically my java file Test.Java should call a function called 'export_a_doc' from a JAR file Export.jar. How do I refer this in my Java file and call 'export_a_doc'?
Thanx

Hi,
HERE IS MY JAVA FILE
// We need this for Starting our Export Process
import com.newexport.Myclass;
public class MyTest {
     // Our function to Start Export
     protected static void test(String[] args) {
     System.out.println("Starting. \n---------------------");
     Myclass p = new Myclass();
     try {
p.Start_Export(args);
System.out.println("Finished. \n---------------------");
     } catch(Exception e) {
e.printStackTrace();
     public static void main(String[] args) {
     test(args);
HERE IS THE BATCH FILE TO BUILD AND RUN
cd \JNI\Srcs
echo "-------------"
c:\JBuilder7\jdk1.3.1\bin\javac -classpath C:\JNI\Export.jar MyTest.java
echo "-------------"
\JBuilder7\jdk1.3.1\bin\java.exe -classpath c:\JNI\Export.jar MyTest
The Export.jar uses other jar files
Raj

HTML/javascript interaction with swf content - can I call swf functions from JS?

Hi,
I've created an AIR application where the
intialWindow.content is a HTML page / JavaScript application. On
this HTML page I want to include some SWF content as a plugin (a
Flex 3 app), so I have an object tag.
From my SWF I can call out to JavaScript using
flash.external.ExternalInterface fine. I can also call methods
within the AIR and Flex APIs via the window or runtime objects.
However, if I try to call methods within my SWF from
JavaScript, nothing happens. Further, I can pass a function
reference from my SWF to JavaScript (via ExternalInterface), and
while I can see a valid function reference in JavaScript, calling
it doesn't call the function within the SWF.
Is this not supported? Or is this something else, like an
applicationDomain issue? My SWF object is loaded via the app:/ uri,
so I didn't think it would be that.

I hadn't tried that, and it does work. Thank you. Everyone
should note though that the documentation here
Flex
3 - External Interface
and
Flash
9 - ExternalInterface.html
says:
"Note: Adobe AIR currently does not support the
ExternalInterface class."
which by my reading means that none of this should work,
although it clearly does.
The page
Example:
Using the external API with a web page container was most
helpful in finding the solution, since it mentions referencing the
object id of the plugin (e.g.
window['my-object-id'].functionToCall()) when referencing the
callback function.
This
page has a more concise example.

How can we call actionscript functions from js

hi
how can we call Action script function from js file . i
tried ExternalInterface. add Callback() .but it throws an error .is
there any other chance to call action script method .thnx in
advance

angadala,
some people have found it is good to include the full
qualification path, ie
if (flash.external.ExternalInterface.available)
flash.external.ExternalInterface.addCallback("ext_method_name",int_method_name);
} // if (flash.external.ExternalInterface.available)
There are also browser differences which affect how you find
the Flex application object which are documented at
http://www.adobe.com/livedocs/flex/3/html/help.html?content=passingarguments_5.html
Richard

Can I call a "function" from a servlet?

A few of my servlets need to perform about the same computations (have large sections of identical code).
It would save some disk space to be able to call a procedure from different servlets.
Can this be done? How?
Thank you all.

A few of my servlets need to perform about the same
computations (have large sections of identical code).
It would save some disk space to be able to call a
procedure from different servlets.
Can this be done? How?This wouldn't be the way to do it.
Since Java is an object oriented programming language, you should use it's concepts to implement a 'basic' class and than extend it. This means: Create a class that contains the basic procedures (you will never create an instance of this class) and then create all the serlvet classes by extending the 'mother' class. Like this you have the common code once in the 'mother' class and the specific code in the specific servlets.

ADF: Can i call javascript function from java clsss method in ADF?

Hi,
I want to call javascript function in Java class method, is it possible in ADF? , if yes then how?
or I need to use Java 6 feature directely?
Regards,
Deepak

private void writeJavaScriptToClient(String script)
FacesContext fctx = FacesContext.getCurrentInstance();
ExtendedRenderKitService erks = Service.getRenderKitService(fctx, ExtendedRenderKitService.class);
erks.addScript(fctx, script);
}usage
StringBuilder script = new StringBuilder();
script.append( "var popup = AdfPage.PAGE.findComponentByAbsoluteId('p1');");
script.append("if(popup != null){"); script.append("popup.show();"); script.append("}");
writeJavaScriptToClient(script.toString());Timo

How can i call my function from a procedure?

My function is:
create or replace FUNCTION test(pAttributeName IN NUMBER)
RETURN VARCHAR2 IS
ret VARCHAR2(100) := NULL;
VAR n1 NUMBER
BEGIN
SELECT Klartext INTO ret FROM piclist WHERE ATTRIBUTNAME = 'voltage_level' and PICLIST_ID =pAttributeName;
RETURN ret;
Insert into BM_ATTRIB(ID_ERFASSUNG,ID_ATTRIBNAME,ATTRIB_CHA,BM_ATTRIB_ID) VALUES(1,1,ret,1);
exception
when no_data_found then
ret := 'AAA' ------- you can return any default value,if you like
--return ret;
return NULL;
when others then
dbms_output.put_line('Exception:'||sqlerrm);
End;
I want to call it from a procedure!
Please help!
Nicole

if the function is in the same package as the procedure then merely specify the function name and parameters:
retcode := functionname(param1..paramn);
If in another package then:
retcode := packagename.functionname(param1..paramn);
If the function is in another schema then you need to grant execute rights to the package/function to the schema trying to run the function:
grant execute on packagename/functionname to otherschema;
you need to be the package/function schema owner to do the above grant.

Segmentation fault when calling gpctr function from matlab mex file

I am trying to write a simple mex file for square wave generation using counter1 of PCI-6035E. I am using matlab's native compiler to compile and link with the nidaq32 library, ver.6.9.3, with no errors. When the mex function is called from a matlab script, however, the program crashes at the first call, to reset the counter. (I can generate a square wave with the test panel.)

Sorry for the delay in responding. I got caught up in other stuff. I am attaching my little program as requested. As you can see, I have just wrapped a mexFunction call round the example code for square wave generation. After I posted this, I tracked down a copy of BorlandC++, installed it on my computer and recompiled using that compiler and *b.* libraries. And would you know it, the program works. The question remains, though, why it doesn't work with Matlab's native lcc compiler. Plus, I have limited disk space, so if I can do without BorlandC, I can use the extra room. The runtime error was a Segmentation fault that I traced to the first call to GPCTR_Control.
Attachments:
pulsegen.c ‏4 KB

How can i call a function of a swf-file which is embedded as a Resource in 3D-Annotation?

Hi.
I use a Flash-menu as an embedded *.swf in a 3D-Annotation. Now i want to trigger one of the ActionScript-Function out of the 3D-Annotation.
How can i get access to that function?
Cause of it is embedded, the callAS() Methods still not possible. But how else can i do that?
Can u give me a simple example? How is the usability of Flashvariable in the Ressource-Tab of 3d-Annotation?
Kind regards
Florian

It depends to some extent on how your SWF has been bound to the 3D scene. If you have bound it using a script, then you have a FlashMovie object that has a .call() method - but if you've attached it to something using the binding option on the Resources panel you will need to collect a reference first. If you know you are going to talk to the SWF it's best to bind it using JavaScript.
Let us assume you have a SWF in the resources collection but it's not bound to anything. In the 3D scene there is an object called 'cube' on which the SWF must appear as a material, and the SWF has declared a function to the ExternalInterface engine that is called "myFunction", which expects a string as a variable. Here's what you would put in the script attached to the 3D scene:
var fm = new FlashMovie("demo.swf");
var matl = scene.meshes.getByName("cube").material;
matl.useFlashMovie(fm);
fm.call("myFunction","hello");
The call() method is strictly typed - for example if your AS function expects a boolean and you sent it a string, it will not execute. There is also a limit on the possible returned variables - e.g. you cannot send back an Object.
Note that commands sent in the other direction using ActionScript's ExternalInterface.call() method are targeted at document-level by default, not at the 3D API - so if your AS is trying to call something it must exist as a document-level JavaScript function. It is possible to divert this traffic into the 3D API using the FlashEventHandler object, but it gets complicated as your code must implement XML encoding of the traffic - this is done automatically by the document-level script but not by the 3D API.
To answer your second question, in the resources dialog you can define the FlashVars string which is passed to the SWF when it loads - this is the same URL-encoded set of variables that you would send to a SWF when embedding it in an HTML page. It's a static string; you cannot read or edit it with JavaScript but this means it will still work if the user disables the JavaScript engine.

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

Calling JavaScript function from Servlet ?

I have a Servlet that needs to call a general purpose JavaScript function to retrieve some data. The JavaScript function sits in a file on the web server called general.js.
How can I call this function from my servlet to retrieve an integer result ?
Sarah.

http://developer.netscape.com/docs/manuals/js/client/jsguide/index.htm
Look for Java to JavaScript communication.

Can I call a function with an arguement of %ROWTYPE directly from SQL?

I have the following function in a 10g DB:
CREATE OR REPLACE FUNCTION f_is_eligible2 (in_dm_row IN amplify_dm%ROWTYPE)
RETURN NUMBER
IS
I know I can call that function from another pl/sql function but I'm wondering if I can call that function directly from a SQL statement, something like this:
SELECT f_is_eligible2(dm.*)
FROM amplify_dm dm
or
SELECT f_is_eligible2(dm%rowtype)
FROM amplify_dm dm
neither of those worked so I'm thinking it's not possible but I thought I'd ask anyway.
Thanks in advance!

Not possible as said - but - based on what I'm seeing - you could simply pass the parameter(s) that are key on that table and - accomplish the same thing by modifying the function.
not sure why you'd need the whole row if I'm interpretting the code excerpt.

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

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