How to write c wrapper it containing callback functions

hi here shambhu below call can be containing some call back functions ,how can create wrapper for this,please suggest me
_export int GDSRegisterStation(char *sPort, char* sPanel, int iStation, GDSCallback lpGDSTaskCall); /*
This call hooks up user application onto the GDS environment. From this point on, the GDS application has continuous, concurrent access to the virtual machine representing the test system. As multiple independent test systems may be hooked onto the same host computer, the call needs to specify a "Port" (unsigned uPort) to which GDS memory access is sought. Character string sPanel (up to 63 chars) identifies the calling GDS task to the Virtual Machine. This entry will assist the System Manager in monitoring active GDS tasks by their assigned names. As multiple test stations (each with one or more control channels) may be associated with the same controller, (int) iStation specifies the station to which this application will be connected. (GDSCallback) lpGDSTaskCal specifies the subroutine in the user application that is to be installed as the real-time callback into the Virtual Machine. From this moment on, the specified subroutine will be automatically called by the Virtual Machine to periodically All subsequent calls to the GDS library will apply to this Station and its control channels. This call is made only once and prior to other GDS calls. 0 is returned upon normal completion -1 is returned if the call was a failure due to absence of GDS space associated with the call. Make sure station is connected and On-Line and make sure Port No was correct in the call -2 is returned if the application was already registered by a previous call

You will have to write a wrapper DLL in C which converts the callback event into a LabVIEW compatible event. The most versatile way would be to generate a user event with the PostLVUserEvent() LabVIEW manager function. Callback functions are however an advanced C programming construct, so you should definitely have a pretty decent understanding of C programming before starting this endeavour. Otherwise you end up with a not working solution or maybe even worse, one that seems to work sometimes but doesn't really do the right thing.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Similar Messages

How to write a wrapper class

I am new to the concept of wrapper classes. I have a small spell checker program that I need to access via a servlet by passing a string in and getting a string out with spelling suggestions. I could really use some advice on how to write a servlet that would do such a thing. TIA

grin1dan wrote:
I am new to the concept of wrapper classes. I have a small spell checker program that I need to access via a servlet by passing a string in and getting a string out with spelling suggestions. I could really use some advice on how to write a servlet that would do such a thing. TIABasically, a wrapper class is a class that "wraps" another - otherwise referred to as a "HAS-A" relationship (as opposed to a sub-class, which involves an "IS-A" relationship). It does this by including an instance of the wrapped class as one of its fields.
In many cases, wrapping is actually superior to inheritance.
I don't know how this fits with your servlet, but - assuming that your SpellChecker is implemented as a class - all you need to do is have your servlet define a "spellchecker" field; perhaps something like:
private final SpellChecker spellCheck = new SpellChecker();Probably worth reading up on though. Google "wrapper classes" and "forwarders".
Winston

How to write SQL query and apply aggregate functions on it

Hello experts,
Iu2019ve a task to write SQL query on tree tables and do inner join on them. Iu2019ve accomplish this task by using T-CODE SQVI. However now I need to write a query and apply SQL functions on it i.e. Add, Count, Max and Min etc. Please can someone tell me how I can write SQL query with aggregate functions in SAP?
Thanks a lot in advance

HI Mr. Cool
you can see the below code for using aggregate functions.
where ARTIST and SEATSOCCU are the field names for which you want to perform these functions.
DATA: TOTAL_ENTRIES TYPE I,
      TOTAL_ATT TYPE I,
      MAX_ATT TYPE I,
      AVG_ATT TYPE I.
SELECT COUNT( DISTINCT ARTIST )
       SUM( SEATSOCCU )
       MAX( SEATSOCCU )
       AVG( SEATSOCCU ) FROM YCONCERT INTO (TOTAL_ENTRIES, TOTAL_ATT,
MAX_ATT, AVG_ATT).
Thanks
Lalit Gupta

How to write plug-in that provide COM functionality

Hi all experts,
Is it possible to write plug-in for Acrobat 8 / 9 which expose COM functionality that I can use from other application for example C# application.
or you can suggest any other way.
Please help...
Thanks,
Vikram

Yes, it is possible. I don't believe we provide a sample in the SDK any longer, however.
Just use standard Windows APIs to handle the COM aspects.

How to write the tech specification ?

hi can any 1 tell me how to write the technical specification when a functional spec is given.
guys i need a sample spec or format of it . any help is appreciated
please any one send some reports with code

Hello Selva
The first link provided by Vijayendra provides an already quite comprehensive specification. What I like in particular is chapter "1.15 Assumptions".
I add a similar chapter to my specifications called "Assertions" which I prefer to place more at the beginning of the document. This chapter contains all assertions (mainly provided by the customer) on which the application is based. For example: "The receiver (of certain costs) is either a single cost center or a cost center group but never both" (technically possible in the SAP transaction).
Within the application I try to document these assertions using checkpoint groups and assertions (more about this in the informative Weblog of Claudia Dangers /people/claudia.dangers/blog/2005/09/07/how-to-instrument-your-abap-code-with-checkpoint-groups).
Why do I place this chapter on top of the specification? The customer should see this assertions/assumptions quite early in order to find any mistakes.
Finally, what I have missed in the specification was a chapter "Authorizations".
Regards
Uwe

How to write a java function for use in where clause in SQL statement

Hi,
Does anyone know a good tutorial on how to write and include a Java class/function into Oracle.
I'd like to write mathematical function to use in my queries, but the resources available in PL/SQL are very limited.
Many thanx

Pim,
I see you got an answer in the PL/SQL forum.
But in case you haven't seen it, perhaps this Web page will help:
http://www.oracle.com/technology/tech/java/jsp/index.html
Good Luck,
Avi.

How to write DML operation in a function

Hi
Its very urgent for me.
I am writing DML operation directly in a function and is being called from select statement, it is getting error as "DML Operations cannot be performed inside a query".
How to write a DML operation inside a function.
My objective is to call that function from select statement.
Please help me out.
Thankd

No no no. You're committing after each row! soany
other session running the same query will see the
changes you're making. Your session will equallysee
changes caused by running this query in those
sessions.Other session, yes, but current session will only see
the changes once it has completed the current
statement. Otherwise my "rn" column would not have
gone up sequentially in the above example. it would
have gone
1st row rn = 1 (all rows get updated by 1:-
2,3,4,5,6,7,8,9,10,11)
2nd row rn = 3 (all rows get update by 1:-
3,4,5,6,7,8,9,10,11,12)
3rd row rn = 5 (all rows get update by 1:-
4,5,6,7,8,9,10,11,12,13)
4th row rn = 7 (all rows get update by 1:-
5,6,7,8,9,10,11,12,13,14)
5th row rn = 9 (all rows get update by 1:-
6,7,8,9,10,11,12,13,14,15)
6th row rn = 11 (all rows get update by 1:-
7,8,9,10,11,12,13,14,15,16)
7th row rn = 13 (all rows get update by 1:-
8,9,10,11,12,13,14,15,16,17)
8th row rn = 15 (all rows get update by 1:-
9,10,11,12,13,14,15,16,17,18)
9th row rn = 17 (all rows get update by 1:-
10,11,12,13,14,15,16,17,18,19)
10th row rn = 19 (all rows get update by 1:-
11,12,13,14,15,16,17,18,19,20)
So the fact the commit happens each time the rows get
updated, isn't effecting the currently running select
statement.
No, actually you DO see the other session changes. This is because it is AUTONOMOUS transaction, and this a function.
Test by adding:
create or replace function incvals return number as
pragma autonomous_transaction;
v_val number;
begin
update t set rn = rn + 1;
select max(rn) into v_val from t;
dbms_lock.sleep(1); --add this line
commit;
return v_val;
end;
And test in two sessions.
You will NOT get sequential ascending.
>
Think about the effect of two parallel sessionsboth
running this query at the same time, and ask isthis
sensible?Gawd, no, of course not. Like I said, I'd never use
this sort of thing myself. I'm just wondering what
on earth the OP is trying to achieve.
:)Glad to hear it.

How to write this assignment in oom way(long)

i try to write a new class, but i am not very sure if there is only one new class, I shall write a Movie class or a Ticket class?
this is my Movie class, if I also want to write a new Ticket class. and still i don't know how to write
because the Ticket class uses some of the attributes of the Movie class such as start time, Movie.name, as in this situation the relation
between Ticket and Movie is still aggregation, or become a generalization?
and how to represent that a Movie can have many Tickets? I shall write a buy-ticket method inside the Ticket class or Movie class.
(are there any thing not right with this movie class? thanks)
============================
class Movie
 String name;
 String startTime;
 String [] coupleChair=new String[11];//start from 1 to 10
 String [] singleChair=new String[11];//start from 1 to 10
 public Movie(String str1st)
 this.name=str1st;
 public Movie(String str1st, String str2nd)
 this.name=str1st;
 this.startTime=str2nd;
 public String buyA_Single_Ticket()
 int i=1;
 do
 if(this.singleChair!="sold")
 this.singleChair[i]="sold";
 return "You seat is Single Seat No."+i+"\n Enjoy the movie :)";
 else i++;
 while(i<=10);//when i==11 jump out
 return "Sorry, all Single seats have been sold Out";
 public String buyA_Couple_Ticket()
 int i=1;
 do
 if(this.coupleChair[i]!="sold")
 this.coupleChair[i]="sold";
 return "You seat is Couple Seat No."+i+"\n Enjoy the time ;)";
 else i++;
 while(i<=10);//when i==11 jump out
 return "Sorry, all Couple seats have been sold Out";
}//end class
============================
this is the question
A small ABC cinema has just purchased a computer for its new automated reservations system. You have been asked to program the new system. You are to write a Java application to assign seats on each movie show on the day (capacity: 20 seats for 1 movie).
Your program should display the following alternatives: ��Please type 1 for couple seat section�� and ��Please type 2 for normal seat section��. If the user types 1, your program should assign one seat in the couple seat section (seats 1 �C 10). If the person types 2, your program should assign a seat in the normal seat (seats 11 �C 20). Your program should also prompt for the movie time and movie name.
Your program should then display:
I. The person��s seat number
II. Whether it is a couple seat or normal seat of the cinema
III. Time, date, movie name
Your program should never assign a seat that has already been assigned. When the normal seat section is full, your program should ask the person if it is acceptable to be placed in the couple seat section (and vice versa). If yes, make the appropriate seat assignment. If no, print the message ��Next show is in 3 hours time.��
(it is just a small test on my OOM learning, I know it is not necessary to make it so complex.)

Break down your problem into discrete chunks. The more you practice this, the more your initial thoughts will resemble the eventual objects that you will create.
Let's take address a few of your issues:
What has the start time? Is it the ticket or the movie? (Hint: Would someone ever print you out a ticket with a different start time than the movie's?)
If ticket and movie share some attributes, then you can either use inheritance or composition/delegation. In this instance, what makes more sense to you? Is a ticket a movie or vice versa? Or is a ticket simply related to a movie?
If a given object can contain several instances of another object, you will want to use either an array or a collection, probably List in this instance.
Why is there no Theater object? A movie may play at multiple theaters. Each theater has a capacity (in terms of total seats and number already booked). This does not really have anything to do with the movie. It is the Theater that you are booking. It may also have which movies are showing at which time.
Your notion of 'couple' booking seems strange. Why not have a concept like 'consecutive seats required'? That way, your design is more flexible and you can still accomodate couples.That should get you started. Best of luck.
- Saish

How to write the oracle data as XML format. (.XML file)

create or replace procedure pro(p_number )
is
cursor c1 is select *from emp where empno=p_number;
v_file utl_file.file_type;
begin
v_file := utl_file.fopen('dirc','filename.txt','w');
for i in c1 loop
utl_file.put_line(v_file,i.ename || i.empno ||i.job);
end loop;
closef(v_file);
end;
Now my client want instead of .txt file he need .xml files
File should contains xml tags. can any one help regarding this.. with one example.
How to write the oracle data as XML format. (.XML file)

hi,
hope this example will do something....
SQL> select employee_id, first_name, last_name, phone_number
2 from employees where rownum < 6
EMPLOYEE_ID FIRST_NAME LAST_NAME PHONE_NUMBER
100 Steven King 515.123.4567
101 Neena Kochhar 515.123.4568
102 Lex De Haan 515.123.4569
103 Alexander Hunold 590.423.4567
104 Bruce Ernst 590.423.4568
SQL> select dbms_xmlgen.getxml('select employee_id, first_name,
2 last_name, phone_number from employees where rownum < 6') xml
3 from dual;
*<?xml version="1.0"?>*
*<ROWSET>*
*<ROW>*
*<EMPLOYEE_ID>100</EMPLOYEE_ID>*
*<FIRST_NAME>Steven</FIRST_NAME>*
*<LAST_NAME>King</LAST_NAME>*
*<PHONE_NUMBER>515.123.4567</PHONE_NUMBER>*
*</ROW>*
*<ROW>*
*<EMPLOYEE_ID>101</EMPLOYEE_ID>*
*<FIRST_NAME>Neena</FIRST_NAME>*
*<LAST_NAME>Kochhar</LAST_NAME>*
*<PHONE_NUMBER>515.123.4568</PHONE_NUMBER>*
*</ROW>*
*<ROW>*
*<EMPLOYEE_ID>102</EMPLOYEE_ID>*
*<FIRST_NAME>Lex</FIRST_NAME>*
*<LAST_NAME>De Haan</LAST_NAME>*
*<PHONE_NUMBER>515.123.4569</PHONE_NUMBER>*
*</ROW>*
*<ROW>*
*<EMPLOYEE_ID>103</EMPLOYEE_ID>*
*<FIRST_NAME>Alexander</FIRST_NAME>*
*<LAST_NAME>Hunold</LAST_NAME>*
*<PHONE_NUMBER>590.423.4567</PHONE_NUMBER>*
*</ROW>*
*<ROW>*
*<EMPLOYEE_ID>104</EMPLOYEE_ID>*
*<FIRST_NAME>Bruce</FIRST_NAME>*
*<LAST_NAME>Ernst</LAST_NAME>*
*<PHONE_NUMBER>590.423.4568</PHONE_NUMBER>*
*</ROW>*
*</ROWSET>*
ask if you want more assistance.
thanks.

How to write SDO_GEOMETRY using PreparedStatements ?

Hi there,
I use JDBC and JDK 1.3+
Currently I'm writing geometries into Spatial by using Strings and
I meet some limitations for very huge geometries.
That's why I need to use PreparedStatements and parameters to get
rid of this limitation.
My question is how can I write Object types by using JDBC. All
the sample codes I found use oracle.sql and oracle.jdbc packages.
My problem is that my code can be used by people that may not
have an Oracle jdbc driver like "thin" for instance.
thanks for your help,
ALI

Justin,
I have a PL/SQL package that contains several functions. One of them does selection and filtering of spatial features based on a user's location and preferences. For this purpose a web-application runs this function.
I would like this function to do the following:
1. the function is called, user parameters are passed in
2. a call to a java-stored-procedure is made. This java procedure creates a polygon based on the user's location and preferences.
3. the polygon is returned to the PL/SQL function
4. the funtion uses the returned polygon to query spatial features that intersect, etc.
I can do the call to the java-stored-procedure but where I get stuck is how to get the polygon from java to pl/sql. I can return a String or a number from java but how can I return the polygon (e.g., STRUCT, java object)?
The current solution uses a work-around by storing the polygon in a temporary table. I would like to change this because once the function has run, the polygon is not needed anymore so I would like to do without having to store the polygon.
Markus

How to pass value to Multiline container element in workflow ?

Dear Experts,
I am using the BAPI "SAP_WAPI_WRITE_CONTAINER" to write into the workitem container elements. now i want to write the data into a multiline container element. i am unable to do the same. please guide me how to write the data into multiline container.
I am getting the data from portal so i am using the BAPI to populate the container.
Please help me out...
Thanks & Regards
Nigesh

Hi,
Use the following code:
DATA: lv_text             TYPE        string,
          lt_cont_vals        TYPE        swconttab,
          lt_cont_defs        TYPE        swbconttab,
          lo_oref             TYPE REF TO cx_root,
          lo_workitm_cntxt    TYPE REF TO cl_swf_run_workitem_context,
          lo_wi_conv          TYPE REF TO if_swf_cnt_conversion,
          lo_wi_cnt           TYPE REF TO cl_swf_cnt_container,
          lif_wi_cnt          TYPE REF TO if_swf_ifs_parameter_container,
          lo_exception_return TYPE REF TO cx_swf_cnt_container.
***--- Get work Item Context
   TRY.
       CALL METHOD cl_swf_run_workitem_context=>get_instance
         EXPORTING
           im_wiid     = im_wi_id
         RECEIVING
           re_instance = lo_workitm_cntxt.
     CATCH cx_swf_run_wim INTO lo_oref.
       lv_text = lo_oref->get_text( ).
   ENDTRY.
***--- Get Instance of the work Item Container
   CALL METHOD lo_workitm_cntxt->if_wapi_workitem_context~get_wi_container
     RECEIVING
       re_container = lif_wi_cnt.
***--- Type casting work item container into class CL_SWF_CNT_CONTAINRER
   lo_wi_cnt ?= lif_wi_cnt.
***-- Set the value
   TRY.
       lo_wi_cnt->if_swf_cnt_element_access_1~element_set_value(
         EXPORTING
           name             = 'ITEM'
           value            = t_item[]
     CATCH cx_swf_cnt_cont_access_denied.    " Change Access to Container Not Allowed
     CATCH cx_swf_cnt_elem_not_found.    " Element Not Found
     CATCH cx_swf_cnt_elem_access_denied.    " Element Must Not Be Changed
     CATCH cx_swf_cnt_elem_type_conflict.    " Type Conflict Between Value and Current Parameter
     CATCH cx_swf_cnt_unit_type_conflict.    " Type Conflict Between Unit and Current Parameter
     CATCH cx_swf_cnt_elem_def_invalid.    " Element Definition (For Example, Type Name) Is Invalid
     CATCH cx_swf_cnt_invalid_qname.    " Qualified Name Invalid/Already Being Used
     CATCH cx_swf_cnt_container.    " Exception in the Container Service
   ENDTRY.
* VERY IMPORTANT -- Save changes to DB
   TRY.
       lo_wi_cnt->save_to_database( ).
     CATCH cx_swf_cnt_invalid_por.    " Invalid Persistent Object Reference
   ENDTRY.
   lo_workitm_cntxt->publish( ).
   COMMIT WORK AND WAIT.

How to write Select statement for this codition

I need to check whether SGTXT contains BELNR value.
SGTXT is a text field and It should be matched with BELNR
How to write select statement for this.
Select AUGBL AUGDT into t_BSAD
from BSAD
where SGTXT should have the given BELNR Value.
Plz note : Here I cannot give as SGTXT = BELNR as coz BELNR have only 10 digits.

Hi,
data temp(12).
concatenate '%' belnr '%' into temp.
Select AUGBL AUGDT into t_BSAD
from BSAD
where SGTXT like temp.
If belnr is having multiple values,just create a internal table as follows.
types : begin of ty,
        belnr....
        temp(12),
        end of ty.
data itab_ type standard table of ty.
data wa type ty.
loop at itab into wa.
concatenate '%' wa-belnr '%' into wa-temp.
modify itab from wa index sy-tabix transporting temp.
endloop.
Change your select statement accordingly.
Kindly reward poits if it helps.

How to implement a callback function using LabView's Call Library Function Node?

I am trying to call a fuction from a SDK.dll library using the Call Library Function Node. The SDK was provided to
me and I do not have the source code, just the .dll and .h files.
The SdkSetPropertyEventHandler function has a callback fuction as one of its parameters. How do I implement the
callback using the CLF node? I am a good LabView programmer but this is my first time using the Call Library
Function Node. I have read all the info I can find on NI's web site and the discussion board but cannot figure
this one out. I am using LabView 8.6.
The SDK.h deacribes the function as:
// Function:   SdkSetPropertyEventHandler
SdkError SDKAPI SdkSetPropertyEventHandler(
            SdkCameraRef                    inCameraRef,
            SdkPropertyEvent                inEvnet,
            SdkPropertyEventHandler         inPropertyEventHandler,
            SdkVoid*                        inContext );
// Description:
//       Registers a callback function for receiving status
//          change notification events for property states on a camera.
// Parameters:
//       In:    inCameraRef - Designate the camera object.
//              inEvent - Designate one or all events to be supplemented.
//              inPropertyEventHandler - Designate the pointer to the callback
//                      function for receiving property-related camera events.
//              inContext - Designate application information to be passed by
//                      means of the callback function. Any data needed for
//                      your application can be passed.
//      Out:    None
// Returns:    Any of the sdk errors.
A separate header file called SDKTypes.h contains the following data:
typedef SdkUInt32 SdkPropertyEvent;
typedef SdkUInt32 SdkPropertyID;
typedef void       SdkVoid;
typedef struct __SdkObject*    SdkBaseRef;
typedef SdkBaseRef    SdkCameraRef;
SdkPropertyEventHandler
typedef SdkError ( SDKCALLBACK *SdkPropertyEventHandler )(
                    SdkPropertyEvent        inEvent,
                    SdkPropertyID           inPropertyID,
                    SdkUInt32               inParam,
                    SdkVoid *               inContext );
Thanks for your help.
Alejandro
Solved!
Go to Solution.

alejandroandreatta wrote:
I am trying to call a fuction from a SDK.dll library using the Call Library Function Node. The SDK was provided to
me and I do not have the source code, just the .dll and .h files.
The SdkSetPropertyEventHandler function has a callback fuction as one of its parameters. How do I implement the
callback using the CLF node? I am a good LabView programmer but this is my first time using the Call Library
Function Node. I have read all the info I can find on NI's web site and the discussion board but cannot figure
this one out. I am using LabView 8.6.
Basically you do not do that. LabVIEW does not know pointers and certainly not function pointers. What you should do instead is writing a C DLL that implements the callback and also exports a function to be called by LabVIEW that translates between the callback and a LabVIEW user event. Look for PostLVUserEvent() here on the NI site to find examples how to do that.
Rolf Kalbermatter
Message Edited by rolfk on 02-11-2009 08:00 PM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

How to write test case for ViewController project using JUnit ?

Hi All,
JDev ver : 11.1.1.5
JUnit : 1.9 jar added.
I am writing test cases for my ViewController project. View project contains beans and other business logic files.
So, for that I want to write test cases.
In lot of codes I have FacesContext instance, there I am getting null pointer error.
ex:
public static String getFromHeader(String key) {
FacesContext ctx = getFacesContext();
ExternalContext ectx = ctx.getExternalContext();
return ectx.getRequestHeaderMap().get(key);
How to write cases for this scenario ?
I came to know to use mockito, But I dont know how to mock the FacesContext.
Anyone please help.
Thanks,
Gopinath

Gopinath,
Although I've not used it and cannot therefore say anything about whether it's useful or not - have you looked at JSFUnit?
John

How to write a cursor for mutiple columns in forms urgent required.........

i created one table rk with 8 columns and that i designed in forms.
but i have another table grk with 4 columns.
this grk contains data.
this grk 4 columns data i have to retrive in rk table in froms by multiple records.
the both column names are same in the both tables.
because by seeing this 4 columns data i will insert remaining 4 column by entering in rk table in form.
i known that i have to write cursor to retrive the 4 columns data for multiple record from grk table and in trigger i have to produce to rk table.
i have worked but it is not working.
can any body help me out how to write a cursor for 4 column to retrive multple records in form

Hi,
Try,
DECLARE
 CURSOR Cur_Test IS SELECT <field_1>, <field_2>, <field_3>, ... <field_n> FROM <table_name> WHERE <condition>;
BEGIN
 OPEN Cur_Test;
 LOOP
 FETCH Cur_Test INTO <items_or_variables>;
 EXIT WHEN Cur_Test%NOTFOUND;
 END LOOP;
 CLOSE Cur_Test;
END;Regards,
Manu.

How to write c wrapper it containing callback functions

Similar Messages

Maybe you are looking for