Replace Sybase callback functions with OCI

Has anybody replaced the Sybase error and message callback functions with the OCI callback capability? If so, I would be interested in discussing any lessons learned that you might have.

Similar Messages

Difficulties replacing some BC functionality with XI (refer to example)

Difficulties replacing some BC functionality with XI (refer to example)
I am transferring all interface processing from BC to XI and am having difficulties replacing some of the current BC functionality. Please refer to my example below
Current process
SAP R/3
SAP R/3 executes an abap that extracts certain data. This data is passed via a remote function which is configured to point to Business Connector
Business Connector
Business Connector takes control and the relevant package does some internal processing then calls the remote enabled function BAPI_ACC_BILLING_POST
SAP R/3
Control is returned to SAP R/3 to post the data and on completion control is returned to Business Connector
Business Connector
Business Connector again takes control where some more processing is done to generate an xml version of the data prior to returning control back to SAP R/3
SAP R/3
Control is returned to the abap immediately following the call to the remote function and processing completes
The initial synchronous call from SAP R/3 to Business Connector remains open whilst Business Connector executes a subsequent synchronous call to SAP R/3.
Finally the initial synchronous call in SAP R/3 completes
Proposed Process
I am transferring all interface processing from BC to XI and am having difficulties replacing some of the current BC functionality. In this instance I can set up the initial synchronous call via an XI Integration Process (sync/async bridge). This allows me to perform subsequent asynchronous calls prior to closing the synchronous bridge
I have successfully performed synchronous calls to SAP R/3 from XI for different scenarios and have set up the XI design and config in the same manner
When I try to perform the synchronous posting back to SAP R/3 from within the SA bridge I get the message Message is incomplete. No Sender found
Unlike BC, it appears that XI does not allow me to perform the synchronous posting back to SAP R/3 from within the SA bridge.
Refer to http://help.sap.com/saphelp_nw04/helpdata/en/83/d2a84028c9e469e10000000a1550b0/frameset.htm for the SAP description To enable the communication between a synchronously calling business system (synchronous outbound interface) and an asynchronously called business system (asynchronous inbound and outbound interface), you can define a sync/async bridge in an integration process. You can only define one sync/async bridge for each integration process.
How can I replace the current BC functionality using XI?
Regards,
Mike

Hi all,
I cannot replicate the current BC functionality in XI
So I will take this opportunity to simplify and improve the design for XI --> R/3
Regards,
Mike

C++: Is it possible using callback function with ncacn_http and rpcproxy server ?

I have a remote procedure and I can call it using http over rpc. I pass trough an rpc proxy server for arriving to my rpc server.
But I cannot call a callback function to my client inside the server function.
Is it possible using callback function with ncacn_http and rpcproxy server ?
We are using IIS on windows server 2008 R2 and the server rpc and the client on the same PC with rpc rpoxy.
If I use ncan_ip_tcp all works fine.
Thanks
Gianluca

Hi,
About the develop question please post to the MSDN forum.
MSDN forum Developer Network
http://social.msdn.microsoft.com/Forums/en-US/home?forum=WAVirtualMachinesVirtualNetwork&filter=alltypes&sort=lastpostdesc
Thanks for your understanding and support.
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Replacing consolkit's function with systemd

The arch wiki says that it is possible to replace consolekit's function with systemd.
https://wiki.archlinux.org/index.php/Sy … r_sessions
Has anyone already done this? I guess there are other packages which have to be recompiled? e.g. gdm and gnome-session, since they depend on consolekit.
As i'm already using systemd i'd like to give it a try, but i'd feel more comfortable with a howto
So if anyone has an idea where to find one, i'd appreciate that.
Regards,
Robert

Aside from changing the type of data you put on the Time Capsule, leave its drive as is. Its format is fixed.
(119920)

Edge Triggered Callback Function with E Series DAQCard

Hardware: DAQCard-AI-16XE-50
Software: NI-DAQ 6.9.1 call from C++
Q- Does anyone have sample code to initiate a callback function in C++ when a pulse edge is input to a DAQCard-AI-16XE-50? I am using ACH1 as the input channel. Pulse edge occurance will be low duty cycle.Below code doesnt work..
(I could use a latch & poll but edge triggering would be cleaner!)
status = Set_DAQ_Device_Info(1,ND_AI_FIFO_INTERRUPTS,
ND_INTERRUPT_EVERY_SAMPLE);
retValue=NIDAQErrorHandler(status,"Set_DAQ_Device_Info (FIFO Interrupts)",0);
status = Set_DAQ_Device_Info(1,ND_DATA_XFER_MODE_AI,
ND_INTERRUPTS);
retValue=NIDAQErrorHandler(status,"Set_DAQ_Device_Info",0);
status = Config_ATrig_Even
t_Message(1,1,"AI1",3,1,1,0,
0,0,0,0,(unsigned int)EdgeCallbackFunction);
retValue=NIDAQErrorHandler(status,"Config_ATrig_Event_Message",0);
Thanks Millions if you help!!

Hi kittyKat,
The easiest way to create an interrupt service routine or callback function triggered on a digital edge is to use DAQ Event Messaging. In C, you can program for your DAQ board by using the function Config_DAQ_Event_Message. The different events you can account for are:
DAQ Event type 0 � Acquire or Generate N Scans
DAQ Event type 1 � Every N Scans
DAQ Event type 2 � Completed Operation or Stopped by Error
DAQ Event type 3 � Voltage out of bounds
DAQ Event type 4 � Voltage within bounds
DAQ Event type 5 � Analog Positive Slope Triggering
DAQ Event type 6 � Analog Negative Slope Triggering
DAQ Event type 7 � Digital Pattern Not Matched
DAQ Event type 8 � Digital Pattern Matched
DAQ Event type 9 � Counter Pulse Event
If you are not
using your analog input on your DAQ board, you can setup an analog input and use your external signal as an external clock. This would involve you using one of the shipping examples for analog input with an external clock and adding the DAQ Event Messaging for Event 1 and have the interval be 1 value. Therefore, your callback function will be called every scan or every time your signal pulses high (as the external clock). I've included some useful resources below.
Using DAQ Event Messaging under Windows NT/95/3.1
http://zone.ni.com/devzone/conceptd.nsf/webmain/159C194435C8CA5786256869005EF6AE?opendocument
DAQ Events and Occurrences
http://digital.ni.com/public.nsf/websearch/9F3DAD3E227E4203862566C2005B11EB?OpenDocument
Hope that helps. Have a good day.
Ron
Applications Engineering
National Instruments

How do I format a Time Capsule (3TB) drive for serving as an external drive while replacing its TC function with a Seagate 4TB drive yet keeping the Apple TC's wifi functionality?

I have a hard line from my iMac to an Apple Time 3 TB Time Capsule with wifi. I wish to replace the drive potion of the Time Capsule with a new Seagate 4TB drive

Aside from changing the type of data you put on the Time Capsule, leave its drive as is. Its format is fixed.
(119920)

ProcessSystemEvents & callback functions

Hello.
I have a question about the ProcessSystemEvents() and callback functions. If I have the following "strange" callback function with the follwoing code inside:
int func(...) {
while(true) {
ProcessSystemEvents();
Could this code create a crash in the underlying run-time lib (cvirte.dll etc), with to many calls to ProcessSystemEvents?
And will this code stop any other callback function from execution, since we are in an infinite while loop?
Best regards,
Christian G.

A fuction like that should be called only once, if this is what you intend. While sitting in the loop, ProcessSystemEvents permits the system to react to events like the user pressing a button or something like this. You must explicitly avoid dangerous events like calling the function again and again, as well as all user actions that can cause problems (like modifying critical parameters while the function is running, improperly exiting the program and so on). To obtain this you may either disable unwanted buttons on the GUI or set a global flag 'system running' tested on all callbacks and functions to protect the system from unwanted operations.
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

Callback functions

can anybody explain callback functions with a simple example

interface Observer {
     void onEvent(int value);
class Worker {
     Observer observer;
     Worker(Observer observer) { this.observer = observer;}
     void doIt() {
          observer.onEvent(1);
}

Queue with callback function not dequeuing

Hi,
I would like to ask you for help or for a hint regarding our problem with the queue:
A trigger is enqueuing to a queue. This works fine, but the callback function is never called. The queue already worked for a while, but since i changed something at the procedure called by the callback it does not work anymore.
I already have tried the following:
-Stopping and restarting
-Dropping and recreating (with the scheduler having no jobs anymore)
-Dropping, restarting the database and recreating
None of these worked. Where do I fail, when considering that the queue with the same scripts worked already? I post the script for creating the queue and adding the subscriber:
CREATE OR REPLACE TYPE pat_history_queue_payload_type AS OBJECT
( TSTAMP VARCHAR2(22 CHAR),
TYP VARCHAR2(10 CHAR),
DELTA_MENGE NUMBER,
ORIGIN VARCHAR2(1 CHAR),
TEXT VARCHAR2(1000 CHAR),
QL_TSTAMP VARCHAR2(22 CHAR)
BEGIN
DBMS_AQADM.CREATE_QUEUE_TABLE (
queue_table => 'pat_history_queue_table',
queue_payload_type => 'pat_history_queue_payload_type',
multiple_consumers => TRUE
END;
BEGIN
DBMS_AQADM.CREATE_QUEUE (
queue_name => 'pat_history_queue',
queue_table => 'pat_history_queue_table',
max_retries => 10
DBMS_AQADM.START_QUEUE (
queue_name => 'pat_history_queue'
END;
BEGIN
DBMS_AQADM.ADD_SUBSCRIBER (
queue_name => 'pat_history_queue',
subscriber => SYS.AQ$_AGENT(
'pat_history_queue_subscriber',
NULL,
NULL )
DBMS_AQ.REGISTER (
SYS.AQ$_REG_INFO_LIST(
SYS.AQ$_REG_INFO(
'pat_history_queue:pat_history_queue_subscriber',
DBMS_AQ.NAMESPACE_AQ,
'plsql://PAT.HISTORY_QUEUE_DISTRIBUTION.CALLBACK',
HEXTORAW('FF')
1
END;
The function CALLBACK which is called by the queue, is never called, I checked that with log messages. Also the package that contains the function is compiled ok.
Thanks.
Roland

Hi,
Does the subscription show up correct in sys.reg$ ?
Regards,
Harry
http://dbaharrison.blogspot.com/

Queue with callback function - strange behaviour when using max_retries

Hi,
I hope someone can tell me what is wrong or can explain the following strange behaviour to me.
I am using one queue with a registered callback function. To test the behavoiur in case of an error I tested different settings, with or without explicit exception queue and with or without parameter max_retries.
Database Version is 11.2.0.2.   Enterprise Edition
I enqueue 10 messages in a loop.
I define no exception queue and do not set max_retries
==> all messages stay in the queuetable with q_name = AQ$_... (implicit exception queue) and retry_count = 5
I define no exception queue and set max_retries = 4
==> 1 message stays in the queuetable with q_name = AQ$_... (implicit exception queue) and retry_count = 4
       9 messages stay in the queuetable with q_name = nomal queue name and retry_count = 0
I define an exception queue and set max_retries = 4
==> 1 message is transfered to the Exception Queuetable with retry_count = 4
       9 messages stay in the normal Queuetable and retry_count = 0
I define an exception queue and do not set max_retries
==> all 10 messages are transferred to the Exception Queuetable with retry_count = 5
I have no explanation for the behaviour in case 2 and case 3.
To create the queue and the callback I use this code (reduced to minimum):
begin
   DBMS_AQADM.CREATE_QUEUE_TABLE(Queue_table        => 'TESTUSER.TEST_TABELLE'
                               , Queue_payload_type => 'SYS.AQ$_JMS_TEXT_MESSAGE'
                               , sort_list          => 'enq_time'
                               , multiple_consumers => FALSE
   DBMS_AQADM.CREATE_QUEUE( queue_name => 'TESTUSER.TEST_QUEUE'
                          , queue_table => 'TESTUSER.TEST_TABELLE'
--                          , max_retries => 4                     uncomment this line to set max_retries
-- uncomment the following Block to use an explicit Exception Queue
/*   DBMS_AQADM.CREATE_QUEUE_TABLE(Queue_table        => 'TESTUSER.TEST_TABELLE_EXC'
                               , Queue_payload_type => 'SYS.AQ$_JMS_TEXT_MESSAGE'
                               , sort_list          => 'enq_time'
                               , multiple_consumers => FALSE
   DBMS_AQADM.CREATE_QUEUE( queue_name => 'TESTUSER.TEST_QUEUE_EXC'
                          , queue_table => 'TESTUSER.TEST_TABELLE_EXC'
                          , queue_type => dbms_aqadm.EXCEPTION_QUEUE);
   DBMS_AQADM.START_QUEUE('TESTUSER.TEST_QUEUE');
end;
create or replace procedure test_procedure
(context RAW
,reginfo sys.AQ$_reg_info
,descr    sys.AQ$_descriptor
,payload VARCHAR2
,payloadl NUMBER
) authid definer
IS
-- für Queue
dequeue_options   DBMS_AQ.dequeue_options_t;
message_prop      DBMS_AQ.message_properties_t;
message_hdl       raw(16);
message           sys.aq$_jms_text_message;
l_daten           VARCHAR2(32767);
ex_hugo          EXCEPTION;
BEGIN
    dequeue_options.msgid         := descr.msg_id;
    dequeue_options.consumer_name := descr.consumer_name;
    dbms_aq.dequeue(descr.queue_name, dequeue_options, message_prop, message, message_hdl);
    -- to provoke an error
    RAISE ex_hugo;
    -- regurlar coding
    commit;
exception
when others then
       rollback;
       RAISE;
end;
DECLARE
   reginfo1    sys.aq$_reg_info;
   reginfolist sys.aq$_reg_info_list;
BEGIN
   reginfo1 := sys.aq$_reg_info('TESTUSER.TEST_QUEUE', DBMS_AQ.NAMESPACE_AQ, 'plsql://TESTUSER.TEST_PROCEDURE?PR=0',HEXTORAW('FF'));
   reginfolist := sys.aq$_reg_info_list(reginfo1);
   sys.dbms_aq.register(reginfolist, 1);
   commit;
END;
to enqueue my messages i use:
DECLARE
message            sys.aq$_jms_text_message;
enqueue_options    dbms_aq.enqueue_options_t;
message_properties dbms_aq.message_properties_t;
msgid              raw(16);
v_daten            clob;
BEGIN
   message := sys.aq$_jms_text_message.construct;
   for i in 1..10
   loop
      v_daten := '{ dummy_text }';
      message.set_text(v_daten);
-- uncomment the following line to use an explicit Exception Queue
--      message_properties.exception_queue := 'TESTUSER.TEST_QUEUE_EXC';
      dbms_aq.enqueue(queue_name         => 'TESTUSER.TEST_QUEUE',
                      enqueue_options    => enqueue_options,
                      message_properties => message_properties,
                      payload            => message,
                      msgid              => msgid);
      message.clear_properties();
   end loop;
   commit;
END;

Hi Chris,
I tried to reproduce your complaint, but was unable to. I didnt use auditting however, just a series of "select user from dual" with proxy authentication. You might want to see if you can put together a small complete testcase for this and open a sr with support.
Cheers
Greg

Need help in using replace function with special characters

I have a column in a table where the data can contain ascii code for special characters such as an apostrophe.
The data looks like this:
CREEK'S LANE
ie for a street named CREEK'S LANE.
I want to replace the ascii representation with the apostrophe and have the returned data show up as: CREEK's LANE
When I try the query below I get prompted for substitution variable value.
I don't seem to be able to find the right syntax to make this query work.
SELECT REPLACE (street_name, ''', '''')
FROM
streets WHERE street_id = 1
Does anybody know how to do this?
Any help would be much appreciated.
Thanks.
George

george91 wrote:
I have a column in a table where the data can contain ascii code for special characters such as an apostrophe.
The data looks like this:
CREEK'S LANE
ie for a street named CREEK'S LANE.
I want to replace the ascii representation with the apostrophe and have the returned data show up as: CREEK's LANE
When I try the query below I get prompted for substitution variable value.
I don't seem to be able to find the right syntax to make this query work.
SELECT REPLACE (street_name, ''', '''')
FROM
streets WHERE street_id = 1
Does anybody know how to do this?
Any help would be much appreciated.
Thanks.
GeorgeHa! The codes you specified rendered in the HTML, but showed properly when I listed your original posting above. I didn't understand what you meant initially because the 5-character string represenation got rendered as the quote that you said you weren't able to get - a display problem.
You're getting prompted for the substituon variable because of the ampersand; you appear to be doing this in SQL*PLUS. The first thing I would try is to SET DEFINE OFF when using the ampersands to see if that works. If That doesn't work check the docs to delmit the ampersand (I think its a backslash before it but can't remember offhand). Another, harder option might be to use the TRANSLATE function replacing the literal character instead of using REPLACE (though replacing a quote will be a little tricky). If you're on 10g also consider using the advanced quoting
Good luck!
Edited by: riedelme on May 22, 2009 12:45 PM

Memory leak with callback function

Hi,
I am fairly new to LabWindows and the ninetv library, i have mostly been working with LabVIEW.
I am trying to create a basic (no GUI) c++ client that sets up subscriptions to several network variables publishing DAQ data from a PXI.
The data for each variable is sent in a cluster and contains various datatypes along with a large int16 2D array for the data acquired(average array size is 100k in total, and the average time between data sent is 10ms). I have on average 10 of these DAQ variables.
I am passing the same callback function as an arguement to all of these subscriptions(CNVCreateSubcription).
It reads all the correct data, but i have one problem which is that i am experiencing a memory leak in the callback function that i pass to the CNVCreateSubscription.
I have reduced the code one by one line and found the function that actually causes the memory leak, which is a CNVGetStructFields(). At this point in the program the data has still not been passed to the clients variables.
This is a simplified version of the callback function, where i just unpack the cluster and get the data (only showing from one field in the cluster in the example, also not showing the decleration).
The function is passed into to the subscribe function, like so:
static void CNVCALLBACK SubscriberCallback(void * handle, CNVData data, void * callbackData);
CNVCreateSubscriber (url.c_str(), SubscriberCallback, NULL, 0, CNVWaitForever, 0 , &subscriber);
static void CNVCALLBACK SubscriberCallback(void * handle, CNVData data, void * callbackData)
int16_t daqValue[100000];
long unsigned int nDims;
long unsigned int daqDims[2];
CNVData fields[1];
CNVDataType type;
unsigned short int numFields;
CNVGetDataType(data, &type, &nDims);
CNVGetNumberOfStructFields (data, &numFields);
CNVGetStructFields (data, fields, numFields); // <-------HERE IS THE PROBLEM, i can comment out the code after this point and it still causes a memory leak.
CNVGetDataType(fields[0], &type, &nDims);
CNVGetArrayDataDimensions(fields[0], nDims, acqDims);
CNVGetArrayDataValue(fields[0], type, daqValue, daqDims[0]*daqDims[1]);
CNVDisposeData(data);
At the average settings i use all my systems memory (4GB) within one hour.
My question is, have any else experienced this and what could the problem/solution to this be?
Thanks.
Solved!
Go to Solution.

Of course.....if it is something i hate more than mistakes, it is obvious mistakes.
Thank you for pointing it out, now everything works

Need an example how to use SCAN_Start with a callback function

I would appreciate if someone helps me with a working example of how to use SCAN_Start with a callback function. I need just a basic functionality: to specify a channel list (with gains probably), to start a data acquisition task and to receive data buffers utilizing a callback function. t this time whatever I was trying to do caused computer hangups, though it is supposed to be one of the most regular tasks to perform.
Thank you in advance,
Mike

Hello Mike,
Thank you for contacting National Instruments.
Attached is an example project which uses a callback function to begin analog acquisition (AI) by calling SCAN_Start. This project acquires from the first 2 channels on your DAQ device. Make sure to modify the device number in the code to match the number of your card.
Let me know if you have any further questions...
Sincerely,
Sean C.
Applcications Engineer
National Instruments
Attachments:
Acquire_multichannel_61xx.zip ‏11 KB

External Function with a Pointer to a Callback Function Inside a DLL

Hi.
I'm loading a DLL and trying to call a function with the following prototype:
Func1(HANDLE, hHandle, LPVOID (*pCallback)(UINT, UINT LPVOID), CHAR* sPath)
Now, I have no problem with the variable types, because CVI 9.0.1 recognizes all of them and I have no problem with LoadLibrary() nor with GetProcAddress().
But, how do I pass a pointer to a callback that is inside the DLL I'm trying to use.
I've tried to declare the callback like this:
LPVOID (CALLBACK Callback)(UINT iDevNo, UINT evEvent, LPVOID pData);
and call the function Func1 like this:
(Func1)(hHandle, &Callback, NULL);
but this gets me:
Undefined symbol '_Callback@12' referenced in "source.c".
Hope I can get some help.
I appreciate your time on this issue.
Regards.
Daniel Coelho
VISToolkit - http://www.vistoolkit.com - Your Real Virtual Instrument Solution
Controlar - Electronica Industrial e Sistemas, Lda
Solved!
Go to Solution.

Hi Daniel,
First, you have to make sure that the callback function is exported by the DLL, so that the program that uses the DLL can access the function name identifier. Then, you have to make sure that you call GetProcAddress not just on Func1, but also on the exported callback function. You need to store both function address values in their respective function pointers. You then can pass the callback function pointer as an argument to the Func1 call.
It's probably cleaner if you define typedefs for all your function pointers, in the calling program:
typedef LPVOID (__stdcall *CallbackType) (UINT , UINT, LPVOID);
typedef ??? (__stdcall *Func1Type) (HANDLE, hHandle, CallbackType, CHAR*);
CallbackType CallbackPtr;
Func1Type Func1Ptr;
dllHandle = LoadLibrary ("...");
CallbackPtr = (CallbackType)GetProcAddress (dllHandle, "Callback");
Func1Ptr = (Func1Type)GetProcAddress (dllHandle, "Func1");
Func1Ptr (..., hHandle, CallbackPtr, NULL);
Boa Sorte!
Luis

How to make customize Replace function with Positions not pattern ?

Hi
Due to Repalce with patterns in flex, i am facing issue.
I want to make cutomize replace function with parameters
1 Parameter - String to replace
2 Parameter - Start Posion.
3 Parameter - Last position
which return string value.
For Example
replaceInWholeString(str:String, sPos:Number, lPos:Number ):String
values like
1st paramter - "asked"
2nd Paramter - 11
3rd Paramter - 15
Original String :: I want to reply
Output string : I want to asked
Please Reply ,if someone having solution
Thanks
Sunil Rana

You can use any number of the String methods to acomplish this.
I would proabably go with something like: slice(...) + input + substr(...);

Replace Sybase callback functions with OCI

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