IPhone 5 callback function

When try to use callback function, it's not working well.
I'm expecting to hear ring tone when successful re-dial but now is listening to my own voice.
It's seem in the background process is dialling but the audio is not link to the dial tone and just listen to my own mic/voice.
I got to hang up and wait the other party to call me.

When the call fails (interrupts or even don't connect) the phone suggests you to "call back" or cancel.
When you click "call back", it shows you the connection screen saying "calling" but if you put the phone to your ear, you'll hear your own voice instead if tones. It's like my mic is on and i hear it in my speaker/headphone.
It's not about carrier since it have never happened on any other phone.
Anyway, they always say "change your phone".
If i press "cancel" instead of "call back" and dial the number as usual, via contacts say, everything is fine. So the problem appears only when using "call back"

Similar Messages

IPhone SDK: Breakpoints don't trigger in a Callback function

Hi -
I coded a callback function for a CFSocket object; I followed the steps outlined by the CFSocket reference page. Everything seems fine, and then I enable a breakpoint inside my callback function.
I run my code, and gdb does not stop into my callback.
There doesn't seem to be much infos online about this particular problem. Can anyone tell me what I'm doing wrong?
Thanks, Charles.

Have you used logging to verify that the callback is being entered?

How to create a callback function module

Hi all,
I am working in a requirement where we need to call a function module at a 'after change' event. So how to create a callback function module and register it with the crmvevent ?_
I created a sample function module and try to create entries in table crmv_event_cust, but i got an error message saying that the function module name I provided is not in table CRMC_FUNC_ASSIGN. When I try to create entry there, I got a message that function module is not in CRMC_OBJ_FUNC and that table is a standard table with no maintanance options !!
looks like i am going in wrong way ... can any one please help ??

Looking at my system all you need to do is create the entry for the callback function in maint view: CRMV_FUNC_ASSIGN.
Your entry should be as simple as Z-function name Object Function - <same as others in the segment you are assigning>
IE for the partner it would be CRM_PARTNER as object function, for general order processing CRM_ORDER
Take care,
Stephen

Calling a method from a callback function under ARC

Hi All
I previously wrote some HIDManager software. The HIDManager references were done in a Objective C class so within this object you have the code:
    IOHIDManagerRegisterDeviceMatchingCallback( k8055HIDManager, k8055BoardWasAdded, (__bridge void*)self );
Which registers with the HIDManager
The Callback function which is outside the class was as follows:
static void k8055BoardWasAdded(void* inContext, IOReturn inResult, void* inSender, IOHIDDeviceRef k8055HIDDevice)
    IOHIDDeviceOpen(k8055HIDDevice, kIOHIDOptionsTypeNone);
    CCVellemanK8055Driver * k8055 = (__bridge CCVellemanK8055Driver *)inContext;
    [k8055 setHardwareConnectionStatus : YES];
Any how my problem is in converting the code to ARC as under OS X 10.9 SDK and 64bit I'm now getting a EXC_BAD_ACCESS (Code=EXC_I386_GPFLT) at this line
    CCVellemanK8055Driver * k8055 = (__bridge CCVellemanK8055Driver *)inContext;
although removing the method
[k8055 setHardwareConnectionStatus : YES];
will alow it to build but then obviously the app won't work as required.
Could someone suggest a ARC safe way of accessing the passed instance so I can again call methods on it.
Cheers
Steve

Try using blocks instead. This is the callback I am using for libcurl.
static size_t callback(
void * contents, size_t size, size_t nmemb, void * context)
size_t (^block)(void *, size_t) =
    (__bridge size_t (^)(void *, size_t))context;
size_t result = block(contents, size * nmemb);
return result;

How to change the Callback function of a GUI button?

I would like to change the callback function associated with a GUI button dynamically in the programming way.
Here is the code piece I tried, but it does not seem to work:
const char* pstrLabelSaveJpeg = "SaveJpegCb";
SetCtrlAttribute(pahel_id, ctrl_id ,ATTR_LABEL_TEXT, pstrLabelSaveJpeg);
int CVICALLBACK SaveJpegCb(int panel, int control, int event, void *callbackData, int eventData1, int eventData2);
Solved!
Go to Solution.

The attribute you used is about the "label" of the button.
It is just an appearence attribute. You can write your own name on it, but that does not change the callback function.
You should change the ATTR_CALLBACK_FUNCTION_POINTER attribute, and you should not pass the function name as a string.
So your function call will look like this:
SetCtrlAttribute(pahel_id, ctrl_id, ATTR_CALLBACK_FUNCTION_POINTER, SaveJpegCb);
Of course, you have to declare the SaveJpegCb function somewhere above that line.
I think you have already done that.
S. Eren BALCI
www.aselsan.com.tr

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/

TCP Callback function passing data to teststand

Hi,
I'm trying to pass data via a TCP Callback function to teststand using the TCP steptype that I downloaded from Ni.
When I open a connection, container data is passed to the dll on which it creates a connection, the dll in part creates a TCP Callback function.
The handle obtained from the connection is then passed back through the container data, and the dll returns back to the sequence editor which will execute the next steps.
The problem is that when the TCP Callback function gets an TCP_READY event it can not pass data to TestStand because it can not access the container data.
How can this TCP Callback function pass/alter data to/in Testand?
Thank you...

Yes ThiCop,
That's exactly what I want to establish!
Here is the example code:
//Function needed by the TCP functions
int CVICALLBACK MsgHandler (unsigned handle, int event, int error, void *callbackData)
    char receiveBuf[256] = {0};
    char displayBuf[7] = {0};
    char * tempLookup;
    int dataSize = sizeof (receiveBuf) - 1;
   switch (event)
      case TCP_CONNECT:
         break;
      case TCP_DISCONNECT:
         break;
     case TCP_DATAREADY:
         if ((dataSize = ClientTCPRead (handle, receiveBuf, dataSize, 1000)) > 0)
               // Send data from receiveBuf to a variable in teststand ????
               //  TS_PropertyGetValString (HandleObject, NULL, "Step.Result.Data", 0, &tempLookup);
               //  TS_PropertySetValString (HandleObject, NULL, tempLookup, 0, receiveBuf);
         else
               receiveBuf[dataSize] = '\0';
        break;
return 0;
void __declspec(dllexport) TX_TEST TCPConnectF(tTestData * testData, tTestError * testError)
    int                 error = 0;
    int                 TCPerror;
    double           Port;
    double           Timeout;
    char              *HandleLookup;
    char              *ServerAdd;
    char              *CallbackData;
    ErrMsg           errMsg = {'\0'};
    ERRORINFO   errorInfo;
    tsErrChk (TS_PropertyGetValString (testData->seqContextCVI, &errorInfo, "Step.Result.Handle", 0, &HandleLookup));
    tsErrChk (TS_PropertyGetValNumber (testData->seqContextCVI, &errorInfo, "Step.Result.Port", 0, &Port));
    tsErrChk (TS_PropertyGetValString (testData->seqContextCVI, &errorInfo, "Step.Result.IP", 0, &ServerAdd));
   tsErrChk (TS_PropertyGetValNumber (testData->seqContextCVI, &errorInfo, "Step.Result.Timeout", 0, &Timeout));
   tsErrChk (TS_PropertyGetValString (testData->seqContextCVI, &errorInfo, "Step.Result.Data", 0, &CallbackData));
    TCPerror = ConnectToTCPServer (((unsigned int *) &ConnectionHandle), ((unsigned int) Port), ServerAdd, MsgHandler, 0, Timeout);
    if (TCPerror != 0)
    //Get TCP Error Message
       sprintf(errMsg,"%s",GetTCPErrorString ( TCPerror ));
       error = TCPerror;
       goto Error;
tsErrChk (TS_PropertySetValNumber (testData->seqContextCVI, &errorInfo, HandleLookup, 0, ((double) ConnectionHandle)));
Error:
    // FREE RESOURCES
    CA_FreeMemory(HandleLookup);
    CA_FreeMemory(ServerAdd);
    // If an error occurred, set the error flag to cause a run-time error in TestStand.
    if (error < 0)
        testError->errorFlag = TRUE;
        testError->errorCode = error;
        testData->replaceStringFuncPtr(&testError->errorMessage, errMsg);
    return;

MIDI in using DLL callback function

I am trying to get MIDI into LV. The dll used is winmm.dll and the function midiinopen (plus others) is described here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/htm/_win32_midiinopen.asp
The main problem is I don't know how to program the Call Library Function Node properly in order to perform the call
plus set it to start receiving callback data, being midi messages. I have tried creating and registering a User Event and
passing the Event ref to the dll's "dwCallback" and then trapping the callback in an Event Structure, but nothing happens.
I have studied the "Communicating with a Windows MIDI Device in LabVIEW" example but it gives no hint since midi out
does not require the use of callbacks.
Please advice,
Stefan

Vedeja wrote:
I am trying to get MIDI into LV. The dll used is winmm.dll and the function midiinopen (plus others) is described here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/htm/_win32_midiinopen.asp
The main problem is I don't know how to program the Call Library Function Node properly in order to perform the call
plus set it to start receiving callback data, being midi messages. I have tried creating and registering a User Event and
passing the Event ref to the dll's "dwCallback" and then trapping the callback in an Event Structure, but nothing happens.
Damn! Need to make this post shorter as this message
board just silently told me that it needs to be shorter than 5000 words
and ate up my lengthy repsonse with no way to get it back.
You can't configure a Call Library Node to pass a Callback function to
another function. Callback functions have been alien to LabVIEW for a
long time with good reasons and what it has now as callback function in
LabVIEw 7.1 and newer is not directly compatible with C callback
functions.
Basically as you want to get data from the callback function back into
LabVIEW there is really no way around some intermediate software layer
which in this case almost surely means your own specific wrapper DLL
written in C.
If you use LabVIEW 7.1 you could use user events but not in the way you
describe. Attached is an example of how you can use user events from
external code. Note the extra DLL you will have to write. You have to
watch out what data you pass back to the user event as it has to match
exactly the type you configured the user event for, otherwise LabVIEW
will simply crash on you.
For numerics this is quite simply and also shown in the example. For
strings you can't just pass back a C string pointer but you will have
to allocate a LabVIEW string handle with
handle = DSNewHandle(sizeof(int32) + <length of C string>)
and then copy the C string into it. For specifics about how to do this
you should refer to the External Code reference manual in your Online
Bookshelf. Similar rules apply for arrays or clusters for that matter.
If you want or need to do this for LabVIEW < 7.1 there are two
possible approaches but both are even less trivial. You could either
create a wrapper DLL that translates your callback events into LabVIEW
occurrences and for the data transfer back to LabVIEW you would have to
implement your own queing too, or you could use the Windows Message
Queue example somewhere here in the NI examples and adapt it to return
your specific data. That would solve the data queueing more or less for
you without having to worry about that.
Rolf Kalbermatter
Message Edited by rolfk on 05-22-2006 11:22 AM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions
Attachments:
userevent.zip ‏27 KB

JNI Multithreading/Callback Function Design Issues

Ok, I have been working on this for quite some time now and I simply can not figure it out. So any ideas are more than welcome. :)
I have Java code that uses a DLL that I created in C++. My C++ code links with a library made by a 3rd party (don't have access to the source or anything). The 3rd party's code creates a new thread and calls a callback function that I define in my C++ code. This callback is called continuously until I perform some other code to stop it. Now for the tricky part. In my callback function I need to pass some data back in Java. Here is where my design falls apart. Since the callback function is technically part of the 3rd party's thread, I have to call AttachCurrentThread() in the callback to get the JNIEnv pointer in order to ultimately call my desired Java method. The problem is that my Java method (or even the C++ callback function) are only invoked if I do a sleep() in my C++ code after I start the 3rd party code which creates the thread. If I do a Thread.sleep() in Java after I call the native function code, it just sleeps and the callbacks never get called. It appears as though the thread dies as soon as I return from my C++ code.
So now I am stuck. I have tried creating a thread in Java which simply calls the C++ code and the C++ code just loops waiting for an updated flag, however, this causes the 3rd party's thread creation code to fail (not quite sure why). However, even if their code worked, I'm not convinced this is even proper design. I apologize if this is simply a threading design principle as my multithreading programming techniques are a bit rusty and I've never done a multithreaded application this complex (this is a simplified version, but the idea is the same).
I welcome any suggestions or even documentation that may lead me in the right direction. Thanks in advance.

I have a similar issue.
from java I call a dll I wrote, which calls a third party scanner dll (cyber.dll). Everything works ok, except, when an event in the scanner occurs, it calls the call backin my dll, which calls the callback in java, which kills the vm with an access violation. If I execute the call back to java from a c method which I just called from java, it works, but if it gets called outside of the java execution of the native code, it fails.
I havent done anything with treads or syncronisation. Do I need to do this AttachCurrentThread stuff? If so, where do I get the _jvm handle as Im not starting the vm from c?

Callback functionality in Web dynpro

Dear Experts,
How i can implement a web dynpro application which gets updates from server without any interaction from the end user? in the same time I dont want to trigger a full refresh using timed trigger as this will slow the application. is there any functionality like Ajax partial refresh or callback functionality?
Best Regards
ebrahime

>
ebrahime wrote:
> Dear Experts,
> How i can implement a web dynpro application which gets updates from server without any interaction from the end user? in the same time I dont want to trigger a full refresh using timed trigger as this will slow the application. is there any functionality like Ajax partial refresh or callback functionality?
>
> Best Regards
> ebrahime
If you want to update with ajax a web dynpro application, you can not do this In CE 7.1 or earlier (I really don't know about 7.11). You can do this for example with a portal application, if it isn't something specific for the wd application you can move it outside and place it somewhere with your wd application, some playing with the pages will do this work.
You can do another thing: place a portal application, which will be invisible and will call some web service via ajax and use portal eventing to "inform" your we dynpro application. But in this case when you receive the event it will behave like the timer trigger, it will redraw you page.

In VB6, why is the "GPIBNotify sub" (from the GPIBNotify AtiveX Ctrl) all the time called even if no Event happened? This callback function is started then stopped permanently as if its received SRQ from the GPIB Bus. Any ideas?

I'm programming in Visual Basic 6 to communicate between a computer and HP Measurement Devices (BER-Meter) with GPIB. I have already read information and code for this. My platform is W98. The NI488.2 commands can be sent without any problem between the equipements. However when I'm using the GPIBNotify ActiveX Control to use the callback function, there is a permanent starting and stop of the GpibNotify Sub. The SetupMask and RearmMask are set to RQS and the HP Device is well configured. Moreover an oscilloscope measuring the 10th line (SRQ
) of the bus didn't show any pulse on the line behalf the right one. Any Idea?

Hello-
So, the SRQ is not detected by the oscilloscope? It must be a setting that is not correct with the instrument. Try contacting the manufacturer of the instrument for details about SRQ's. The GPIBNotify ocx will not be able to react to an SRQ if there isn't one.
Randy Solomonson
Application Engineer
National Instruments

Import dll callback function

Having trouble with this line "void (*m_callback)(_t_pciCommand *cmd);" in PciApi.h file. I have replaced it with NULL and was able to import 2 functions, PciAllocCommand and PciSendCommand. I was then able to get valid information using GetValueByPointer.VI, but crash most of the time.
typedef struct _t_pciCommand
                t_pciCommandType                      m_command;
                t_commandError                          m_error;
                long                                               m_gpVal;
                void                                                (*m_callback)(_t_pciCommand *cmd);
                long                                              m_param[MAX_PCI_PARAMS];
                int                                               m_state;
                int                                               m_retries;
                int                                               m_expected;
                long                                            m_origParam[MAX_PCI_PARAMS];
} t_pciCommand;
All files attached. Based on this callback funtion, I can't seem to resolve 2 functions, called PciAllocCommand and PciSendCommand.
Thanks,
John
Solved!
Go to Solution.
Attachments:
PciApiDll7.zip ‏630 KB

The manual is "pci_api_manual_jb.doc", The funtion I care most about is PciAllocCommand and the #1 issue I have is how to pass "m_param[0]" , "m_param[1]" and "m_param[2]" to the dll. The original h file is "PciApp(original).h" . The second issue would be if removing the callback functionality I need a VI to poll the status of "t_PciCommand "Function without writing to it.
For example, PciAllocCommand(c_baudrate, NULL, 0). How do I set baud = m_param[0]?
Also I am adding a TestApp.exe example of what I want to do in Labview, focusing on the Param1 and Param2
Attachments:
PciApiDll7.zip ‏630 KB
TestApp.zip ‏67 KB

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

Register a Callback function in LabVIEW

Is there any way to register a callback function in LabVIEW. For example:
I have a DLL on Win2k that run a thread. This thread is doing a certain task (it is not important what it does...) I can't predict when this task will end and I need to know when the task is over. The easy way would be to poll this DLL and ask: "Is it over? Is it over?" over and over again. No! I don't want to poll. Not because it's too easy. I want this DLL to wake me up on time.
Any idea, solutions, function that I'm not aware of, new features...
Thanks
Nitrof

I think I have a much better solution for you. Here is an example program that show how to set a LabVIEW occurence in a dll. Therefore when your dll is done it can set the LabVIEW occurence, meanwhile your VI is just waiting on the occurence.
More infomration on this is in the external code in LabVIEW manual Using External Code in LabVIEW
NOTE:This will ONLY work in LabVIEW 7.
Attachments:
SetOccurDll.zip ‏165 KB

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

IPhone 5 callback function

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