RE: Help developing AD plugin

[Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>]

Hi Marco,

 

Since you passed copyArray=false to endProcessCallbacks then it appears to me that the pArray you passed to that function must be NULL.

 

You should check the status return of NDArrayPool->copy() and you should print the value of the pOutput pointer returned from that function using the %p format.

 

Mark

 

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Marco A. Barra Montevechi Filho via Tech-talk
Sent: Wednesday, August 16, 2023 3:39 PM
To: tech-talk at aps.anl.gov
Cc: SWC <swc at lnls.br>
Subject: Help developing AD plugin

 

Hi all, we are developing a geometric restoration plugin here at Sirius for areaDetector

Im using NDWarp as a base just because it seems to work as a good example. Also, im unfortunately bound to EPICS 3.15.6, AreaDetector R3-7.

Taking NDWarp as a base, i basically stripped everything between NDPluginWarp::processCallbacks and NDPluginWarp::endProcessCallbacks, so the code is what i append at the end of this e-mail: it should only copy the original array that comes to it and pass it to the other connected plugins.

By compiling and running an IOC with this plugin, when i enable its callbacks i get the following message in my ioc shell:

2023/08/16 17:29:51.666 NDPluginDriver::endProcessCallbacks: Couldn't allocate output array. Further processing terminated.

Although i tried reading the source code, using gdb and recompiling ADCore by adding -g to USR_CXXFLAGS_Linux ad stepping into each function, etc. etc. i couldnt figure out what am i doing wrong. Am i passing a NULL array to  NDPluginDriver::endProcessCallbacks?

Are there any hints about this?

Thanks in advance,

Marco


CODE PART:

NDPluginWarp::processCallbacks(NDArray *pArray)

{

    // pArray is borrowed reference.  Caller will release()

 

    NDPluginDriver::beginProcessCallbacks(pArray);

 

    NDArrayInfo info;

    NDArray *pOutput;

    (void)pArray->getInfo(&info);

 

    if(pArray->ndims!=2 || info.xSize==0 || info.ySize==0) {

        asynPrint(pasynUserSelf, ASYN_TRACE_ERROR,

                  "%s:: 2D non-empty expected",

                  this->portName);

        return;

    }

    switch(pArray->dataType) {

    case NDInt8:

    case NDUInt8:

    case NDInt16:

    case NDUInt16:

    case NDInt32:

    case NDUInt32:

    case NDFloat32:

    case NDFloat64:

        break;

    default:

        asynPrint(pasynUserSelf, ASYN_TRACE_ERROR,

                  "%s:: Unsupported type %u",

                  this->portName, (unsigned)pArray->dataType);

        return;

    }

    asynPrint(pasynUserSelf, ASYN_TRACE_FLOW, "%s: %s ndarray=%p\n", this->portName, __PRETTY_FUNCTION__, pArray);

 

    printf("a\n");

    this->pNDArrayPool->copy(pArray, pOutput, true, true, true);

    NDPluginDriver::endProcessCallbacks(pOutput, false, true);

}

 

Aviso Legal: Esta mensagem e seus anexos podem conter informações confidenciais e/ou de uso restrito. Observe atentamente seu conteúdo e considere eventual consulta ao remetente antes de copiá-la, divulgá-la ou distribuí-la. Se você recebeu esta mensagem por engano, por favor avise o remetente e apague-a imediatamente.

Disclaimer: This email and its attachments may contain confidential and/or privileged information. Observe its content carefully and consider possible querying to the sender before copying, disclosing or distributing it. If you have received this email by mistake, please notify the sender and delete it immediately.