Experimental Physics and
Industrial Control System

Hi Anton,

 

You must be using a very old version of EPICS V4. I think 4.3 was the last release to have that API, so if that’s the case you may have to look out for a few other changes (pva network protocol changed between 4.3. and 4.4).

 

To create a pvRequest you just supply the request string – there’s no need to supply a requester. createRequest() simply takes the string and returns the corresponding PVStructure.

 

Note since 4.3 CreateRequest has moved from pvAccess to pvData and the singleton instance getCreateRequest() has been replace by a static create().

 

So

 

pvRequestP = getCreateRequest()->createRequest(request, requesterP);

 

becomes

 

pvRequestP = CreateRequest::create()->createRequest(request);

 

If the createRequest was the only reason for creating the requesters then you won’t need them anymore.

 

Note that createRequest throws std::logic_exceptions with helpful messages if something goes wrong.

 

Hope that helps,

 

Dave

 

 

Hi,

 

In a previous version of EPICS4 I had to use the following code at initialization

 

    Requester::shared_pointer requesterP(new RequesterImpl("pvput"));

    Requester::shared_pointer requesterG(new RequesterImpl("pvget"));

 

    pvRequestG = getCreateRequest()->createRequest(request, requesterG);

    if(pvRequestG.get()==NULL) printf("failed to parse request string\n");

 

    pvRequestP = getCreateRequest()->createRequest(request, requesterP);

    if(pvRequestP.get()==NULL) printf("failed to parse request string\n");

 

However in the latest version createRequest only takes one argument. How to do it now?

 

Best regards

 

Anton