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<== Date ==> <== Thread ==>
Subject: Re: Basic PVAccess question
From: Marty Kraimer via Tech-talk <[email protected]>
To: [email protected], Michael Davidsaver <[email protected]>
Date: Fri, 1 Mar 2019 06:44:50 -0500 
On 2/27/19 6:27 AM, will.rogers--- via Tech-talk wrote:

I am looking at the exampleCPP repo for EPICS7.


When I run helloRPC I can use pvcall and p4p as a client successfully.


When I run pvDatabaseRPC, I can't use either, and I get the following message:

ChannelRPC not supported


HelloClient.cpp (helloRPC) and positionClient.cpp (pvDatabaseRPC) both use an RPCClient to communicate the server.


I think I don't understand fully. Can anyone clear this up for me?


Cheers,

Will
Will and I had some private messages and now I think I can give an explanation of what we found. pvcall appears to assume that both the client and server use normative type nturi. 
https://github.com/epics-base/normativeTypesCPP/blob/master/src/pv/nturi.h


But neither exampleCPP/helloRPC or exampleCPP/pvDatabaseRPC use nturi.
Will did get helloRPC to work by making the following change to HelloService.cpp 


-    epics::pvData::PVStringPtr nameField = pvArgument->getSubField<PVString>("personsname");
+    std::cout << "Argument " << pvArgument << "\n";
+    epics::pvData::PVStructurePtr queryField = pvArgument->getSubField<PVStructure>("query");
+    epics::pvData::PVStringPtr nameField = queryField->getSubField<PVString>("personsname");



Now I have some questions about pvcall and channelRPC.
Is pvcall meant to replace eget?
Are there plans for future enhancements to channelRPC?
If yes then what is the status?


Marty Kraimer
Replies:
Re: Basic PVAccess question Michael Davidsaver via Tech-talk
References:
Basic PVAccess question will.rogers--- via Tech-talk
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