Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	unable to obtain context information about the PV
From:	Thomas Schösser <[email protected]>
To:	[email protected]
Date:	Tue, 31 Mar 2015 17:34:35 +0200

Hi All.

For me it's unable to obtain context information about the PV in c++ before a new value is received

Attached:
Please see the record, sourcecode and output below.

Problem:
getDisplayLimitLower() returns 0, while it should return -10.
If I put pv->getDisplayLimitLower() in the (slot-)method it returns the right value.

Question:
How to obtain the DRVH, DRVL, and PREC during setup? Where can I get documentation, how to do this right? Any tutorial available?
How to deal with this problem?

record:
    record(ao, "testdevice1:outCur") {
    field(PREC, "3")
    field(EGU, "A")
    field(DRVH, "10")
    field(DRVL, "-10")
    field(HOPR, "10")
    field(LOPR, "-10")
    }

code:
    Generator::Generator()
    {
        test();
        sendSignal( "2" );
    }

    void Generator::test()
    {
        pv = new QEString( "testdevice1:outCur", this, new QEStringFormatting, 0, new UserMessage );
        pv->subscribe();
        QObject::connect( pv, SIGNAL( stringChanged( const QString&, QCaAlarmInfo&, QCaDateTime&, const unsigned int & ) ), this, SLOT( slotPvStringChanged( const QString& ) ) );
        QObject::connect( this, SIGNAL( signalWritePv( const QString& ) ), pv, SLOT( writeString( const QString& ) ) );
        std::cerr << "LOPR=" << pv->getDisplayLimitLower() << std::endl;
        std::cerr << "HOPR=" << pv->getDisplayLimitUpper() << std::endl;
        std::cerr << "PREC=" << pv->getPrecision() << std::endl;
    }

    void Generator::slotPvStringChanged( const QString& value )
    {
        // here pv->getDisplayLimitLower() returns -10
        std::cerr << "getting " << value.toStdString() << std::endl;
    }

    void Generator::sendSignal( const QString& value )
    {
        emit signalWritePv( value );
    }

output:
    LOPR=0
    HOPR=0
    PREC=0
    getting -3.140 A
    getting -3.140 A

Best regards
Thomas Schösser

-- 

Dipl. Phys.
Thomas Schösser

Raum 110
Institut für Kernphysik
TU Darmstadt
Schloßgartenstraße 9
64289 Darmstadt

Tel.: +49 6151 16 76955

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ANJ, 16 Dec 2015

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System