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79 lines
3.0 KiB
C
79 lines
3.0 KiB
C
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/***************************************************************************
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rlopcxmlda.h - description
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-------------------
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begin : Mon Aug 27 2007
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copyright : (C) 2007 by pvbrowser
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email : lehrig@t-online.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE as *
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* published by the Free Software Foundation *
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* *
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***************************************************************************/
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/**
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use this class together with opcxmlda_client.
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opcxmlda_client will fill the shared memory with variables read over opc xml-da.
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opcxmlda_client will receive outgoing writes through it's mailbox.
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*/
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#ifndef _RL_OPC_XML_DA_H_
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#define _RL_OPC_XML_DA_H_
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#include "rldefine.h"
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#include "rlmailbox.h"
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#include "rlsharedmemory.h"
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/*! <pre>
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This class is for data acquisition within pvserver according to the pvbrowser principle.
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It communicates with the daemon opcxmlda_client by the means of a shared memory and a mailbox.
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</pre> */
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class rlOpcXmlDa
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{
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public:
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// shared memory header
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typedef struct
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{
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char ident[4]; // must be "opc"
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int maxItemNameLength; // maximum length of an item name
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int maxNameLength; // maximum length of the item value
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int numItems; // number of items in shared memory
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int readErrorCount; // 0...65536 incremented by each read error
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int writeErrorCount; // 0...65536 incremented by each write error
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int spare[8]; // for future use
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char cspare[32]; // for future use
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}SHM_HEADER;
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enum OPC_XML_DA_ENUM
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{
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OPCXMLDA_ERROR = 256*256*128
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};
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#ifdef RLWIN32
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rlOpcXmlDa(const char *mailbox="c:\\automation\\mbx\\opcxmlda.mbx", const char *shared_memory="c:\\automation\\shm\\opcxmlda.shm", long shared_memory_size=65536);
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#else
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rlOpcXmlDa(const char *mailbox="/srv/automation/mbx/opcxmlda.mbx", const char *shared_memory="/srv/automation/shm/opcxmlda.shm", long shared_memory_size=65536);
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#endif
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virtual ~rlOpcXmlDa();
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const char *stringValue(const char *variable);
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int intValue(const char *variable);
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float floatValue(const char *variable);
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int writeStringValue(const char *variable, const char *value);
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int writeIntValue(const char *variable, int value);
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int writeFloatValue(const char *variable, float value);
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int readErrorCount();
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int writeErrorCount();
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int shmStatus(); // 0 if shared memory is ok | ERROR if shared memory is not ok
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private:
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SHM_HEADER *shmheader;
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const char *shmvalues;
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rlMailbox *mbx;
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rlSharedMemory *shm;
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};
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#endif
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