rlOpcXmlDa Class Reference

#include <rlopcxmlda.h>

Collaboration diagram for rlOpcXmlDa:

Classes
struct	SHM_HEADER

Public Types
enum	OPC_XML_DA_ENUM { OPCXMLDA_ERROR = 256*256*128 }

Public Member Functions
	rlOpcXmlDa (const char *mailbox="c:\utomation\bx\pcxmlda.mbx", const char *shared_memory="c:\utomation\hm\pcxmlda.shm", long shared_memory_size=65536)
virtual	~rlOpcXmlDa ()
const char *	stringValue (const char *variable)
int	intValue (const char *variable)
float	floatValue (const char *variable)
int	writeStringValue (const char *variable, const char *value)
int	writeIntValue (const char *variable, int value)
int	writeFloatValue (const char *variable, float value)
int	readErrorCount ()
int	writeErrorCount ()
int	shmStatus ()

Private Attributes
SHM_HEADER *	shmheader
const char *	shmvalues
rlMailbox *	mbx
rlSharedMemory *	shm

Detailed Description

use this class together with opcxmlda_client. opcxmlda_client will fill the shared memory with variables read over opc xml-da. opcxmlda_client will receive outgoing writes through it's mailbox.

This class is for data acquisition within pvserver according to the pvbrowser principle.
It communicates with the daemon opcxmlda_client by the means of a shared memory and a mailbox.

Definition at line 33 of file rlopcxmlda.h.

Member Enumeration Documentation

OPC_XML_DA_ENUM

enum rlOpcXmlDa::OPC_XML_DA_ENUM

Enumerator
OPCXMLDA_ERROR

Definition at line 49 of file rlopcxmlda.h.

  {
    OPCXMLDA_ERROR = 256*256*128
  };

Constructor & Destructor Documentation

rlOpcXmlDa()

rlOpcXmlDa::rlOpcXmlDa	(	const char *	mailbox = "c:\\automation\\mbx\\opcxmlda.mbx",
		const char *	shared_memory = "c:\\automation\\shm\\opcxmlda.shm",
		long	shared_memory_size = 65536
	)

Definition at line 21 of file rlopcxmlda.cpp.

{
  mbx = new rlMailbox(mailbox);
  shm = new rlSharedMemory(shared_memory,shared_memory_size);
  shmheader = (SHM_HEADER *) shm->getUserAdr();
  shmvalues = ((const char *)shmheader) + sizeof(SHM_HEADER);
}

~rlOpcXmlDa()

rlOpcXmlDa::~rlOpcXmlDa ( )

virtual

Definition at line 29 of file rlopcxmlda.cpp.

{
  delete mbx;
  delete shm;
}

Member Function Documentation

floatValue()

float rlOpcXmlDa::floatValue

(

const char *

variable

)

Definition at line 74 of file rlopcxmlda.cpp.

{
  const char *cptr;
  float ret;

  cptr = stringValue(variable);
  if(isdigit(*cptr) || *cptr == '-')
  {
    ret = OPCXMLDA_ERROR;
    sscanf(cptr,"%f",&ret);
    return ret;
  }
  return OPCXMLDA_ERROR;
}

intValue()

int rlOpcXmlDa::intValue

(

const char *

variable

)

Definition at line 59 of file rlopcxmlda.cpp.

{
  const char *cptr;
  int ret;

  cptr = stringValue(variable);
  if(isdigit(*cptr))
  {
    ret = OPCXMLDA_ERROR;
    sscanf(cptr,"%d",&ret);
    return ret;
  }
  return OPCXMLDA_ERROR;
}

readErrorCount()

int rlOpcXmlDa::readErrorCount

(

)

Definition at line 107 of file rlopcxmlda.cpp.

{
  if(shmheader == NULL) return OPCXMLDA_ERROR;
  return shmheader->readErrorCount;
}

shmStatus()

int rlOpcXmlDa::shmStatus

(

)

Definition at line 119 of file rlopcxmlda.cpp.

{
  if(shmheader == NULL) return OPCXMLDA_ERROR;
  if(shm->status == rlSharedMemory::OK) return 0;
  return OPCXMLDA_ERROR;
}

stringValue()

const char * rlOpcXmlDa::stringValue

(

const char *

variable

)

Definition at line 35 of file rlopcxmlda.cpp.

{
  int value_offset, delta_index, nmax, i;
  const char *cptr;

  if(shmheader == NULL) return "OPCXMLDA_ERROR";
  if(strcmp(shmheader->ident,"opc") != 0) return "OPCXMLDA_ERROR";
  value_offset = shmheader->maxItemNameLength + 1;
  delta_index  = value_offset + shmheader->maxNameLength + 1;
  nmax         = shmheader->numItems;

  cptr = shmvalues;
  for(i=0; i<nmax; i++)
  {
    if(strcmp(cptr,variable) == 0)
    {
      return cptr + value_offset;
    }
    cptr += delta_index;
  }

  return "OPCXMLDA_ERROR";
}

writeErrorCount()

int rlOpcXmlDa::writeErrorCount

(

)

Definition at line 113 of file rlopcxmlda.cpp.

{
  if(shmheader == NULL) return OPCXMLDA_ERROR;
  return shmheader->writeErrorCount;
}

writeFloatValue()

int rlOpcXmlDa::writeFloatValue	(	const char *	variable,
		float	value
	)

Definition at line 101 of file rlopcxmlda.cpp.

{
  mbx->printf("%s,%f\n",variable,value);
  return 0;
}

writeIntValue()

int rlOpcXmlDa::writeIntValue	(	const char *	variable,
		int	value
	)

Definition at line 95 of file rlopcxmlda.cpp.

{
  mbx->printf("%s,%d\n",variable,value);
  return 0;
}

writeStringValue()

int rlOpcXmlDa::writeStringValue	(	const char *	variable,
		const char *	value
	)

Definition at line 89 of file rlopcxmlda.cpp.

{
  mbx->printf("%s,%s\n",variable,value);
  return 0;
}

Member Data Documentation

mbx

rlMailbox* rlOpcXmlDa::mbx

private

Definition at line 73 of file rlopcxmlda.h.

shm

rlSharedMemory* rlOpcXmlDa::shm

private

Definition at line 74 of file rlopcxmlda.h.

shmheader

SHM_HEADER* rlOpcXmlDa::shmheader

private

Definition at line 71 of file rlopcxmlda.h.

shmvalues

const char* rlOpcXmlDa::shmvalues

private

Definition at line 72 of file rlopcxmlda.h.

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The documentation for this class was generated from the following files:

• rlopcxmlda.h
• rlopcxmlda.cpp