搭建PVB架构，实现前端的基础布局、菜单、表格、图示等功能

libs/pvb/include/rllib/rldataacquisitionprovider.h

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+/***************************************************************************
+                rldataacquisitionprovider.h  -  description
+                             -------------------
+    begin                : Mon Sep 03 2007
+    copyright            : (C) 2007 by pvbrowser
+    email                : lehrig@t-online.de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE as        *
+ *   published by the Free Software Foundation                             *
+ *                                                                         *
+ ***************************************************************************/
+#ifndef _RL_DAQ_PROVIDER_H_
+#define _RL_DAQ_PROVIDER_H_
+
+#include "rldefine.h"
+#include "rlsharedmemory.h"
+
+/*! <pre>
+This class is usefull to implement your own data acquisition according to the pvbrowser principle.
+It is used within pvb/template/dataacquisition/client/data_acquisition_provider_template.cpp
+Starting from there you can implement your data acquisition.
+</pre> */
+class rlDataAcquisitionProvider
+{
+public:
+  // shared memory header
+  typedef struct
+  {
+    char ident[4];          // must be "daq"
+    int  maxItemNameLength; // maximum length of an item name
+    int  maxNameLength;     // maximum length of the item value
+    int  numItems;          // number of items in shared memory
+    int  readErrorCount;    // 0...65536 incremented by each read error
+    int  writeErrorCount;   // 0...65536 incremented by each write error
+    int  lifeCounter;       // 0...65536 incremented each cycle
+    int  spare[7];          // for future use
+    char cspare[32];        // for future use
+  }SHM_HEADER;
+  
+  enum DAQ_PROVIDER_ENUM
+  {
+    DAQ_PROVIDER_ERROR = 256*256*128
+  };
+
+#ifdef RLWIN32  
+  rlDataAcquisitionProvider(int maxNameLength=31, const char *shared_memory="c:\\automation\\shm\\dataacquisition.shm", long shared_memory_size=65536);
+#else
+  rlDataAcquisitionProvider(int maxNameLength=31, const char *shared_memory="/srv/automation/shm/dataacquisition.shm", long shared_memory_size=65536);
+#endif
+  virtual    ~rlDataAcquisitionProvider();
+  int         readItemList(const char *filename); // return DAQ_PROVIDER_ERROR | num_items
+  const char *firstItem();
+  const char *nextItem();
+  const char *stringValue(const char *variable);
+  int         intValue(const char *variable);
+  float       floatValue(const char *variable);
+  int         setStringValue(const char *variable, const char *value);
+  int         setIntValue(const char *variable, int value);
+  int         setFloatValue(const char *variable, float value);
+  int         readErrorCount();
+  int         writeErrorCount();
+  int         lifeCounter();
+  int         setReadErrorCount(int count);
+  int         setWriteErrorCount(int count);
+  int         setLifeCounter(int count);
+  int         shmStatus(); // 0 if shared memory is ok | DAQ_PROVIDER_ERROR if shared memory is not ok
+  int         setAllowAddValues(int allow, int maxItemNameLength);
+
+private:
+  SHM_HEADER     *shmheader;
+  char           *shmvalues;
+  int             current_item, allow_add_values;
+  rlSharedMemory *shm;
+  long            sharedMemorySize;
+};
+
+#endif
+