DatabaseObjectSrcExample

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    // C++ Source Code File Name: dbobject.cpp
    // Compiler Used: MSVC, BCC32, GCC, HPUX aCC, SOLARIS CC
    // Produced By: DataReel Software Development Team
    // File Creation Date: 09/18/1997
    // Date Last Modified: 06/17/2016
    // Copyright (c) 2001-2016 DataReel Software Development
    // ----------------------------------------------------------- //
    // ------------- Program Description and Details ------------- //
    // ----------------------------------------------------------- //
    /*
    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; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
    USA

    Database object class used with the client/server example.
    */
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    #include "gxdlcode.h"

    #include "dbobject.h"

    DatabaseObjectData::DatabaseObjectData()
    {
      oid = (OID)0;
      cid = (CID)0;
      for(int i = 0; i < gxMaxNameLength; i++) name[i] = 0;
    }

    FAU_t DatabaseObject::WriteObject()
    {
      FAU_t addr = Alloc(sizeof(DatabaseObjectData));
      if(addr == (FAU_t)0) return (FAU_t)0;

      Write(p, sizeof(DatabaseObjectData));
      if(gxd_error != gxDBASE_NO_ERROR) return (FAU_t)0;

      return addr;
    }

    int DatabaseObject::ReadObject(FAU_t Address)
    {
      // Optimize seeks during intervening reads
      SeekTo(Address);
      Read((char *)this->p, sizeof(DatabaseObjectData));
      if(gxd_error != gxDBASE_NO_ERROR) return 0;
      return 1;
    }

    FAU_t DatabaseObject::FindObject()
    {
      // If not using index file or entry not found, search the data file
      DatabaseObjectData dbobject;
      dbobject.oid = p->oid;
      dbobject.cid = p->cid;
      strcpy(dbobject.name, p->name);

      FAU_t object_address = (FAU_t)0;

      while(1) {
        object_address = FindFirstObject(object_address);
        if(object_address == (FAU_t)0) break;
        ReadObject(object_address);
        if(gxd_error == gxDBASE_NO_ERROR) {
          if(strcmp(p->name, dbobject.name) == 0) {
    	return object_address; // Found unique data member
          }
        }
        object_address++; // Offset the block address
      }

      // Reset the objects data
      p->oid = dbobject.oid;
      p->cid = dbobject.cid;
      strcpy(p->name, dbobject.name);

      return (FAU_t)0; // Could not find
    }

    FAU_t DatabaseObject::ChangeObject(const DatabaseObjectData &new_dbobject_info)
    {
      FAU_t addr = FindObject();
      if(addr == (FAU_t)0) return (FAU_t)0; // Object does not exist
      Write(&new_dbobject_info, sizeof(new_dbobject_info), addr);
      if(gxd_error != gxDBASE_NO_ERROR) return (FAU_t)0;
      strcpy(p->name, new_dbobject_info.name);
      p->oid = new_dbobject_info.oid;
      p->cid = new_dbobject_info.cid;
      return addr;
    }

    FAU_t DatabaseObject::DeleteObject()
    {
      FAU_t addr = FindObject();
      if(addr == (FAU_t)0) return (FAU_t)0; // Object does not exist
      Delete(addr);
      if(gxd_error != gxDBASE_NO_ERROR) return (FAU_t)0;
      return addr;
    }

    FAU_t DatabaseObject::RemoveObject()
    {
      FAU_t addr = FindObject();
      if(addr == (FAU_t)0) return (FAU_t)0; // Object does not exist
      Remove(addr);
      if(gxd_error != gxDBASE_NO_ERROR) return (FAU_t)0;
      return addr;
    }
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