// ------------------------------- //
// -------- Start of File -------- //
// ------------------------------- //
// ----------------------------------------------------------- //
// C++ Source Code File Name: testprog.cpp
// Compiler Used: MSVC, BCC32, GCC, HPUX aCC, SOLARIS CC
// Produced By: glNET Software
// File Creation Date: 02/04/1997
// Date Last Modified: 06/12/2001
// Copyright (c) 2001 glNET Software
// ----------------------------------------------------------- //
// ------------- 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
gxDatabase persistent checksum example.
*/
// ----------------------------------------------------------- //
#include <iostream.h>
#include <iomanip.h>
#include <string.h>
#include "gxdbase.h"
#include "gxfloat.h"
#include "gxdstats.h"
const int name_length = 16;
class DatabaseObject
{
public:
DatabaseObject() { name[0] = 0; oid = (gxINT32)0, cid = (gxFLOAT64)0; }
DatabaseObject(const char *s, long i, double d);
public:
void DisplayObject();
public: // Platform independent data members
char name[name_length]; // Fixed string type
gxINT32 oid; // Integer type
gxFLOAT64 cid; // Floating point type
};
DatabaseObject::DatabaseObject(const char *s, long i, double d)
{
for(int j = 0; j < name_length; j++) name[j] = 0; // Clear the name string
strcpy(name, s);
oid = i;
cid = d;
}
void DatabaseObject::DisplayObject()
{
cout << "Database object name: " << name << endl;
cout << "Database object OID: " << oid << endl;
cout.setf(ios::showpoint | ios::fixed);
cout.precision(3);
cout << "Database object CID: " << cid << endl;
}
void PausePrg()
{
cout << endl;
cout << "Press enter to continue..." << endl;
cin.get();
}
int main()
{
gxDatabase *f = new gxDatabase;
const char *fname = "simple.gxd";
int exists;
cout << endl;
cout << "Simple checksum example." << endl;
if(!gxDatabase::Exists(fname)) {
cout << "Creating new file..." << endl;
f->Create(fname);
if(CheckError(f) != 0) return 1;
exists = 0;
}
else {
cout << "Opening existing file..." << endl;
f->Open(fname);
if(CheckError(f) != 0) return 1;
exists = 1;
}
PausePrg();
DatabaseStats(f);
PausePrg();
FAU addr;
int rv;
__ULWORD__ object_crc, calc_crc;
if(!exists) {
cout << "Adding object to database file..." << endl;
// Allocate a block to store the object
addr = f->Alloc(sizeof(DatabaseObject));
// Construct the datbase object
DatabaseObject ob("Mouse", (long)addr, 1035.101);
f->Write(&ob, sizeof(DatabaseObject));
// CRC checksum routines
__SBYTE__ rev_letter = f->GetRevLetter();
if((rev_letter == ' ') || (rev_letter == 0)) {
cout << "This database revision does not support persistent checksums"
<< endl;
}
else {
f->WriteObjectChecksum(addr);
f->ReadObjectChecksum(addr, &object_crc, &calc_crc);
cout.setf(ios::uppercase);
cout << "Object CRC = 0x" << setfill('0') << setw(8) << hex
<< object_crc << endl;
cout << "Calculated CRC = 0x" << setfill('0') << setw(8) << hex
<< calc_crc << dec << endl;
BlockStats(f, addr);
}
}
else {
f->Open(fname);
cout << "Reading the first object from the database file..." << endl;
addr = f->FindFirstBlock();
// CRC checksum routines
__SBYTE__ rev_letter = f->GetRevLetter();
if((rev_letter == ' ') || (rev_letter == 0)) {
cout << "This database revision does not support persistent checksums"
<< endl;
}
else {
rv = f->ReadObjectChecksum(addr+f->BlockHeaderSize(),
&object_crc, &calc_crc);
if(!rv) cout << "Checksum error!" << endl;
cout.setf(ios::uppercase);
cout << "Object CRC = 0x" << setfill('0') << setw(8) << hex
<< object_crc << endl;
cout << "Calculated CRC = 0x" << setfill('0') << setw(8) << hex
<< calc_crc << dec << endl;
cout.unsetf(ios::uppercase);
cout << endl;
}
DatabaseObject buf;
f->Read(&buf, sizeof(DatabaseObject), addr+f->BlockHeaderSize());
buf.DisplayObject();
}
cout << "Exiting..." << endl;
f->Close();
if(CheckError(f) != 0) return 1;
delete f;
return 0;
}
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// ------------------------------- //