// ------------------------------- // // -------- 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; } // ----------------------------------------------------------- // // ------------------------------- // // --------- End of File --------- // // ------------------------------- //