Ravinder Singh

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Friday, February 24, 1984
I am a software engineer by profession and programmer by passion. I love working on software projects which help make a positive impact on the society.

File operations using objects in C++ - Update method in the data access class

Category: Programming Tutorials Date: Thursday, July 21, 2016

For the C++ training group, from our classroom discussions on 19th July, 2016

This is the code which you should practice in the add method in the BranchDA data access class.

static bool Update(Branch *branch)
    {
        int currentObjectLocation = 0;
        Branch *temp = new Branch();

        fstream fs;

        // Create the connection
        // Open the connection

        fs.open ("BranchData.dat", ios::in | ios::out | ios::binary);

        // Read or write the data

        fs.seekp(0, ios::beg);
        while(fs.read((char*)temp, sizeof(Branch)))
        {
            cout << "Current position of put pointer : " << fs.tellp() << "\n";
            currentObjectLocation = fs.tellp();

             if(temp->GetId() == branch->GetId())
             {
                 fs.seekp(currentObjectLocation - sizeof(Branch));

                cout << "Currently writing data at location : " << fs.tellp() << "\n";

                 fs.write( (char*)branch, sizeof(Branch) );

                 break;
             }
        }

        fs.close();

        return true;
    }



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