Simple function that's supposed to write to a file - doesn't work

Here's a simple function that's supposed to write to a file (random access file), but it doesn't seem to work. Any ideas why?

Thanks!!

Code:

---

void addRecord(fstream& file)
{
        InventoryItem invItem;
//        InventoryItem tempInvItem;
        char tempSerialNum[3];
        int tempQuantity;
        double tempPrice;
//        double tempProfitLoss;
        long recNum;


        cout << "Enter data for the new record: " << endl
                << "Serial Number: " << endl;
        cin >> tempSerialNum;

       
        recNum = atol(tempSerialNum);
        if(!validRecNum(recNum))
                return;

        invItem.putSerialNumber(tempSerialNum);

        cout << "Quantity: " << endl;
        cin >> tempQuantity;
        invItem.putQuantity(tempQuantity);

        cout << "Price: " << endl;
        cin >> tempPrice;
        invItem.puPrice(tempPrice);

//        file.seekp((recNum - 1) * sizeof(InventoryItem), ios::beg);
//        file.read((char *)&tempInvItem, sizeof(InventoryItem));

        //if (strcmp(tempInvItem.serialNumber, "") == 0)
//        {
                file.seekp((recNum - 1) * sizeof(InventoryItem), ios::beg);
                file.write((char *)&invItem,sizeof(InventoryItem));
        //        file.flush();
                cout << "Record " << invItem.getSerialNumber() << " added to file.";
//        }

}

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You could try using ifstream and ofstream to do what you want instead. There's a tutorial on this site that tells you how to use it.

http://www.cprogramming.com/tutorial/lesson10.html