How do I access data in std::unique_ptr?

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C++

Win32

The code below is snippet of a code in my application whose goal is to get item data from a listbox.

for (int j = 0; j <; iSelected; j++)
    {
        long long llCustomerID = SendMessage
        (GetDlgItem(hDlg, IDC_LIST1), LB_GETITEMDATA, pSelected[j], 0);
        vTransactions.push_back(llCustomerID);
    }

The item data has been set in this manner:

int iPos = SendMessage(GetDlgItem(hDlg, IDC_LIST1), LB_GETCURSEL, 0, 0);
SendMessage(GetDlgItem(hDlg, IDC_LIST1), LB_SETITEMDATA, iPos, (LPARAM)llCustomerID);

Memory was allocated to the smart pointer as shown below:

unique_ptr<int []> pSelected = make_unique<int []>(iSelCount);

Where, iSelCount is the number of selections made in the listbox as returned by LB_GETSELCOUNT message.

The problem is that llCustomerID receives 1, instead of the database value of the transaction which should be 25. The numeral 1 received happens to be the ID of the first transanctions listed in the lisbox which was never selected.

Where exactly have I missed it?

The code below shows how values were assigned to pSelected:

int iSelected = SendMessage(GetDlgItem(hDlg, IDC_LIST1), LB_GETSELITEMS, iSelCount, (LPARAM)pSelected.get());

What I have tried:

I have spent quality time trying to debug, but am yet to get any desired outcome.