I am new to Windows API. And I have been assigned the task to check the compatibility of a project on Windows 64 bit Operating system.

I have a ListView control which is dynamically populated and on the click event of any row in the table two buttons are enabled.

I have used the SendMessage function to handle the Mouse click event on a particular row. Althoug it works fine in 32 bit the code doesn't work in 64 bit.

Below is the code snippet.

case NM_CLICK:

// Get highlighted row

m_index = SendMessage(hWndView, LVM_GETHOTITEM, 0, 0);

if(m_index < 0)

{

EnableWindow(GetDlgItem(hDlg, IDC_GET_HOST), FALSE);

EnableWindow(GetDlgItem(hDlg, IDC_UNENROLL_HOST), FALSE);

}

else

{

EnableWindow(GetDlgItem(hDlg, IDC_GET_HOST), TRUE);

EnableWindow(GetDlgItem(hDlg, IDC_UNENROLL_HOST), TRUE);

}

break;

Note: I have previously defined the variable m_index. The function SendMessage always returns a value -1 because of whihc the buttons are not activated.

Any help will be appreciated.

Its kinda urgent.

Thanks in advance

Amrita