Detecting USB notification in Qt on windows

Question

In my qt application I want to save some application output data to an file in my usb pen drive. I need to put following features in my qt application

1. Detect t

Answer 1

Handle WM_DEVICECHANGE - See http://lists.trolltech.com/qt-interest/2001-08/thread00698-0.html for how to handle windows messages in QT.

If wParam is DBT_DEVICEARRIVAL then cast lParam to a DEV_BROADCAST_HDR *

If the structures dbch_devicetype is DBT_DEVTYP_VOLUME cast lParam again, this time to a DEV_BROADCAST_VOLUME *

Now check the dbcv_unitmask bit field, iterate over bits 0..31 and check if the corresponding drive match your USB drive.

if (wParam == DBT_DEVICEARRIVAL) {
  if (((DEV_BROADCAST_HDR *) lParam)->dbch_devicetype == DBT_DEVTYP_VOLUME) {
    DWORD Mask = ((DEV_BROADCAST_VOLUME *) lParam)->dbcv_unitmask;
    for (int i = 0; i < 32; ++i) {
      if (Mask & (1 << i)) {
        char RootPath[4] = "A:\\";
        RootPath[0] += i;
        // Check if the root path in RootPath is your USB drive.
      }
    }
  }
}