C++/새 장치 감지 WM_DEVICECHANGE

...
ON_MESSAGE(WM_DEVICECHANGE, &CTestDlg::OnMyDeviceChange)
...

char DriveLetterFromMask(int mask) {
	int count = 0; while (mask > 1) { mask >>= 1; count++; }
	return "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[count];
}

LRESULT CTestDlg::OnMyDeviceChange(WPARAM wParam, LPARAM lParam)
{
	if ( DBT_DEVICEARRIVAL == wParam || DBT_DEVICEREMOVECOMPLETE == wParam ) {
		PDEV_BROADCAST_HDR pHdr = (PDEV_BROADCAST_HDR)lParam;
		PDEV_BROADCAST_DEVICEINTERFACE pDevInf;
		PDEV_BROADCAST_HANDLE pDevHnd;
		PDEV_BROADCAST_OEM pDevOem;
		PDEV_BROADCAST_PORT pDevPort;
		PDEV_BROADCAST_VOLUME pDevVolume;
		switch( pHdr->dbch_devicetype ) {
			case DBT_DEVTYP_DEVICEINTERFACE:
				pDevInf = (PDEV_BROADCAST_DEVICEINTERFACE)pHdr;
				//UpdateDevice(pDevInf, wParam);
				break;

case DBT_DEVTYP_HANDLE:
				pDevHnd = (PDEV_BROADCAST_HANDLE)pHdr;
				break;

case DBT_DEVTYP_OEM:
				pDevOem = (PDEV_BROADCAST_OEM)pHdr;
				break;

case DBT_DEVTYP_PORT:
				pDevPort = (PDEV_BROADCAST_PORT)pHdr;
				break;

case DBT_DEVTYP_VOLUME:
				pDevVolume = (PDEV_BROADCAST_VOLUME)pHdr;

CString str;
				str.Format(_T("%C:"), DriveLetterFromMask(pDevVolume->dbcv_unitmask));

if (wParam == DBT_DEVICEARRIVAL)
				{
					OutputDebugString(_T("새 장치 감지"));
					OutputDebugString(str.GetBuffer(0));
				}

break;
		}
	}
#endif
	return 0;
}

새 장치 감지
F: