public static void WaitForUsbDeviceRemove()
{
WndProcReceiverForm.WaitForSingleWndProc(
m =>
m.Msg == WM_DEVICECHANGE &&
(int)m.WParam == DBT_DEVICEREMOVECOMPLETE
);
}
public static Tuple <Message, TObject> WaitForSingleWndProc <TObject>(Func <Message, bool> predicate, Func <Message, TObject> generator)
{
using (WndProcReceiverForm form = new WndProcReceiverForm())
{
form.Show();
return(form.WaitForWndProc(predicate, generator));
}
}
public static Message WaitForSingleWndProc(Func <Message, bool> predicate)
{
using (WndProcReceiverForm form = new WndProcReceiverForm())
{
form.Show();
return(form.WaitForWndProc(predicate));
}
}
/// <summary>
/// 等待 USB 存储设备接入。
/// </summary>
/// <returns>接入的 USB 设备盘符。</returns>
public static char WaitForUsbDevice()
{
DevBroadcastVolume vol = WndProcReceiverForm.WaitForSingleWndProc(
m =>
m.Msg == WM_DEVICECHANGE &&
(int)m.WParam == DBT_DEVICEARRIVAL &&
Marshal.ReadInt32(m.LParam, 4) == DBT_DEVTYP_VOLUME,
m =>
Marshal.PtrToStructure <DevBroadcastVolume>(m.LParam)).Item2;
BitArray bv = new BitArray(new int[] { vol.Mask });
char letter = '\0';
for (int i = 0; i < bv.Length; i++)
{
if (bv[i])
{
letter = (char)('A' + i);
}
}
return(letter);
}
