public Win32.USB_NODE_CONNECTION_INFORMATION_EX GetNodeConnectionInfo(IntPtr hHub, int portIndex)
{
int nBytesReturned;
int nNodeConnectionBytes = Marshal.SizeOf(typeof(Win32.USB_NODE_CONNECTION_INFORMATION_EX));
IntPtr ptrNodeConnection = Marshal.AllocHGlobal(nNodeConnectionBytes);
Win32.USB_NODE_CONNECTION_INFORMATION_EX nodeConnection = new Win32.USB_NODE_CONNECTION_INFORMATION_EX();
nodeConnection.ConnectionIndex = portIndex;
Marshal.StructureToPtr(nodeConnection, ptrNodeConnection, true);
if (!Win32.DeviceIoControl(hHub, Win32.IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX,
ptrNodeConnection, nNodeConnectionBytes, ptrNodeConnection, nNodeConnectionBytes,
out nBytesReturned, IntPtr.Zero))
{
int error = Marshal.GetLastWin32Error();
Marshal.FreeHGlobal(ptrNodeConnection);
return(null);
}
nodeConnection = (Win32.USB_NODE_CONNECTION_INFORMATION_EX)Marshal.PtrToStructure(ptrNodeConnection,
typeof(Win32.USB_NODE_CONNECTION_INFORMATION_EX));
Marshal.FreeHGlobal(ptrNodeConnection);
return(nodeConnection);
}
public int FindPortIndex(String deviceDriverInst)
{
int portIndex = 0;
IntPtr hHub = Open();
if (hHub.ToInt32() == Win32.INVALID_HANDLE_VALUE)
{
// ATLTRACE(_T("*** ERROR 0x%X (%d): Line %d of file %s\n"), error, error, __LINE__, __TFILE__);
throw new Win32Exception(Marshal.GetLastWin32Error());
}
// Loop through the Ports on the Hub any get the unique DriverKey if there is a device connected to
// the Port. If the DriveryKey from the hub matches the DriverKey for our device, we have our Hub Index.
foreach (UsbPort port in _Ports)
{
Win32.USB_NODE_CONNECTION_INFORMATION_EX nodeConnection = this.GetNodeConnectionInfo(hHub, port.Index);
// There is a device connected to this Port
if (nodeConnection.ConnectionStatus == Win32.USB_CONNECTION_STATUS.DeviceConnected)
{
// Get the Driver Key Name
String driverKey = this.GetNodeConnectionDriver(hHub, port.Index);
if (!String.IsNullOrEmpty(driverKey))
{
// If the Driver Keys match, this is the correct Port
if (String.Compare(driverKey, deviceDriverInst, true) == 0)
{
portIndex = port.Index;
break;
}
} // if ( got the driverKey )
} // if(connected)
} // foreach ( port )
Win32.CloseHandle(hHub);
return(portIndex);
}
