/// <summary>
/// Enable or disable a device.
/// </summary>
/// <param name="classGuid">The class guid of the device. Available in the device manager.</param>
/// <param name="instanceId">The device instance id of the device. Available in the device manager.</param>
/// <param name="enable">True to enable, False to disable.</param>
/// <remarks>Will throw an exception if the device is not Disableable.</remarks>
public static void SetDeviceEnabled(Guid classGuid, string instanceId, bool enable)
{
SafeDeviceInfoSetHandle diSetHandle = null;
try
{
// Get the handle to a device information set for all devices matching classGuid that are present on the
// system.
diSetHandle = NativeMethods.SetupDiGetClassDevs(ref classGuid, null, IntPtr.Zero, SetupDiGetClassDevsFlags.Present);
// Get the device information data for each matching device.
DeviceInfoData[] diData = GetDeviceInfoData(diSetHandle);
// Find the index of our instance.
int index = GetIndexOfInstance(diSetHandle, diData, instanceId);
// Enable/Disable.
EnableDevice(diSetHandle, diData[index], enable);
// EnableDevice(diSetHandle, diData[1], enable);
}
finally
{
if (diSetHandle != null)
{
if (diSetHandle.IsClosed == false)
{
diSetHandle.Close();
}
diSetHandle.Dispose();
}
}
}
/// <summary>
/// Tries to reset (disable/enable) the port with the given instance Id.
/// </summary>
/// <param name="instanceId">The instance Id of the port to reset.</param>
/// <returns>True, if the port was successfully resetted, otherwise false.</returns>
public static bool TryResetPortByInstanceId(string instanceId)
{
SafeDeviceInfoSetHandle diSetHandle = null;
if (!String.IsNullOrEmpty(instanceId))
{
try
{
Guid[] guidArray = GetGuidFromName("Ports");
//Get the handle to a device information set for all devices matching classGuid that are present on the
//system.
diSetHandle = NativeMethods.SetupDiGetClassDevs(
ref guidArray[0], null, IntPtr.Zero, SetupDiGetClassDevsFlags.DeviceInterface);
//Get the device information data for each matching device.
DeviceInfoData[] diData = GetDeviceInfoData(diSetHandle);
//Try to find the object with the same instance Id.
foreach (var infoData in diData)
{
var instanceIds = GetInstanceIdsFromClassGuid(infoData.ClassGuid);
foreach (var id in instanceIds)
{
if (id.Equals(instanceId))
{
//disable port
SetDeviceEnabled(infoData.ClassGuid, id, false);
//wait a moment
Thread.Sleep(5000);
//enable port
SetDeviceEnabled(infoData.ClassGuid, id, true);
return(true);
}
}
}
}
catch (Exception)
{
return(false);
}
finally
{
if (diSetHandle != null)
{
if (diSetHandle.IsClosed == false)
{
diSetHandle.Close();
}
diSetHandle.Dispose();
}
}
}
return(false);
}
private static List <string> GetInstanceIdsFromClassGuid(Guid classGuid)
{
SafeDeviceInfoSetHandle diSetHandle = null;
List <string> resultList = new List <string>();
try
{
// Get the handle to a device information set for all devices matching classGuid that are present on the
// system.
diSetHandle = NativeMethods.SetupDiGetClassDevs(ref classGuid, null, IntPtr.Zero, SetupDiGetClassDevsFlags.Present);
// Get the device information data for each matching device.
DeviceInfoData[] diData = GetDeviceInfoData(diSetHandle);
const int ERROR_INSUFFICIENT_BUFFER = 122;
for (int index = 0; index <= diData.Length - 1; index++)
{
StringBuilder sb = new StringBuilder(1);
int requiredSize = 0;
bool result = NativeMethods.SetupDiGetDeviceInstanceId(diSetHandle.DangerousGetHandle(), ref diData[index], sb, sb.Capacity, out requiredSize);
if (result == false && Marshal.GetLastWin32Error() == ERROR_INSUFFICIENT_BUFFER)
{
sb.Capacity = requiredSize;
result = NativeMethods.SetupDiGetDeviceInstanceId(diSetHandle.DangerousGetHandle(), ref diData[index], sb, sb.Capacity, out requiredSize);
resultList.Add(sb.ToString());
}
}
}
finally
{
if (diSetHandle != null)
{
if (diSetHandle.IsClosed == false)
{
diSetHandle.Close();
}
diSetHandle.Dispose();
}
}
return(resultList);
}
