public static extern bool SetupDiGetDeviceInstanceId(
IntPtr DeviceInfoSet,
ref DeviceInfoData did,
[MarshalAs(UnmanagedType.LPTStr)] StringBuilder DeviceInstanceId,
int DeviceInstanceIdSize,
out int RequiredSize
);
public static extern bool SetupDiEnumDeviceInfo(SafeDeviceInfoSetHandle deviceInfoSet, int memberIndex,
ref DeviceInfoData deviceInfoData);
private static DeviceInfoData[] GetDeviceInfoData(SafeDeviceInfoSetHandle handle)
{
var data = new List<DeviceInfoData>();
var did = new DeviceInfoData();
var didSize = Marshal.SizeOf(did);
did.Size = didSize;
var index = 0;
while (NativeMethods.SetupDiEnumDeviceInfo(handle, index, ref did))
{
data.Add(did);
index += 1;
did = new DeviceInfoData();
did.Size = didSize;
}
return data.ToArray();
}
// Find the index of the particular DeviceInfoData for the instanceId.
private static int GetIndexOfInstance(SafeDeviceInfoSetHandle handle, DeviceInfoData[] diData, string instanceId)
{
const int ERROR_INSUFFICIENT_BUFFER = 122;
for (var index = 0; index <= diData.Length - 1; index++)
{
var sb = new StringBuilder(1);
var requiredSize = 0;
var result = NativeMethods.SetupDiGetDeviceInstanceId(handle.DangerousGetHandle(), ref diData[index],
sb, sb.Capacity, out requiredSize);
if (result == false && Marshal.GetLastWin32Error() == ERROR_INSUFFICIENT_BUFFER)
{
sb.Capacity = requiredSize;
result = NativeMethods.SetupDiGetDeviceInstanceId(handle.DangerousGetHandle(), ref diData[index], sb,
sb.Capacity, out requiredSize);
}
if (result == false)
throw new Win32Exception();
if (instanceId.Equals(sb.ToString()))
{
return index;
}
}
// not found
return -1;
}
// enable/disable...
private static void EnableDevice(SafeDeviceInfoSetHandle handle, DeviceInfoData diData, bool enable)
{
var @params = new PropertyChangeParameters();
// The size is just the size of the header, but we've flattened the structure.
// The header comprises the first two fields, both integer.
@params.Size = 8;
@params.DiFunction = DiFunction.PropertyChange;
@params.Scope = Scopes.Global;
@params.StateChange = enable ? StateChangeAction.Enable : StateChangeAction.Disable;
var result = NativeMethods.SetupDiSetClassInstallParams(handle, ref diData, ref @params,
Marshal.SizeOf(@params));
if (result == false) throw new Win32Exception();
result = NativeMethods.SetupDiCallClassInstaller(DiFunction.PropertyChange, handle, ref diData);
if (result != false) return;
var err = Marshal.GetLastWin32Error();
if (err == (int) SetupApiError.NotDisableable)
throw new ArgumentException("Device can't be disabled (programmatically or in Device Manager).");
if (err >= (int) SetupApiError.NoAssociatedClass &&
err <= (int) SetupApiError.OnlyValidateViaAuthenticode)
throw new Win32Exception("SetupAPI error: " + ((SetupApiError) err).ToString());
throw new Win32Exception();
}