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 bool GetInstanceMatch(SafeHandle handle, DeviceInfoData diData, string instanceId)
{
int requiredSize;
StringBuilder sb = new StringBuilder(1);
bool result = NativeMethods.SetupDiGetDeviceInstanceId(handle.DangerousGetHandle(), ref diData, sb, sb.Capacity, out requiredSize);
if (!result && Marshal.GetLastWin32Error() == ERROR_INSUFFICIENT_BUFFER)
{
sb.Capacity = requiredSize;
result = NativeMethods.SetupDiGetDeviceInstanceId(handle.DangerousGetHandle(), ref diData, sb, sb.Capacity, out requiredSize);
}
if (!result)
{
throw new Win32Exception();
}
// Using .Contains since it's more lenient
return sb.ToString().Contains(instanceId);
}
// Find the index of the particular DeviceInfoData for the instanceId.
private static int GetIndexOfInstance(SafeDeviceInfoSetHandle handle, DeviceInfoData[] diData, string instanceId)
{
for (int index = 0; index < diData.Length; index++)
{
if (GetInstanceMatch(handle, diData[index], instanceId))
return index;
}
// not found
return -1;
}
private static DeviceInfoData[] GetDeviceInfoData(SafeDeviceInfoSetHandle handle)
{
List<DeviceInfoData> data = new List<DeviceInfoData>();
DeviceInfoData did = new DeviceInfoData();
int index = 0;
int didSize = Marshal.SizeOf(did);
did.Size = didSize;
while (NativeMethods.SetupDiEnumDeviceInfo(handle, index, ref did))
{
data.Add(did);
index += 1;
did = new DeviceInfoData { Size = didSize };
}
return data.ToArray();
}
// enable/disable...
private static void EnableDevice(SafeDeviceInfoSetHandle handle, DeviceInfoData diData, bool enable)
{
PropertyChangeParameters parameters = new PropertyChangeParameters
{
Size = 8,
DiFunction = DiFunction.PropertyChange,
Scope = Scopes.Global,
StateChange = enable ? StateChangeAction.Enable : StateChangeAction.Disable
};
// The size is just the size of the header, but we've flattened the structure.
// The header comprises the first two fields, both integer.
bool result = NativeMethods.SetupDiSetClassInstallParams(handle, ref diData, ref parameters, Marshal.SizeOf(parameters));
if (result == false)
throw new Win32Exception();
result = NativeMethods.SetupDiCallClassInstaller(DiFunction.PropertyChange, handle, ref diData);
if (result)
{
return;
}
int 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));
throw new Win32Exception();
}