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 );
static DeviceInfoData[] GetDeviceInfoData( SafeDeviceInfoSetHandle handle )
{
List<DeviceInfoData> data = new List<DeviceInfoData>();
DeviceInfoData did = new DeviceInfoData();
int didSize = Marshal.SizeOf( did );
did.Size = didSize;
int index = 0;
while ( NativeMethods.SetupDiEnumDeviceInfo( handle, index, ref did ) )
{
data.Add( did );
index += 1;
did = new DeviceInfoData();
did.Size = didSize;
}
return data.ToArray();
}
/// <summary>
/// Find the index of the particular DeviceInfoData for the instanceId.
/// </summary>
/// <param name="handle"></param>
/// <param name="diData"></param>
/// <param name="instanceId"></param>
/// <returns></returns>
static int GetIndexOfInstance( SafeDeviceInfoSetHandle handle, DeviceInfoData[] diData, string instanceId )
{
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( 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...
static void EnableDevice( SafeDeviceInfoSetHandle handle, DeviceInfoData diData, bool enable )
{
PropertyChangeParameters @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;
if ( enable )
{
@params.StateChange = StateChangeAction.Enable;
}
else
{
@params.StateChange = StateChangeAction.Disable;
}
bool result = NativeMethods.SetupDiSetClassInstallParams( handle, ref diData, ref @params, Marshal.SizeOf( @params ) );
if ( result == false )
{
throw new Win32Exception( Marshal.GetLastWin32Error() );
}
result = NativeMethods.SetupDiCallClassInstaller( DiFunction.PropertyChange, handle, ref diData );
if ( result == false )
{
int err = Marshal.GetLastWin32Error();
if ( err == (int)SetupApiError.NotDisableable )
{
throw new ArgumentException( "Device can't be disabled (programmatically or in Device Manager)." );
}
else if ( err <= (int)SetupApiError.NoAssociatedClass && err >= (int)SetupApiError.OnlyValidateViaAuthenticode )
{
throw new Win32Exception( "SetupAPI error: " + ( (SetupApiError)err ).ToString() );
}
else
{
throw new Win32Exception( err );
}
}
}