/// <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;
}
