private void FreeAllServices()
{
// Don't use synchronization here.
// This will only be called during finalization
// and at that point synchronization doesn't matter.
// Also, the lock object might have already been finalized.
if (_servicePointers != null)
{
foreach (IntPtr servicePtr in _servicePointers)
{
ExtendedLinguisticServicesNativeMethods.MappingFreeServicesVoid(servicePtr);
}
_servicePointers = null;
_guidToService = null;
}
}
/// <summary>
/// Constructs a new <see cref="MappingService">MappingService</see> object by instanciating an ELS service
/// by its guid. For Windows 7, the only supported GUIDs are provided as
/// readonly members of the <see cref="MappingAvailableServices">MappingAvailableServices</see> class.
///
/// If the service
/// with the specified guid doesn't exist, a <see cref="LinguisticException">LinguisticException</see> is thrown.
/// </summary>
/// <param name="serviceIdentifier">The guid of the service to instantiate.</param>
public MappingService(Guid serviceIdentifier)
{
ThrowIfNotWin7();
IntPtr servicePointer;
uint serviceCount = 0;
uint hresult;
// First, check to see if we already have the service in the cache:
servicePointer = ServiceCache.Instance.GetCachedService(ref serviceIdentifier);
if (servicePointer != IntPtr.Zero)
{
_service = servicePointer;
_win32Service = Win32NativeInteropTools.Unpack <Win32Service>(_service);
}
else // pService is IntPtr.Zero in this case.
{
// If we don't, we must find it via MappingGetServices:
IntPtr guidPtr = IntPtr.Zero;
try
{
guidPtr = Marshal.AllocHGlobal(Win32NativeInteropTools.SizeOfGuid);
var enumOptions = new Win32EnumOptions
{
_size = InteropTools.SizeOfWin32EnumOptions
};
Marshal.StructureToPtr(serviceIdentifier, guidPtr, false);
enumOptions._pGuid = guidPtr;
hresult = ExtendedLinguisticServicesNativeMethods.MappingGetServices(ref enumOptions, ref servicePointer, ref serviceCount);
if (hresult != 0)
{
throw new LinguisticException(hresult);
}
if (servicePointer == IntPtr.Zero)
{
throw new InvalidOperationException();
}
if (serviceCount != 1)
{
if (ExtendedLinguisticServicesNativeMethods.MappingFreeServices(servicePointer) == 0)
{
throw new InvalidOperationException();
}
else
{
throw new LinguisticException(hresult);
}
}
var services = new IntPtr[1];
ServiceCache.Instance.RegisterServices(ref servicePointer, services);
_service = services[0];
_win32Service = Win32NativeInteropTools.Unpack <Win32Service>(_service);
}
finally
{
if (servicePointer != IntPtr.Zero)
{
// Ignore the result if an exception is being thrown.
ExtendedLinguisticServicesNativeMethods.MappingFreeServicesVoid(servicePointer);
}
if (guidPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(guidPtr);
}
}
}
}