internal override PacketHandle ReadSyncOverAsync(int timeoutRemaining, out uint error)
{
SNIHandle handle = Handle;
if (handle == null)
{
throw ADP.ClosedConnectionError();
}
IntPtr readPacketPtr = IntPtr.Zero;
error = SNINativeMethodWrapper.SNIReadSyncOverAsync(handle, ref readPacketPtr, GetTimeoutRemaining());
return(PacketHandle.FromNativePointer(readPacketPtr));
}
private static void ReadDispatcher(IntPtr key, IntPtr packet, uint error)
{
// This is the app-domain dispatcher for all async read callbacks, It
// simply gets the state object from the key that it is passed, and
// calls the state object's read callback.
Debug.Assert(IntPtr.Zero != key, "no key passed to read callback dispatcher?");
if (IntPtr.Zero != key)
{
// NOTE: we will get a null ref here if we don't get a key that
// contains a GCHandle to TDSParserStateObject; that is
// very bad, and we want that to occur so we can catch it.
GCHandle gcHandle = (GCHandle)key;
TdsParserStateObject stateObj = (TdsParserStateObject)gcHandle.Target;
if (null != stateObj)
{
stateObj.ReadAsyncCallback(IntPtr.Zero, PacketHandle.FromNativePointer(packet), error);
}
}
}