Esempio n. 1
0
        //====================================================================
        // Read value from marshaled object (marshaled using AsAny)
        // It's quite slow and can return back dangling pointers
        // It's only there for backcompact
        // People should instead use the IntPtr overloads
        //====================================================================
        private static unsafe T ReadValueSlow <T>(object ptr, int ofs, Func <IntPtr, int, T> readValueHelper)
        {
            // Consumers of this method are documented to throw AccessViolationException on any AV
            if (ptr == null)
            {
                throw new AccessViolationException();
            }

            const int Flags =
                (int)AsAnyMarshaler.AsAnyFlags.In |
                (int)AsAnyMarshaler.AsAnyFlags.IsAnsi |
                (int)AsAnyMarshaler.AsAnyFlags.IsBestFit;

            MngdNativeArrayMarshaler.MarshalerState nativeArrayMarshalerState = new MngdNativeArrayMarshaler.MarshalerState();
            AsAnyMarshaler marshaler = new AsAnyMarshaler(new IntPtr(&nativeArrayMarshalerState));

            IntPtr pNativeHome = IntPtr.Zero;

            try
            {
                pNativeHome = marshaler.ConvertToNative(ptr, Flags);
                return(readValueHelper(pNativeHome, ofs));
            }
            finally
            {
                marshaler.ClearNative(pNativeHome);
            }
        }
Esempio n. 2
0
        /// <summary>
        /// Write value into marshaled object (marshaled using AsAny) and propagate the
        /// value back. This is quite slow and can return back dangling pointers. It is
        /// only here for backcompat. People should instead use the IntPtr overloads.
        /// </summary>
        private static unsafe void WriteValueSlow <T>(object ptr, int ofs, T val, Action <IntPtr, int, T> writeValueHelper)
        {
            // Consumers of this method are documented to throw AccessViolationException on any AV
            if (ptr is null)
            {
                throw new AccessViolationException();
            }

            const int Flags =
                (int)AsAnyMarshaler.AsAnyFlags.In |
                (int)AsAnyMarshaler.AsAnyFlags.Out |
                (int)AsAnyMarshaler.AsAnyFlags.IsAnsi |
                (int)AsAnyMarshaler.AsAnyFlags.IsBestFit;

            MngdNativeArrayMarshaler.MarshalerState nativeArrayMarshalerState = default;
            AsAnyMarshaler marshaler = new AsAnyMarshaler(new IntPtr(&nativeArrayMarshalerState));

            IntPtr pNativeHome = IntPtr.Zero;

            try
            {
                pNativeHome = marshaler.ConvertToNative(ptr, Flags);
                writeValueHelper(pNativeHome, ofs, val);
                marshaler.ConvertToManaged(ptr, pNativeHome);
            }
            finally
            {
                marshaler.ClearNative(pNativeHome);
            }
        }