IStream.cs

namespace System.Runtime.InteropServices.ComTypes
{
    [ComImport]
    [Guid("0000000c-0000-0000-C000-000000000046")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [__DynamicallyInvokable]
    public interface IStream
    {
        void Read([Out] [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] byte[] pv, int cb, IntPtr pcbRead);

        void Write([MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] byte[] pv, int cb, IntPtr pcbWritten);

        void Seek(long dlibMove, int dwOrigin, IntPtr plibNewPosition);

        [__DynamicallyInvokable]
        void SetSize(long libNewSize);

        void CopyTo(IStream pstm, long cb, IntPtr pcbRead, IntPtr pcbWritten);

        [__DynamicallyInvokable]
        void Commit(int grfCommitFlags);

        [__DynamicallyInvokable]
        void Revert();

        [__DynamicallyInvokable]
        void LockRegion(long libOffset, long cb, int dwLockType);

        [__DynamicallyInvokable]
        void UnlockRegion(long libOffset, long cb, int dwLockType);

        [__DynamicallyInvokable]
        void Stat(out STATSTG pstatstg, int grfStatFlag);

        [__DynamicallyInvokable]
        void Clone(out IStream ppstm);
    }
}