是否存在COM互操作IStream的包装类？

我即将为COM互操作IStream编写一个包装器，以便需要标准.NET Stream的代码可以使用它。

然而，我发现这种事情之前可能已经完成了（尽管我自己无法通过网络搜索找到它）。

所以我只是把它放在这里，以防我即将重新发明轮子。

注意我遇到过实现包含.NET流的IStream的代码，但我需要反过来。

Answer 1

它确实是System.Runtime.InteropServices.ComTypes.IStream 。 样本包装：

using System; using iop = System.Runtime.InteropServices; using System.Runtime.InteropServices.ComTypes; public class ComStreamWrapper : System.IO.Stream { private IStream mSource; private IntPtr mInt64; public ComStreamWrapper(IStream source) { mSource = source; mInt64 = iop.Marshal.AllocCoTaskMem(8); } ~ComStreamWrapper() { iop.Marshal.FreeCoTaskMem(mInt64); } public override bool CanRead { get { return true; } } public override bool CanSeek { get { return true; } } public override bool CanWrite { get { return true; } } public override void Flush() { mSource.Commit(0); } public override long Length { get { STATSTG stat; mSource.Stat(out stat, 1); return stat.cbSize; } } public override long Position { get { throw new NotImplementedException(); } set { throw new NotImplementedException(); } } public override int Read(byte[] buffer, int offset, int count) { if (offset != 0) throw new NotImplementedException(); mSource.Read(buffer, count, mInt64); return iop.Marshal.ReadInt32(mInt64); } public override long Seek(long offset, System.IO.SeekOrigin origin) { mSource.Seek(offset, (int)origin, mInt64); return iop.Marshal.ReadInt64(mInt64); } public override void SetLength(long value) { mSource.SetSize(value); } public override void Write(byte[] buffer, int offset, int count) { if (offset != 0) throw new NotImplementedException(); mSource.Write(buffer, count, IntPtr.Zero); } }