Hello,

I am using VS 2008 C# Windows Application.

I have this DLL Import I am trying to use.

[DllImport("Mapi32.dll", PreserveSig = true)]
private static extern void
WrapCompressedRTFStream(
[MarshalAs(UnmanagedType.Interface)]
UCOMIStream lpCompressedRTFStream,
uint ulflags,
[MarshalAs(UnmanagedType.Interface)]
out UCOMIStream lpUncompressedRTFStream
);

public const uint MAPI_MODIFY = 0x00000001;
public const uint STORE_UNCOMPRESSED_RTF = 0x00008000;

I have a compressed string that is in CompressedRFTFormat.

How do I pass the string into the WrapCompressedRTFStream? I do not understand what the method is expecting.

I am trying to use it on a button.

RichText1.text = WrapCompressedRTFStream(_CompressedRichText.ToString(),something,somethingelse);

The first error I get is "cannot convert from 'string' to 'System.Runtime.InteropServices.UCOMIStream"

I hope someone who understands this posts an answer that helps!