Convert RTF to HTML using MemoryStream
in C# and VB.Net.


Complete code 

using System;
using System.IO;
using System.Text;

namespace Sample
{
    class sample
    {
        static void Main(string[] args)
        {
            // We'll use the files only for the demonstration, 
            // the whole conversion will be done using MemoryStream.
            string inpFile = @"..\..\example.rtf";
            string outFile = @"Result.html";

            SautinSoft.RtfToHtml r = new SautinSoft.RtfToHtml();

            // Specify some properties for output HTML document.
            r.OutputFormat = SautinSoft.RtfToHtml.eOutputFormat.HTML_5;
            r.Encoding = SautinSoft.RtfToHtml.eEncoding.UTF_8;

            // Imagefolder must already exist.
            r.ImageStyle.ImageFolder = System.Environment.CurrentDirectory;

            // Subfolder for images will be created by the component.
            r.ImageStyle.ImageSubFolder = "image.files";

            // A template name for images.
            r.ImageStyle.ImageFileName = "picture";

            // false - store images as files on HDD,
            // true - store images inside HTML document using base64.
            r.ImageStyle.IncludeImageInHtml = false;

            try
            {
                using (FileStream rtfFileStream = new FileStream(inpFile, FileMode.Open))
                {
                    r.OpenRtf(rtfFileStream);
                    using (MemoryStream htmlMemoryStream = new MemoryStream())
                    {
                        // Here we've got the HTML document as an array of bytes.
                        r.ToHtml(htmlMemoryStream);

                        // Save our HTML into file and open it for the demonstration purposes.
                        File.WriteAllBytes(outFile, htmlMemoryStream.ToArray());
                        System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile)
                        { UseShellExecute = true });
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine($"Error: {e.Message}");
                Console.WriteLine("Press any key ...");
                Console.ReadKey();
            }
        }
    }
}

Download.

        
            Imports System
Imports System.IO
Imports System.Text

Namespace Sample
    Friend Class sample
        Shared Sub Main(ByVal args() As String)
            ' We'll use the files only for the demonstration, 
            ' the whole conversion will be done using MemoryStream.
            Dim inpFile As String = "..\..\example.rtf"
            Dim outFile As String = "Result.html"

            Dim r As New SautinSoft.RtfToHtml()

            ' Specify some properties for output HTML document.
            r.OutputFormat = SautinSoft.RtfToHtml.eOutputFormat.HTML_5
            r.Encoding = SautinSoft.RtfToHtml.eEncoding.UTF_8

            ' Imagefolder must already exist.
            r.ImageStyle.ImageFolder = Environment.CurrentDirectory

            ' Subfolder for images will be created by the component.
            r.ImageStyle.ImageSubFolder = "image.files"

            ' A template name for images.
            r.ImageStyle.ImageFileName = "picture"

            ' false - store images as files on HDD,
            ' true - store images inside HTML document using base64.
            r.ImageStyle.IncludeImageInHtml = False

            Try
                Using rtfFileStream As New FileStream(inpFile, FileMode.Open)
                    r.OpenRtf(rtfFileStream)
                    Using htmlMemoryStream As New MemoryStream()
                        ' Here we've got the HTML document as an array of bytes.
                        r.ToHtml(htmlMemoryStream)

                        ' Save our HTML into file and open it for the demonstration purposes.
                        File.WriteAllBytes(outFile, htmlMemoryStream.ToArray())
                        System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outFile) With {.UseShellExecute = True})
                    End Using
                End Using
            Catch e As Exception
                Console.WriteLine($"Error: {e.Message}")
                Console.WriteLine("Press any key ...")
                Console.ReadKey()
            End Try
        End Sub
    End Class
End Namespace

Download.

If you are looking also for a .Net solution to Create or Modify HTML documents, see our Document .Net.

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