From: "Premjeet Singh H." <premjeetsinghhora@...>
Date: 2011-07-30T19:12:50+09:00
Subject: How to read/write from ruby to VB.Net application and vice versa using Memory Mapped Files?

We are trying to communicate between our two applications, One is in
VB.Net and the other one is in ruby.How to communicate between a ruby
and .Net application?

Below is a sample code written to create a Memory Mapped File in VB.Net



 Public Shared Sub WriteData()

        Try

            'String to write in memory

            Dim str As String = "This is a test data for Non-Persisted
Memory Mapped File."

            Dim bytes As Byte()



            'Convert the string to bytes

            bytes = StrToByteArray(str)



            'To store all bytes with length of bytes at 0 position

            Dim bytesnew = New Byte(bytes.Length) {}



            'Storing the length at first(0) position

            bytesnew(0) = bytes.Length



            'Copying all the bytes after the length

            For i As Integer = 1 To bytes.Length

                bytesnew(i) = bytes(i - 1)

            Next



            'Calculating the size of file with 1 extra byte for storing
length of bytes.

            Dim filesize As Integer = bytes.Length + 1



            'Creating a new file in memory

            Using file = MemoryMappedFile.CreateNew("myFile", filesize)



                'Creating a accessor that maps to the view of memory
mapped file(MMF)

                Using writer = file.CreateViewAccessor(0, filesize)

                    'Writing the bytes in memory

                    writer.WriteArray(Of Byte)(0, bytesnew, 0, filesize)

                End Using

                MsgBox("File written in memory, Now read file without
clicking OK button.")



                'MMF will get automatically disposed after this line due
to using statement.

            End Using

        Catch ex As Exception

            MsgBox(ex.ToString)

        End Try

    End Sub



 ' VB.NET to convert a string to a byte array

    Public Shared Function StrToByteArray(ByVal str As String) As Byte()

        Dim ByteArr As Byte() = Nothing

        Try

            Dim encoding As New System.Text.UTF8Encoding

            ByteArr = encoding.GetBytes(str)

        Catch ex As Exception

            MsgBox(ex.ToString)

        End Try

        Return ByteArr

    End Function



After creating the Memory Mapped File through the above code how can we
read/write it in ruby?



Any help will be greatly appreciated.



Regards, Premjeet Singh

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