We are trying to extract a PDF Document object from Salesforce.
We've managed to get the document, but seem to be getting stuck with the encoding.
Please see the VB code below.

It does create a PDF file, and it even has the correct number of pages, but all the pages are blank.

Comparing the original PDF file, and the one we are creating and a text editor, we can see the character coding is slightly different:

The 'good' PDF starts with:
%PDF-1.4

%âãÏÓ

The 'bad' one is:
%PDF-1.4

%âã�Ó

We've tried all sorts of decoding but are completely stuck.
Anyone any ideas?

Thanks - Pablo

Public Partial Class pdfSave
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim mySF As New MySalesForce.SforceService

        'Logon to our instance of Salesforce
        Logon(mySF)

        'Get the Document Object
        Dim mySQL As String = "SELECT name, body, BodyLength, Type  FROM Document WHERE id = '015d0000000yxsw'"

        Dim myQueryResult As MySalesForce.QueryResult = mySF.query(mySQL)
        Dim myDoc As MySalesForce.Document = myQueryResult.records(0)

        'Convert the Body form Base64???? to a string
        Dim myStr As String = ""
        For i = 0 To myDoc.BodyLength - 1
            myStr = myStr & Chr(myDoc.Body(i))
        Next

        'Open a file streamwriter (on your desktop - change this for your own desktop)
        Dim myStreamWriter As New System.IO.StreamWriter("C:\Users\JB\Desktop\test.pdf")

        'Write the PDF to the file
        myStreamWriter.Write(myStr)

        myStreamWriter.Close()


    End Sub

    Protected Sub Logon(ByRef paSF As MySalesForce.SforceService)

        Dim myLoginResult As MySalesForce.LoginResult
        Dim myToken As String = ""

        Dim myUsername As String = "pablo@example.com"
        Dim myPassword As String = String.Format("{0}{1}", "pass", "keytoken")

        myLoginResult = paSF.login(myUsername, myPassword)

        paSF.Url = myLoginResult.serverUrl
        paSF.SessionHeaderValue = New MySalesForce.SessionHeader
        paSF.SessionHeaderValue.sessionId = myLoginResult.sessionId

    End Sub

End Class