[VB.NET]Comment lire nombre déterminé caractères du Fichier?

Il te faut en fait utiliser la Classe BinaryReader qui propose cette fonctionnalités avec sa Méthode ReadChars

Code:

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Imports System
Imports System.IO
Imports System.Text
'...
Public Sub Read(ByVal filePath As String, ByVal count As Integer)
    Dim br As BinaryReader = Nothing
    Dim extract() As Char
    Dim fs As FileStream = Nothing
 
    Try
       fs = New FileStream(filePath)
       br = New BinaryReader(fs, Encoding.Default)
       With br
          While .Peek > -1
              extract = .ReadChars(count)
              '...traiter extract()
          End With
       End With
    Catch ex As Exception
       '...traiter ex.Message
    Finally
       If Not(br Is Nothing) Then br.Close()
    End Try
End Sub