VB.Net/File Directory/Binary File Read

Check Files Are Identical

<source lang="vbnet"> Public Class MainClass

   Public Shared Function CompareFiles(ByVal File1 As String, ByVal File2 As String) As Boolean
       Dim blnIdentical As Boolean = True
       Dim objFS1 As System.IO.FileStream = New System.IO.FileStream(File1, System.IO.FileMode.Open)
       Dim objFS2 As System.IO.FileStream = New System.IO.FileStream(File2, System.IO.FileMode.Open)
       If (objFS1.Length <> objFS2.Length) Then
           blnIdentical = False
       Else
           Dim intByteF1 As Integer
           Dim intByteF2 As Integer
           Do
               intByteF1 = objFS1.ReadByte()
               intByteF2 = objFS2.ReadByte()
               If intByteF1 <> intByteF2 Then
                   blnIdentical = False
                   Exit Do
               End If
           Loop While (intByteF1 <> -1)
       End If
       objFS1.Close()
       objFS2.Close()
       Return blnIdentical
   End Function
   Public Shared Sub Main()
       If CompareFiles("1.jpg", "2.bmp") Then
           System.Console.WriteLine("Files are identical!")
       Else
           System.Console.WriteLine("Files do not match!")
       End If
   End Sub

End Class

 </source>

Read and Write Binary file: int, string

<source lang="vbnet"> Imports System.IO Module Module1

   Sub Main()
       Dim Stream As FileStream
       Try
           Stream = New FileStream("test.dat", FileMode.Create)
       Catch E As Exception
           Console.WriteLine("Error creating test.Dat")
           Console.WriteLine("Error {0}", E.Message)
       End Try
       Dim BinaryStream As New BinaryWriter(Stream)
       Dim Age As Integer = 21
       Dim Salary As Double = 100000.0
       Dim Name As String = "Joe"
       Try
           BinaryStream.Write(Age)
           BinaryStream.Write(Salary)
           BinaryStream.Write(Name)
           BinaryStream.Close()
           Console.WriteLine("Data written to test.Dat")
       Catch E As Exception
           Console.WriteLine("Error writing to test.Dat")
           Console.WriteLine("Error {0}", E.Message)
       End Try
       
       "Read 
       
       Try
           Stream = New FileStream("test.dat", FileMode.Open)
       Catch E As Exception
           Console.WriteLine("Error opening test.Dat")
           Console.WriteLine("Error {0}", E.Message)
       End Try
       Dim BinaryStreamReader As New BinaryReader(Stream)
       Try
           Age = BinaryStreamReader.ReadInt32()
           Salary = BinaryStreamReader.ReadDouble()
           Name = BinaryStreamReader.ReadString()
           BinaryStreamReader.Close()
           Console.WriteLine("Age: {0}", Age)
           Console.WriteLine("Salary: {0}", Salary)
           Console.WriteLine("Name: {0}", Name)
       Catch E As Exception
           Console.WriteLine("Error reading to test.Dat")
           Console.WriteLine("Error {0}", E.Message)
       End Try
   End Sub

End Module

 </source>

Read from a binary file

<source lang="vbnet"> Imports System Imports System.IO Imports System.Windows.Forms Public Class MainClass

  Shared Sub Main()
       Dim emp As New Employee
       Dim file_num As Integer = FreeFile()
       FileOpen(file_num, "MYFILE.DAT", OpenMode.Random, _
            OpenAccess.ReadWrite, OpenShare.Shared, _
            Len(emp))
       FilePut(file_num, New Employee(1, "A", "A"))
       FilePut(file_num, New Employee(2, "B", "B"))
       FilePut(file_num, New Employee(3, "C", "C"))
       FilePut(file_num, New Employee(4, "D", "D"))
       FilePut(file_num, New Employee(5, "E", "E"))
       FilePut(file_num, New Employee(6, "F", "F"))
       Dim obj As ValueType = DirectCast(emp, ValueType)
       For Each i As Integer In New Integer() {3, 1, 5, 2, 6}
           FileGet(file_num, obj, i)
           emp = DirectCast(obj, Employee)
           Console.WriteLine(emp.ToString())
       Next i
       " Close the file.
       FileClose(file_num)
  End Sub 

End Class

   Public Structure Employee
       Public ID As Integer
       <VBFixedString(15)> Public FirstName As String
       <VBFixedString(15)> Public LastName As String
       Public Sub New(ByVal new_id As Integer, ByVal first_name As String, _
        ByVal last_name As String)
           ID = new_id
           FirstName = first_name
           LastName = last_name
       End Sub
       Public Overrides Function ToString() As String
           Return ID & ": " & FirstName & " " & LastName
       End Function
   End Structure
          
        
 </source>

Reading a sequential-access file

<source lang="vbnet"> Imports System.IO Imports System.Collections Imports System.Windows.Forms Imports System.Runtime.Serialization.Formatters.Binary Imports System.Runtime.Serialization Public Class MainClass

  Public Shared Sub Main()
        Dim formatter As BinaryFormatter = New BinaryFormatter()
        Dim output As FileStream
        Dim fileName As String = "test.dat"
        Dim employee As Employee = New Employee("First Name", "Last Name")
        Try
           output = New FileStream(fileName,FileMode.OpenOrCreate, FileAccess.Write)
 
           formatter.Serialize(output, employee)
           output.Close()
 
        Catch fileException As FileNotFoundException
           Console.WriteLine("File Does Not Exits")
        Catch serializableException As SerializationException
           Console.WriteLine("Error Writing to File")
        Catch formattingException As FormatException
           Console.WriteLine("Invalid Format")
        Catch e As IOException
           Console.WriteLine("Cannot close file")
        End Try

        Dim input As FileStream
        Dim reader As BinaryFormatter = New BinaryFormatter()
        input = New FileStream(fileName, FileMode.Open,FileAccess.Read)
        Try
            Dim em As Employee = CType(reader.Deserialize(input), Employee)
        
            Console.WriteLine(em)
        Catch serializableException As SerializationException
            input.Close() 
            Console.WriteLine("No more records in file")
        End Try
  End Sub

End Class <Serializable()> Public Class Employee

  Private firstName, lastName As String
  Public Sub New(ByVal first As String, ByVal last As String)
     firstName = first
     lastName = last
  End Sub 
  Public Overrides Function ToString() As String
     Return firstName & " " & lastName
  End Function 

End Class

 </source>