в 16:40, 26 мая 2010

2010-05-26T16:40:16Z

Admin: 1 версия

2010-05-26T12:50:12Z

1 версия

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==FileAccess.Read==

<source lang="vbnet">
Imports System
Imports System.IO
Public Class MainClass
Shared Sub Main()
Dim i As Integer
Dim theBytes(255) As Byte
For i = 0 To 255
theBytes(i) = CByte(i)
Next
Dim myFileStream As FileStream
Try
myFileStream = New FileStream("test.txt", FileMode.OpenOrCreate, FileAccess.Write)
myFileStream.Write(theBytes, 0, 256)
Finally
If Not (myFileStream Is Nothing) Then myFileStream.Close()
End Try

Dim theFile As FileStream
Try
theFile = New FileStream("test.txt",FileMode.Open, FileAccess.Read)
For i = 0 To (theFile.Length - 1)
Console.Write(theFile.ReadByte)
Next
Catch e As Exception
Throw e
Finally
If Not (theFile Is Nothing) Then theFile.Close()
End Try
End Sub

End Class

</source>

==FileAccess.Write==

<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>

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VB.Net by API/System.IO/FileAccess - История изменений

в 16:40, 26 мая 2010

Admin: 1 версия