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      • vb.net教程之二進制文件的讀寫操作

      • 2015-01-18 13:40 來源:未知
      二進制文件的讀寫操作(相關vb.net教程)
      二進制文件的打開也用fileopen完成,只是打開二進制文件的形式為:openmode.binary
      讀取二進制文件用的是fileget方法,寫入二進制文件用的是fileput方法。
      應用實例:將一批隨機數保存在一個dat文件中,然后再將其提取到文本框中。[實驗報告 39]
      見,二進制文件的讀寫一批隨機數的存取,程序為:
      Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
              Dim x, i, fn As Integer
              Dim s As String = ""
              fn = FreeFile()
              FileOpen(fn, "d:\data.dat", OpenMode.Binary)
              For i = 1 To 8
                  x = Int(Rnd() * 100)
                  s = s + Str(x)
                  FilePut(fn, x)
              Next
              FileClose(fn)
              TextBox1.Text = s
          End Sub
       
          Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
              Dim x, fn As Integer
              Dim s As String = ""
              fn = FreeFile()
              FileOpen(fn, "d:\data.dat", OpenMode.Binary)
              Do While Not EOF(fn)
                  FileGet(fn, x)
                  s = s + Str(x) + " "
              Loop
              FileClose(fn)
              TextBox1.Text = s
          End Sub
      說明:此時形成的文件data.dat如果打開查看,內容是亂碼。因為它是以二進制的形式存放的。即使將文件名換成da.txt,結果也是一樣不能查看內容。
      應用實例:演示二進制文件以字節為單位的復制過程。[實驗報告 40]
      見,二進制文件以字節為單位的復制過程,程序為:
      Public Class Form1
          Dim s As String
          Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
              OpenFileDialog1.ShowDialog()
              s = OpenFileDialog1.FileName
              TextBox1.Text = s
          End Sub
       
          Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
              Dim fa, fb As String
              Dim a, b, len, k As Integer
              Dim byt As Byte
              ' Try
              fa = TextBox1.Text : fb = TextBox2.Text
              a = FreeFile()
              FileOpen(a, fa, OpenMode.Binary)
              b = FreeFile()
              FileOpen(b, fb, OpenMode.Binary)
              len = LOF(a)
              For k = 1 To len
                  FileGet(a, byt)
                  FilePut(b, byt)
                  ProgressBar1.Value = 100 * k \ len
              Next
              FileClose(a)
              FileClose(b)
              ss = "文件復制完成!" & "文件長度為:" & len & "字節"
              MsgBox(ss, 16, "注意")      
       End
              'Catch ex As Exception
              'MsgBox(ex.Message, MsgBoxStyle.OkOnly, "error")
              ' End Try
          End Sub
      End Class
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