Eof Function

確定檔案指標是否到達檔案的結尾。

Syntax:


Eof (intexpression As Integer)

Return value:

布林型

Parameters:

Intexpression：任意整型表示式，用於演算開啟著的檔案之編號。

使用 EOF 函式以避免嘗試超過檔案結尾輸入的錯誤。當您使用 Input 或 Get 陳述式讀取檔案時，檔案指標按照所讀取的位元組數向前移動。到達檔案結尾時，EOF 函式將傳回「True (真)」(-1)。

錯誤代碼：

5 無效的程序呼叫

52 錯誤的檔案名稱或檔案編號

Example:


  Sub ExampleWorkWithAFile
      Dim iNumber As Integer
      Dim sLine As String
      Dim aFile As String
      Dim sMsg As String
      aFile = "C:\Users\ThisUser\data.txt"
      iNumber = Freefile
      Open aFile For Output As #iNumber
      Print #iNumber, "This is a line of text"
      Print #iNumber, "This is another line of text"
      Close #iNumber
      iNumber = Freefile
      Open aFile For Input As iNumber
      While Not eof(iNumber)
          Line Input #iNumber, sLine
          If sLine <>"" Then
              sMsg = sMsg & sLine & chr(13)
          End If
      Wend
      Close #iNumber
      MsgBox sMsg
  End Sub


  Sub ExampleWorkWithAFile
      Dim iNumber As Integer
      Dim sLine As String
      Dim aFile As String
      Dim sMsg As String
      aFile = "~/data.txt"
      iNumber = Freefile
      Open aFile For Output As #iNumber
      Print #iNumber, "This is a line of text"
      Print #iNumber, "This is another line of text"
      Close #iNumber
      iNumber = Freefile
      Open aFile For Input As iNumber
      While Not eof(iNumber)
          Line Input #iNumber, sLine
          If sLine <>"" Then
              sMsg = sMsg & sLine & chr(13)
          End If
      Wend
      Close #iNumber
      MsgBox sMsg
  End Sub