Eof 函数

确定文件指针是否到达文件结尾。

语法:


Eof (intexpression As Integer)

返回值:

布尔

参数:

「Intexpression」: 用于计算打开文件的编号的任意整数表达式。

使用 EOF 函数，可以避免在输入时超过文件结尾的错误。当您使用 Input 或 Get 语句读取文件时，文件指针按照所读取的字节数向前移动。到达文件结尾时，EOF 返回 "True" (-1)。

错误代码:

5 无效的过程调用

52 错误的文件名或编号

示例:


  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