Lof 函数
返回打开文件的大小，以字节为单位。
Lof (FileNumber)
Long
「FileNumber」: 含有 Open 语句指定的文件编号的任意数字表达式。
要获取未打开的文件的长度，请使用「FileLen」函数。
Sub ExampleRandomAccess
Dim iNumber As Integer
Dim sText As Variant ' 必须是变量
Dim aFile As String
aFile = "C:\Users\ThisUser\data.txt"
iNumber = Freefile
Open aFile For Random As #iNumber Len=32
Seek #iNumber,1 ' 起始位置
Put #iNumber, , "This is the first line of text" ' Fill line with text
Put #iNumber, , "This is the second line of text"
Put #iNumber, , "This is the third line of text"
Seek #iNumber,2
Get #iNumber, , sText
Print sText
Close #iNumber
iNumber = Freefile
Open aFile For Random As #iNumber Len=32
Get #iNumber, 2, sText
Put #iNumber, , "This is a new text"
Get #iNumber, 1, sText
Get #iNumber, 2, sText
Put #iNumber, 20, "This is the text in record 20"
Print Lof(#iNumber)
Close #iNumber
End Sub
Sub ExampleRandomAccess
Dim iNumber As Integer
Dim sText As Variant ' Must be a variant
Dim aFile As String
aFile = "~/data.txt"
iNumber = Freefile
Open aFile For Random As #iNumber Len=32
Seek #iNumber,1 ' Position at beginning
Put #iNumber, , "This is the first line of text" ' Fill line with text
Put #iNumber, , "This is the second line of text"
Put #iNumber, , "This is the third line of text"
Seek #iNumber,2
Get #iNumber, , sText
Print sText
Close #iNumber
iNumber = Freefile
Open aFile For Random As #iNumber Len=32
Get #iNumber, 2, sText
Put #iNumber, , "This is a new text"
Get #iNumber, 1, sText
Get #iNumber, 2, sText
Put #iNumber, 20, "This is the text in record 20"
Print Lof(#iNumber)
Close #iNumber
End Sub