1.首先我们来学习一下基本的文件操作
（1）写入代码
Sub print写入()
'Open ThisWorkbook.Path & "\text.txt" For Append As #1'追加写入
Open ThisWorkbook.path & "\text.txt" For Output As #1 '写入的文件每次会被覆盖
Print #1, "谭可", "234454" '会自动添加空格
Print #1, "谭可"; "234454" '紧接前面的数据写入
Print #1, '写入空行
Close #1
MsgBox "写入成功"
End Sub
或者用write写入，这两种方式有点区别，具体差别在哪里，可以自己运行试试看
Sub write写入()
Open ThisWorkbook.path & "\text.txt" For Output As #1
Write #1, "谭可", "234454" '会自动添加双引号和逗号
Close #1
MsgBox "写入成功"
End Sub
（2）读取数据（这里提供两种方法，都可以读取文件）
Sub lineinput读取()
Dim filename As String
filename = ThisWorkbook.path & "\sdd.txt"
Open filename For Input As #1
Dim str As String, s As String
Do While Not EOF(1) 'EOF(文件号），判断是否达到文件末尾
Line Input #1, str
s = s & str
Loop
Close #1
MsgBox s
End Sub
Sub input读取()
Dim filename As String
filename = ThisWorkbook.path & "\sdd.txt"
Open filename For Input As #1
Dim s As String
Do While Not EOF(1)
s = s & Input(1, 1) 'input(读取字符数，文件号）
Loop
Close #1
MsgBox s
End Sub
2.类的封装（将文件操作写成类，可以直接调用里面的方法，提高编程效率）
Option Explicit
'写入 optional 表示可选参数，意思就是调用的时候，该参数可以传入，也可以不传入
Sub writealltext(filename As String, str As String, Optional appendornot As Boolean = False)
Dim number As Integer
number = FreeFile
If appendornot Then
Open filename For Append As #number '追加方式打开文件
Else
Open filename For Output As #number '覆盖方式打开文件
End If
Print #number, str;
Close #number '关闭
End Sub
'读取所有行，返回字符串数组
Function readalllines(filename As String) As String()
Dim arr() As String, k As Integer, number As Integer
number = FreeFile
Open filename For Input As #number '打开文件
Do While Not EOF(number)
'建议把数据做成“步进式扩容”
k = k + 1
ReDim Preserve arr(1 To k) As String
Line Input #number, arr(k)
Loop
Close #number
readalllines = arr
End Function
Function readalltext(filename As String) As String
Dim number As Integer, s As String
number = FreeFile '产生一个当前可用的最小文件号
Open filename For Input As #number '打开文件
Do While Not EOF(number) '循环读取
s = s & Input(1, number)
Loop
Close #number '关闭
readalltext = s
End Function
3.调用的方法也很简单
Option Explicit
Sub 测试()
Dim file As New clsfile
Dim path As String
path = ThisWorkbook.path & "\text.txt"
MsgBox file.readalltext(path)
Dim arr() As String
arr = file.readalllines(path)
file.writealltext path, "我爱你"
End Sub
4.可以将文件操作的方法进行完善，后面可以直接使用