邯郸化妆学校哪个好:VB中操作文本文件的处理实例

'功能：删除、替换文本中一行，或者插入内容到文本中某一行
'作者: soho_andy (冰)
'参数：
'strSourceFile 原始文件完整名
'strTargetFile 生成新文件的完整名
'intRow 操作的行数

Sub 操作文件中一行(strSourceFile As String, strTargetFile As String, intRow As Long)
Dim filenum As Integer
Dim fileContents As String
Dim fileInfo() As String
Dim i As Integer
Dim j As Integer

filenum = FreeFile
Open strSourceFile For Binary As #filenum
fileContents = Space(LOF(filenum))
Get #filenum, , fileContents
Close filenum
fileInfo = Split(fileContents, vbCrLf)
'取出源文件行数，按照回车换行来分隔成数组

filenum = FreeFile
If Dir(strTargetFile, vbNormal) <> "" Then
Kill strTargetFile
End If
Dim Filestr() As String

'删除一行代码块
Open strTargetFile For Append As #filenum
'循环每一行
For i = 0 To UBound(fileInfo) - 1
If i <> intRow - 1 Then
Print #filenum, fileInfo(i)
End If
Next
Close #filenum

'替换一行代码块
Open strTargetFile For Append As #filenum
'循环每一行
For i = 0 To UBound(fileInfo) - 1
If i = intRow - 1 Then
Print #filenum, "你要替换进去的内容"
End If
Next
Close #filenum

'插入一行代码块
Open strTargetFile For Append As #filenum
'循环每一行
For i = 0 To UBound(fileInfo) - 1
If i = intRow - 1 Then
Print #filenum, "你要插入到这行的内容"
Print #filenum, fileInfo(i) '保留原来的行，位置后移一位
End If
Next
Close #filenum

MsgBox "完毕"
End Sub

'另外一个解决实际问题的例子
'
'网友的要求
'设有文件a.txt，其中存放了两行数据，数据用逗号分隔，现在要读取第一行的奇数位置的数据写入到另一个文本文件（b.txt）的第一行，类似地，把第二行的奇数位置的数据写入到第二行。
'比如:
'文件a.txt如下:
'1，2，3，4，5
'6，7，8，9，10
'操作完成后，文件b.txt应为
'1,3,5
'6,8,10

'作者: soho_andy (冰)
'参数：
'strSourceFile 原始文件完整名
'strTargetFile 生成新文件的完整名

Sub 提取奇数位数据(strSourceFile As String, strTargetFile As String)
Dim filenum As Integer
Dim fileContents As String
Dim fileInfo() As String
Dim i As Integer
Dim j As Integer

Dim tmpDemData As String
filenum = FreeFile
Open strSourceFile For Binary As #filenum
fileContents = Space(LOF(filenum))
Get #filenum, , fileContents
Close filenum
fileInfo = Split(fileContents, vbCrLf)
'取出源文件行数，按照回车换行来分隔成数组

filenum = FreeFile
tmpDemData = ""
If Dir(strTargetFile, vbNormal) <> "" Then
Kill strTargetFile
End If
Dim Filestr() As String

Open strTargetFile For Append As #filenum
'循环每一行
For i = 0 To UBound(fileInfo) - 1
Filestr = Split(Trim(fileInfo(i)), ",") '按照逗号分隔每一行的数据
tmpDemData = ""
For j = 0 To UBound(Filestr)
'判断是否为奇数位
If (j Mod 2) = 0 Then
tmpDemData = tmpDemData & Filestr(j)
ElseIf j <> 0 And j <> UBound(Filestr) Then
tmpDemData = tmpDemData & ","
End If
Next
'保存一行如目标文件
Print #filenum, tmpDemData
Next
Close #filenum
MsgBox "完毕"
End Sub

Private Sub Command1_Click()
提取奇数位数据 "d:\aa.txt", "d:\bb.txt"
End Sub