VBA向CSV文件添加行

问题描述

我搜索了很多，但大多数结果都是与EXCEL相关的。所以我找不到任何关于我答案的线索。

我正在尝试由MS Access2010执行此操作：

我有几个头在第一行的CSV文件。所有字段均以分隔，且均为字符串(双引号中有多个)。

我不知道每个CSV文件中有多少列。我要在第一行(标题)和第二行之间插入新行。

如何找出CSV文件有多少列？如何在第二行追加新文本行？

推荐答案

FileSystemObject是执行以下任务的优秀工具：

Public Function InsertLine()

    Const TmpExtension      As String = ".tmp"
    Const BakExtension      As String = ".bak"

    Dim FileSystemObject    As Scripting.FileSystemObject
    Dim SourceStream        As Scripting.TextStream
    Dim TargetStream        As Scripting.TextStream

    Dim Fields              As Variant
    Dim Values              As Variant
    Dim FieldCount          As Long
    Dim Item                As Long
    Dim Field               As String
    Dim FileName            As String
    Dim BaseName            As String
    Dim TempFileName        As String
    Dim Path                As String
    Dim Extension           As String
    Dim DotExtension        As String
    Dim TextLine            As String

    Set FileSystemObject = New Scripting.FileSystemObject

    ' File to modify.
    FileName = "c:	est	imezone.csv"

    BaseName = FileSystemObject.GetBaseName(FileName)
    Extension = FileSystemObject.GetExtensionName(FileName)
    Path = FileSystemObject.GetParentFolderName(FileName)
    DotExtension = "." & Extension
    TempFileName = BaseName & TmpExtension

    Set SourceStream = FileSystemObject.OpenTextFile(FileName, ForReading)
    Set TargetStream = FileSystemObject.CreateTextFile(TempFileName, ForWriting)

    ' Read header line.
    TextLine = SourceStream.ReadLine
    ' Copy header line.
    TargetStream.WriteLine TextLine

    ' Create line two.
    Fields = Split(TextLine, ",")
    ' FYI.
    FieldCount = UBound(Fields)
    ' Array to hold values.
    Values = Fields
    For Item = LBound(Fields) To UBound(Fields)
        Select Case Item
            Case 0
                Field = "SomeValue"
            Case 1
                Field = "OtherValue"
            Case 2
                Field = "YetAValue"
            ' etc.
            Case Else
                Field = CStr(Item)
        End Select
        Values(Item) = Chr(34) & Field & Chr(34)
    Next
    ' Write line two.
    TargetStream.WriteLine Join(Values, ",")

    ' Copy remaining lines.
    While Not SourceStream.AtEndOfStream
        TargetStream.WriteLine SourceStream.ReadLine
    Wend
    ' Close files.
    SourceStream.Close
    TargetStream.Close

    ' Rename files.
    FileSystemObject.MoveFile FileName, FileSystemObject.BuildPath(Path, BaseName & BakExtension)
    FileSystemObject.MoveFile TempFileName, FileSystemObject.BuildPath(Path, BaseName & DotExtension)

End Function

需要将引用设置为：Microsoft.Scripting.Runtime

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