Question

我正在尝试优化一些代码，这些代码会将存储在CSV文件中的某些测试数据进行一些分析并将其数据复制到Excel工作表中。此代码通常一次在数百个测试中运行，每次测试大约需要4.5秒，因此有时可能需要数小时才能完成。

我查找了一些优化技术并将每个测试减少了大约0.25秒，但我认为大部分时间都是由excel占用，因为它必须“打开”各个文件才能对它们执行任何操作。有没有办法更有效地做到这一点？

我愿意接受使用其他语言将文件编译成一个大文件的答案，如果这会让事情变得更快。

Answer 1

我会将它们打开为文本而不是工作簿：

Sub ReadCSV()
    Dim MyString As String
    Open "C:\path\text.csv" For Input As #1 ' Open file for input. 
    Do While Not EOF(1) ' Loop until end of file.
        Line Input #1, MyString ' Read a line into variable
        Debug.Print MyString ' Print data to the Immediate window.
    Loop
    Close #1 ' Close file.

End Sub

这比以工作簿开放

更快

Answer 2

我有这个功能工作greate处理大量的CSV文件。您需要在单元格“D11”中指明包含所有CSV文件的文件夹的名称，并将它们合并为一个文件。我处理了200多个文件并快速完成。希望它有所帮助。

Sub CombineAllFilesInADirectory()
    Dim Path            As String 'string variable to hold the path to look through
    Dim FileName        As String 'temporary filename string variable
    Dim tWB             As Workbook 'temporary workbook (each in directory)
    Dim tWS             As Worksheet 'temporary worksheet variable
    Dim aWS             As Worksheet 'active sheet in master workbook
    Dim RowCount        As Long 'Rows used on master sheet
    Dim uRange          As Range 'usedrange for each temporary sheet
    Dim mWB_comb        As Workbook 'master workbook exclusivo de esta funcion

    Path = Sheets("CombineFiles").Range("D11").Value
    Application.EnableEvents = False 'turn off events
    Application.ScreenUpdating = False 'turn off screen updating
    Set mWB_comb = Workbooks.Add(1) 'create a new one-worksheet workbook
    Set aWS = mWB_comb.ActiveSheet 'set active sheet variable to only sheet in mWB
    If Right(Path, 1) <> Application.PathSeparator Then 'if path doesnt end in "\"
        Path = Path & Application.PathSeparator 'add "\"
    End If
    FileName = Dir(Path & "*.csv", vbNormal) 'set first file's name to filename variable
    Application.StatusBar = "reading files, please wait."
    Do Until FileName = "" 'loop until all files have been parsed
        If Path <> ThisWorkbook.Path Or FileName <> ThisWorkbook.Name Then
            Set tWB = Workbooks.Open(FileName:=Path & FileName) 'open file, set to tWB variable
            For Each tWS In tWB.Worksheets 'loop through each sheet
                Set uRange = tWS.Range("A4", tWS.Cells(tWS.UsedRange.Row + tWS.UsedRange.Rows.count - 1, _
                tWS.UsedRange.Column + tWS.UsedRange.Columns.count - 1)) 'set used range
                If RowCount + uRange.Rows.count > 65536 Then 'if the used range wont fit on the sheet
                    aWS.Columns.AutoFit 'autofit mostly-used worksheet's columns
                    Set aWS = mWB_comb.Sheets.Add(After:=aWS) 'add a new sheet that will accommodate data
                    RowCount = 0 'reset RowCount variable
                End If
                If RowCount = 0 Then 'if working with a new sheet
                    aWS.Range("A1", aWS.Cells(3, uRange.Columns.count)).Value = tWS.Range("A1", _
                    tWS.Cells(3, uRange.Columns.count)).Value 'copy headers from tWS
                    RowCount = 3 'add one to rowcount
                End If
                aWS.Range("A" & RowCount + 1).Resize(uRange.Rows.count, _
                uRange.Columns.count).Value = uRange.Value 'move data from temp sheet to data sheet
                RowCount = RowCount + uRange.Rows.count 'increase rowcount accordingly
            Next 'tWS
            tWB.Close False 'close temporary workbook without saving
        End If
        FileName = Dir() 'set next file's name to FileName variable
    Loop
    Application.StatusBar = "Ready"
    mWB_comb.Sheets(1).Select 'select first data sheet on master workbook
   Application.EnableEvents = True 're-enable events
    Application.ScreenUpdating = True 'turn screen updating back on
     'Clear memory of the object variables
    Set tWB = Nothing
    Set tWS = Nothing
    Set mWB_comb = Nothing
    Set aWS = Nothing
    Set uRange = Nothing
End Sub

操作/复制.CSV数据，无需打开文件？

2 个答案: