VBA宏内存泄漏(如何清除变量=

Question

我有一个VBA宏脚本,可以删除一些数据.它使用MSIE来刮擦它.我相信MSIE是内存泄漏的核心问题.

我正在初始化变量

Set IE = CreateObject("InternetExplorer.Application")

我做了一点测试,看看内存是如何使用的.

我创建了一个循环,它只生成1个IE实例并ping同一个网站.记忆似乎没有韭菜.

然后我做了一个循环,总是ping不同的站点,内存使用开始随着每个请求而增加.

我还做了一个测试(我在下面发布),在每次迭代中创建NEW对象并在最后删除它.删除部分似乎不起作用.

似乎IE的实例正在缓存请求,因此对象变得越来越大.这只是一个假设.

这是我用来测试泄漏的示例代码.

Do While True
    Dim IE As Object
    Set IE = CreateObject("InternetExplorer.Application")

    IE.Navigate "https://www.google.hr/#hl=hr&gs_nf=1&cp=3&gs_id=8&xhr=t&q=" & Counter
    IE.Visible = True

    Do While IE.readyState <> 4 Or IE.Busy = True
        Application.Wait Now() + TimeValue("00:00:01")
        DoEvents
    Loop

    Application.Wait Now() + TimeValue("00:00:01")
    Counter = Counter + 1
    Range("A" & Counter).Value = "https://www.google.hr/#hl=hr&gs_nf=1&cp=3&gs_id=8&xhr=t&q=" & Counter

    IE.Quit
    Set IE = Nothing
Loop

任何输入都会很棒!

Answer 1

我测试了上面的代码,它正在破坏IE对象.也就此而言

似乎IE的实例正在缓存请求,因此对象变得越来越大.这只是一个假设.

是的它有时会增加但不总是.见截图.

这是IE for 8循环的任务管理器的屏幕截图.它显示出增加,但如果你看到它也会降低它.所以我相信你所看到的不是内存泄漏.

编辑

这是我在我的数据库中的一些代码(我没有写它)但你可以运行它来检查内存使用情况.

Sub Sample()
    Do While True
        Dim IE As Object
        Set IE = CreateObject("InternetExplorer.Application")

        IE.Navigate "https://www.google.hr/#hl=hr&gs_nf=1&cp=3&gs_id=8&xhr=t&q=" & Counter
        IE.Visible = False

        Debug.Print GetProcessMemory("iexplore.exe")

        Do While IE.readyState <> 4 Or IE.Busy = True
            Application.Wait Now() + TimeValue("00:00:01")
            DoEvents
        Loop

        Application.Wait Now() + TimeValue("00:00:01")
        Counter = Counter + 1
        Range("A" & Counter).value = "https://www.google.hr/#hl=hr&gs_nf=1&cp=3&gs_id=8&xhr=t&q=" & Counter

        IE.Quit
        Set IE = Nothing
    Loop
End Sub

Private Function GetProcessMemory(ByVal app_name As String) As String
    Dim Process As Object, dMemory As Double

    For Each Process In GetObject("winmgmts:"). _
    ExecQuery("Select WorkingSetSize from Win32_Process Where Name = '" & app_name & "'")
        dMemory = Process.WorkingSetSize
    Next
    If dMemory > 0 Then
        GetProcessMemory = ResizeKb(dMemory)
    Else
        GetProcessMemory = "0 Bytes"
    End If
End Function

Private Function ResizeKb(ByVal b As Double) As String
    Dim bSize(8) As String, i As Integer
    bSize(0) = "Bytes"
    bSize(1) = "KB" 'Kilobytes
    bSize(2) = "MB" 'Megabytes
    bSize(3) = "GB" 'Gigabytes
    bSize(4) = "TB" 'Terabytes
    bSize(5) = "PB" 'Petabytes
    bSize(6) = "EB" 'Exabytes
    bSize(7) = "ZB" 'Zettabytes
    bSize(8) = "YB" 'Yottabytes
    For i = UBound(bSize) To 0 Step -1
        If b >= (1024 ^ i) Then
            ResizeKb = ThreeNonZeroDigits(b / (1024 ^ _
                i)) & " " & bSize(i)
            Exit For
        End If
    Next
End Function

Private Function ThreeNonZeroDigits(ByVal value As Double) As Double
    If value >= 100 Then
        ThreeNonZeroDigits = FormatNumber(value)
    ElseIf value >= 10 Then
        ThreeNonZeroDigits = FormatNumber(value, 1)
    Else
        ThreeNonZeroDigits = FormatNumber(value, 2)
    End If
End Function

快照