vba - For Each 循环 : Some items get skipped when looping through Outlook mailbox to delete items

Question

我想开发这样的 VBA 代码:

遍历邮箱中的所有电子邮件项目

如果有任何类型的其他项目，请说“日历邀请”跳过该项目。

找出带附件的电子邮件

如果附件有“.xml”扩展名和特定标题，则将其保存到目录中，否则继续搜索

执行第 4 步后，将所有包含 .xml 附件的电子邮件放入“已删除邮件”文件夹，并通过循环删除该文件夹中的所有电子邮件。

代码完美运行，除了；
例如

您的邮箱中收到了 8 封附有“.xml”文件的电子邮件。

运行代码

您将看到 8 个项目中只有 4 个成功处理，其他 4 个保留在它们的位置。

如果您再次运行代码，现在将成功处理 2 个项目，另外 2 个保留在您的邮箱中。

问题:运行代码后，它应该处理所有文件并在每次运行中将它们全部删除而不是其中的一半。我希望它在一次运行中处理所有项目。

顺便说一句，每次打开 Outlook 时都会运行此代码。

Private Sub Application_Startup()
'Initializing Application_Startup forces the macros to be accessible from other offic apps

'Process XML emails

Dim InboxMsg As Object

Dim DeletedItems As Outlook.Folder
Dim MsgAttachment As Outlook.Attachment
Dim ns As Outlook.NameSpace
Dim Inbox As Outlook.Folder

Dim fPathTemp As String
Dim fPathXML_SEM As String
Dim fPathEmail_SEM As String
Dim i As Long
Dim xmlDoc As New MSXML2.DOMDocument60
Dim xmlTitle As MSXML2.IXMLDOMNode
Dim xmlSupNum As MSXML2.IXMLDOMNode

    'Specify the folder where the attachments will be saved
    fPathTemp = "some directory, doesn't matter"
    fPathXML_SEM = "some directory, doesn't matter"
    fPathEmail_SEM = "some directory, doesn't matter"

    'Setup Outlook
    Set ns = GetNamespace("MAPI")
    Set Inbox = ns.Folders.Item("mailbox-name").Folders("Inbox")
    Set DeletedItems = ns.Folders.Item("mailbox-name").Folders("Deleted Items")


    'Loop through all Items in Inbox, find the xml attachements and process if they are the matching reponses
    'On Error Resume Next
    For Each InboxMsg In Inbox.Items
        If InboxMsg.Class = olMail Then 'if it is a mail item

            'Check for xml attachement
            For Each MsgAttachment In InboxMsg.Attachments

                If Right(MsgAttachment.DisplayName, 3) = "xml" Then

                    'Load XML and test for the title of the file
                    MsgAttachment.SaveAsFile fPathTemp & MsgAttachment.FileName
                    xmlDoc.Load fPathTemp & MsgAttachment.FileName
                    Set xmlTitle = xmlDoc.SelectSingleNode("//title")
                    Select Case xmlTitle.Text
                        Case "specific title"
                            'Get supplier number
                            Set xmlSupNum = xmlDoc.SelectSingleNode("//supplierNum")
                            'Save the XML to the correct folder
                            MsgAttachment.SaveAsFile fPathXML_SEM & xmlSupNum.Text & "_" & Format(Date, "yyyy-mm-dd") & ".xml"
                            'Save the email to the correct folder
                            InboxMsg.SaveAs fPathEmail_SEM & xmlSupNum.Text & "_" & Format(Date, "yyyy-mm-dd") & ".msg"
                            'Delete the message
                            InboxMsg.Move DeletedItems
                        Case Else

                    End Select
                    'Delete the temp file
                    On Error Resume Next
                    Kill fPathTemp & MsgAttachment.FileName
                    On Error GoTo 0
                    'Unload xmldoc
                    Set xmlDoc = Nothing
                    Set xmlTitle = Nothing
                    Set xmlSupNum = Nothing
                End If
            Next
        End If
    Next

    'Loop through deleted items and delete
    For Each InboxMsg In DeletedItems.Items
        InboxMsg.Delete
    Next

    'Clean-up
    Set InboxMsg = Nothing
    Set DeletedItems = Nothing
    Set MsgAttachment = Nothing
    Set ns = Nothing
    Set Inbox = Nothing
    i = 0

End Sub

Answer 1

可能的原因:当您这样做时 InboxMsg.Move ，收件箱中移动的邮件之后的所有邮件都会在列表中上升一个位置。所以你最终会跳过其中的一些。这是 VBA 的一个主要烦恼 For Each构造(它似乎也不一致)。

可能的解决方案:更换

For Each InboxMsg In Inbox.Items

和

For i = Inbox.Items.Count To 1 Step -1 'Iterates from the end backwards
    Set InboxMsg = Inbox.Items(i)

这样你就从列表的末尾向后迭代。当您将消息移至已删除项目时，列表中的以下项目何时增加一个并不重要，因为您已经处理了它们。