对于大量项目，宏失败

Question

我有一个运行宏，在大量项目上运行时看似随机点失败。宏通过接收错误日志的收件箱文件夹，用来循环，保存错误日志的文本文件，复制从附件文本的指定行（错误操作名称和等），将这些字符串中的Excel文件来跟踪它们，然后将电子邮件项目移动到另一个收件箱文件夹中。当它通过少于100封电子邮件时，它的效果很好，但最重要的是它很奇怪。在第122次迭代测试失败时，648,350等。总体结构如下。

Sub ErrorLogAuto() 

Dim FileName As String 
Dim Path As String 
Dim TimeInfo As String 
Dim SubjectInfo As String 
Dim IdNumber As String 
Dim Dataline As String 

Dim oItem As Object 
Dim Item As Outlook.Items 
Dim myAttachment(1000) As Outlook.Attachments 
Dim myInspector As Outlook.Inspector 

Dim appExcel As Object 

Dim FileNum As Integer 
Dim found As Integer 
Dim found1 As Integer 
Dim found2 As Integer 
Dim i As Integer 
Dim j As Integer 
Dim op As Integer 
Dim us As Integer 
Dim cdata As Integer 

i = 0 
k = 1 

'Returns proper SOURCE folder 
Set myNameSpace = Application.GetNamespace("MAPI") 
Set myFolder = myNameSpace.GetDefaultFolder(olFolderInbox) 
Set myNewFolder = myFolder.Folders("Test") '--> text between "" is the folder name, only change it here 

'set path for attachments to be saved in 
Path = "C:\test\" 

'Set item = to all emails in test folder 
Set Item = myNewFolder.Items 

'If no emails... 
If Item.Count = 0 Then 
    MsgBox "There are no error messages to sift through." 
    Exit Sub 
End If 

'Open an instance of excel to certain workbook 
Set appExcel = CreateObject("Excel.Application") 
appExcel.Visible = True 
'appExcel.Workbooks.Open (Path & "test.xlsx") 
appExcel.Workbooks.Open (Path & "SAMPLE FILE NAME.xlsx") 

'Find first empty cell to write to --> based off of column D 
While appExcel.Range("D" & k) <> "" 
    k = k + 1 
Wend 

'For every email in folder...here starts the big loop 
For Each oItem In Item 

    'Save attachment and set filename 
    Set myAttachment(i) = oItem.Attachments 
     myAttachment(i).Item(1).SaveAsFile Path & myAttachment(i).Item(1).DisplayName & ".txt" 
     FileName = Path & myAttachment(i).Item(1).DisplayName & ".txt" 

    'Subject and time info 
    SubjectInfo = oItem.Subject 
    TimeInfo = oItem.ReceivedTime 

    'Returns ID number from subject string after '@' 
    j = InStr(SubjectInfo, "@") 
    IdNumber = Mid(SubjectInfo, j + 1) 

    'Write IdNumber to cell and timestamp 
    appExcel.Range("A" & k) = TimeInfo 
    appExcel.Range("D" & k) = IdNumber 


    'Open the notepad file, read line by line until EOF, take user message, and take operation name 
    FileNum = FreeFile() 
    Open FileName For Input As #FileNum 

    While Not EOF(FileNum) 

     Line Input #FileNum, Dataline 

     'If string found these will <> 0 
     found = InStr(Dataline, "<OperationName>") 
     found1 = InStr(Dataline, "<UserMessage>") 
     found2 = InStr(Dataline, "<UserMessage><![CDATA[") 

     'Returns position right after where string is found 
     op = InStr(Dataline, "<OperationName>") + 15 
     us = InStr(Dataline, "<UserMessage>") + 13 
     cdata = InStr(Dataline, "<UserMessage><![CDATA[") + 22 

     'Found operation name line 
     If found <> 0 Then 
      'appExcel.Range("B1") = Dataline --> whole line 
      'appExcel.Range("C" & k) = Mid(Mid(Dataline, 20), 1, Len(Mid(Dataline, 20)) - 16) --> doesnt account for whitespace 
      appExcel.Range("N" & k) = Mid(Mid(Dataline, op), 1, Len(Mid(Dataline, op)) - 16) '--> accounts for whitespace and cuts out <OperationName> and <\OperationName> 
     'Found user message line and it includes cdata stuff 
     ElseIf found1 <> 0 And found2 <> 0 Then 
      'appExcel.Range("C1") = Dataline --> whole line 
      'appExcel.Range("D" & k) = Mid(Mid(Dataline, 20), 1, Len(Mid(Dataline, 20)) - 14) --> doesnt account for whitespace 
      'appExcel.Range("O" & k) = Mid(Mid(Dataline, us), 1, Len(Mid(Dataline, us)) - 14) --> accounts for whitespace and cuts out <UserMessage> and <\UserMessage> 
      appExcel.Range("O" & k) = Mid(Mid(Dataline, cdata), 1, Len(Mid(Dataline, cdata)) - 17) '--> accounts for whitespace and cuts out <UserMessage><![CDATA[ and ]]><\UserMessage> 
     'Found user message line WITHOUT cdata stuff 
     ElseIf found1 <> 0 Then 
      appExcel.Range("O" & k) = Mid(Mid(Dataline, us), 1, Len(Mid(Dataline, us)) - 14) '--> accounts for whitespace and cuts out <UserMessage> and <\UserMessage> 
     End If 

    Wend 

    Close #FileNum 

    i = i + 1 
    k = k + 1 

Next 

Call FolderMove 


End Sub 

Private Sub FolderMove() 

    Dim a As MailItem 
    Dim m As Integer 
    Dim Source As MAPIFolder 
    Dim Destination As MAPIFolder 

    Set Source = Application.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox) 
    Set Source = Source.Folders("Test") '--> text between "" is the folder name, only change it here 

    Set Destination = Application.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox) 
    Set Destination = Destination.Folders("Testing Done") '--> text between "" is the folder name, only change it here 

    For m = Source.Items.Count To 1 Step -1 
     Set a = Source.Items(m) 
     a.move Destination 
    Next 

End Sub 

代码在非EOF循环中读取文件时发生故障。这些错误是由糟糕的编程习惯造成的吗？我从来没有使用过大套，并且是VBA的新手，所以任何帮助将不胜感激。

错误信息：运行时错误'50290'：应用程序定义的或对象定义的错误。 - >在第363次迭代时发生

在调试时重新启动并在达到540之前以相同的方式失败。

然后我重新启动，它完成了。

所以现在我的问题是为什么会发生这种情况？

Answer 1

在联机配置文件中（与缓存相反），Exchange将限制您可以打开的项目的数量（默认为250）。您需要确保通过将对象设置为Northing（VBA）或调用来显式释放对象Marshal.ReleaseComObject的在.NET。你也应该确保你不使用多点符号，以避免你不能明确地释放隐含变量。

for i = 1 to Item.Count 
    set oItem = Item.Items(i) 
    set oAttachments = oItem.Attachments 
    if oAttachments.Count > 0 Then 
    set oAttachment = oAttachments.Item(1) ' do you really want a loop through all attachments? 
    FileName = Path & oAttachment.FileName 
    oAttachment.SaveAsFile FileName 
    set oAttachment = Nothing 
    End If 
    ... 
    set oAttachments = Nothing 
    set oItem = Nothing 
Next i