excel - 如何修复编译错误: User-defined type not defined when using Excel VBA from Outlook?

Question

我正在设置一个自动解决方案，将传入的邮件从 Outlook 导出到 Excel 文件中。
我在网上找到了几种解决方案，但出现编译错误。

我使用的是 Outlook 2016 和 Windows 8.1。

我以为是引用问题，但是我找到了FM20.DLL，还是不行。

我得到的错误:

Compile error: User-defined type not defined

在行 Dim objExcelApp As Excel.Application

Public WithEvents objMails As Outlook.Items

Private Sub Application_Startup()
    Set objMails = 
Outlook.Application.Session.GetDefaultFolder(olFolderInbox).Items
End Sub

Private Sub objMails_ItemAdd(ByVal Item As Object)
    Dim objMail As Outlook.MailItem
    Dim strExcelFile As String
    Dim objExcelApp As Excel.Application
    Dim objExcelWorkBook As Excel.Workbook
    Dim objExcelWorkSheet As Excel.Worksheet
    Dim nNextEmptyRow As Integer
    Dim strColumnB As String
    Dim strColumnC As String
    Dim strColumnD As String
    Dim strColumnE As String

    If Item.Class = olMail Then
       Set objMail = Item
    End If

    'Specify the Excel file which you want to auto export the email list
    'You can change it as per your case
    strExcelFile = "H:\SF_Mail\Emails.xlsx"

    'Get Access to the Excel file
    On Error Resume Next
    Set objExcelApp = GetObject(, "Excel.Application")
    If Error <> 0 Then
       Set objExcelApp = CreateObject("Excel.Application")
    End If
    Set objExcelWorkBook = objExcelApp.Workbooks.Open(strExcelFile)
    Set objExcelWorkSheet = objExcelWorkBook.Sheets("Sheet1")

    'Get the next empty row in the Excel worksheet
    nNextEmptyRow = objExcelWorkSheet.Range("B" & objExcelWorkSheet.Rows.Count).End(xlUp).Row + 1

    'Specify the corresponding values in the different columns
    strColumnB = objMail.SenderName
    strColumnC = objMail.SenderEmailAddress
    strColumnD = objMail.Subject
    strColumnE = objMail.ReceivedTime

    'Add the vaules into the columns
    objExcelWorkSheet.Range("A" & nNextEmptyRow) = nNextEmptyRow - 1
    objExcelWorkSheet.Range("B" & nNextEmptyRow) = strColumnB
    objExcelWorkSheet.Range("C" & nNextEmptyRow) = strColumnC
    objExcelWorkSheet.Range("D" & nNextEmptyRow) = strColumnD
    objExcelWorkSheet.Range("E" & nNextEmptyRow) = strColumnE

    'Fit the columns from A to E
    objExcelWorkSheet.Columns("A:E").AutoFit

    'Save the changes and close the Excel file
    objExcelWorkBook.Close SaveChanges:=True
End Sub

Answer 1

引用文献

这是缺少引用时出现的错误。
尝试在工具->引用中添加:

• Microsoft Excel [您的版本]对象库
• Microsoft Outlook [您的版本]对象库

代码

尝试使用以下方法更改 Excel 应用 的初始化方式:

Dim objExcelApp As New Excel.Application

而不是:

Dim objExcelApp As Excel.Application

所以你的代码将如下所示:

Private Sub objMails_ItemAdd(ByVal Item As Object)
    Dim objMail As Outlook.MailItem
    Dim strExcelFile As String
    Dim objExcelApp As New Excel.Application
    Dim objExcelWorkBook As Excel.Workbook
    Dim objExcelWorkSheet As Excel.Worksheet
    Dim nNextEmptyRow As Integer
    Dim strColumnB As String
    Dim strColumnC As String
    Dim strColumnD As String
    Dim strColumnE As String

    If Item.Class = olMail Then
       Set objMail = Item
    End If

    'Specify the Excel file which you want to auto export the email list
    'You can change it as per your case
    strExcelFile = "H:\SF_Mail\Emails.xlsx"

    'Get Access to the Excel file
    Set objExcelWorkBook = objExcelApp.Workbooks.Open(strExcelFile)
    Set objExcelWorkSheet = objExcelWorkBook.Sheets("Sheet1")

    'Get the next empty row in the Excel worksheet
    nNextEmptyRow = objExcelWorkSheet.Range("B" & objExcelWorkSheet.Rows.Count).End(xlUp).Row + 1

    'Specify the corresponding values in the different columns
    strColumnB = objMail.SenderName
    strColumnC = objMail.SenderEmailAddress
    strColumnD = objMail.Subject
    strColumnE = objMail.ReceivedTime

    'Add the vaules into the columns
    objExcelWorkSheet.Range("A" & nNextEmptyRow) = nNextEmptyRow - 1
    objExcelWorkSheet.Range("B" & nNextEmptyRow) = strColumnB
    objExcelWorkSheet.Range("C" & nNextEmptyRow) = strColumnC
    objExcelWorkSheet.Range("D" & nNextEmptyRow) = strColumnD
    objExcelWorkSheet.Range("E" & nNextEmptyRow) = strColumnE

    'Fit the columns from A to E
    objExcelWorkSheet.Columns("A:E").AutoFit

    'Save the changes and close the Excel file
    objExcelWorkBook.Close SaveChanges:=True
    objExcelApp.Quit 'Quit Excel application
End Sub

注释

通常，使用指令On Error Resume Next不是一个好主意，因为它会抑制运行时执行时遇到的每个错误。但是，该规则有一些异常(exception)，您可以查看@FunThomas 答案以获取澄清。