Convert multiple eml files to single PST in C#
I need to write a single function which will take multiple eml files ( may be from a single filesystem folder ) and convert them to a single PST file.
Is it possible? if yes can someone provide a sample code?
I assume its possible because there are many commercial eml to pst converters out there doing this
Answer
Although Outlook can open EML files, there is no way to do it programatically only with VBA. So I created this VBA macro which loops through some folder and opens each EML file using SHELL EXEC. It may take a few milliseconds until Outlook opens the EML file, so the VBA waits until something is open in ActiveInspector. Finally, this email is copied into some chosen folder, and (in case of success) the original EML file is deleted.
This macro crashes sometimes, but you can restart the macro at any time, and it will restart from where it previously crashed (remember, all successfully imported EML files are deleted). If it keeps crashing after restart, then probably there is a problem with the next EML file which is about to be imported. In this case you can just delete the problematic EML.
PS: Sometimes you can open the EML yourself, without crashing Outlook, but according to my tests, everytime that a EML file was crashing Outlook it was something unimportant, like read receipts.
Here follows my VBA code. If you have any doubts or problems, let me know.
'----------------------------------------------------
' Code by Ricardo Drizin (contact info at http://www.drizin.com.br)
'----------------------------------------------------
Private Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Option Explicit
'---------------------------------------------------------------------
' This method closes ActiveInspectors if any.
' All inporting is based on the assumption that the EML
' is opened by shell and we can refer to it through the ActiveInspector
'---------------------------------------------------------------------
Function CloseOpenInspectors() As Boolean
Dim app As Outlook.Application: Set app = CreateObject("Outlook.Application")
Dim insp As Outlook.Inspector
Dim count As Integer
count = 0
repeat:
count = count + 1
Set insp = app.ActiveInspector
If TypeName(insp) = "Nothing" Then
CloseOpenInspectors = True
Exit Function
End If
If TypeName(insp.CurrentItem) = "Nothing" Then
CloseOpenInspectors = True
Exit Function
End If
If (count > 100) Then
MsgBox "Error. Could not close ActiveInspector. "
CloseOpenInspectors = False
End If
insp.Close (olDiscard)
GoTo repeat
End Function
'---------------------------------------------------------------------
' This method allows user to choose a Root Folder in Outlook
' All EML files will be imported under this folder
'---------------------------------------------------------------------
Function GetRootFolder() As Outlook.folder
Dim app As Outlook.Application: Set app = CreateObject("Outlook.Application")
Dim NS As Outlook.NameSpace: Set NS = app.GetNamespace("MAPI")
Dim fold As Outlook.folder
Set fold = NS.PickFolder
'MsgBox fold.Name
Set GetRootFolder = fold
End Function
'---------------------------------------------------------------------
' Creates a child folder in Outlook, under root folder.
'---------------------------------------------------------------------
Function GetChildFolder(parentFolder As Outlook.folder, name As String)
On Error Resume Next
Dim fold2 As Outlook.folder
Set fold2 = parentFolder.folders.Item(name)
If Err.Number Then
On Error GoTo 0
Set fold2 = parentFolder.folders.Add(name)
End If
On Error GoTo 0
'MsgBox fold2.Name
Set GetChildFolder = fold2
End Function
'---------------------------------------------------------------------
' Imports the EML open in the current ActiveInspector
' into the given folder
'---------------------------------------------------------------------
Sub ImportOpenItem(targetFolder As Outlook.folder)
Dim app As Outlook.Application: Set app = CreateObject("Outlook.Application")
Dim insp As Outlook.Inspector: Set insp = app.ActiveInspector
Dim retries As Integer
retries = 0
While TypeName(insp) = "Nothing" ' READING PANE should be visible, or else it will not work.
'MsgWaitObj (1000)
Sleep (50)
DoEvents
Sleep (50)
Set insp = app.ActiveInspector
retries = retries + 1
'If retries > 100 Then
' Stop
'End If
Wend
If TypeName(insp) = "Nothing" Then
MsgBox "Error! Could not find open inspector for importing email."
Exit Sub
End If
Dim m As MailItem, m2 As MailItem, m3 As MailItem
Set m = insp.CurrentItem
'MsgBox m.Subject
Set m2 = m.Copy
Set m3 = m2.Move(targetFolder)
m3.Save
Set m = Nothing
Set m2 = Nothing
Set m3 = Nothing
insp.Close (olDiscard)
Set insp = Nothing
End Sub
'---------------------------------------------------------------------
' Scans a given folder for *.EML files and import them
' into the given folder.
' Each EML file will be deleted after importing.
'---------------------------------------------------------------------
Sub ImportEMLFromFolder(targetFolder As Outlook.folder, emlFolder As String)
If Right(emlFolder, 1) <> "\" Then emlFolder = emlFolder & "\"
Dim firstImport As Boolean: firstImport = True
Dim file As String
Dim count As Integer: count = 0
'MsgBox fold.Items.count
'Exit Sub
file = Dir(emlFolder & "*.eml")
repeat:
If file = "" Then
'MsgBox "Finished importing EML files. Total = " & count
Debug.Print "Finished importing EML files. Total = " & count
Exit Sub
End If
count = count + 1
Debug.Print "Importing... " & file & " - " & emlFolder
Shell ("explorer """ & emlFolder & file & """")
'If firstImport Then Stop
firstImport = False
Sleep (50)
On Error GoTo nextfile
Call ImportOpenItem(targetFolder)
Call Kill(emlFolder & file)
nextfile:
On Error GoTo 0
Sleep (50)
file = Dir()
GoTo repeat
End Sub
'---------------------------------------------------------------------
' Main method.
' User chooses an Outlook root Folder, and a Windows Explorer root folder.
' All EML files inside this folder and in immediate subfolders will be imported.
'---------------------------------------------------------------------
Sub ImportAllEMLSubfolders()
Call CloseOpenInspectors
MsgBox "Choose a root folder for importing "
Dim rootOutlookFolder As Outlook.folder
Set rootOutlookFolder = GetRootFolder()
If rootOutlookFolder Is Nothing Then Exit Sub
Dim rootWindowsFolder As String
rootWindowsFolder = "D:\Outlook Express EMLs folder"
rootWindowsFolder = InputBox("Choose a windows folder where you have your EML files", , rootWindowsFolder)
If IsNull(rootWindowsFolder) Or IsEmpty(rootWindowsFolder) Or rootWindowsFolder = "" Then Exit Sub
If Right(rootWindowsFolder, 1) <> "\" Then rootWindowsFolder = rootWindowsFolder & "\"
Dim subFolders As New Collection
Dim subFolder As String
subFolder = Dir(rootWindowsFolder, vbDirectory)
repeat:
If subFolder = "." Or subFolder = ".." Then GoTo nextdir
If (GetAttr(rootWindowsFolder & subFolder) And vbDirectory) = 0 Then GoTo nextdir
subFolders.Add (subFolder)
nextdir:
subFolder = Dir()
If subFolder <> "" Then GoTo repeat
Dim outlookFolder As Outlook.folder
' Importing main folder
Call ImportEMLFromFolder(rootOutlookFolder, rootWindowsFolder)
' Importing subfolders
While subFolders.count
subFolder = subFolders.Item(1)
subFolders.Remove (1)
Set outlookFolder = GetChildFolder(rootOutlookFolder, subFolder)
Debug.Print "Importing " & rootWindowsFolder & subFolder & " into Outlook folder " & outlookFolder.name & "..."
Call ImportEMLFromFolder(outlookFolder, rootWindowsFolder & subFolder)
Wend
Debug.Print "Finished"
End Sub