【发布时间】：2021-12-08 01:56:44
【问题描述】：
根据我的阅读，这是不可能的，但我还是在问，因为也许我错过了另一种选择......
VB.Net Windows 窗体应用程序。
此应用程序有时需要发送电子邮件，这些电子邮件是在用户邮件客户端中创建的，然后他们可以对其进行编辑和发送。这不会自动发送；它必须由用户手动发送。
我们决定使用 MAPI，因为这样可以使其与各种电子邮件客户端兼容，而不是强制使用某种形式的 Outlook；不是每个人都是 MS 的粉丝！
此代码运行良好，但问题是我需要在电子邮件中发送一个 URL，该 URL 被分成两行并且不能立即“可点击”。
我希望喜欢能够以 HTML 格式发送它，但 MAPI 似乎不支持它。
我们已经避免使用 SMTP 客户端，因为这是用户需要设置的少一件事；使用 MAPI，它利用了 IT 部门已经建立的现有电子邮件帐户以及他们可能不想向用户透露的详细信息。
那么，有没有一种方法可以创建不使用 SMTP 客户端以 HTML 格式发送电子邮件并且不花费一臂之力（又名 aspose :-)）的电子邮件？
Public Function sendMAPI(emailAddy As String, subj As String, body As String, Optional attachement As String = "") As Boolean
Dim mapi As New SendFileTo.MAPI
'Dim emailAddy As String = getFundingEmail(cmbFundedBy.Text)
mapi.AddRecipientTo(emailAddy)
If attachement = "" Then
Else
mapi.AddAttachment(attachement)
End If
Dim q = mapi.SendMailPopup(subj, body)
If mapi.GetLastError.Contains("OK") Then
If Not UpdateUserLog(Now(), sUsername, "eMail to " + emailAddy + " created in MAPI client") Then
MessageBox.Show("Unable to update user log")
End If
Return True
Else
If Not UpdateUserLog(Now(), sUsername, "eMail to " + emailAddy + " *NOT* created in MAPI client") Then
MessageBox.Show("Unable to update user log")
End If
Return False
End If
End Function
Imports System
Imports System.Runtime.InteropServices
Imports System.IO
Imports System.Collections.Generic
Imports System.Windows.Forms
Namespace SendFileTo
Class MAPI
Public Function AddRecipientTo(ByVal email As String) As Boolean
Return AddRecipient(email, howTo.MAPI_TO)
End Function
Public Function AddRecipientCC(ByVal email As String) As Boolean
Return AddRecipient(email, howTo.MAPI_TO)
End Function
Public Function AddRecipientBCC(ByVal email As String) As Boolean
Return AddRecipient(email, howTo.MAPI_TO)
End Function
Public Sub AddAttachment(ByVal strAttachmentFileName As String)
m_attachments.Add(strAttachmentFileName)
End Sub
Public Function SendMailPopup(ByVal strSubject As String, ByVal strBody As String) As Integer
Return SendMail(strSubject, strBody, MAPI_LOGON_UI Or MAPI_DIALOG)
End Function
Public Function SendMailDirect(ByVal strSubject As String, ByVal strBody As String) As Integer
Return SendMail(strSubject, strBody, MAPI_LOGON_UI)
End Function
<DllImport("MAPI32.DLL")>
Private Shared Function MAPISendMail(ByVal sess As IntPtr, ByVal hwnd As IntPtr, ByVal message As MapiMessage, ByVal flg As Integer, ByVal rsv As Integer) As Integer
End Function
Private Function SendMail(ByVal strSubject As String, ByVal strBody As String, ByVal how As Integer) As Integer
Dim msg As MapiMessage = New MapiMessage()
msg.subject = strSubject
msg.noteText = strBody
msg.recips = GetRecipients(msg.recipCount)
msg.files = GetAttachments(msg.fileCount)
m_lastError = MAPISendMail(New IntPtr(0), New IntPtr(0), msg, how, 0)
If m_lastError > 1 Then
MessageBox.Show("MAPISendMail failed! " + GetLastError(), "MAPISendMail")
End If
Cleanup(msg)
Return m_lastError
End Function
Private Function AddRecipient(ByVal email As String, ByVal howTo As howTo) As Boolean
Dim recipient As MapiRecipDesc = New MapiRecipDesc()
recipient.recipClass = CType(howTo, Integer)
recipient.name = email
m_recipients.Add(recipient)
Return True
End Function
Private Function GetRecipients(ByRef recipCount As Integer) As IntPtr
recipCount = 0
If m_recipients.Count = 0 Then
Return 0
End If
Dim size As Integer = Marshal.SizeOf(GetType(MapiRecipDesc))
Dim intPtr As IntPtr = Marshal.AllocHGlobal(m_recipients.Count * size)
Dim ptr As Integer = CType(intPtr, Integer)
Dim mapiDesc As MapiRecipDesc
For Each mapiDesc In m_recipients
Marshal.StructureToPtr(mapiDesc, CType(ptr, IntPtr), False)
ptr += size
Next
recipCount = m_recipients.Count
Return intPtr
End Function
Private Function GetAttachments(ByRef fileCount As Integer) As IntPtr
fileCount = 0
If m_attachments Is Nothing Then
Return 0
End If
If (m_attachments.Count <= 0) Or (m_attachments.Count > maxAttachments) Then
Return 0
End If
Dim size As Integer = Marshal.SizeOf(GetType(MapiFileDesc))
Dim intPtr As IntPtr = Marshal.AllocHGlobal(m_attachments.Count * size)
Dim mapiFileDesc As MapiFileDesc = New MapiFileDesc()
mapiFileDesc.position = -1
Dim ptr As Integer = CType(intPtr, Integer)
Dim strAttachment As String
For Each strAttachment In m_attachments
mapiFileDesc.name = Path.GetFileName(strAttachment)
mapiFileDesc.path = strAttachment
Marshal.StructureToPtr(mapiFileDesc, CType(ptr, IntPtr), False)
ptr += size
Next
fileCount = m_attachments.Count
Return intPtr
End Function
Private Sub Cleanup(ByRef msg As MapiMessage)
Dim size As Integer = Marshal.SizeOf(GetType(MapiRecipDesc))
Dim ptr As Integer = 0
If msg.recips <> IntPtr.Zero Then
ptr = CType(msg.recips, Integer)
Dim i As Integer
For i = 0 To msg.recipCount - 1 Step i + 1
Marshal.DestroyStructure(CType(ptr, IntPtr), GetType(MapiRecipDesc))
ptr += size
Next
Marshal.FreeHGlobal(msg.recips)
End If
If msg.files <> IntPtr.Zero Then
size = Marshal.SizeOf(GetType(MapiFileDesc))
ptr = CType(msg.files, Integer)
Dim i As Integer
For i = 0 To msg.fileCount - 1 Step i + 1
Marshal.DestroyStructure(CType(ptr, IntPtr), GetType(MapiFileDesc))
ptr += size
Next
Marshal.FreeHGlobal(msg.files)
End If
m_recipients.Clear()
m_attachments.Clear()
m_lastError = 0
End Sub
Public Function GetLastError() As String
If m_lastError <= 26 Then
Return errors(m_lastError)
End If
Return "MAPI error [" + m_lastError.ToString() + "]"
End Function
ReadOnly errors() As String = New String() {"OK [0]", "User abort [1]", "General MAPI failure [2]", "MAPI login failure [3]", "Disk full [4]", "Insufficient memory [5]", "Access denied [6]", "-unknown- [7]", "Too many sessions [8]", "Too many files were specified [9]", "Too many recipients were specified [10]", "A specified attachment was not found [11]", "Attachment open failure [12]", "Attachment write failure [13]", "Unknown recipient [14]", "Bad recipient type [15]", "No messages [16]", "Invalid message [17]", "Text too large [18]", "Invalid session [19]", "Type not supported [20]", "A recipient was specified ambiguously [21]", "Message in use [22]", "Network failure [23]", "Invalid edit fields [24]", "Invalid recipients [25]", "Not supported [26]"}
Dim m_recipients As New List(Of MapiRecipDesc)
Dim m_attachments As New List(Of String)
Dim m_lastError As Integer = 0
Private Const MAPI_LOGON_UI As Integer = &H1
Private Const MAPI_DIALOG As Integer = &H8
Private Const maxAttachments As Integer = 20
Enum howTo
MAPI_ORIG = 0
MAPI_TO
MAPI_CC
MAPI_BCC
End Enum
End Class
<StructLayout(LayoutKind.Sequential)>
Public Class MapiMessage
Public reserved As Integer
Public subject As String
Public noteText As String
Public messageType As String
Public dateReceived As String
Public conversationID As String
Public flags As Integer
Public originator As IntPtr
Public recipCount As Integer
Public recips As IntPtr
Public fileCount As Integer
Public files As IntPtr
End Class
<StructLayout(LayoutKind.Sequential)>
Public Class MapiFileDesc
Public reserved As Integer
Public flags As Integer
Public position As Integer
Public path As String
Public name As String
Public type As IntPtr
End Class
<StructLayout(LayoutKind.Sequential)>
Public Class MapiRecipDesc
Public reserved As Integer
Public recipClass As Integer
Public name As String
Public address As String
Public eIDSize As Integer
Public enTryID As IntPtr
End Class
End Namespace
【问题讨论】：
-
首先，这是Simple MAPI，不支持HTML。
-
谢谢德米特里。我一直在努力寻找其他有效的方法！你有什么别的推荐吗？
-
在 Outlook 版本的 Simple MAPI 中曾经有一个错误，它允许传递 HTML 而不是纯文本，但我认为它不再起作用了。如果安装了 Outlook，OOM 将工作。如果没有，您可以回退到 Simple MAPI。
-
如你所说，我已经在使用简单的 MAPI。我需要发送 HTML 电子邮件
-
可以在调用
MailItem.Send之前使用OOM并设置MailItem.HTMLBody属性。
标签： vb.net email mapi simple-mapi