Getting the attachment contents of an rtf mail in vsto c#-CodePudding

we are trying to get the content of the attachment's of the in the rtf mail but I have tried to search using different terms but have not found any reliable solution . can someone please help me to get the source of the attachment's as we get them in the html format.

CodePudding user response：

The Outlook object model doesn't provide any property or method for getting the attachment content. To get the file attached you need to save it to the disk and then read the content from the there.

Also you may consider using a low-level API on which Outlook is based on - Extended MAPI. It allows getting the binary data of the attached file. Try using the Attachment.PropertyAccessor.GetProperty method while passing in the value "http://schemas.microsoft.com/mapi/proptag/0x37010102" (PR_ATTACH_DATA_BIN).

set msg = Application.ActiveExplorer.Selection(1)
set attach = msg.Attachments(1)
set ps = attach.PropertyAccessor
v = ps.GetProperty("http://schemas.microsoft.com/mapi/proptag/0x37010102")
debug.print ps.BinaryToString(v)

CodePudding user response：

On the low level (Extended MAPI in C or Delphi), you need to open the PR_ATTACH_DATA_OBJ property as IStorage and extract the data from there (it depends on the actual type of the attachment). You can see the data in the streams in OutlookSpy (I am its author) - select the message, click IMessage button on the OutlookSpy ribbon, go to the GetAttachmentTable tab, double click on the attachment to open it, select the PR_ATTACH_DATA_OBJ property, right click, select IMAPIProp::OpenProperty, then IStorage. Raw data will be there as well as an image representing the attachment (so that Outlook won't have to start the host app when rendering the message).

If using Redemption is an option (I am also its author, it can be used from any language including C# and VBA), its version of RDOAttachment.SaveAsFile method handles OLE attachments for most popular formats (Word, Excel, bitmap, Power Point, Adobe PDF, etc.) - create an instance of the RDOSession object (using either CrealeOleObject or RedemptionLoader) and use RDOSession.GetRDOObjectFromOutlookObject method (pass either MailItem or Attachment object) to get back RDOMail or RDOAttachment object respectively.