PythonのOutlook添付ファイルをメモリ内でごにょごにょするために調査した結果

AttachmentProcessInMemory.py

# coding: utf-8
"""
Anaconda環境を想定
参考URL:
    https://docs.microsoft.com/en-us/office/vba/api/outlook.olattachmenttype
    https://docs.microsoft.com/en-us/office/vba/outlook/concepts/attachments/modify-an-attachment-of-an-outlook-email-message
    https://qiita.com/pashango2/items/5075cb2d9248c7d3b5d4#memoryview%E3%81%A7bytes%E3%81%AB%E5%A4%89%E6%8F%9B
"""
import win32com.client
import os.path
import pythoncom
import hashlib


PR_ATTACH_DATA_BIN = "http://schemas.microsoft.com/mapi/proptag/0x37010102"

pythoncom.CoInitialize()  # 不要な環境もある
outlook = win32com.client.Dispatch("Outlook.Application").GetNamespace("MAPI")
inbox = outlook.GetDefaultFolder(6)
folders = inbox.Folders
dev_folder = folders("TEST_FOLDER")
save_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "output")

for mailObj in dev_folder.Items:
    for attachment in mailObj.attachments:
        name = attachment.FileName
        """
        Name 	Value 	Description
        olByReference       	4 	This value is no longer supported since Microsoft Outlook 2007. Use olByValue to attach a copy of a file in the file system.
        olByValue 	            1 	The attachment is a copy of the original file and can be accessed even if the original file is removed.
        olEmbeddeditem 	5 	The attachment is an Outlook message format file (.msg) and is a copy of the original message.
        olOLE 	                6 	The attachment is an OLE document.
        """
        if attachment.Type == 1:
            bin_data = attachment.PropertyAccessor.GetProperty(PR_ATTACH_DATA_BIN)
            b = bin_data.tobytes()
            print(hashlib.md5(b).hexdigest())