电子邮件上的垫子文件空白？

Question

我使用以下功能创建带有附件的电子邮件。

def createEmaiLWithAttachments_Filepaths(self,send_to_emails, subject_text , main_message_text , attachment_filepaths, msgID=None, inReplyTo=None, html=False): 
    try: 
        fromEmail = self.from_email_total
        
        if (type(main_message_text) == list) or (type(main_message_text) == tuple): 
            total_text = ""
            for line in main_message_text:
                if type(line) == str: 
                    total_text = total_text + line + "\n"
            main_message_text = total_text

        mimeMessage = MIMEMultipart()
        if type(send_to_emails) == list: 
            mimeMessage['to'] = ", ".join(send_to_emails)
        else: 
            mimeMessage['to'] = send_to_emails
        
        mimeMessage['from'] = fromEmail
        mimeMessage['subject'] = subject_text
        if inReplyTo != None: 
            mimeMessage["In-Reply-To"] = inReplyTo
            mimeMessage["References"] = inReplyTo
        if msgID != None: 
            mimeMessage['Message-ID'] = msgID
        if html: 
            msg= MIMEText(main_message_text, 'html')
        else: 
            msg= MIMEText(main_message_text, "plain")
        mimeMessage.attach(msg)
        
        attachments = list()
        for attachment_filepath in attachment_filepaths:
            attachment_filepath = fr"{attachment_filepath}"
            with open(attachment_filepath, 'rb') as FID:
                file_instance_bytes = FID.read()
                
            file_name = Path(attachment_filepath).name
            to_attach = (file_name,file_instance_bytes)
            attachments.append(to_attach)
                

        totalSizeOf = 0
        MAX_BYTES = 50000000
        for attachment in attachments: 
            attachment_name = attachment[0]
            attachment_instance = attachment[1]
            attachmentSizeBytes = sys.getsizeof(attachment_instance)
            if totalSizeOf + attachmentSizeBytes > MAX_BYTES:
                self.HifiGmailAPILogger.error(f"The attachment ({attachment_name}) not attached due to the attachment causing the email to exceed maximum limit ({MAX_BYTES}) bytes")
                continue
            else:
                totalSizeOf = totalSizeOf + attachmentSizeBytes
            content_type, encoding = mimetypes.guess_type(attachment_name)
            if content_type is None or encoding is not None:
                content_type = 'application/octet-stream'
            main_type, sub_type = content_type.split('/', 1)    
            if main_type == 'text': 
                try: 
                    msg = MIMEText(attachment_instance, _subtype=sub_type)
                except: 
                    attachment_instance = attachment_instance.decode("utf-8")
                    msg = MIMEText(attachment_instance, _subtype=sub_type)
            elif main_type == 'image':
                msg = MIMEImage(attachment_instance, _subtype=sub_type)
            elif main_type == 'audio':
                msg = MIMEAudio(attachment_instance, _subtype=sub_type)
            else:
                msg = MIMEBase(main_type, sub_type)
                msg.set_payload(attachment_instance) 
            msg.add_header('Content-Disposition', 'attachment', filename=attachment_name)
            mimeMessage.attach(msg) 

        raw_string = base64.urlsafe_b64encode(mimeMessage.as_string().encode()).decode()
        theMessage = {'raw': raw_string}
        return theMessage
    except: 
        self.GmailAPILogger.error("An error occurred in createEmaiLWithAttachments")
        tb = traceback.format_exc()
        self.GmailAPILogger.exception(tb)
        return False  

它通常有效。但是，我遇到的问题是附加.mat文件。为了澄清，我可以使用此功能将.mat文件附加。但是，.mat文件无效。有时，由于标题中的错误，无法读取文件。其他时候，我可以加载文件，但不会将任何变量加载到工作区中。相反，即使我可以看到.mat文件就像217kb，但工作空间仍然空。

我还试图补充：

if '.mat' in file_name:
    file_instance_bytes = scipy.io.loadmat(attachment_filepath)
else:
    with open(attachment_filepath, 'rb') as FID:
        file_instance_bytes = FID.read()

但是，这会导致几个错误：

raw_string = base64.urlsafe_b64encode(mimeMessage.as_string().encode()).decode()

我该怎么办？

CRC SHA256在原始文件和下载文件之间有所不同。

Answer 1

我必须添加以下内容

from email import encoders


encoders.encode_base64(msg)

，其中msg是附件。我在每个附件上运行该功能。

def createEmaiLWithAttachments_Filepaths(self,send_to_emails, subject_text , main_message_text , attachment_filepaths, msgID=None, inReplyTo=None, html=False): 
    try: 
        fromEmail = self.from_email_total
        
        if (type(main_message_text) == list) or (type(main_message_text) == tuple): 
            total_text = ""
            for line in main_message_text:
                if type(line) == str: 
                    total_text = total_text + line + "\n"
            main_message_text = total_text

        mimeMessage = MIMEMultipart()
        if type(send_to_emails) == list: 
            mimeMessage['to'] = ", ".join(send_to_emails)
        else: 
            mimeMessage['to'] = send_to_emails
        
        mimeMessage['from'] = fromEmail
        mimeMessage['subject'] = subject_text
        if inReplyTo != None: 
            mimeMessage["In-Reply-To"] = inReplyTo
            mimeMessage["References"] = inReplyTo
        if msgID != None: 
            mimeMessage['Message-ID'] = msgID
        if html: 
            msg= MIMEText(main_message_text, 'html')
        else: 
            msg= MIMEText(main_message_text, "plain")
        mimeMessage.attach(msg)
        
        attachments = list()
        for attachment_filepath in attachment_filepaths:
            attachment_filepath = fr"{attachment_filepath}"
            with open(attachment_filepath, 'rb') as FID:
                file_instance_bytes = FID.read()
                
            file_name = Path(attachment_filepath).name
            to_attach = (file_name,file_instance_bytes)
            attachments.append(to_attach)
                

        totalSizeOf = 0
        MAX_BYTES = 50000000
        for attachment in attachments: 
            attachment_name = attachment[0]
            attachment_instance = attachment[1]
            attachmentSizeBytes = sys.getsizeof(attachment_instance)
            if totalSizeOf + attachmentSizeBytes > MAX_BYTES:
                self.HifiGmailAPILogger.error(f"The attachment ({attachment_name}) not attached due to the attachment causing the email to exceed maximum limit ({MAX_BYTES}) bytes")
                continue
            else:
                totalSizeOf = totalSizeOf + attachmentSizeBytes
            content_type, encoding = mimetypes.guess_type(attachment_name)
            if content_type is None or encoding is not None:
                content_type = 'application/octet-stream'
            main_type, sub_type = content_type.split('/', 1)    
            if main_type == 'text': 
                try: 
                    msg = MIMEText(attachment_instance, _subtype=sub_type)
                except: 
                    attachment_instance = attachment_instance.decode("utf-8")
                    msg = MIMEText(attachment_instance, _subtype=sub_type)
            elif main_type == 'image':
                msg = MIMEImage(attachment_instance, _subtype=sub_type)
            elif main_type == 'audio':
                msg = MIMEAudio(attachment_instance, _subtype=sub_type)
            else:
                msg = MIMEBase(main_type, sub_type)
                msg.set_payload(attachment_instance) 
                encoders.encode_base64(msg)
            msg.add_header('Content-Disposition', 'attachment', filename=attachment_name)
            mimeMessage.attach(msg) 

        raw_string = base64.urlsafe_b64encode(mimeMessage.as_string().encode()).decode()
        theMessage = {'raw': raw_string}
        return theMessage
    except: 
        self.GmailAPILogger.error("An error occurred in createEmaiLWithAttachments")
        tb = traceback.format_exc()
        self.GmailAPILogger.exception(tb)
        return False 

现在发送所有附件，包括.mat文件。