在这里，我们将给大家分享关于在Unicode文本文件上接收AppEnginePython中的电子邮件附件错误的知识，同时也会涉及到如何更有效地android-通过电子邮件发送文本文件附件、c#–.NE

在这里，我们将给大家分享关于在Unicode文本文件上接收App Engine Python中的电子邮件附件错误的知识，同时也会涉及到如何更有效地android-通过电子邮件发送文本文件附件、c# – .NET中的电子邮件附件损坏、Django Python中带有附件的电子邮件、Google App Engine（Python）中的电子商务产品类别的内容。

• 在Unicode文本文件上接收App Engine Python中的电子邮件附件错误
• android-通过电子邮件发送文本文件附件
• c# – .NET中的电子邮件附件损坏
• Django Python中带有附件的电子邮件
• Google App Engine（Python）中的电子商务产品类别

在Unicode文本文件上接收App Engine Python中的电子邮件附件错误

我有一些代码可以解析电子邮件并找到附件，然后将其作为db.BlobProperties存储到数据存储中（以后可以将其更改为Blobstore）。问题是，当我发送UTF8编码的文本文件时，它将生成错误。

该代码基本上保存了文件并返回一个键，该键被转换为字符串，然后存储在父电子邮件实体中。如您所见，我先解码文件，然后将其存储为Blob。我已经发送了许多附件，并且此代码适用于除使用Unicode编码的文本以外的所有内容。有一个更好的方法吗？如何处理Unicode文本附件？

代码嗅探

    my_file = []    my_list = []    if hasattr(mail_message, ''attachments''):        file_name = ""        file_blob = ""        for filename, filecontents in mail_message.attachments:            file_name = filename            file_blob = filecontents.decode()            my_file.append(file_name)            my_list.append(str(store_file(self, file_name, file_blob)))

store_file

def store_file(self, file_name, file_blob):    new_file = myblob(file_name = file_name,                       file_blob = file_blob)    return new_file.put()

我尝试file_blob = str(file_blob)在上面使用无济于事。这只会破坏代码，文件永远不会被存储。

Unicode文本文件的日志1

Property file_blob must be convertible to a Blob instance (Blob() argument should be str instance, not unicode)Traceback (most recent call last):  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1530, in __call__    rv = self.router.dispatch(request, response)  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1278, in default_dispatcher    return route.handler_adapter(request, response)  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1102, in __call__    return handler.dispatch()  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 572, in dispatch    return self.handle_exception(e, self.app.debug)  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 570, in dispatch    return method(*args, **kwargs)  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/webapp/mail_handlers.py", line 65, in post    self.receive(mail.InboundEmailMessage(self.request.body))  File "/base/data/home/apps/s~ae-baseapp/1.359073377819595139/controllers/InboundHandler.py", line 51, in receive    file_list.append(str(store_file(self, file_name, file_blob)))  File "/base/data/home/apps/s~ae-baseapp/1.359073377819595139/models/MyModel.py", line 63, in store_file    file_blob = file_blob)  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 974, in __init__    prop.__set__(self, value)  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 614, in __set__    value = self.validate(value)  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2780, in validate    (self.name, self.data_type.__name__, err))BadValueError: Property file_blob must be convertible to a Blob instance (Blob() argument should be str instance, not unicode)

记录2，删除filecontents.decode（）并将其替换为filecontents。

Property file_blob must be convertible to a Blob instance (Blob() argument should be str instance, not EncodedPayload)Traceback (most recent call last):  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1530, in __call__    rv = self.router.dispatch(request, response)  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1278, in default_dispatcher    return route.handler_adapter(request, response)  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1102, in __call__    return handler.dispatch()  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 572, in dispatch    return self.handle_exception(e, self.app.debug)  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 570, in dispatch    return method(*args, **kwargs)  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/webapp/mail_handlers.py", line 65, in post    self.receive(mail.InboundEmailMessage(self.request.body))  File "/base/data/home/apps/s~ae-baseapp/1.359097282640216691/controllers/InboundHandler.py", line 57, in receive    file_list.append(str(store_file(self, file_name, file_blob)))  File "/base/data/home/apps/s~ae-baseapp/1.359097282640216691/models/MyModel.py", line 64, in store_file    file_blob = file_blob)  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 974, in __init__    prop.__set__(self, value)  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 614, in __set__    value = self.validate(value)  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2780, in validate    (self.name, self.data_type.__name__, err))BadValueError: Property file_blob must be convertible to a Blob instance (Blob() argument should be str instance, not EncodedPayload)

答案1

附件有效负载是EncodedPayload类的实例。附件具有编码和可选字符集。前者是指传输编码，例如base64；后者用于字符编码，例如UTF-8（此处的字符集有点过时和误导性的术语）。该EncodedPayload.decode()方法对传输编码和文本编码都进行解码，正如您所注意到的，如果您只想获取用户附加到其邮件中的原始字节，则该方法不是很有用。

您可以在此处采用多种方法，但是我建议您复制EncodedPayload的逻辑来解码传输编码，如下所示：

if filecontents.encoding and filecontents.encoding.lower() != ''7bit'':  try:    payload = filecontents.payload.decode(filecontents.encoding)  except LookupError:    raise UnknownEncodingError(''Unknown decoding %s.'' % filecontents.encoding)  except (Exception, Error), e:    raise PayloadEncodingError(''Could not decode payload: %s'' % e)else:  payload = filecontents.payload

请注意，如果附件 是 文本，则在存储附件 时 需要包括字符编码，否则当您将附件发送回用户时将无法解释它-原始文本可能已使用任何字符编码进行了编码。

同样，如果可以的话，您还应该保存附件的模仿类型，但这在API中的任何地方都没有公开。您可能要考虑完全避免使用IncomingMessage类，而是使用Python的mime消息模块对POST请求的主体进行解码。

android-通过电子邮件发送文本文件附件

我正在尝试附加文本文件以便通过电子邮件发送
但是每当我打开“电子邮件”应用程序时,都会说该文件不存在.

Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_EMAIL  , new String[]{"musabyahya1005@gmail.com"});
i.putExtra(Intent.EXTRA_SUBJECT, "subject of email");
i.putExtra(Intent.EXTRA_TEXT   , "body of email");
i.putExtra(Intent.EXTRA_STREAM, Uri.parse(directory+"/data.txt"));

try {
     startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
     Toast.makeText(getBaseContext(), "An Error Happened ", Toast.LENGTH_SHORT).show();
}

解决方法:

如果您尝试通过电子邮件发送文件,请确保它们位于公共可访问位置,并告诉您它是您要发送的文件.使用此代码作为示例.

Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.setType("message/rfc822").putExtra(Intent.EXTRA_EMAIL, new String[]{"fake@example.com"}).putExtra(android.content.Intent.EXTRA_SUBJECT, "Mail subject").putExtra(android.content.Intent.EXTRA_TEXT, "lalalala");
String targetFilePath = Environment.getExternalStorageDirectory().getPath() + File.separator + "tmp" + File.separator + "test.txt";
Uri attachmentUri = Uri.parse(targetFilePath);
emailIntent.putExtra(android.content.Intent.EXTRA_STREAM, Uri.parse("file://" + attachmentUri)); 

c# – .NET中的电子邮件附件损坏

using (MemoryStream pdfStream = new MemoryStream())
{
    pdfStream.Write(pdfData,pdfData.Length);

    Attachment a = new Attachment(pdfStream,string.Format("Receipt_{0}_{1}.pdf",jobId,DateTime.UtcNow.ToString("yyyyMMddHHmm")));

    msg.Attachments.Add(a);

    SmtpClient smtp = new SmtpClient(serverName,port);
    smtp.Credentials = new NetworkCredential(fromEmailName,fromEmailPassword);
    smtp.Send(msg);
}

Django Python中带有附件的电子邮件

def publicationmemoria(request):
    if request.method == "POST":
        inputEmail = request.POST[''inputEmail'']
        inputNome = request.POST[''inputNome'']
        inputCognome = request.POST[''inputCognome'']
        inputImmagine1 = request.POST[''inputImmagine1'']

        send_mail(
            ''Richiesta di pubblicazione - Memoria'',#subject
            ''Dati persona di contatto:'' + ''\n'' +
            ''Email:'' + '' '' + inputEmail + ''\n'' +
            ''Nome:'' + '' '' + inputNome + ''\n''
            ''Cognome:'' + '' '' + inputCognome + ''\n''
            + inputImmagine1,# message
            inputEmail,# from email
            [''myemail.com''],# to email
        )

        return render(request,''publication-memoria.html'',{''inputEmail'': inputEmail,''inputNome'': inputNome,''inputCognome'': inputCognome,''inputImmagine1'': inputImmagine1,})

    else:
        return render(request,{})

class Product(ndb.Model):     name = ndb.StringProperty()    category = ndb.KeyProperty(kind=''Category'', repeated=True)category = ndb.Key("Category", "Books")new_product = Product(title="Coding Horrors Book",                      category=[category]).put()

class ProductCategory(ndb.Model):     product = ndb.KeyProperty(kind=''Product'')    category = ndb.KeyProperty(kind=''Category'')

category_keys = ProductCategory.query(ProductCategory.product == product_key) \                               .fetch(keys_only=True, limit=500)if category_keys:    categories = ndb.get_multi(category_keys)    logging.info(''product %s categories: %s'' \                 % (product.title, '',''.join([c.name for c in categories])))