objective-c - 我的错误 MIME : The Code is Obj-C, 但问题不是特定于语言的 - 非常棘手

Question

我正在使用以下字典创建 MIME header ，以发送附有文本文件的电子邮件。它在代码下方生成电子邮件。为什么一切都是乱码？那里有 MIME 专家吗？

此外，答案并不像您对它进行 Base64 编码那么简单。如果我将它从“内联”更改为“附件”，则电子邮件附件在发送到 Web Gmail 时已损坏，但文件正常并且可以通过 GMail 打开，但在 Mac 上由 Mail 打开。此外，如果文本文件非常小，它在 GMail 上也能正常工作。

这是这个未回答问题的先前表述。我在此示例中稍微更改了代码，以避免我认为可能是转移注意力的内容:GMail won't open .txt attachment created by iPhone App, Depending on Size - I think There's a Bug in my MIME

NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:
  @"text/plain", kSKPSMTPPartContentTypeKey,
  @"Hey Kevin,\nHere are some gps readings for you to filter.\nLove,\nTrailBehind", kSKPSMTPPartMessageKey,
  @"8bit", kSKPSMTPPartContentTransferEncodingKey, nil];

NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *gpsFilePath = [[@"/tracks/" stringByAppendingString:[track title]] stringByAppendingString:@"/accelerometerReadings.txt"];
gpsFilePath = [[paths objectAtIndex:0] stringByAppendingString: gpsFilePath];

NSData *fileData = [NSData dataWithContentsOfFile:gpsFilePath];
NSDictionary *attached = [NSDictionary dictionaryWithObjectsAndKeys:
  @"text/plain;", kSKPSMTPPartContentTypeKey,
  @"inline;\r\tfilename=\"accelerometerReadings.txt\"", kSKPSMTPPartContentDispositionKey,
  [fileData encodeBase64ForData], kSKPSMTPPartMessageKey,
  @"base64", kSKPSMTPPartContentTransferEncodingKey, nil];

testMsg.parts = [NSArray arrayWithObjects:plainPart, attached, nil];
[testMsg send];

电子邮件

--SKPSMTPMessage--Separator--Delimiter
Content-Type: text/plain
Content-Transfer-Encoding: 8bit

Hey Kevin,
Here are some gps readings for you to filter.
Love,
TrailBehind
--SKPSMTPMessage--Separator--Delimiter
Content-Disposition: attachment;    filename="track.gpx"
Content-Type: text/plain;
Content-Transfer-Encoding: base64

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!
 jc3ODUiPjwvdHJrcHQ+CgogICAgICA8dHJrcHQgbGF0PSIzOS4zMTYzNjMiIGxvbj0iLTE
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--SKPSMTPMessage--Separator--Delimiter

--SKPSMTPMessage--Separator--Delimiter--

Answer 1

如果那是你的 Base64 输出的样子，那就错了；它应该被包装成 76 个字符的行以用于电子邮件。此外，它看起来像是添加了一些空格(可能是因为它没有被包裹)

此外，您是否正在设置内容传输编码？我看到设置内容类型和内容处置的行，但没有内容传输编码，您将获得默认值(7 位)...这将只显示编码的 MIME。这就是正在发生的事情。

我建议根据 RFC 2045 检查您的原始邮件输出(例如，gmail 中的“显示原始邮件”)特别是 §6 和 §6.8。

如果这不能解决您的问题，请编辑以包含原始消息。