通过iPhone发送的邮件中没有附件

我正在尝试使用MFMailComposeViewController将录制的声音文件作为附件发送

声音文件正常

选择器显示正确的文件名，将音频文件图标显示为附件，发送邮件，但结果中没有附件

我在下面附上了发送邮件的来源。有一个文本/普通内容类型部分，而不是内容配置：附件；正如所料

这是我定义路径和附加音频文件的代码。有什么不对劲吗

#define DOCUMENTS_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]
#define FILEPATH [DOCUMENTS_FOLDER stringByAppendingPathComponent:[self dateString]]

以及发送邮件的来源：

Content-type: multipart/mixed; boundary=Apple-Mail-1-614960740
Content-transfer-encoding: 7bit
MIME-version: 1.0 (iPod Mail 7E18)
Subject: Sound message:
Date: Sun, 11 Apr 2010 11:58:56 +0200

X-Mailer: iPod Mail (7E18)

--Apple-Mail-1-614960740

Content-Type: text/plain;
    charset=us-ascii;
    format=flowed
Content-Transfer-Encoding: 7bit

It is a text here

--Apple-Mail-1-614960740
Content-Type: text/plain;
    charset=us-ascii;
    format=flowed
Content-Transfer-Encoding: 7bit

Sent from my iPod
--Apple-Mail-1-614960740--

我发现[url路径]对于dataWithContentsOfFile是不正确的，我使用了[[self.recorder url]路径]来代替它，它工作得很好

MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;
NSURL *url = [NSURL fileURLWithPath: [NSString stringWithFormat:@"%@", [self.recorder url]]];
NSData *audioData = [NSData dataWithContentsOfFile:[url path]];
[picker addAttachmentData:audioData mimeType:@"audio/wav" fileName:[[url path] lastPathComponent]];

Content-type: multipart/mixed; boundary=Apple-Mail-1-614960740
Content-transfer-encoding: 7bit
MIME-version: 1.0 (iPod Mail 7E18)
Subject: Sound message:
Date: Sun, 11 Apr 2010 11:58:56 +0200

X-Mailer: iPod Mail (7E18)

--Apple-Mail-1-614960740

Content-Type: text/plain;
    charset=us-ascii;
    format=flowed
Content-Transfer-Encoding: 7bit

It is a text here

--Apple-Mail-1-614960740
Content-Type: text/plain;
    charset=us-ascii;
    format=flowed
Content-Transfer-Encoding: 7bit

Sent from my iPod
--Apple-Mail-1-614960740--