不能发送电子邮件xcode的pdf文件

Question

请帮助我！尽管我在电子邮件中看到图标文件附件，但我可以发送图像，但无法发送PDF文件。 我的代码：

MFMailComposeViewController *sendmailview = [[MFMailComposeViewController alloc] init]; 
    sendmailview.mailComposeDelegate = self; 
// I can send image with: 
// UIImage *roboPic = [UIImage imageNamed:@"Default.png"]; 
// NSData *imageData = UIImageJPEGRepresentation(roboPic, 1); 
// [sendmailview addAttachmentData:imageData mimeType:@"image/png" fileName:@"Default.png"]; 

// But Can't send pdf file 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 

    NSString *documentsDirectory = [paths objectAtIndex:0]; 

     NSString *file = [documentsDirectory stringByAppendingFormat:@"book.pdf"]; 

    NSMutableData *data=[NSMutableData dataWithContentsOfFile:file]; 

    [sendmailview addAttachmentData:data mimeType:@"application/pdf" fileName:@"book.pdf"]; 

// I see icon book.pdf when attach,but when i sent mail,mail receiver not see pdf file... 

     [self presentModalViewController:sendmailview animated:YES]; 

    [sendmailview release]; 

帮我........

谢谢！的

NSString *file = [documentsDirectory stringByAppendingFormat:@"book.pdf"]; 

而且

Answer 1

使用

NSString *file = [documentsDirectory stringByAppendingFileComponent:@"book.pdf"]; 

相反，数据可以NSData而不是NSMutableData。

NSData *data = [NSData dataWithContentsOfFile:file]; 

最后，您是否确保PDF文件存在于您所指的路径中？变量数据是否有效？