Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));    if (!mailClass) {        UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"发送邮件"                                                         message:@"当前系统版本不支持应用内发送邮件功能，您可以使用mailto方法代替"                                                        delegate:self                                               cancelButtonTitle:@"我知道啦"                                               otherButtonTitles: nil] autorelease];        [alert show];                return;    }    if (![mailClass canSendMail]) {        UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"发送邮件"                                                         message:@"用户没有设置邮件账户"                                                        delegate:self                                               cancelButtonTitle:@"我知道啦"                                               otherButtonTitles: nil] autorelease];        [alert show];        return;    }        MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];    mc.mailComposeDelegate = self;    [mc setSubject:@"Hello, World!"];    [mc setToRecipients:[NSArray arrayWithObject:@"xxxxx@163.com"]];//    [mc setCcRecipients:[NSArray arrayWithObject:@"xxxxx@163.com"]];//    [mc setBccRecipients:[NSArray arrayWithObject:@"secret@gmail.com"]];    [mc setMessageBody:@"Hello,slick!!!\n\nCome here, I need you!" isHTML:NO];        // 添加一张图片    UIImage *addPic = [UIImage imageNamed: @"Icon@2x.png"];    NSData *imageData = UIImagePNGRepresentation(addPic);            // png    [mc addAttachmentData: imageData mimeType: @"" fileName: @"Icon.png"];        //添加一个pdf附件    NSString *file = [self fullBundlePathFromRelativePath:@"高质量C++编程指南.pdf"];    NSData *pdf = [NSData dataWithContentsOfFile:file];    [mc addAttachmentData: pdf mimeType: @"" fileName: @"高质量C++编程指南.pdf"];        [self presentViewController:mc animated:YES completion:nil];    [mc release];

- (void)mailComposeController:(MFMailComposeViewController*)controller          didFinishWithResult:(MFMailComposeResult)result                        error:(NSError*)error {    switch (result)    {        case MFMailComposeResultCancelled:            NSLog(@"Mail send canceled...");            break;        case MFMailComposeResultSaved:            NSLog(@"Mail saved...");            break;        case MFMailComposeResultSent:            NSLog(@"Mail sent...");            break;        case MFMailComposeResultFailed:            NSLog(@"Mail send errored: %@...", [error localizedDescription]);            break;        default:            break;    }    [self dismissViewControllerAnimated:YES completion:nil];}

#pragma mark - 使用系统邮件客户端发送邮件   -(void)launchMailApp   {         NSMutableString *mailUrl = [[[NSMutableString alloc]init]autorelease];       //添加收件人       NSArray *toRecipients = [NSArray arrayWithObject: @"first@example.com"];       [mailUrl appendFormat:@"mailto:%@", [toRecipients componentsJoinedByString:@","]];       //添加抄送       NSArray *ccRecipients = [NSArray arrayWithObjects:@"second@example.com", @"third@example.com", nil];         [mailUrl appendFormat:@"?cc=%@", [ccRecipients componentsJoinedByString:@","]];       //添加密送       NSArray *bccRecipients = [NSArray arrayWithObjects:@"fourth@example.com", nil];         [mailUrl appendFormat:@"&bcc=%@", [bccRecipients componentsJoinedByString:@","]];       //添加主题       [mailUrl appendString:@"&subject=my email"];       //添加邮件内容       [mailUrl appendString:@"&body=<b>email</b> body!"];       NSString* email = [mailUrl stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];         [[UIApplication sharedApplication] openURL: [NSURL URLWithString:email]];     }