Question

我是IOS开发的新手，我在从邮件下载附件时遇到问题。当我尝试使用MailCore2 SDK将图像或PDF附件从我的邮件下载到文档目录时，它正在成功下载。但是我的问题是下载的图像或PDF没有显示任何内容（即）。它给我文件，但文件为零，空文件为零。我能够知道问题是NSData我使用{{1} }是不正确的。但我无法解决它。请帮助我。

以下是我用来从邮件下载文件的代码

writeToFile

请帮我解决这个问题并告诉我我在哪里做错了。

提前致谢。

Answer 1

我用过这样的话：

＆＃13;

MCOIMAPFetchContentOperation * op = [self.imapSession fetchMessageByUIDOperationWithFolder:@"INBOX" uid:[sender tag]];

[op start:^(NSError * error, NSData * data)
{
    if ([error code] != MCOErrorNone)
    {
        return;
    }
    
    NSAssert(data != nil, @"data != nil");
    
    MCOMessageParser * msg = [MCOMessageParser messageParserWithData:data];
    
    if ([msg.attachments count] > 0)
    {
        MCOAttachment *attachment = [msg.attachments objectAtIndex:0];
        
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        
        NSString *saveDirectory = [paths objectAtIndex:0];
        NSLog(@"%@",attachment.filename);
        
        NSString *downLoadDirectory = [saveDirectory stringByAppendingString:@"/Downloads"];
        
        if (![[NSFileManager defaultManager] fileExistsAtPath:downLoadDirectory])
        {
            [[NSFileManager defaultManager] createDirectoryAtPath:downLoadDirectory withIntermediateDirectories:YES attributes:nil error:nil];
        }

        NSString *attachmentPath = [downLoadDirectory stringByAppendingPathComponent:attachment.filename];
        
        if ([[NSFileManager defaultManager] fileExistsAtPath:attachmentPath])
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message"
                                                            message:@"Fail Existed in Download Path."
                                                           delegate:self
                                                  cancelButtonTitle:@"OK"
                                                  otherButtonTitles:nil];
            [alert show];
        }
        else
        {
            BOOL res = [[attachment data] writeToFile:attachmentPath atomically:YES];
            
            if (res)
            {
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message"
                                                                message:@"Download Success /n Saved in Downloads"
                                                               delegate:self
                                                      cancelButtonTitle:@"OK"
                                                      otherButtonTitles:nil];
                [alert show];
            }
        }
    }
}];

＆＃13;

我希望它们有用。

无法成功从邮件中下载图像和PDF

1 个答案: