NUM(NSInteger, BMXMessageAttachment_DownloadStatus ) {<br>
                            
                            &nbsp;&nbsp; <a href="">BMXMessageAttachment_DownloadStatus_Downloaing</a>,<br>
                            
                            &nbsp;&nbsp; <a href="">BMXMessageAttachment_DownloadStatus_Successed</a>,<br>
                            
                            &nbsp;&nbsp; <a href="">BMXMessageAttachment_DownloadStatus_Failed</a>,<br>
                            
                  