ios 圖片上傳

//分界線的標識符        NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";        //根據url初始化request        NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]                                                               cachePolicy:NSURLRequestReloadIgnoringLocalCacheData                                                           timeoutInterval:10];        //分界線 --AaB03x        NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];        //結束符 AaB03x--        NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];        //要上傳的圖片        UIImage *image=[params objectForKey:@"pic"];        //得到圖片的data        NSData* data = UIImagePNGRepresentation(image);        //http body的字串        NSMutableString *body=[[NSMutableString alloc]init];        //參數的集合的所有key的集合        NSArray *keys= [params allKeys];                 //遍曆keys        for(int i=0;i<[keys count];i++)        {            //得到當前key            NSString *key=[keys objectAtIndex:i];            //如果key不是pic，說明value是字元類型，比如name：Boris            if(![key isEqualToString:@"pic"])            {                //添加分界線，換行                [body appendFormat:@"%@\r\n",MPboundary];                //添加欄位名稱，換2行                [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];                //添加欄位的值                [body appendFormat:@"%@\r\n",[params objectForKey:key]];                        }        }                 ////添加分界線，換行        [body appendFormat:@"%@\r\n",MPboundary];        //聲明pic欄位，檔案名稱為boris.png        [body appendFormat:@"Content-Disposition: form-data; name=\"pic\"; filename=\"boris.png\"\r\n"];        //聲明上傳檔案的格式        [body appendFormat:@"Content-Type: image/png\r\n\r\n"];                 //聲明結束符：--AaB03x--        NSString *end=[[NSString alloc]initWithFormat:@"\r\n%@",endMPboundary];        //聲明myRequestData，用來放入http body        NSMutableData *myRequestData=[NSMutableData data];        //將body字串轉化為UTF8格式的二進位        [myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];        //將image的data加入        [myRequestData appendData:data];        //加入結束符--AaB03x--        [myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];                 //設定HTTPHeader中Content-Type的值        NSString *content=[[NSString alloc]initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];        //設定HTTPHeader        [request setValue:content forHTTPHeaderField:@"Content-Type"];        //設定Content-Length        [request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];        //設定http body        [request setHTTPBody:myRequestData];        //http method        [request setHTTPMethod:@"POST"];                   //建立串連，設定代理        NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];                 //設定接受resp*****e的data        if (conn) {            mResp*****eData = [[NSMutableData data] retain];        }