Question

在尝试session.dataTaskWithRequest使用某个函数从URL读取gzip时遇到问题。服务器端将.gzip更改为.bin并存储文件。我想用.bin读取文件。但是，网络连接丢失。

但是，将发生The network connection was lost错误。你能告诉我如何解决这个问题吗？

服务器端文件名：xxx.bin（此bin文件是gzip文件。）

以下代码：

NSURLSessionConfiguration *config = [NSURLSessionConfiguration 
defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:config];

NSURL *url = [NSURL URLWithString:@"http://...../xxx.bin"];

NSURLSessionDataTask *task = [session dataTaskWithURL: url
    completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        if (error) {
            NSLog(@"error [%@]", [error localizedDescription]);

        }
        else {
            NSLog(@"success");

        }
    }];

[task resume];

Answer 1

You can try two steps of codes to download and extract zip files.   

 //Fetching zip file from server
    -(void)dataSyncFileDonload{
        NSString *stringURL = [NSString stringWithFormat:@"http://yourzipfilecontainedURL"];
        stringURL =  [stringURL stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]];
        NSURL  *url = [NSURL URLWithString:stringURL];
        NSData *urlData = [NSData dataWithContentsOfURL:url];
        [self extractDownloadedZipFile:urlData];
    }
    //File Extraction from Zip file
    -(void)extractDownloadedZipFile:(NSData *)data {

        //If you are using SQlite and storing in local directory for extraction
        NSData *outputData = [data gunzippedData];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *path = [paths  objectAtIndex:0];
        NSString *dataPath = [path stringByAppendingPathComponent:@"myAppDB.sql"];
        NSString *dataPath1 = [path stringByAppendingPathComponent:@"myAppDB.sql.gz"];
        dataPath = [dataPath stringByStandardizingPath];
        [outputData writeToFile:dataPath atomically:YES];
        [data writeToFile:dataPath1 atomically:YES];
        [self readExtractedFile:dataPath];
    }

    //Read upzip file
    -(void)readExtractedFile:(NSString *)filepath loaderPercent:(float)loaderPercent loaderTo:(float)loaderTo{
        NSData *fileData = [NSData dataWithContentsOfFile:filepath];//destinationPath
        NSString *fileString = [[NSString alloc] initWithData:fileData encoding:NSASCIIStringEncoding];
        NSArray* allLinedStrings = [fileString componentsSeparatedByCharactersInSet: [NSCharacterSet newlineCharacterSet]];
        //You can use you data now.
    }

无法下载gzip文件的bin文件

1 个答案: