can't download bin file for gzip file - ios

Question

I have a problem while trying to session.dataTaskWithRequest in a function to read gzip from URL.
The server side changes .gzip to .bin and stores the file.
I want to read the file with .bin. However, The network connection was lost.
However, a The network connection was lost error will occur.
Could you tell me how to solve this problem?
Server side file name: xxx.bin (this bin file is a gzip file.)
Following the code:
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.
}