iOS Question How download file with resumable feature?

[webhost.company]

I cannot resume a paused downloading file with OkHttp
Also I use below code but cannot resume downloading

#if b4i
#If OBJC

NSURLResponse *DownloadedResponse;
NSMutableData *DownloadedData;
NSString *FilePath;
NSURLConnection * connection2;
NSURLRequest *request;

- (void) cancel: (bool) on {
    [connection2 cancel];
}

-(void)Download: (NSString *)FileUrl :(UILabel *)LabelToSet :(NSString *)Directory :(NSString *)FileName :(NSArray *)Headers :(NSArray *)Values
{

    FilePath = [Directory stringByAppendingString: FileName];

    DownloadedData = [[NSMutableData alloc] init];
    NSURL *url = [NSURL URLWithString:FileUrl];
    request = [NSURLRequest requestWithURL:url];
    NSMutableURLRequest *mutableRequest = [request mutableCopy];

    NSUInteger count = [Headers count];
    for (NSUInteger i = 0; i < count; i++) {
        NSString * key = [Headers objectAtIndex: i];
           NSString * val = [Values objectAtIndex: i];
        [mutableRequest addValue:val forHTTPHeaderField:key];
    }
    
    request = [mutableRequest copy];
    NSURLConnection * connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
    connection2    =    connection;
  
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
   [DownloadedData appendData:data];
   float res = ((100.0/DownloadedResponse.expectedContentLength)*DownloadedData.length)/100;

   NSString * LabelText = [NSString stringWithFormat:@"%f", (res)];
   NSString * LabelText2 = [NSString stringWithFormat:@"%d", [DownloadedData length]];
  
   [self.bi raiseEvent:nil event:@"download_progress::" params:@[(LabelText),LabelText2]];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
   [DownloadedData writeToFile:FilePath atomically:YES];
   [self.bi raiseEvent:nil event:@"download_complete" params:@[]];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
   [self.bi raiseEvent:nil event:@"download_error:" params:@[error.localizedDescription]];
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
  DownloadedResponse = response;
}
#End If

In hug file, that is necessary to resume the downloading

 

[Semen Matusovskiy]

Why do you want to pause and resume manuaĺy ? It' s possible to use background urlsession - it works in foreground also and resumes automatically

 

[webhost.company]

Why do you want to pause and resume manuaĺy ? It' s possible to use background urlsession - it works in foreground also and resumes automatically

When the connection lost, downloading be fail and I have to resume that again from last byte downloaded

 

[Semen Matusovskiy]

Did you read https://developer.apple.com/documen...loading_system/pausing_and_resuming_downloads
First of all, important notice. Lost connection is not a problem for background urlsession.

 

[webhost.company]

Did you read https://developer.apple.com/documen...loading_system/pausing_and_resuming_downloads
First of all, important notice. Lost connection is not a problem for background urlsession.

How use urlsession in my code?

 

[Semen Matusovskiy]

I have no idea, what does your code.
My suggestion - to use as usual httpjob.Download and similar. But to change NSUrlSession, for example, in Application_Start.

Attached sample ... Press a button and switch to another app. Download will be done even in background. IOS selects a 'good' time, so a downloadload in background may take some additional time.

 

[aeric]

[B4X] RangeDownloader - resumable downloads

RangeDownloader uses http range feature to download the file in chunks. It will resume the download from the previous point, even if the app was previously killed. It first sends a HEAD request to test whether this feature is supported. Note that you need to delete the target file if you want to...

www.b4x.com