Android Question Download more than one file at the same time (OkHttp)

[Devv]

Hi

    Dim job0 As HttpJob
    job0.Initialize("Job0", Me)
    job0.Download("http://example.com/file.zip")

How can i download http://example.com/file.zip , http://example.com/file2.zip ,http://example.com/file2.zip
at the same time using one job ?

 

[nwhitfield]

You can't. An HTTP request can only ever request one thing at a time. What you have to do is create multiple requests.

Create a simple (resumable) sub that downloads a file passed to it, and does whatever you need, and then call it three times.

downloadFile("http://example.com/file1.zip")
downloadFile("http://example.com/file2.zip")

Sub downloadFile ( url as string ) 
dim job as httpjob
job.initialize("",Me)
job.download(url)

wait for (job) JobDone ( job as HttpJob)
if job.success then
' do your sutff; maybe save it to File.DirInternal ?
end if
job.release
end sub

 

[Devv]

@nwhitfield
Great !
but how can i know in (jobdone) which file had been downloaded ?

 

[DonManfred]

In the code above YOU ALREADY KNOW the file you are downloading... It is the file you request a few lines earlier in the same sub!

https://www.b4x.com/android/forum/threads/b4x-okhttputils2-with-wait-for.79345/

You can add a parameter to the sub to give a destinationfilename
You can extract the filename from the url and use this

 

[Devv]

In the code above YOU ALREADY KNOW the file you are downloading... It is the file you request a few lines earlier in the same sub!

https://www.b4x.com/android/forum/threads/b4x-okhttputils2-with-wait-for.79345/

You can add a parameter to the sub to give a destinationfilename
You can extract the filename from the url and use this

ok how can i know if all the jobs is completed ?

 

[nwhitfield]

Lots of ways - and to an extent it depends what you're doing with the files afterwards. You could, for example, have a global integer, set it to zero, and have the sub increment it by one each time you finish processing the file.*

Or if you know what the files will be called (say, you're going to save them with particular names to the internal memory) then you might just check to see if all those files have appeared yet.

* I'm wondering about a race condition here? I don't know if that's possible in B4A; it might be better to have a list containing a map for each file name, with the name, and the download status. So after the wait for , you'd add an item to the list with something like

DownloadedFiles.Add(CreateMap("file" : url, "downloaded" : job.success))

Then elsewhere in your code, you can check to see the size of the DownloadedFiles list, and iterate over it to see if all the files did download correctly

 

[Devv]

thanks guys appreciate you help