Android Question Use Httpjob to build your own B4A library

[b4a programmer]

Hi,
I want to create a library using the standard class where a file should be downloaded, so I decide to use httpjob in my library, but I do not know how to initialize httpjob because by giving Me the target input in the class, the force program will close. Give.
Please help. Thankful

 

[ilan]

can you post your code? or maybe a simple example that demonstrates what you are doing? it will be simpler to help you

 

[b4a programmer]

can you post your code? or maybe a simple example that demonstrates what you are doing? it will be simpler to help you

here you are.
In fact, my intention is to build a library in which a download can be made.
Please check the attached sample and describe the solution.
Thankful

 

[ilan]

your mistake is in this line

    Wait For (j) JobDone(j As HttpJob)

you declare at the top the httpJob as "http" so you need to wait when "http" is executed and not if j (that is the response httpjob)

just change this line to:

Wait For (http) JobDone(j As HttpJob)

 

[b4a programmer]

your mistake is in this line

    Wait For (j) JobDone(j As HttpJob)

you declare at the top the httpJob as "http" so you need to wait when "http" is executed and not if j (that is the response httpjob)

just change this line to:

Wait For (http) JobDone(j As HttpJob)

Yes, you are right, but I also changed this line, but force close still occurs.
I think in a standard class "Me" can not be given as a Target to httpjob.

 

[Erel]

I think in a standard class "Me" can not be given as a Target to httpjob.

It can.

 

[b4a programmer]

It can.

Thank you very much for your answer
When httpjob is defined in a standard class it cannot do its job properly
Please download the sample source and resolve this issue.
Earl, thank you very much for your efforts

 

[ilan]

why are you changing the standard b4a context?

the error you get is very clear:

Error description: Initialize sub cannot be resumable.

change your class to this:

Public Sub initialize
    download
End Sub

Public Sub download
    Private http As HttpJob
    http.Initialize("http",Me)
    http.Download("https://cdn.shortpixel.ai/client/q_glossy,ret_img/https://www.b4x.com/basic4android/images/dopus_NucbTJkLV0.png")
   
    Wait For (http) JobDone(j As HttpJob)
    If j.Success Then
        Log("yes")
    Else
        Log("no")
    End If
    j.Release
End Sub

call the class like this:

    Private a As MyLibrary
    a.initialize

 

[Erel]

1. You cannot delete the Initialize method. The Initialize2 you created is a regular sub.
2. You must call Initialize, which can't be a resumable sub.

 

[ilan]

btw i would do the download in the initialize sub. i would create another sub named .download and cal this function after i initialize the class.

EDIT: there is an excellent example by Erel that shows how to download an image: https://www.b4x.com/android/forum/threads/b4x-okhttputils2-with-wait-for.79345/

 

[b4a programmer]

why are you changing the standard b4a context?

the error you get is very clear:


change your class to this:

Public Sub initialize
    download
End Sub

Public Sub download
    Private http As HttpJob
    http.Initialize("http",Me)
    http.Download("https://cdn.shortpixel.ai/client/q_glossy,ret_img/https://www.b4x.com/basic4android/images/dopus_NucbTJkLV0.png")
  
    Wait For (http) JobDone(j As HttpJob)
    If j.Success Then
        Log("yes")
    Else
        Log("no")
    End If
    j.Release
End Sub

call the class like this:

    Private a As MyLibrary
    a.initialize

God bless you. My problem was solved.
Thank you as well as Earl

 

[josejad]

as well as Earl