Android Question (SOLVED) - Is it possible to return more than 1 value in Resumable Subs?

Myr0n · Nov 14, 2019

Hi everybody

Is it possible to return moren than 1 value in resumable subs like

B4X:

Dim SenderFilter As Object = sql.ExecQueryAsync("SQL", "SELECT * FROM table1", Null)

Wait For (SenderFilter) SQL_QueryComplete (Success As Boolean, rs As ResultSet) '<=== like 
SQL_QueryComplete

if yes, how can I do it?

Thank you

Brandsum · Nov 14, 2019

It depends upon the method signature which you are waiting for.

Myr0n · Nov 14, 2019

Well i would love to know how to implement a method signature to return 2 values or more from a custom method.

Thx

DonManfred · Nov 14, 2019

Put them both into a map and return the map.
As far as i know you can not return multiple values from a sub. Not in a normal way and even not in a resumeable sub.

Myr0n · Nov 14, 2019

DonManfred said:
Put them both into a map and return the map.
As far as i know you can not return multiple values from a sub. Not in a normal way and even not in a resumeable sub.

Is exactly what I am doing, but i was thinking to implement a solution like the jdbcsql library works.

Thx

EnriqueGonzalez · Nov 14, 2019

yes it is possible. think this:

Myr0n said:
Wait For (SenderFilter) SQL_QueryComplete (Success As Boolean, rs As ResultSet) '<=== like

as a simple Sub. how do you call a sub then? with Callsub3 and Callsubdelayed3 (better the later)

B4X:

private sub yourSub
wait for yourResumableSub_Complete(args1 as int, args2 as int)

end sub

private sub yourAnotherSub
do something... 
callsubdelayed3(me,"yourResumableSub_complete",args1,args2)
end sub

just watch out i did not test the code.

Myr0n · Nov 14, 2019

Enrique Gonzalez R said:
yes it is possible. think this:

as a simple Sub. how do you call a sub then? with Callsub3 and Callsubdelayed3 (better the later)

B4X:

private sub yourSub wait for yourResumableSub_Complete(args1 as int, args2 as int) end sub private sub yourAnotherSub do something... callsubdelayed3(me,"yourResumableSub_complete",args1,args2) end sub

just watch out i did not test the code.

I gonna try and i get back to you.

Thx

Erel · Nov 14, 2019

Another option is to return an array:

B4X:

Sub DoSomething As ResumableSub
 Return Array(1, 2, "c")
End Sub

Wait For (DoSomething) Complete (Result() As Object)
Log(Result(2))

Myr0n · Nov 14, 2019

Thank you so much for everyone.

Sandman · Nov 14, 2019

Erel said:
Another option is to return an array

And if you do it like this, you don't even need to use Wait For, surely? I mean, we can just return the array as-is.

Erel · Nov 14, 2019

Sandman said:
And if you do it like this, you don't even need to use Wait For, surely?

Wait For is needed because we assume that DoSomething is a resumable sub. There is no other reason to use Wait For.

B4X:

Sub DoSomething As ResumableSub
 'Download something
 'wait for result
 Return Array(1, 2, "c")
End Sub

LiK137 · Nov 14, 2019

What about returning pointer to structure type? not possible?

Erel · Nov 14, 2019

This is indeed a good idea to use a custom type.

B4X:

Dim res As MyResultType
res.Field1 = Value1
res.Field2 = Value2
Return res

'....
Wait For (DoSomething) Complete (Result As MyResultType)

Android Question (SOLVED) - Is it possible to return more than 1 value in Resumable Subs?

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