Blink window disappeared soon after it was opened ?

[kailotus]

Hello Everyone :
I used Blink to make Julia's GUI application. There is a code (BlinkApp.jl) as follows:

using Blink
w = Window()
body!(w, "Hello Blink")

When I use Julia REPL to execute:
Julia> include("BlinkApp.jl")
The Blink window can be displayed normally.

But when I use the MS Windows command prompt and give the command:
C:\Temp>julia BlinkApp.jl
I found that the window flickered and disappeared.
Has anyone ever had such a situation?
By the way, please ask how to solve this problem?
Thank you all.

[srgk26]

@kailotus I have the same problem too. Running Blink script from the command line doesn't work, though works from Julia REPL.

[pfitzseb]

You have to make sure that Julia stays alive after your script has run, e.g. by having your last statement be readline() or something like that.

[srgk26]

You have to make sure that Julia stays alive after your script has run, e.g. by having your last statement be readline() or something like that.

@pfitzseb Thank you, it works. But the problem is it also causes the terminal to be hung, cos the computer is waiting for a return value from readline(), which it never gets. I am trying to build an app that uses Blink, and using this method causes the app to crash, even though the terminal executable works fine. But that's only because terminal itself is hung.

I will try to work around that. But could there be a neater way to do this?

[pfitzseb]

I mean you could also try to spawn another Julia process that stays alive even if the explicitly started one dies, but this is fairly standard behaviour.

[twavv]

We should probably add a waitclosed-type function that blocks until the Window is closed (so that cleanup tasks can be performed). This would allow you to just include waitclosed(w) at the end of a Julia file to keep things open.

[mlhetland]

Is there an issue that relates to this waitclosed-type function, or has something like it been added? (If not, I guess you could reopen this issue as a placeholder?) Currently, the best solution I've found (cf. this Discourse post) for using Blink.jl in a script (and not the REPL) is:

while active(w)
    sleep(1)
end

Is there a more idiomatic way of doing this, at present?

[sina-masoud-ansari]

I had a similar issue with getting Interact.jl to work with Mux.jl from a script. One way to resolve the issue is to add the following to the end of the script:

Base.JLOptions().isinteractive==0 && wait()

Source: JuliaWeb/Mux.jl#73

waitclosed would be preferred though to allow cleanup as mentioned already.

[twavv]

#254