Re: GUI updates do not show even from separate thread

[Fred Kiefer]

Hi Riccardo,

I tried to inspect this issue, but already failed in getting FTP.app to work 
against ftpmain.gnustep.org. Are there any ftp sites out there where you know 
the code is working correctly.
Next I looked at the code and failed to see the point where a background thread 
for the file download gets started. There is only one reference to NSThread in 
the code and this is at the startup. No idea what this code is doing there.

In AppController setTransferProgress: you are most likely referring to the line
[progBar setDoubleValue:percent];
This should indeed update the progress bar the next time GNUstep redraws the 
window. And even if you don't use a background thread the NSRunloop trick 
should be enough to trigger this. Without being able to get this working it is 
hard to say anything more. What you could try to find out is whether the 
drawRect: method of the progress indicator gets called at all. It could be that 
it is in a state where it just doesn't draw anything.

Fred

On the road

Am 04.07.2016 um 11:47 schrieb Riccardo Mottola <address@hidden>:

> Hi,
> 
> I have FTP - written quite a while ago.
> Easy access here:
> 
> https://github.com/gnustep/gap/tree/master/user-apps/FTP
> 
> The implementation - hopefully correct - is the following: the download 
> happens in a separate thread inside ftpclient.m which communicates back the 
> progress (advancement of the file being transferred).
> 
> The "progress" is shown with a ProgressBar and some text fields, quite simple.
> 
> On Mac, everything works like a charme! The progress bar is smooth and I see 
> the bytes and transfer speed!
> On GNUstep not: it is set at the beginning, then no updates until the end.
> 
> The critical method is:
> 
> - (oneway void)setTransferProgress:(NSNumber *)bytesTransferred
> 
> I added "oneway" yesterday - with no change in functionality if not a quite 
> good gain of speed on Mac: the worker thread doesn't block while actually 
> "updating" the GUI.
> 
> why do I have this issues on GNUstep? Any special care or tricks?
> Maybe I need to set the certain views to display or needs display on GS?
> 
> I already have this old trick:
> [[NSRunLoop currentRunLoop] runUntilDate:[NSDate distantPast]];
> 
> It shouldn't be needed with two threads I think.. and with or without no 
> effect.
> 
> Riccardo
> 
> 
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