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Date: Wed, 25 Mar 2020 14:13:28 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
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To: "PAULUS, Raimund, TI-ABN" <Raimund DOT Paulus AT dillinger DOT biz>,
        cygwin AT cygwin DOT com
Subject: Re: Problems using Qt5 and Apache Thrift
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Greetings, PAULUS, Raimund, TI-ABN!

> Problems using Qt5 and Apache Thrift

...snip...

> Now i want to implement the interface parts with Qt 5. Here is the new program sequence:

> //------------------------------------------------------------------------------
> program starts
> step 1: make the connection to the Linux server (Apache Thrift)
> step 2: initialize Qt interface (create widgets, buttons, ...)
> step 3: user interface (Qt)
> step 4: data transfer PC <-> Linux-Host (Apache Thrift)
> step 5: user interface (Qt)
> step 6: data transfer PC <-> Linux-Host (Apache Thrift)
> ...
> ...
> ...
> step n-1: end Qt app
> step n: close the connection to the host (Apache Thrift)
> program ends
> //------------------------------------------------------------------------------

> During step 2 the connection to the linux server is broken. You can see it
> with the netstat command. First error message arises in step 4:

> "TSocket::write_partial() send() <Host: my_host Port: 9090>Broken pipe"

I strongly suggest placing communication service in its own thread.
Then you could manage connection without having to worry about blocking
timeouts caused by GUI operations.
They will run asynchronously.

> On a Linux box the client program runs perfectly.

Only by coincidence, I suppose.

> On the windows box the program works, if i initalize Qt before the
> connection to the server is made (step 2 before step 1). But that is not
> acceptable for me, because afterwards other widgets and buttons are created
> and i can not close and create the connection at each point.

I suppose, the server dropping connection by timeout. But I'd urge you to
investigate this further.

> For the tests I used the examples from the Apache Thrift Tutorial.

Please include examples as text/plain attachments, if they are longer than a
few lines.


-- 
With best regards,
Andrey Repin
Wednesday, March 25, 2020 14:08:25

Sorry for my terrible english...

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