<![CDATA[Signal Handling]]>Hi all,

I want to know is it possible to catch a signal emitted from Linux terminal, through our Qt or qml application.? if yes, how can i do that ?

For ex, there is a simple code running in the background in linux terminal which will be passing a simple string through signal, i want to catch that and print the signal through my qt or qml application.
Thanks

]]>https://forum.qt.io/topic/83531/signal-handlingRSS for NodeMon, 21 Sep 2026 16:42:26 GMTFri, 22 Sep 2017 06:47:52 GMT60<![CDATA[Reply to Signal Handling on Sun, 13 Mar 2022 20:45:25 GMT]]>Hi...i am a new user here. As per my knowledge you could use QProcess to capture the terminal application's standard output, if you start it from your application. Signal & Slots is applicable within a process.Inorder to communicate between processes, use IPC mechanism.

one-stop pcb

]]>https://forum.qt.io/post/418812https://forum.qt.io/post/418812Sun, 13 Mar 2022 20:45:25 GMT<![CDATA[Reply to Signal Handling on Wed, 04 Oct 2017 04:43:44 GMT]]>@SGaist No actually i don't want to call a web service, i just want to get output from the code running within the iMX-6 board. so that i can call it through one of the API's from my HMI. So that i do not need to integrate the same with my HMI.

]]>https://forum.qt.io/post/418692https://forum.qt.io/post/418692Wed, 04 Oct 2017 04:43:44 GMT<![CDATA[Reply to Signal Handling on Sun, 01 Oct 2017 20:54:35 GMT]]>Then why do you need to catch signal from the terminal if you have to contact a web service ?

]]>https://forum.qt.io/post/418262https://forum.qt.io/post/418262Sun, 01 Oct 2017 20:54:35 GMT<![CDATA[Reply to Signal Handling on Sun, 01 Oct 2017 13:59:57 GMT]]>@SGaist Yes sir, like that only.

]]>https://forum.qt.io/post/418233https://forum.qt.io/post/418233Sun, 01 Oct 2017 13:59:57 GMT<![CDATA[Reply to Signal Handling on Thu, 28 Sep 2017 22:09:38 GMT]]>Do you mean contact a REST service to get the data ?

]]>https://forum.qt.io/post/417883https://forum.qt.io/post/417883Thu, 28 Sep 2017 22:09:38 GMT<![CDATA[Reply to Signal Handling on Thu, 28 Sep 2017 04:42:05 GMT]]>@SGaist Ya i can do that, in fact at present i hav integrated with my HMI, but i have a requirement that HMI layer should only have the UI part and should have API call for functions like ioT, music play etc.

]]>https://forum.qt.io/post/417699https://forum.qt.io/post/417699Thu, 28 Sep 2017 04:42:05 GMT<![CDATA[Reply to Signal Handling on Tue, 26 Sep 2017 21:09:52 GMT]]>Then, why not integrate that C code directly in your application ?

]]>https://forum.qt.io/post/417393https://forum.qt.io/post/417393Tue, 26 Sep 2017 21:09:52 GMT<![CDATA[Reply to Signal Handling on Tue, 26 Sep 2017 04:48:05 GMT]]>@SGaist

What are you reading from the board ?

I have an c code for IoT(Internet of things) which will be continuously running in that board and which gives output in the terminal, that i want to read through my program and make changes in my UI

]]>https://forum.qt.io/post/417182https://forum.qt.io/post/417182Tue, 26 Sep 2017 04:48:05 GMT<![CDATA[Reply to Signal Handling on Mon, 25 Sep 2017 22:34:34 GMT]]>What is that backend ?

What are you reading from the board ?

]]>https://forum.qt.io/post/417148https://forum.qt.io/post/417148Mon, 25 Sep 2017 22:34:34 GMT<![CDATA[Reply to Signal Handling on Mon, 25 Sep 2017 07:06:30 GMT]]>@SGaist

What kind of board is that ?

iMX-6 board.

What will you extract from it that you want to make available to other application(s) ?

I have an code running continuously in the backend, from which i want to read the output and based on that make some changes in my application UI.

How are you getting the data from that "lower level" ?

it will be giving the output in the terminal, from which i want to read.

Thanks

]]>https://forum.qt.io/post/416982https://forum.qt.io/post/416982Mon, 25 Sep 2017 07:06:30 GMT<![CDATA[Reply to Signal Handling on Mon, 25 Sep 2017 07:02:42 GMT]]>What kind of board is that ?

What will you extract from it that you want to make available to other application(s) ?

How are you getting the data from that "lower level" ?

]]>https://forum.qt.io/post/416979https://forum.qt.io/post/416979Mon, 25 Sep 2017 07:02:42 GMT<![CDATA[Reply to Signal Handling on Mon, 25 Sep 2017 06:41:55 GMT]]>@Naveen_D
Signal & Slots is applicable within a process.
Inorder to communicate between processes, use IPC mechanism.

I suggest, use your C code in worker thread and signal to main thread to update in UI.

]]>https://forum.qt.io/post/416966https://forum.qt.io/post/416966Mon, 25 Sep 2017 06:41:55 GMT<![CDATA[Reply to Signal Handling on Mon, 25 Sep 2017 04:56:12 GMT]]>@yuvaram Hi
Actually i want to know which will be better, I am new to it, Can you elaborate and tell how does it work.

]]>https://forum.qt.io/post/416947https://forum.qt.io/post/416947Mon, 25 Sep 2017 04:56:12 GMT<![CDATA[Reply to Signal Handling on Mon, 25 Sep 2017 04:54:47 GMT]]>@Naveen_D hi , do you want to communicate between process or within threads.

]]>https://forum.qt.io/post/416946https://forum.qt.io/post/416946Mon, 25 Sep 2017 04:54:47 GMT<![CDATA[Reply to Signal Handling on Mon, 25 Sep 2017 04:47:51 GMT]]>@SGaist
Hi,
I want to create an api which can connect to the embedded board's lower layer through which i want to get the output of the lower level code to my application UI.

For ex, i have a c code which will be running continuously at the board level and giving output, i want to create an api which will connect to this code and whenever i want i can take the output and display it in my application UI or make some changes based on that output in my UI.

]]>https://forum.qt.io/post/416945https://forum.qt.io/post/416945Mon, 25 Sep 2017 04:47:51 GMT<![CDATA[Reply to Signal Handling on Fri, 22 Sep 2017 20:49:40 GMT]]>Hi,

What exact signal do you have in mind ?

]]>https://forum.qt.io/post/416722https://forum.qt.io/post/416722Fri, 22 Sep 2017 20:49:40 GMT<![CDATA[Reply to Signal Handling on Fri, 22 Sep 2017 12:16:15 GMT]]>No, it is not. Signal/slot mechanism is really just a wrapper for a method call inside a process. You could use QProcess to capture the terminal application's standard output, if you start it from your application. (Or alternatively, use any standard Linux C++ code for that -- you should be able to find many examples of that.)

]]>https://forum.qt.io/post/416643https://forum.qt.io/post/416643Fri, 22 Sep 2017 12:16:15 GMT