Qprocess signal slot
Qt provides several ways to implement Inter-Process Communication allowing a signal emitted by one process to be connected to a slot in another QProcess Class. Hi, I have make an IPC with DBus between two applications. The main app start the second application. I need to receive signal from the second app and do something with my slot in the main app. GitHub is where people build software. More than 28 million people use GitHub to discover, fork, and contribute to over 85 million projects.
Here's part of the code: Starts the given program in a new process, passing the command line arguments in arguments. QProcess Class The cross-platform class QProcess can be used to start external programs as child processes, and to communicate with them. Returns true on success; otherwise returns false. Or in the Qt5 convention:.
Qt QProcess Tutorial
I can't receive signal because I use QProcess:: Yes, I receive communications between my applications but i use QProcess:: So the signal is not processed. I don't understand something here. There shouldn't be problem with processing signals, unless you messed something with DBus implementation. I have forget that start is asynchronous. It works well, without waitforStarted but I need to use this method.
Only users with topic management privileges can see it. Reply Quote 0 0 Replies Last reply. Hi, What do you mean by "receive a signal from the second app"? Since you're using DBus all communication between your two applications should go through it. Need programmers to hire? There's something that's not clear at all here: You say that you use DBus for the communication between your tow applications You say that you want a signal from an app that runs in a QProcess Now you need to use waitForStarted So please: Loading More Posts 6 Posts.
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I have a class which is called Canbus. This class is called from within my Mainwindow. Now I have another function in this class which is called dataReady. I wish to do the following:. I used this before when I was working only into the mainwindow.
If I want to connect those to in a class, how shouldI do this? So I have no idea on how to connect the signal and the slot in a class. I searched in the documentation of qt but I don't understand it completely. You can even look at this webinar from ICS. Upvote the answer s that helped you to solve the issue Use the "Topic Tools" button to mark your post as Solved Add screenshots via postimage.
Yes indeed that would be the best way. The issue is that I'm developping this for an embedded system which only support qt4. So I can't use it. JonB Yes that I tried as well. I did the following:. Canbus must derive from QObject. And you should do your connect before QProcess:: And you should wait for process to finish until proceeding further. I hope you are not going to interpret the output of candump in your application to receive CAN frames!
Only users with topic management privileges can see it. Dear all, This is probably a very stupid question, but I can't get my head around it. I wish to do the following: The following file is my canbus. Thanks in advance, Kind regards, Toon Mertens. Reply Quote 0 1 Replies Last reply. That's why I'm setting this up. I did the following: Then I get the following error: Reply Quote 1 0 Replies Last reply. Loading More Posts 7 Posts. Reply Reply as topic.
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