Qt Slot Not Being Called

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Describe the pull request:

• [ x] Bug fix
• [ ] Functional change
• [ ] New feature
• [ ] Code cleanup
• [ ] Build system change
• [ ] Documentation change
• [ ] Language translation

Pull request long description:

This PR solves a problem of missing signal/slots from QMLInterface. With the connect() being in the constructor that constructs a global object, there are no guarantee that the referenced objects are constructed, and thus sometimes leads to the connect not being successful. Unfortunate Qt does not report an error when this happens.

Solution was to move the connect() back into setup(), while keeping the nice lambda changes.

In contrary to what I wrote earlier, we (a student who writes a paper on clang and myself) have, out of scientific interest, examined the clang compiler (Xcode 11.3.1) compiling for iOS, other compilers might behave differently.

We found that the global space is created in 3 steps:1) all public const (we are still debating if a class const is added at this step, it seems to depend on compiler switches). These are created in a special const segment, and are created by the linker.2) all public global variables, including classes. The sequence seems very random, changing the compile order is no guarantee of changing the sequence of constructor calls. Linker allocates the global space needed, and the constructors are called as part of the startup code.3) all private static variables, including those hidden in e.g. instance(). Because instance()does: static *self = new ; return self;

self is a hidden (compiler scope is local) global object, and it is constructed before instance() is called. We have seen hints that some optimization switches might cause a delayed construct, but for debug it is constructed as part of the global space creation.4) main is called

Occasion kyburz seilwinde. The original: The 3-wheeled KYBURZ electric vehicles for postal delivery have become an integral part of the roadscape in many countries. KYBURZ is an international leader in high-quality mobility and transport solutions for the last mile.

Based on these finding, it seems like a good idea, never to reference parallel global objects in a global constructor (actually this is also taught here in the C++ class).

Qt Slot Not Being Called Like

Some of the reasons why this has not been detected before can be:1) most of the connects relate to the UI, and a missing change in a single graphical element is easily overlooked2) There are very little formal testing of the signal/slot (apart from qPref)3) Bulk of the connects are in desktop-widget, that connect a library (like e.g. core or backend-shared) to the UI, while QMLInterface interconnect signals.

remark, this was a practical study using Xcode 11.3.1 and IPadOS 13.1 simulator. I am sure reading the C++ specs contains some descriptions as well, but theory and practice are often two different pair of shoes.

Any positive comment and/or suggestions are mostly welcome.

Changes made:

Qt Slot Not Getting Called

Related issues:

Additional information:

Release note:

Documentation change:

Mentions:

该提问来源于开源项目：subsurface/subsurface

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Qt Connect Slot

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Pull request long description:

This PR solves a problem of missing signal/slots from QMLInterface. With the connect() being in the constructor that constructs a global object, there are no guarantee that the referenced objects are constructed, and thus sometimes leads to the connect not being successful. Unfortunate Qt does not report an error when this happens.

Solution was to move the connect() back into setup(), while keeping the nice lambda changes.

Slotman is a general surgeon in Vineland, New Jersey and is affiliated with multiple hospitals in the area. He has been in practice for more than 20 years.

In contrary to what I wrote earlier, we (a student who writes a paper on clang and myself) have, out of scientific interest, examined the clang compiler (Xcode 11.3.1) compiling for iOS, other compilers might behave differently.

We found that the global space is created in 3 steps:1) all public const (we are still debating if a class const is added at this step, it seems to depend on compiler switches). These are created in a special const segment, and are created by the linker.2) all public global variables, including classes. The sequence seems very random, changing the compile order is no guarantee of changing the sequence of constructor calls. Linker allocates the global space needed, and the constructors are called as part of the startup code.3) all private static variables, including those hidden in e.g. instance(). Because instance()does: static *self = new ; return self;

self is a hidden (compiler scope is local) global object, and it is constructed before instance() is called. We have seen hints that some optimization switches might cause a delayed construct, but for debug it is constructed as part of the global space creation.4) main is called

Occasion kyburz seilwinde. The original: The 3-wheeled KYBURZ electric vehicles for postal delivery have become an integral part of the roadscape in many countries. KYBURZ is an international leader in high-quality mobility and transport solutions for the last mile.

Based on these finding, it seems like a good idea, never to reference parallel global objects in a global constructor (actually this is also taught here in the C++ class).

Qt Slot Not Being Called Like

Some of the reasons why this has not been detected before can be:1) most of the connects relate to the UI, and a missing change in a single graphical element is easily overlooked2) There are very little formal testing of the signal/slot (apart from qPref)3) Bulk of the connects are in desktop-widget, that connect a library (like e.g. core or backend-shared) to the UI, while QMLInterface interconnect signals.

remark, this was a practical study using Xcode 11.3.1 and IPadOS 13.1 simulator. I am sure reading the C++ specs contains some descriptions as well, but theory and practice are often two different pair of shoes.

Any positive comment and/or suggestions are mostly welcome.

Changes made:

Qt Slot Not Getting Called

Related issues:

Additional information:

Release note:

Documentation change:

Mentions:

该提问来源于开源项目：subsurface/subsurface

• 点赞
• 收藏
• 回答

4个回复

加急问题

• 300上位机三菱MC协议程序范例，可以使用的那种，求助
• 300用手机拍取照片，如何实现对照片中的发光LED进行析别与提取？
• 300如何用C ++设计卷积码编码器？
• 300用monai做一个深度学习的基础检测
• 200关于霍兰德测评系统的逻辑求指点，感激！
• 200请问windows server 2019 的 web服务器如何设置某IP访问时，跳转到指定页面？
• 100u3d游戏检测模拟器，预算1W有大神帮忙解决么？
• 100关于引流、运营方面的，希望有擅长的程序员朋友能提供一点解决思路，拜谢！
• 100有关数字信号处理的一份作业，7点之前急求
• 100在Matlab中敲入冷热风温度，输出两个进风口的开启角度（即：角度根据不同的温度决定）

等你来答

• ios – 'React / RCTBridgeModule.h'文件未找到
  qq_26481895
• 各位大佬，我的波士顿房价预测为何在第七部分出现了负数？
  平淡的小茶杯

Qt Connect Slot

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• 去上叉的github仓库得到'意外的模块路径'错误
  duan36011个回答
• 在preg_replace输出中不计算时间
  doulanli61461个回答

I cannot for the life of me figure out how to use signals and slots to pass information to the GUI widget in an RQT plugin that is written in C++. The ROS Tutorial for creating a C++ RQT plugin doesn't even have any data widgets in the GUI, let alone any code to show how to use signals/slots to pipe data to a data widget: http://wiki.ros.org/rqt/Tutorials/Wri..

After several hours of trial and error, I was able to figure out a solution for using signals/slots in a Python RQT plugin, but I can't seem to make the stretch to C++.

Qt Slot Not Being Called

Here is the python example I created starting from the ROS Tutorial for creating a python RQT plugin ( https://github.com/lucasw/rqt_mypkg ) and then adding some of this code from ROS Answers where a user asked how to use signals/slots in python: http://answers.ros.org/question/22415..

Qt Slot Not Being Called Back

my_module.py: Slots vegas games free.

Qt Slot Not Being Called At A