求和做公式 t=3 Qt=q1+q2+q3+q4q1q2q3q4是什么意思思

来源：蜘蛛抓取(WebSpider) 时间：2017-09-28 21:30 标签： q1 q2 q3
Qt Widgets 5.9
Qt Widgets
Qt Widgets
provides a set of UI elements to create classic desktop-style user interfaces. See the
overview for more information on using widgets.
Getting Started
To include the definitions of the module's classes, use the following directive:
#include &QtWidgets&
To link against the module, add this line to your
.pro file:
QT += widgets
Widgets are the primary elements for creating user interfaces in Qt.
can display data and status information, receive user input, and provide a container for other widgets that should be grouped together. A widget that is not embedded in a parent widget is called a .
class provides the basic capability to render to the screen, and to handle user input events. All UI elements that Qt provides are either subclasses of , or are used in connection with a
subclass. Creating custom widgets is done by subclassing
or a suitable subclass and reimplementing the virtual event handlers.
draw on behalf of widgets and encapsulate the look and feel of a GUI. Qt's built-in widgets use the
class to perform nearly all of their drawing, ensuring that they look exactly like the equivalent native widgets.
are a powerful mechanism that allows you to customize the appearance of widgets, in addition to what is already possible by subclassing .
are an elegant and flexible way to automatically arrange child widgets within their container. Each widget reports its size requirements to the layout through the
properties, and the layout distributes the available space accordingly.
is a powerful tool for interactively creating and arranging widgets in layouts.
Model/View Classes
architecture provides classes that manage the way data is presented to the user. Data-driven applications which use lists and tables are structured to separate the data and view using models, views, and delegates.
Graphics View
is for managing and interacting with a large number of custom-made 2D graphical items, and a view widget for visualizing the items, with support for zooming and rotation.
API Reference
These are links to the API reference materials.
(C) 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.
The documentation provided herein is licensed under the terms of the
as published by the Free Software Foundation.
Qt and respective logos are trademarks of The Qt Company Ltd.
in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners.13-12-31 &匿名提问
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通常在软件编译时出现的usr/bin/ld: cannot find -lxxx的错误，主要的原因是库文件并没有导入的ld检索目录中。
解决方式：
1。确认库文件是否存在，比如-l123, 在/usr/lib, /usr/local/lib,或者其他自定义的lib下有无lib123.so, 如果只是存在lib123.so.1,
那么可以通过ln -sv lib123.so.1 & lib123.so，建立一个连接重建lib123.so.
2。检查/etc/ld.so.conf中的库文件路径是否正确，如果库文件不是使用系统路径，/usr/lib, /usr/local/lib, 那么必须在文件中加入。
3。ldconfig 重建ld.so.cache文件，ld的库文件检索目录存放文件。尤其刚刚编译安装的软件，必须运行ldconfig，才能将新安装的
库文件导入ld.so.cache.
4。测试，gcc -l123 --verbose.
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