Qt Overview (C++ GUI development framework)
Qt 是奇趣科技于 1991 年开发的跨平台 C++ 图形用户界面 GUI 应用程序开发框架，采用 LGPL (GNU Lesser General Public License) 和商业许可授权协议。
Qt 向开发者提供了建立艺术级图形用户界面所需的全部功能，可开发 GUI 程序，也可开发非 GUI 程序，譬如：控制台工具、服务器。
Digitser 产品和微软OS/VisualStudio Python Qt/C/C++ 关系
Visual Studio Build Tools 2017 2019 for VC build compilation tools
Qt 开发框架是面向对象的，使用 MOC (Meta Object Compiler 元对象编译器) 特殊代码生成扩展及一些宏，易于扩展，允许组件编程。
Qt LTS (Long Term Supported 长支持版) 支持长达 3 年，在这段时间内，会持续提供更新和 Bug 修复。
基本上，Qt 同 X11 上的 GTK、Motif、Openwin 和 Windows 上的 MFC OWL VCL ATL 是同类型相似技术。
但 Qt 支持更多平台、面向对象且模块化程度更高、非常丰富的 API、支持 2D/3D 图形渲染、支持 OpenGL、大量开发文档、支持 XML、等。
Qt 包括多达 250 个以上的 C++ 类，还替供基于模板的 collections serialization file I/Odevice directorymanagement date/time 类，甚至还包括正则表达式、等。
Qt 提供了一种称为 signals/slots (信号/槽) 的机制来替代 callback (回调)，这使得各对象之间的协同变得非常简单。
| Time | Version | Explanation | Remark |
|---|---|---|---|
| 2022.04 | 6.3.0 | 重引入 Qt PDF 模块 | |
| 2021.11 | 5.12.12 | ||
| 2021.09 | 6.2.0 | ||
| 2021.05 | 6.1.0 | ||
| 2021.02 | 6.0.1 | ||
| 2020.12 | 6.0.0 | Removed Qt Multimedia Widgets |
Build using CMake 不再支持微软 Windows 7 |
| 2020.11 | 5.15.2 | ||
| 5.12.10 | |||
| 2020.10 | 5.15.1 | ||
| 2020.06 | 5.12.9 | ||
| 2020.05 | 5.15.0 | New Qt PDF module | Open source users need to own compile and build the binary installation package |
| 2020.04 | 5.12.8 | ||
| 2020.03 | 5.14.2 | ||
| 2020.01 | 5.14.1 | ||
| 5.12.7 | |||
| 2019.12 | 5.14.0 | ||
| 5.9.9 | |||
| 2019.11 | 5.13.2 | ||
| 2019.09 | 5.13.1 | ||
| 2019.06 | 5.13 |
Begin to support PDF OpenSSL1.1 QtWebEngine pop-up local document links are not supported (by default) |
No longer supported MSVC2015 Remove module QtCanvas3D Minimum support Android5.0 Java21 |
| 2018.12 | 5.12 | Add QtRemoteObjects | QtWebEngine compile minimum support MSVC2017 |
| 2018.05 | 5.11 | Begin to support MSVC2017 | |
| 2017.12 | 5.10 | ||
| 2017.05 | 5.9 | PCRE1 library is no longer supported | No longer supported Windows8.1 RT |
| 2017.01 | 5.8 | No longer compatible with C++98, fully support C++11 | |
| 2016.03 | 5.6 | ||
| 2015.12 | 4.8.7 | End of support | |
| 2015.07 | 5.5 | Fully support Android Mac OS X iOS Linux backend | |
| 2014.12 | 5.4 | Added Chromium-based QtWebEngine to realize HTML5 hybrid development | Last version that supports WebKit |
| 2014.05 | 5.3 | ||
| 2014.04 | Released the official version of Qt Creator 3.1.0 | ||
| 2013.12 | 5.2 | Release Qt for iOS | |
| 2013.07 | 5.1 | ||
| 2012.08 | Nokia sells Qt software business to Finnish IT services company Digia | NOKIA stopped Meltemi system development, QT department was disbanded | |
| 2011.02 | Release Qt for Android (Alpha) | ||
| 2011 | Digia acquires Qt commercial rights from Nokia | From then on Nokia is responsible for Qt on Mobile, Qt Commercial is responsible for Digia | |
| 2009.12 | 4.6 | ||
| 2009.05 | Open the Qt source code library to the public | Enable Git and Gitorious open source project web source code management system | |
| 2009.03 | 4.5 | ||
| 2008 | Nokia acquires Qt from Trolltech | Add LGPL license | |
| 2000.10 | Start using GPL license | ||
| 2000.09 | 2.2 | ||
| 2000.03 | Release embedded Qt | ||
| 1999.06 | 2.0 | ||
| 1999.03 | 1.44 | Release QPL1.0 | |
| 1998.07 | 1.40 | Release KDE1.0 | |
| 1998.04 | Trolltech programmers migrate Netscape5.0 from Motif to Qt within 5 days | Established KDE Free Qt Foundation | |
| 1996 | Matthias Ettrich creates the KDE project | Matthias is currently working for the Nokia Qt development framework | |
| 1995 | First released | ||
| 1994 | Established Trolltech Technology Company | ||
| 1991 | Haavard Nord and Eirik Chambe-Eng start developing Qt | Support X11 and Windows |
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