blocks|key|356723|text|简而言之：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|356724|356725|Qt+4比Qt+3|unordered-list-item|356726|(甚至)更好、更强大、更灵活！|356727|356728|Porting+to+Qt+4+documentation提供了对API的许多小更改的一些想法。|offset|length|356729|What's+New+in+Qt+4概述了Qt3和Qt4之间的巨大差异。|356730|一些到目前为止还没有人提到的重大变化：|356731|356732|模型/视图architecture|356733|template容器类|356734|新的模块化生成系统|356735|新的基于操作的主窗口implementation|356736|widget样式|356737|+S60和其他平台的端口|356738|<代码>F221|356739|还有许多小的修复、改进和有用的新类，如QFormLayout和QSignalSpy。|356740|entityMap|0|LINK|mutability|MUTABLE|url|http://qt.nokia.com/doc/4.0/porting4.html|1|http://qt.nokia.com/doc/4.0/qt4-intro.html^0|0|0|0|0|0|0|T|0|0|0|I|1|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1J|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|1K|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1M|8|@]|9|@$K|1N|L|1O|1|1P]]|A|$]]|$1|M|3|N|5|6|7|1Q|8|@]|9|@$K|1R|L|1S|1|1T]]|A|$]]|$1|O|3|P|5|6|7|1U|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]|$1|R|3|S|5|E|7|1W|8|@]|9|@]|A|$]]|$1|T|3|U|5|E|7|1X|8|@]|9|@]|A|$]]|$1|V|3|W|5|E|7|1Y|8|@]|9|@]|A|$]]|$1|X|3|Y|5|E|7|1Z|8|@]|9|@]|A|$]]|$1|Z|3|10|5|E|7|20|8|@]|9|@]|A|$]]|$1|11|3|12|5|E|7|21|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|22|8|@]|9|@]|A|$]]|$1|15|3|16|5|6|7|23|8|@]|9|@]|A|$]]|$1|17|3|-4|5|6|7|24|8|@]|9|@]|A|$]]]|18|$19|$5|1A|1B|1C|A|$1D|1E]]|1F|$5|1A|1B|1C|A|$1D|1G]]]]

In a nutshell:

<ul>
<li>Qt 4 is (even) better -- and more powerful and flexible -- than Qt 3</li>
<li>you'll be fine!</li>
</ul>

The <a href="http://qt.nokia.com/doc/4.0/porting4.html" rel="noreferrer">Porting to Qt 4 documentation</a> gives some idea of the many small changes to APIs.

<a href="http://qt.nokia.com/doc/4.0/qt4-intro.html" rel="noreferrer">What's New in Qt 4</a> gives an overview of the big differences between Qt 3 and Qt 4.

Some major changes that noone has mentioned so far:

<ul>
<li>Model/View architecture</li>
<li>template container classes</li>
<li>a new, modular build system</li>
<li>a new action-based main window implementation</li>
<li>widget styling with CSS</li>
<li>ports for S60 and other platforms</li>
</ul>

There are also lots of small fixes, improvements and useful new classes such as QFormLayout and QSignalSpy.

blocks|key|1587310|text|您应该查阅诺基亚的Qt+books页面。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1587311|该页面上的两本书是免费提供的：|1587312|1587313|C%2B%2B+GUI+Programming+with+Qt+4+(first+edition)+by+Jasmin+Blanchette和Mark+Summerfield+|unordered-list-item|1587314|An+Introduction+to+Design+Patterns+in+C%2B%2B+with+Qt+4+by+Alan+Ezust，Paul+Ezust|1587315|1587316|entityMap|0|LINK|mutability|MUTABLE|url|http://qt.nokia.com/developer/books|1|http://blog.hartwork.org/?p=156|2|http://cartan.cas.suffolk.edu/oopdocbook/opensource/index.html^0|9|8|0|0|0|0|0|19|1|0|0|1F|2|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|13|8|@]|9|@]|C|$]]|$1|G|3|H|5|I|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|J|3|K|5|I|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|L|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]|W|$5|P|Q|R|C|$S|X]]]]

You should consult the <a href="http://qt.nokia.com/developer/books" rel="noreferrer">Qt books</a> page at Nokia.

Two books from that page are available freely:

<ul>
<li><a href="http://blog.hartwork.org/?p=156" rel="noreferrer">C++ GUI Programming with Qt 4 (first edition)</a> by Jasmin Blanchette and Mark Summerfield </li>
<li><a href="http://cartan.cas.suffolk.edu/oopdocbook/opensource/index.html" rel="noreferrer">An Introduction to Design Patterns in C++ with Qt 4</a> by Alan Ezust, Paul Ezust </li>
</ul>

blocks|key|1658041|text|Qt4中仍然存在Qt3支持类，但是Qt已经有了很大的发展。我认为使用你的Qt3书会减慢你的速度。你最好买本新书。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1658042|如果你不想花钱买一本书，例子、教程和文档都是非常有用的。|1658043|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Qt3 support classes still exist in Qt4 but Qt has developed itself very much. I think using your Qt3 book will slow you down. It is best if you buy a new book. 

If you don't want to spend money on a book, examples, tutorials &amp; documentations are very helpful.

blocks|key|1587349|text|您可以在Nokia's+site上找到包含所有差异的3到4个指南文档。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1587350|我会推荐一本Qt4而不是Qt3的书，但既然你已经使用过Qt，我认为你可以只使用文档就可以了。|1587351|entityMap|0|LINK|mutability|MUTABLE|url|http://qt.nokia.com/doc/4.0/porting4.html^0|4|C|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

You can find a 3 to 4 guidelines document with all the differences on <a href="http://qt.nokia.com/doc/4.0/porting4.html" rel="nofollow noreferrer">Nokia's site</a>. 

I would recommend a Qt 4 book to a Qt 3 one, but since you have already worked with Qt, I think that you can just use the docs and be ok.

blocks|key|1587509|text|大多数事情仍然非常相似。有一些清理，但基本的(例如，信号槽机制)保持不变。你仍然拥有所有这些QStrings，QActions，QDialogs等等。你的Qt3知识应该仍然有价值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1587510|另一方面，有许多新的元素。有一个很大的QGraphicsView框架，用于多媒体文件的Phonon框架，QtWebKit超文本标记语言引擎，用于多线程的QtConcurrent引擎等等。|1587511|Trolltech+(现在的名字是什么？)总是有很好的文档，所以请查看What's+new+in+Qt4，您应该可以使用API+reference获取最新的Qt4版本。|offset|length|1587512|entityMap|0|LINK|mutability|MUTABLE|url|http://qt.nokia.com/doc/4.5/qt4-intro.html|1|http://qt.nokia.com/doc/4.5/index.html^0|0|0|Z|H|0|1O|D|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$F|U|G|V|1|W]|$F|X|G|Y|1|Z]]|A|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]|P|$5|K|L|M|A|$N|Q]]]]

Most of the things remain quite similar. There was some cleanup, but the basics (signal-slot mechanism for example) remain the same. You still have all those QStrings, QActions, QDialogs etc. Your Qt3 knowledge should remain valuable.

On the other hand there are many new elements. There's a big QGraphicsView framework, Phonon framework for multimedia files, QtWebKit HTML engine, QtConcurrent engine for multithreading etc. You might want to learn all the new goodies.

Trolltech (what's the current name?) always has good documentation, so check <a href="http://qt.nokia.com/doc/4.5/qt4-intro.html" rel="nofollow noreferrer">What's new in Qt4</a> and you should be fine with <a href="http://qt.nokia.com/doc/4.5/index.html" rel="nofollow noreferrer">API reference</a> for the latest Qt4 version.

blocks|key|1587383|text|如果你知道Qt，这个http://qt.nokia.com/doc/4.5/classes.html应该可以适应。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1587384|要重定向到最新版本的Qt文档，请使用以下链接之一：http://doc.trolltech.com/latest/或http://qt.nokia.com/doc/latest/|1587385|entityMap|0|LINK|mutability|MUTABLE|url|http://qt.nokia.com/doc/4.5/classes.html|1|http://doc.trolltech.com/latest/|2|http://qt.nokia.com/doc/latest/^0|A|14|0|0|P|W|1|1M|V|2|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]|$A|Z|B|10|1|11]]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

If you know Qt, this
<a href="http://qt.nokia.com/doc/4.5/classes.html" rel="nofollow noreferrer">http://qt.nokia.com/doc/4.5/classes.html</a>
should be okay to get adapted.

For redirection to documentation for the latest version of Qt use one of the following links: <a href="http://doc.trolltech.com/latest/" rel="nofollow noreferrer">http://doc.trolltech.com/latest/</a> or <a href="http://qt.nokia.com/doc/latest/" rel="nofollow noreferrer">http://qt.nokia.com/doc/latest/</a>

blocks|key|181380|text|我建议您使用设计器一段时间，然后查看生成的代码。我用它来学习如何使用Qt4。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|181381|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I say you use the designer for a while and look at the generated code. I used it to learn how to work with Qt4.

blocks|key|356975|text|Qt4比Qt3更强大(特别是现在，Qt4.6已经临近，尽管Qt4.0有一些缺点)。您的Qt3知识将使您能够使用Qt4做基本的工作，因为基本功能的样式没有太多变化，但是要真正使用Qt4的所有功能，您需要学习特定于Qt4的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|356976|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Qt4 is much more powerful than Qt3 ever was (especially now, as Qt 4.6 draws near, even though Qt 4.0 had some shortcomings). Your knowledge of Qt3 will let you do basic stuff with Qt4 as the style hasn't changed much for basic functionality, but to truly use all the power of Qt4, you will need to learn things that are Qt4 specific.

I used to program in Qt3 a long time ago and I had read a great book that I still have by O'reilly on Qt3. I wanted to start using Qt4 again now several years later.

Can I use my Qt3 book to get up to speed again, or has things changed so much that I should buy a Qt4 book?

How different is Qt4 from Qt3?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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很久以前我用Qt3编程，我读过O‘’reilly在Qt3上写的一本很棒的书。几年后，我想再次开始使用Qt4。我可以使用我的Qt3书来再次提高速度吗?或者情况已经发生了很大变化，我应该买一本Qt4书？

问Qt4和Qt3有什么不同？
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