Qt First Impression: QT is a cross-platform C application framework, similar to MFC, ATL, .NET framework, including a set of runtime mechanisms, development tools, and a huge library; difference with them: QT support Many platforms are committed to achieving: source code does not move, recompile to complete the platform transplant.
Qt "Business / Open Source" parallel way, you can download the open source Qt, Qt / Embedded, Qtopia, Qtopia Desktop, but must work under GPL; you can also purchase a Lissens to Trolltech, Trolltech will give you a complete software. Edition, so your software can be closed, charge, etc., use trolltech: if you're open source, qt is open source. If're Commercial, Qt is Commercial.
There is only 3 books of QT, only 3 of ChinaPub, 4 this, and there are "GUI Programming With Qt3" recommended by Trolltech; as for QT / Embedded and qtopia's book less, even no.
Qtopia is an Application implementation in QT in the Linux / Embedded Linux version. Similar to QT, Qtopia also has multiple versions, mobile phones, PDA, consumer electronic version (CEP).
Qtopia Mobile Edition Overview: http://www.bmrtech.com/xiazai/qtopia_phone_overview_cn.pdfqt Signal and Slot Mechanism Description: http://www-900.ibm.com/developerWorks/cn/linux/guitoolkit/qt/signal -Slot / Index.SHTMLQT multi-thread programming: http://www-900.cn.ibm.com/developerWorks/cn/linux/L-QT-MTHRD/index.shtmlqt internal process communication mechanism: http: / / www-900.cn.ibm.com/developerWorks/cn/Linux/L-QTCOMMU/index.shtmlqt International Programming: http://www-900.cn.ibm.com/developerworks/cn/linux/guitoolkit/ Qt / I18n / index.shtml