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# Porting Guides

A number of guides and documents are available that cover porting issues, from detailed coverage of API differences between Qt 3 and Qt 4 to platform and tool-specific documentation.

Moving from QSA to Qt Script |
Moving from Qt 3 to Qt 4 | Porting advice for authors of new and existing Qt 3 applications.
Porting .ui Files to Qt 4 | Information about changes to the .ui file format in Qt 4.
Porting Qt Applications to Qtopia Core |
Porting to Graphics View | Hints and tips to assist with porting canvas applications to the Graphics View framework.
Porting to Qt 4 | An overview of issues and techniques to consider when porting from Qt 3 to Qt 4.
Porting to Qt 4 - Drag and Drop | An overview of the porting process for applications that use drag and drop.
Porting to Qt 4 - Virtual Functions | An overview of changes to virtual functions in Qt 4.
qt3to4 - The Qt 3 to 4 Porting Tool |