从Qt4x升级至Qt5工程代码需做的改变.doc

从Qt4.x升级至Qt5工程代码需做的改变 分类： Qt 2013-07-28 00:31197人阅读评论(0)收藏举报 目录(?)[+] 原文链接：点击打开链接 The transition from Qt 4.x to Qt 5 is not expected to be significant. However, the “modularization” of the Qt code base requires some amount of changes to project configuration, such as use of “headers”, and configuration of project build settings (such as changes to the *.pro files). Qt Creator (master) is compiled using Qt 4 and Qt 5; you can refer to its sources to get an overview of what is required to port an application and keep the sources backwards compatible to Qt 4. QtWidgets as a Separate Module example compile time errors error: QMainWindow: No such file or directory error: QToolButton: No such file or directory error: QWidget: No such file or directory Solution Add this in your *.pro file: QT += widgets Change all instances of #include QtGui to #include QtWidgets The code should work now, though sometimes you may require to be more explicit: #include QtWidgets/QToolButton QtWebKitWidgets is also a separate module: example compile time errors error: invalid use of incomplete type class QWebFrame error: forward declaration of class QWebFrame Solution Add this in your *.pro file: QT += webkitwidgets Note: when you have QT += webkitwidgets you don’t need QT += widgets In addition, replace all instances of #include QtWebKit to #include QtWebKitWidgets You can try this by porting a WYSISWYG html editor [] from Qt 4 to Qt 5. QPrinter Doesn’t Work If your code has the following lines: #include QPrinter #include QPrintDialog add the following to your project file: QT += printsupport Again, sometimes it may not work and you would need to be explicit: #include QtPrintSupport/QPrinter #include QtPrintSupport/QPrintDialog toAscii() and fromAscii() Methods are deprecated Replace all instances of fromAscii() toAscii() to fromLatin1() toLatin1() For example, given the Qt 4 code QByteArray configfileti = TMP_Config.toAscii(); you would change to QByteArray configfilet