编译或运行时出现的错误及解决（Errors and solutions at compile or run time）.docVIP

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编译或运行时出现的错误及解决（Errors and solutions at compile or run time）.doc

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编译或运行时出现的错误及解决（Errors and solutions at compile or run time）

编译或运行时出现的错误及解决（Errors and solutions at compile or run time） Many wrong here is a small mistake, or even lower, but when it happens you will always get confused, spend half a day do not know in the end there was wrong. L All of the code is running under qt3.3.8+fedora8. 1. compile time error: constructor x * * is private /usr/lib/qt-3.3/include/qwidget.h:, In, copy, constructor, CDishTypePage:: CDishTypePage (const, CDishTypePage): /usr/lib/qt-3.3/include/qwidget.h:738: error: QWidget:: QWidget (const QWidget) is private Cdishtypepage.h:10: error: in this context Cmainformboard.cpp: In constructor CMainFormBoard:: CMainFormBoard (QWidget*, const, char*): Cmainformboard.cpp:14: note: here, for the first time, you need to generate the method CDishTypePage:: CDishTypePage (const, CDishTypePage) Cmainformboard.cpp:14: error: initializing temporary from result of CDishTypePage:: CDishTypePage (QWidget*, const, char*) Solve： The error occurred because no pointer was used to define a class object: CDishTypePage, dishTypePage = new, CDishTypePage (this, dishTypePage); Should be changed into: CDishTypePage, *dishTypePage = new, CDishTypePage (this, dishTypePage); 2. the following error occurred during run time: The exception to floating numbers is mostly because of the exception of 0 Segment errors are mostly due to the use of null pointers, such as the member functions that have not been initialized before the object is initialized The reason for the illegal instructions should be many. Ive only encountered one case at a time: the qDebug output QString object was not converted before, as follows: QDebug (typeid=%s, typeID); Shall be written: QDebug (typeid=%s, typeID.ascii ()); 3. compile errors: variables * * have initial values, but types are incomplete Ccommfunctions.cpp:17: error: the variable QImage qimage has initial values, but the type is incomplete Ccommfunctions.cpp:17: error: invalid, use, of, undefined, type, struct, QImage /usr/lib/qt-3.3/include/qwindowdefs.h:7