Qt Archive

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Qt: Q_OBJECT macro

Posted on January 12, 2012

I always thought that every class subclassing QObject must contain this macro but this is not completely right. More precisely it is only required if meta-object code has to be [...]

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Qt: set the main window title from everywhere

Posted on January 5, 2012

In Qt the title of the main window can be set from everywhere and thankfully to the QApplication class we gain access to all created widgets by using the method [...]

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Qt: error message telling the copy constructor is private

Posted on December 30, 2011

In the following code sample a singleton is implemented with a static instance getter which can be called in any other class. class MyClass{ public: static MyClass *instance(){ [...]

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Qt: QString constant in a class

Posted on December 24, 2011

A constant QString can be achieved by defining the macro #CONSTSTRING "-_-" and by creating a temporary QString instance in each place the constant is needed e.g. for a window title. ... window.setWindowTitle(QString(CONSTSTRING)); ... A lot [...]

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$I tried to compile a code looking like this: #ifndef CONTROLLER_H_ #define CONTROLLER_H_ #include class AbstractClass { public: virtual ~AbstractClass() {} virtual void update() = 0; }; class Controller : [...]$ 12
‘staticMetaObject’ is not a member

Posted on October 7, 2008

I tried to compile a code looking like this: #ifndef CONTROLLER_H_ #define CONTROLLER_H_ #include class AbstractClass { public: virtual ~AbstractClass() {} virtual void update() = 0; }; class Controller : [...]

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