The Q_OBJECT macro at the beginning of the class definition is necessary for all classes that define signals or slots 只有加入了Q_OBJECT,你才能使用QT中的signal和slot机制. 比如编写事件接口等程序时,有时会出现如下问题: 在PC端成功编译,但在开发板端却显示错误: QObject::connect: No such slot QWidget::*******(…
Ref https://doc.qt.io/archives/qq/qq16-dynamicqobject.html Trolltech | Documentation | Qt Quarterly Dynamic Signals and Slotsby Eskil Abrahamsen Blomfeldt Signals and slots are declared at compile-time, and normally you cannot add new signals and slo…
The Transition from Qt 4.x to Qt 5 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 configu…
Contents Tutorial Hello, World Command-Line Arguments Finding Duplicate Lines A Web Server Loose Ends Program Structure Names Declarations Variables Assignments Type Declarations Packages and Files Scope Basic Data Types Integers Floating-Point Numbe…
枚举部分 Enumeration part 使用枚举我们可以定义一些有名字的数字常量. 枚举通过 enum关键字来定义. Using enumerations, we can define some numeric constants with names. Enumeration is defined by the enum keyword. enum Direction { Up = 1, Down, Left, Right } 枚举是在运行时真正存在的一个对象,其中一个原因是因为这样可以从…
