Q_CHECK_PTR does nothing if QT_NO_DEBUG was defined during compilation. Example: int *a; Q_CHECK_PTR(a = new int[80]); // WRONG! a = new (nothrow) int[80]; // Right Q_CHECK_PTR(a); See also qWarning() and Debugging Techniques. Q_DECLARE_TYPEINFO ( Type, Flags ) You can...
第一种写法,字符串拼接,用的VC,单纯C++以前的写法,没有用Qt自带的QString操作,一直以为没有问题,这次使用时,经常会内存泄漏,没有明白。 查了一下:sprintf不是类型安全的,在执行的时候,它不会检查数组边界。所以当给其格式化一个比其大小还长的字符串时,就导致缓冲区溢出。 还找到一个函数:sprintf_s()是sprin...
This will create a global variable calledmyObjectin the script environment. The variable serves as a proxy to the underlying C++ object. Note that the name of the script variable can be anything; i.e., it is not dependent uponQObject::objectName(). ThenewQObject()function accepts two addi...
It is used in a namespace that has the Q_NAMESPACE macro, to declare that values of a given enum can be used as flags and combined using the bitwise OR operator. It is the same as Q_FLAG but in a namespace. The macro must be placed after the enum declaration. Note: The Q_FLAG...
Once you have updated your ASD, you should launch a clean instance of your implementation from the command line -- make sure not to load slime or anything else that creates threads. Then simply invoke(asdf:operate :build-op :system-name :force T). For sbcl, that would be: ...
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exp.setMinimal(true); 这儿匹配的是以-开头,以(结束的字符串 基本的QRegex 1.isValid()判断给定表达式是否合法 2.errorString()检错误和isValid()类似 3.isEmpty()判断正则表达式是否为空 4.caseSensitivity()检测大小写敏感 5.pattern()获取正则表达式本身 ...
(return-pressed))) (signal! main-window (name-set string) (q+:text name))) (define-slot (main-window name-set) ((new-name string)) (declare (connected main-window (name-set string))) (q+:qmessagebox-information main-window "Greetings" (format NIL "Good day to you, ~a!" new-...
If your geometry is simple and does not require interactive and hierarchical features, you should use QPainter directly. Use QGraphicsView for anything complex and interactive. DescriptionScreenshot Movable Image - We'll make a scene, and the scene will be shown with the elements we'll be addi...
Object Type Declaration [singleton]<TypeName><InitialVersion><File> Declares aQML object typeto be made available by the module. [singleton]Optional. Used to declare a singleton type. <TypeName>is the type being made available <InitialVersion>is the module version for which the type is to be...