A null string is a string that is initialized using QString's default constructor or by passing (const char *)0 to the constructor. An empty string is any string with size 0. A null string is always empty, but an empty string isn't necessarily null: QString().isNull(); // returns...
QStandardItemModel model; QStandardItem *parentItem = model.invisibleRootItem(); for (int i = 0; i < 4; ++i) { QStandardItem *item = new QStandardItem(QString("item %0").arg(i)); parentItem->appendRow(item); parentItem = item; } After setting the model on a view, you typically ...
In addition, QStringList provides a few convenience functions that make handling lists of strings easier: Initializing The default constructor creates an empty list. You can use the initializer-list constructor to create a list with elements: QStringList fonts = { "Arial", "Helvetica", "Times"...
process.waitForFinished(-1);// 等待另一个程序运行结束}else{qWarning()<<"启动另一个程序时出错1"<< process.error();qWarning()<<"启动另一个程序时出错"<< process.errorString(); } QObject::connect(&w,SIGNAL(destroyed()), &a,SLOT(quit()));returna.exec(); } 回到顶部 “Calling a priv...
qstring.h /*** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Copyright (C) 2016 Intel Corporation. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtCore module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** ...
public default constructor public copy constructor public destructor 使用Q_DECLARE_METATYPE(T)时类型T(包括指针类型)必须是完全定义的,正常情况下就在类型定义之后注册,或者在每次 都要包含的私有头文件中。 对于前置声明类型的指针可以使用宏Q_DECLARE_OPAQUE_POINTER(),之后可以正常注册。
QStringListModel 根据Qt帮助文档中的解释,QStringListModel是一个可编辑的模型,可用于需要在视图小部件(如QListView或QComboBox)中显示许多字符串的简单情况。 下面是使用的代码以及效果展示: QStringListModel *m_listModel_2 = new QStringListModel; ...
; virtual int qt_metacall(QMetaObject::Call, int, void **); static inline QString ...
explicit Object(QString name, QObject *parent = 0):QObject(parent) { m_name = name; setObjectName(m_name); connect(this, SIGNAL(ageChanged(int)), this, SLOT(onAgeChanged(int))); connect(this, SIGNAL(scoreChanged(int)), this, SLOT(onScoreChanged(int))); ...
QString是Qt中使用很频繁的类,它提供了一个Unicode构成的字符串 The QString class provides a Unicode character string QString 由 QChars 组成 ,每个字符是16位,即 2 Byte QString stores a string of 16-bit QChars, where each QChar corresponds one Unicode 4.0 character. (Unicode characters with cod...