qstring | 易学教程

Totalview get the value of QString

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When I double clicked on QString object in totalview debugger this window appears. How can I get the exact value of it. I have tried command.toUtf8().constData() but it prints Cannot find name "toUtf8" . ::TV::TTF::RTF::build_struct_transform { name {^struct QString$} members { { ascii { $wstring_u16 cast { * { d -> unicode } } } } } } ::TV::TTF::RTF::build_struct_transform { name {^struct QString$} members { { ascii { $wstring_u16 cast {* {d -> data} } } } } } Add this to $HOME/.tvdrc flie. First is for Qt3 and second for Qt4 . For QT5 please add the following to the file $HOME/.tvdrc ::TV:

Qt元对象(Meta-Object)系统与反射

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反射 -在计算机科学中，反射是指计算机程序在运行时（Run time）可以访问、检测和修改它本身状态或行为的一种能力。[1]用比喻来说，反射就是程序在运行的时候能够“观察”并且修改自己的行为。要注意术语“反射”和“内省”（type introspection）的关系。内省（或称“自省”）机制仅指程序在运行时对自身信息（称为元数据）的检测；反射机制不仅包括要能在运行时对程序自身信息进行检测，还要求程序能进一步根据这些信息改变程序状态或结构。 C++的反射 C++的标准语法是不提供反射的特性的，不过随着C++17的定稿，估计这个关键词不会加到标准中了。不过这个我们可以用template来实现，这次就不写template了。今天主要是讲的是Qt。 Qt的反射 Qt最大的特点就是增加了moc的过程，个人理解，Qt扩展了C++的语法，以及增强了自己的基本库。 Meta Object System is a part of Qt framework core provided to support Qt extensions to C++ like signals/slots for inter-object communication, run-time type information, and the dynamic property system.[1] Architecture

label vc

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#pragma once #include <QWidget> #include <QPaintEvent> #include <QPainter> #include <QPixmap> #include <QBrush> #include <QPen> #include <QRect> #include <QImage> #include <QMouseEvent> #include <QDebug> #include <QString> #include <QPoint> #include <QInputDialog> #include <QMessageBox> #include <vector> #include "vcpoint.h" class VCImgWidget :public QWidget { Q_OBJECT public: VCImgWidget(QWidget *parent); ~VCImgWidget(); void paintEvent(QPaintEvent *event); void paintEvent1(QPaintEvent *event); //const QString imgName = NULL; void SetImgName(QString imgNameParam); QString GetImgName(); std:

QAxBase: Error calling IDispatch member LineStyle: Unknown error

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word/Excel版本2007、2010。 wps也适用。 //borders->dynamicCall("SetLineStyle(int,int,int)", 0, 0, 1); //报错 borders->dynamicCall("SetLineStyle(int)", 0); //不报错--不显示边框 borders->dynamicCall("SetLineStyle(int)", 1); //显示边框 //设置表格边框 for (int i=1;i<=6;i++) { QString m_str = QString("Borders(-%1)").arg(i); QAxObject *borders = table->querySubObject(m_str.toLatin1().constData()); borders->dynamicCall("SetLineStyle(int)", 0); //不显示边框 } 来源： https://www.cnblogs.com/azbane/p/11968961.html

用Qt实现一个计算器

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一· 介绍目的：做一个标准型的计算器。用于学习Qt基础学习。平台： Qt 5.12.0 二· 结构框架设计 2.1最终产品样式界面的设计大体按照win系统自带的计算器做模仿。左边是win7 的界面。本次项目是为了熟悉Qt的界面设计，取消掉一些复杂的计算，和一些比较花样的布局。最终实现右边图样的界面。 2.2 架构规则弱耦合，强内聚，业务逻辑与界面逻辑一定要分离模块之间使用接口进行关联模块之间的关系必然是单项依赖，最大力度避免循环依赖关系 2.3 框架结构计算器一定包含界面类和后台计算类。按照上述规则，设计如下：一个界面类 IOCalculator；一个后台计算的类 QCalculatorDec；一个接口类，用来连接界面类和后台业务计算类 QcalculatorUI；一个完整的计算机类 Qcalculator；（实现上述三个类的融合，对外就是一个计算器类）三· 接口类的设计接口类主要是实现界面类与业务逻辑的通信。最主要的有两个内容从界面类中得到用户输入的计算公式。由计算公式得到计算结果。接口类只提供接口，UI 类使用该接口。业务逻辑类负责具体的实现。类的结构为： class IOCalculator { public: virtual bool expression(const QString& exp )=0; virtual

QChar to wchar_t

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问题 I need to convert a QChar to a wchar_t I've tried the following: #include <cstdlib> #include <QtGui/QApplication> #include <iostream> using namespace std; int main(int argc, char** argv) { QString mystring = "Hello World\n"; wchar_t myArray[mystring.size()]; for (int x=0; x<mystring.size(); x++) { myArray[x] = mystring.at(x).toLatin1(); cout << mystring.at(x).toLatin1(); // checks the char at index x (fine) } cout << "myArray : " << myArray << "\n"; // doesn't give me correct value return 0;

How to get substring from a string in qt?

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问题 I have a text form: Last Name:SomeName, Day:23 ...etc From Last Name:SomeName, I would like to get Last Name, and separately SomeName. I have tried to use QRegularExpression, QRegularExpression re("(?<label>\\w+):(?<text>\\w+)"); But I am getting the result: QString label = match.captured("label") //it gives me only Name What I want is whatever text till ":" to be label, and after to be text. Any ideas? 回答1: You could use two different methods for this, based on your need: split() section()

Why do QString and vector<unique_ptr<int>> appear incompatible here?

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I'm trying to compile some code, which reduces to this: #include <memory> #include <vector> #include <QString> class Category { std::vector<std::unique_ptr<int>> data; QString name; }; int main() { std::vector<Category> categories; categories.emplace_back(); }; Compiled as is, it results in the following error from g++ and similar for clang++: In file included from /opt/gcc-4.8/include/c++/4.8.2/memory:64:0, from test.cpp:1: /opt/gcc-4.8/include/c++/4.8.2/bits/stl_construct.h: In instantiation of ‘void std::_Construct(_T1*, _Args&& ...) [with _T1 = std::unique_ptr<int>; _Args = {const std:

Get plain text from QString with HTML tags

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I have QString with html tags. Why can i get plain text from this string? laurent You need to strip off the HTML tags from the string. See this post for instance. str.remove(QRegExp("<[^>]*>")); 来源： https://stackoverflow.com/questions/5999967/get-plain-text-from-qstring-with-html-tags

解析定位标签数据

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void anasysData(QByteArray baRevDataParam) { int Datalen = sizeof(stuDevData); int Revlen = baRevDataParam.size(); int num = 0; int remainder = Revlen%Datalen;//求余 if (remainder != 0) { qDebug() << QString::fromLocal8Bit("数据错误"); return ""; } num = Revlen / Datalen; if (num > 0) { //收到的16进制数先转成字符串 QString Hexstr = baRevDataParam.toHex().toUpper(); QByteArray ba = Hexstr.toLatin1(); uint8_t *pbuf = (uint8_t *)baRevDataParam.data(); stuDevData *stuData = (stuDevData*)pbuf; int tagID = stuData->TAG_ID; int serialNum = stuData->seq_num; int x_value = stuData->pos[0]; int y_value = stuData->pos[1];