• HTTPS SSL配置

  • 下载
  • 配置

• 子父对象

QTimer *timer = new QTimer; // QTimer inherits QObject timer->inherits("QTimer"); // returns true timer->inherits("QObject"); // returns true timer->inherits("QAbstractButton"); // returns false

• 文件权限

extern Q_CORE_EXPORT int qt_ntfs_permission_lookup; qt_ntfs_permission_lookup++; // turn checking on qt_ntfs_permission_lookup--; // turn it off again QFile::Permissions pers; QFile file("D:/DOWN/f.txt"); file.open(QFile::ReadOnly); pers =file.permissions(); qDebug() <<pers; file.setPermissions(QFile::ReadOwner); qDebug() <<file.permissions(); file.setPermissions(pers);

• QMediaPlayer本地解码器

WIN上下载k-lite或者LAV Filters安装即可。

• GC

// 创建实例 QObjectCleanupHandler *cleaner = new QObjectCleanupHandler; // 创建窗口 QPushButton *w = new QPushButton("Remove Me"); w->show(); // 注册第一个按钮 cleaner->add(w); // 如果第一个按钮点击之后，删除自身 connect(w, SIGNAL(clicked()), w, SLOT(deleteLater())); // 创建第二个按钮，注意，这个按钮没有任何动作 w = new QPushButton("Nothing"); cleaner->add(w); w->show(); // 创建第三个按钮，删除所有 w = new QPushButton("Remove All"); cleaner->add(w); connect(w, SIGNAL(clicked()), cleaner, SLOT(deleteLater())); w->show();

• 弱指针

// QPointer 表现类似普通指针 QDate *mydate = new QDate(QDate::currentDate()); QPointer mypointer = mydata; mydate->year(); // -> 2005 mypointer->year(); // -> 2005 // 当对象 delete 之后，QPointer 会有不同的表现 delete mydate; if(mydate == NULL) printf("clean pointer"); else printf("dangling pointer"); // 输出 dangling pointer if(mypointer.isNull()) printf("clean pointer"); else printf("dangling pointer"); // 输出 clean pointer

• 内置图标

QStyle::SP_TitleBarMenuButton

• pro文件解析

宏定义

• QScroller

ui->listWidget->setHorizontalScrollMode(QListWidget::ScrollPerPixel); QScroller::grabGesture(ui->listWidget,QScroller::LeftMouseButtonGesture);

• 代码重构

• QtCreator软件的配置文件

C:\Users\Administrator\AppData\Roaming\QtProject

• QtCreator UI

• 守护进程

/*为了使得兼容任意程序，特意提炼出来共性，增加了多种设置。 可设置检测的程序名称。 可设置udp通信端口。 可设置超时次数。 自动记录已重启次数。 自动记录最后一次重启时间。 是否需要重新刷新桌面。 可重置当前重启次数和最后重启时间。 自动隐藏的托盘运行或者后台运行。 提供界面设置程序名称已经开启和暂停服务。*/ 1#pragma execution_character_set("utf-8") 2#include "frmmain.h" 3#include "ui_frmmain.h" 4#include "qtimer.h" 5#include "qudpsocket.h" 6#include "qsharedmemory.h" 7#include "qprocess.h" 8#include "qdatetime.h" 9#include "qapplication.h" 10#include "qdesktopservices.h" 11#include "qmessagebox.h" 12#if (QT_VERSION > QT_VERSION_CHECK(5,0,0)) 13#include "qstandardpaths.h" 14#endif 15 16#include "app.h" 17 18frmMain::frmMain(QWidget *parent) : QWidget(parent), ui(new Ui::frmMain) 19{ 20 ui->setupUi(this); 21 this->initForm(); 22} 23 24frmMain::~frmMain() 25{ 26 delete ui; 27} 28 29void frmMain::changeEvent(QEvent *event) 30{ 31 //隐藏当前界面,最小化到托盘 32 if(event->type() == QEvent::WindowStateChange) { 33 if(windowState() & Qt::WindowMinimized) { 34 hide(); 35 } 36 } 37 38 QWidget::changeEvent(event); 39} 40 41void frmMain::initForm() 42{ 43 count = 0; 44 ok = false; 45 46 //每秒钟定时询问心跳 47 timerHeart = new QTimer(this); 48 timerHeart->setInterval(2000); 49 connect(timerHeart, SIGNAL(timeout()), this, SLOT(sendHearData())); 50 51 //从6050端口开始,如果绑定失败则将端口加1,直到绑定成功 52 udp = new QUdpSocket(this); 53 int port = 6050; 54 while(!udp->bind(port)) { 55 port++; 56 } 57 58 connect(udp, SIGNAL(readyRead()), this, SLOT(readData())); 59 60 if (App::TargetAppName.isEmpty()) { 61 ui->btnStart->setText("启动"); 62 ui->btnStart->setEnabled(false); 63 timerHeart->stop(); 64 } else { 65 ui->btnStart->setText("暂停"); 66 ui->btnStart->setEnabled(true); 67 timerHeart->start(); 68 } 69 70 ui->txtAppName->setText(App::TargetAppName); 71 ui->txtAppName->setFocus(); 72} 73 74void frmMain::sendHearData() 75{ 76 udp->writeDatagram("hello", QHostAddress::LocalHost, App::TargetAppPort); 77 78 //判断当前是否没有回复 79 if (!ok) { 80 count++; 81 } else { 82 count = 0; 83 ok = false; 84 } 85 86 //如果超过规定次数没有收到心跳回复,则超时重启 87 if (count >= App::TimeoutCount) { 88 timerHeart->stop(); 89 90 QSharedMemory mem(App::TargetAppName); 91 if (!mem.create(1)) { 92 killApp(); 93 } 94 95 QTimer::singleShot(1000 , this, SLOT(killOther())); 96 QTimer::singleShot(3000 , this, SLOT(startApp())); 97 QTimer::singleShot(4000 , this, SLOT(startExplorer())); 98 } 99} 100 101void frmMain::killApp() 102{ 103 QProcess *p = new QProcess; 104 p->start(QString("taskkill /im %1.exe /f").arg(App::TargetAppName)); 105} 106 107void frmMain::killOther() 108{ 109 QProcess *p = new QProcess; 110 p->start(QString("taskkill /im %1.exe /f").arg("WerFault")); 111 112 //重建缓存,彻底清除托盘图标 113 if (App::ReStartExplorer) { 114 QProcess *p1 = new QProcess; 115 p1->start("taskkill /f /im explorer.exe"); 116 } 117} 118 119void frmMain::startApp() 120{ 121 if (ui->btnStart->text() == "开始" || ui->btnStart->text() == "启动") { 122 count = 0; 123 return; 124 } 125 126 QProcess *p = new QProcess; 127 p->start(QString(""%1/%2.exe"").arg(qApp->applicationDirPath()).arg(App::TargetAppName)); 128 129 count = 0; 130 ok = true; 131 timerHeart->start(); 132 133 App::ReStartCount++; 134 App::ReStartLastTime = QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss"); 135 App::writeConfig(); 136 137 ui->labCount->setText(QString("已重启 %1 次").arg(App::ReStartCount)); 138 ui->labInfo->setText(QString("最后一次重启在 %1").arg(App::ReStartLastTime)); 139} 140 141void frmMain::startExplorer() 142{ 143 //取得操作系统目录路径,指定操作系统目录下的explorer程序,采用绝对路径,否则在64位操作系统下无效 144#if (QT_VERSION > QT_VERSION_CHECK(5,0,0)) 145 QString str = QStandardPaths::writableLocation(QStandardPaths::ApplicationsLocation); 146#else 147 QString str = QDesktopServices::storageLocation(QDesktopServices::ApplicationsLocation); 148#endif 149 150 if (App::ReStartExplorer) { 151 str = QString("%1\\Windows\\explorer.exe").arg(str.mid(0, 2)); 152 QProcess *p = new QProcess(this); 153 p->start(str); 154 } 155} 156 157void frmMain::readData() 158{ 159 QByteArray tempData; 160 do { 161 tempData.resize(udp->pendingDatagramSize()); 162 udp->readDatagram(tempData.data(), tempData.size()); 163 QString data = QLatin1String(tempData); 164 if (data.right(2) == "OK") { 165 count = 0; 166 ok = true; 167 } 168 } while (udp->hasPendingDatagrams()); 169} 170 171void frmMain::on_btnOk_clicked() 172{ 173 App::TargetAppName = ui->txtAppName->text(); 174 if (App::TargetAppName == "") { 175 QMessageBox::critical(this, "提示", "应用程序名称不能为空!"); 176 ui->txtAppName->setFocus(); 177 return; 178 } 179 180 App::writeConfig(); 181 ui->btnStart->setEnabled(true); 182} 183 184void frmMain::on_btnStart_clicked() 185{ 186 count = 0; 187 if (ui->btnStart->text() == "暂停") { 188 timerHeart->stop(); 189 ui->btnStart->setText("开始"); 190 } else { 191 timerHeart->start(); 192 ui->btnStart->setText("暂停"); 193 } 194} 195 196void frmMain::on_btnReset_clicked() 197{ 198 App::ReStartCount = 0; 199 App::ReStartLastTime = "2019-01-01 12:00:00"; 200 App::writeConfig(); 201 202 ui->txtAppName->setText(App::TargetAppName); 203 ui->labCount->setText(QString("已重启 %1 次").arg(App::ReStartCount)); 204 ui->labInfo->setText(QString("最后一次重启在 %1").arg(App::ReStartLastTime)); 205 QMessageBox::information(this, "提示", "重置配置文件成功!"); 206} 主程序使用核心代码： 1#include "applive.h" 2#include "qmutex.h" 3#include "qudpsocket.h" 4#include "qstringlist.h" 5#include "qapplication.h" 6#include "qdatetime.h" 7#include "qdebug.h" 8 9#define TIMEMS qPrintable(QTime::currentTime().toString("HH:mm:ss zzz")) 10 11QScopedPointer<AppLive> AppLive::self; 12AppLive *AppLive::Instance() 13{ 14 if (self.isNull()) { 15 QMutex mutex; 16 QMutexLocker locker(&mutex); 17 if (self.isNull()) { 18 self.reset(new AppLive); 19 } 20 } 21 22 return self.data(); 23} 24 25AppLive::AppLive(QObject *parent) : QObject(parent) 26{ 27 udpServer = new QUdpSocket(this); 28 29 QString name = qApp->applicationFilePath(); 30 QStringList list = name.split("/"); 31 appName = list.at(list.count() - 1).split(".").at(0); 32} 33 34void AppLive::readData() 35{ 36 QByteArray tempData; 37 38 do { 39 tempData.resize(udpServer->pendingDatagramSize()); 40 QHostAddress sender; 41 quint16 senderPort; 42 udpServer->readDatagram(tempData.data(), tempData.size(), &sender, &senderPort); 43 QString data = QLatin1String(tempData); 44 45 if (data == "hello") { 46 udpServer->writeDatagram(QString("%1OK").arg(appName).toLatin1(), sender, senderPort); 47 } 48 } while (udpServer->hasPendingDatagrams()); 49} 50 51bool AppLive::start(int port) 52{ 53 bool ok = udpServer->bind(port); 54 if (ok) { 55 connect(udpServer, SIGNAL(readyRead()), this, SLOT(readData())); 56 qDebug() << TIMEMS << "Start AppLive Ok"; 57 } 58 59 return ok; 60} 61 62void AppLive::stop() 63{ 64 udpServer->abort(); 65 disconnect(udpServer, SIGNAL(readyRead()), this, SLOT(readData())); 66}

• Qt密钥生成器

在很多商业软件中，需要提供一些可以试运行的版本，这样就需要配套密钥机制来控制，纵观大部分的试用版软件，基本上采用以下几种机制来控制。 远程联网激活，每次启动都联网查看使用时间等，这种方法最完美，缺点是没法联网的设备就歇菜了。 通过获取本地的硬盘+CPU等硬件的编号，做一个运算，生成一个激活码，超过半数的软件会采用此方法，缺点是不能自由控制软件的其他参数，比如软件中添加的设备数量的控制。 设定一个运行到期时间+数量限制+已运行时间的密钥文件，发给用户配套软件使用，缺点是如果仅仅设置的是运行到期时间，用户可以更改电脑时间来获取更长的使用时间，在电脑不联网的情况下。 本demo采用抛砖引玉的形式，用第三种方法来实现，密钥文件采用最简单的异或加密，可以自行改成其他加密方法。 核心代码： 1#include "frmmain.h" 2#include "ui_frmmain.h" 3#include "qmessagebox.h" 4#include "qfile.h" 5 6frmMain::frmMain(QWidget *parent) : QWidget(parent), ui(new Ui::frmMain) 7{ 8 ui->setupUi(this); 9 this->initForm(); 10} 11 12frmMain::~frmMain() 13{ 14 delete ui; 15} 16 17void frmMain::initForm() 18{ 19 QStringList min; 20 min << "1" << "5" << "10" << "20" << "30"; 21 for (int i = 1; i <= 24; i++) { 22 min << QString::number(i * 60); 23 } 24 25 ui->cboxMin->addItems(min); 26 ui->cboxMin->setCurrentIndex(1); 27 ui->dateEdit->setDate(QDate::currentDate()); 28 29 for (int i = 5; i <= 150; i = i + 5) { 30 ui->cboxCount->addItem(QString("%1").arg(i)); 31 } 32} 33 34QString frmMain::getXorEncryptDecrypt(const QString &data, char key) 35{ 36 //采用异或加密,也可以自行更改算法 37 QByteArray buffer = data.toLatin1(); 38 int size = buffer.size(); 39 for (int i = 0; i < size; i++) { 40 buffer[i] = buffer.at(i) ^ key; 41 } 42 43 return QLatin1String(buffer); 44} 45 46void frmMain::on_btnOk_clicked() 47{ 48 bool useDate = ui->ckDate->isChecked(); 49 bool useRun = ui->ckRun->isChecked(); 50 bool useCount = ui->ckCount->isChecked(); 51 52 if (!useDate && !useRun && !useCount) { 53 if (QMessageBox::question(this, "询问", "确定要生成没有任何限制的密钥吗?") != QMessageBox::Yes) { 54 return; 55 } 56 } 57 58 QString strDate = ui->dateEdit->date().toString("yyyy-MM-dd"); 59 QString strRun = ui->cboxMin->currentText(); 60 QString strCount = ui->cboxCount->currentText(); 61 QString key = QString("%1|%2|%3|%4|%5|%6").arg(useDate).arg(strDate).arg(useRun).arg(strRun).arg(useCount).arg(strCount); 62 63 QFile file(QApplication::applicationDirPath() + "/key.db"); 64 file.open(QFile::WriteOnly | QIODevice::Text); 65 file.write(getXorEncryptDecrypt(key, 110).toLatin1()); 66 file.close(); 67 QMessageBox::information(this, "提示", "生成密钥成功,将 key.db 文件拷贝到对应目录即可!"); 68} 69 70void frmMain::on_btnClose_clicked() 71{ 72 this->close(); 73}

• MiniDump

• 扩展库

• 获取硬件信息

QString frmMain::getWMIC(const QString &cmd) { //获取cpu名称：wmic cpu get Name //获取cpu核心数：wmic cpu get NumberOfCores //获取cpu线程数：wmic cpu get NumberOfLogicalProcessors //查询cpu序列号：wmic cpu get processorid //查询主板序列号：wmic baseboard get serialnumber //查询BIOS序列号：wmic bios get serialnumber //查看硬盘：wmic diskdrive get serialnumber QProcess p; p.start(cmd); p.waitForFinished(); QString result = QString::fromLocal8Bit(p.readAllStandardOutput()); QStringList list = cmd.split(" "); result = result.remove(list.last(), Qt::CaseInsensitive); result = result.replace("\r", ""); result = result.replace("\n", ""); result = result.simplified(); return result; } QString frmMain::getCpuName() { return getWMIC("wmic cpu get name"); } QString frmMain::getCpuId() { return getWMIC("wmic cpu get processorid"); } QString frmMain::getDiskNum() { return getWMIC("wmic diskdrive where index=0 get serialnumber"); }

• QProcess使用

bat进程启动运行 QProcess process; process.start("del /s *.txt"); // same as process.start("del", QStringList() << "/s" << "*.txt"); 空格不用管在要执行的路径前和后加上双引号就可以。 比如process.start("D:\Program Files\XiaZaiBa.exe"); 写成process.start("\"D:\Program Files\XiaZaiBa.exe\"");就可以了。 process.setWorkingDirectory( "./subdir" ); process.start( QApplication::applicationDirPath() + "subdir/sub.exe" ); 不用vbs的bat启动，给入监控端口参数启动 QProcess process; QProcessEnvironment env = QProcessEnvironment::systemEnvironment(); env.insert("TMPDIR", "C:\\MyApp\\temp"); // Add an environment variable process.setProcessEnvironment(env); process.start("myapp"); //启用VBS脚本 wscript.exe //system("WScript.exe ../engine/HideRun.vbs"); SHELLEXECUTEINFOA ShExecInfo; ShExecInfo.cbSize = sizeof(SHELLEXECUTEINFOA); ShExecInfo.fMask = SEE_MASK_NOCLOSEPROCESS; ShExecInfo.hwnd = NULL; ShExecInfo.lpVerb = NULL; ShExecInfo.lpFile = "I:/QTCreator/meidayunpan/prj_meida/git_lsx/MideaDisk/engine/aria2c.exe"; ShExecInfo.lpParameters = "--conf-path=aria2.conf";//传出去的参数 ShExecInfo.lpDirectory = NULL; ShExecInfo.nShow = SW_SHOW; ShExecInfo.hInstApp = NULL; BOOL b_ret = ShellExecuteExA(&ShExecInfo); QProcess* process = new QProcess(this); process->start("../engine/aria2c.exe", QStringList() << "--conf-path=aria2.conf"); QObject::connect(process, SIGNAL(errorOccurred(QProcess::ProcessError)), this, SLOT([&](QProcess::ProcessError){ switch (error) { case QProcess::FailedToStart: QMessageBox::information(0, "FailedToStart", "FailedToStart"); break; case QProcess::Crashed: QMessageBox::information(0, "Crashed", "Crashed"); break; case QProcess::Timedout: QMessageBox::information(0, "FailedToStart", "FailedToStart"); break; case QProcess::WriteError: QMessageBox::information(0, "Timedout", "Timedout"); break; case QProcess::ReadError: QMessageBox::information(0, "ReadError", "ReadError"); break; case QProcess::UnknownError: QMessageBox::information(0, "UnknownError", "UnknownError"); break; default: QMessageBox::information(0, "default", "default"); break; } })); //启动 QObject::connect(process, SIGNAL(started()), this, SLOT([&](){ QMessageBox::information(0, "start", "start"); })); //状态改变 QObject::connect(process, SIGNAL(stateChanged(QProcess::ProcessState)), this, SLOT([&](QProcess::ProcessState newState){ QMessageBox::information(0, "startChange", QString::number(newState)); })); //退出 QObject::connect(process, SIGNAL(finished(int, QProcess::ExitStatus)), this, SLOT([&](int exitCode, QProcess::ExitStatus exitStatus){ QMessageBox::information(0, QString::number(exitCode), QString::number(exitStatus)); }));

• 界面美化

• 自定义皮肤

• Qt最小化后恢复界面假死冻结

void showEvent(QShowEvent *e){ setAttribute(Qt::WA_Mapped); QWidget::showEvent(e); }

• QML加载

m_pQuickWidget = new QQuickWidget(this); m_pQuickWidget->setFixedSize(1131,586); m_pQuickWidget->setAttribute(Qt::WA_AlwaysStackOnTop); m_pQuickWidget->setClearColor(QColor(Qt::transparent)); m_pQuickWidget->setSource(QUrl(QStringLiteral("qrc:/UI/Viewer.qml"))); m_pQuickWidget->rootObject()->setWidth(1131); m_pQuickWidget->rootObject()->setHeight(586); m_pQuickWidget->move(this->width()/2.0 - m_pQuickWidget->width()/2.0,342); m_pQuickWidget->show();

• 内存SQL

QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE"); db.setDatabaseName(":memory:");

• http服务器

• 大师

• Z-order assignment is not a valid widget

用记事本打开对应的ui文件，找到为空的地方，删除即可

• 常见问题

图片访问，需编辑qrc文件，添加资源，使用：/全路径名访问。 Vs下qt/Qt setting选择项添加相应模块 QPalette::Window表示背景色，QPalette::WindowText表示前景色 qmake -tp vc，qt工程转vc工程，同理，vs下qt选项也可以转qt工程 无法打开stddef与corecrt等文件，需要安装win kits 10 sdk，配置pro目录。或者直接使用vs2017安装更新vs sdk Qml计时：console.time() console.endtime()\ Qmake执行失败，路径必须为全英文 类成员线程快速创建，头文件QtConcurrentrun，命名空间QtConcurrent::run 编码换行符错误： QTextCodec *codec = QTextCodec::codecForName("UTF-8");//情况2 QTextCodec::setCodecForTr(codec); QTextCodec::setCodecForLocale(codec); QTextCodec::setCodecForCStrings(codec); 选项/设置/文本编辑：主要是设置成UTF-8格式，再把BOM设置成都添加。 10.构造与析构函数无法解析，执行qmake

• 指示器样式

例如 ::down-arrow,::menu-indicator{} ::up-arrow:disabled,::up-arrow:off{}。

• 管理员运行

QMAKE_LFLAGS += /MANIFESTUAC:\"level=\'requireAdministrator\' uiAccess=\'false\'\" #以管理员运行 QMAKE_LFLAGS += /SUBSYSTEM:WINDOWS,\"5.01\" #VS2013 在XP运行

• 标题栏高度

style()->pixelMetric(QStyle::PM_TitleBarHeight); PM_TitleBarHeight点进去你会发现新大陆

• 获取类属性

const QMetaObject *metaobject = object->metaObject(); int count = metaobject->propertyCount(); for (int i = 0; i < count; ++i) { QMetaProperty metaproperty = metaobject->property(i); const char *name = metaproperty.name(); QVariant value = object->property(name); qDebug() << name << value; }

• 每个控件都有ID

a.setAttribute(Qt::AA_NativeWindows);可以让每个控件都拥有独立的句柄。

• 2K,4K屏支持

#if (QT_VERSION > QT_VERSION_CHECK(5,6,0)) QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling); #endif

• 线程

QThread用法：启动与退出_qthread restart-CSDN博客

http://m.codes51.com/itwd/1338157.html

QT：最简单的方法实现多线程_正在拉磨_新浪博客

Qt使用多线程的一些心得_qt emit 处理时间长-CSDN博客

QT：最简单的方法实现多线程_正在拉磨_新浪博客

• 换肤

//移除原有样式 style()->unpolish(ui->btn); //重新设置新的该控件的样式。 style()->polish(ui->btn);

• webengine模块发布

发布程序的时候带上QtWebEngineProcess.exe+translations文件夹+resources文件夹

• 启用独立控制台

运行文件附带调试输出窗口 CONFIG += console pro

• 中文编译乱码

#if _MSC_VER >= 1600 #pragma execution_character_set("utf-8") #endif Qt creator 的菜单里 编辑-Select Encoding,可以选择编码。以及工具-选项->文本编辑器->行为->文件编码里要选择UTF-8，BOM: 如果是UTF-8则自动添加。 QString::fromLocal8Bit

• 重复文件保存

QString path = "F:/down/"; QFile m_saveFile(path + strFileName); int i = 1; while (m_saveFile.exists()) { m_saveFile.setFileName(path + strFileName + QString::number(i)); ++i; } int indexPt = strFileName.lastIndexOf('.'); path.append(strFileName.mid(0, indexPt)); path.append(QString::number(i)); path.append(strFileName.mid(indexPt, strFileName.length() - indexPt)); m_saveFile.setFileName(path); if (m_saveFile.open(QIODevice::WriteOnly)) { //打开失败 m_saveFile.write(stuBytes.m_pChar, stuBytes.m_size); m_saveFile.close(); }

QT实现windows窗口内嵌_qt dialog窗口嵌入在主窗口内部-CSDN博客

QT样式美化 之 qss入门_qt tablewidget qss-CSDN博客

C++ QT实现验证码功能_qt中实现手机验证码的方法-CSDN博客

C++ 仿QT信号槽二-CSDN博客

C++ 实现QT信号槽_c++ 加qt写一个好的示波器-CSDN博客

Electron qt开发教程_qt electron混合开发-CSDN博客

创作不易，小小的支持一下吧！