First, set up OpenCV building environments
INCLUDEPATH += C:\OpenCV\OpenCV4.2.0DNN\include
LIBS += -LC:\OpenCV\OpenCV4.2.0DNN\lib \
-lopencv_world420
- 4月 23 週四 202011:55
How to register OpenCV Mat data type in the communication between Qt signal and slot
First, set up OpenCV building environments
- 4月 22 週三 202016:40
How to hide and remove the boarder of a QTabWidget
You can get all tabBars contained in a tabWidget by using findChild, which is a method of QTabWidget.After that, you can hide them at once.
QTabBar *tabBar = ui->tabWidget->findChild<QTabBar *>();
tabBar->hide();
- 4月 22 週三 202015:48
How to run a function in a separate thread in Qt Window App
mainwindow.h
#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QtConcurrent/QtConcurrentRun>QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{Q_OBJECT
public:MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots: void on_pushButton_start_clicked(); void on_pushButton_stop_clicked();private:Ui::MainWindow *ui;
int counter; bool running;private: void addCounter();};
#endif // MAINWINDOW_H- 4月 22 週三 202014:50
How to Load a image in a Qt Window Application
- 4月 21 週二 202021:44
How to add QTabWidget dynamically
Change tabPosition
Change tabShape
- 4月 13 週一 202008:21
How to create a thread in Qt Application
Unfortunately Qt creator in linux does not support BGR888 format, so we have to convert the image to RGB format by using cvtColor funtion before displaying it.
Mat img = imread("lena.jpg");cvtColor(img, img, COLOR_BGR2RGB);
auto w = ui->label->width();auto h = ui->label->height();ui->label->setPixmap(
QPixmap::fromImage(
QImage(img.data, img.cols, img.rows, img.step, QImage::Format_RGB888)
).scaled(w, h, Qt::KeepAspectRatio)
);
- 4月 04 週六 202020:20
Creating a Qt Console Application with OpenCV4.2.0 in Jetson Nano
INCLUDEPATH += /usr/local/include/opencv4/
LIBS+= -L/usr/local/lib/ \
`pkg-config --cflags --libs opencv4`
- 4月 04 週六 202007:42
QMessageBox Example
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>#include <QTime>#include <QDebug>MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow){ ui->setupUi(this);}
MainWindow::~MainWindow()
{ delete ui;}
void MainWindow::on_pushButton_clicked(){QMessageBox::about(this, "About", "This is an about dialog");
}
void MainWindow::on_pushButton_2_clicked(){QMessageBox::aboutQt(this, "Something about QT");
}
void MainWindow::on_pushButton_3_clicked(){QMessageBox::critical(this,"Error occured","You should check out what happened!");
}
void MainWindow::on_pushButton_4_clicked(){QTime dt_now = QTime::currentTime();
QMessageBox::information(this, "Current Time: ", dt_now.toString());
}
void MainWindow::on_pushButton_5_clicked(){QMessageBox::StandardButton reply = QMessageBox::question(this, "Login","Are you ready to go?",
QMessageBox::Yes | QMessageBox::No);
if(reply == QMessageBox::Yes) {QMessageBox::information(this, "Yes", "You've selected 'Yes' button");
qDebug() << "Yes is clicked" << endl;}else if(reply == QMessageBox::No)
{QMessageBox::information(this, "No", "You've selected 'No' button");
qDebug() << "No is clicked" << endl;}
}
void MainWindow::on_pushButton_6_clicked(){QMessageBox::warning(this, "Warning","Some warning messages have occured!");
}
- 4月 04 週六 202007:34
Installing Git for Windows v2.26.0
Downloading Git for Windows
