添加可复用的代码

you_can_copy.txt

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+# Qt 读写 ini
+QSettings setting(ini_path, QSettings::IniFormat);
+// 读
+int value = setting.value("R/lower").toInt(); // 无文件或者无字段不报错，值为0
+// 写
+settings.setValue("General/Age", 30);
+
+# Qt 获取当前 exe 路径
+QString exe_path = QCoreApplication::applicationDirPath();
+QDir dir(exe_path);
+QString ini_path = dir.absoluteFilePath("ImageProcess.ini");
+
+# Qt 选择文件夹
+QFileDialog::getExistingDirectory(parent, u8"选择文件夹", QDir::homePath());
+
+# Qt 确认对话框
+QMessageBox questionBox(parent);
+questionBox.setText(content);
+questionBox.setWindowTitle(title);
+questionBox.setIcon(QMessageBox::Question);
+questionBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+int result = questionBox.exec();
+if (result != QMessageBox::Yes) {
+	return false;
+} else {
+	return true;
+}
+
+# Qt 消息提示
+QMessageBox::information(parent, u8"提示", infomation);
+
+# windows 获取CPU逻辑处理器数量
+SYSTEM_INFO sysInfo;
+GetSystemInfo(&sysInfo);
+int numCores = sysInfo.dwNumberOfProcessors;
+
+# Qt QImage 和 opencv 的转换
+cv::Mat image_ = cv::imread(path);
+cv::cvtColor(image_, image_, cv::COLOR_BGR2RGB);
+QImage(image_.data, image_.cols, image_.rows, image_.step, QImage::Format_RGB888);
+
+# Qt 遍历文件
+QStringList files = dir.entryList(QDir::Files);
+
+# Qt 读写 txt
+QFile file(list_file);
+if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+	message(this, u8"打开文件" + list_file + u8"失败");
+	return;
+}
+QTextStream in(&file);
+QString tmp;
+while (!in.atEnd()) {
+	in >> tmp;
+}
+file.close();
+
+# opencv 调节亮度
+image_.convertTo(image_, -1, 1, light);
+
+# C++ 统计运行时间
+auto start = std::chrono::high_resolution_clock::now();
+auto end = std::chrono::high_resolution_clock::now();
+auto duration = std::chrono::duration_cast<std::chrono::seconds>(end - start);
+int time = duration.count();
+
+# opencv 更改 RGB 值
+std::vector<cv::Mat> channels;
+cv::split(img, channels);
+channels[0] += r;
+channels[1] += g;
+channels[2] += b;
+cv::merge(channels, img);
+
+# Qt 限制 QLineEdit 输入整数
+QIntValidator* valid = new QIntValidator(this);
+valid->setRange(1, INT_MAX);
+ui.edPicNo->setValidator(valid);
+
+# Qt 窗口变化事件
+bool MainWidget::event(QEvent * ev)
+{
+	if (ev->type() == QEvent::Resize) {
+		
+	}
+	return QWidget::event(ev);
+}
+
+# Qt QLabel 显示图片
+QImage img = img.scaled(w, h, Qt::KeepAspectRatio);
+ui.label->setPixmap(QPixmap::fromImage(img));
+ui.label->show();