C++qtDay10

1.制作闹钟

头文件

#include <QWidget> #include <QTimerEvent> #include <QTime> #include <QtTextToSpeech/QTextToSpeech> #include <QTextEdit> #include <QString> QT_BEGIN_NAMESPACE namespace Ui { class Widget; } QT_END_NAMESPACE class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = nullptr); ~Widget(); void timerEvent(QTimerEvent *e) override; //定时器事件处理函数 private slots: void on_startBtn_clicked(); void on_stopBtn_clicked(); private: Ui::Widget *ui; QTextToSpeech *speecher; int timer_id; }; #endif // WIDGET_H

源函数

#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); speecher = new QTextToSpeech(this); } Widget::~Widget() { delete ui; } //开始按钮对应的槽函数 void Widget::on_startBtn_clicked() { timer_id = this->startTimer(1000); } //停止按钮 void Widget::on_stopBtn_clicked() { //this->killTimer(timer_id); speecher->stop(); ui->lineEdit->clear(); } void Widget::timerEvent(QTimerEvent *e) { if(e->timerId() == timer_id) { QTime sys_t = QTime::currentTime(); //获取系统时间 QString t = sys_t.toString("hh:mm:ss"); //将QTime类对象转换为字符串 ui->nowtimeLeb->setText(t); //展示到ui界面 if(t == ui->lineEdit->text()) { speecher->say(ui->textEdit->toPlainText()); } } }

主函数

#include "widget.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); Widget w; w.show(); return a.exec(); }

2.保存文件

头文件

#ifndef WIDGET_H #define WIDGET_H #include <QWidget> #include <QFileDialog> #include <QFile> #include <QMessageBox> QT_BEGIN_NAMESPACE namespace Ui { class Widget; } QT_END_NAMESPACE class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = nullptr); ~Widget(); private slots: void on_pushButton_clicked(); private: Ui::Widget *ui; }; #endif // WIDGET_H

源文件

#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); } Widget::~Widget() { delete ui; } void Widget::on_pushButton_clicked() { QString fileName = QFileDialog::getSaveFileName(this, "保存文件", "./", "Text file(*.txt)"); if(fileName.isNull()) { QMessageBox::information(this, "提示", "用户取消了保存文件"); return ; } QFile file(fileName); if(!file.isOpen()) { if(!file.open(QFile::ReadWrite)) { QMessageBox::critical(this, "失败", "文件打开失败"); return; } } QString msg = ui->textEdit->toPlainText(); file.write(msg.toUtf8()); file.close(); }

主函数

#include "widget.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); Widget w; w.show(); return a.exec(); }