• mainwindow.h

   1 #ifndef MAINWINDOW_H
   2 #define MAINWINDOW_H
   3 
   4 #include <QMainWindow>
   5 
   6 namespace Ui {
   7 class MainWindow;
   8 }
   9 
  10 class MainWindow : public QMainWindow
  11 {
  12     Q_OBJECT
  13 
  14 public:
  15     explicit MainWindow(QWidget *parent = 0);
  16     ~MainWindow();
  17 
  18
   
   private slots:
  19     void on_pushButton_clicked();
  20 
  21     void on_pushButton_2_clicked();
  22 
  23 private:
  24     Ui::MainWindow *ui;
  25 };
  26 
  27 #endif // MAINWINDOW_H

• mainwindow.cpp

   1 #include "mainwindow.h"
   2 #include "ui_mainwindow.h"
   3 #include <QDebug>
   4 
   5 MainWindow::MainWindow(QWidget *parent) :
   
   6     QMainWindow(parent),
   7     ui(new Ui::MainWindow)
   8 {
   9     ui->setupUi(this);
  10 }
  11 
  12 MainWindow::~MainWindow()
  13 {
  14     delete ui;
  15 }
  16 
  17 void MainWindow::on_pushButton_clicked()
  18 {
  19     QString qstr1;
  20     QString qstr2;
  21     qstr1 = ui->lineEdit->text();
  22     qstr2 = ui->lineEdit_2->text();
  23     QString qstr3 ;
  24    // qstr3 = qstr1 + qstr2
  25     qstr3.sprintf("%s%d%s","123",45,"abc");
  26     qDebug() << qstr3 << endl;
  27     ui->textEdit->setText(qstr3);
   
  28 }
  29 
  30 void MainWindow::on_pushButton_2_clicked()
  31 {
  32     QString qstr3=QString("%1 is %2").arg("hello").arg(123);
  33     ui->textEdit->setText(qstr3);
  34 }

2.QT字符串及一些基本操作