ssd4答案 qt版

西工大的学弟学妹们，加油吧，QT版全部答案，仅供参考 #include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); ui->lineEdit->setFocus(); } Widget::~Widget() { delete ui; } void Widget::loadTextFile(QString i){ QString st1,st2; st1 = ":/res/"; st2 = i + ".txt"; st1 += st2; QFile inputFile(st1); inputFile.open(QIODevice::ReadOnly); QTextStream in(&inputFile); QString line = in.readAll(); inputFile.close(); ui->textEdit->setPlainText(line); ui->lineEdit_2->setFocus(); // QTextCursor cursor = ui->textEdit->textCursor(); //cursor.movePosition(QTextCursor::Start,QTextCursor::MoveAnchor,1); } void Widget::on_pushButton_4_clicked() { QString st; st = ui->lineEdit->text(); if(st.toInt()>7||st.toInt()lineEdit->selectAll(); ui->lineEdit->setFocus(); } else loadTextFile(st); } void Widget::on_pushButton_2_clicked() { QString searchString = ui->lineEdit_2->text(); QString aimedStr = ui->textEdit->toPlainText(); if(aimedStr == "") { QMessageBox::warning(this, tr("Search String"), tr("Please select text"), QMessageBox::Ok); ui->lineEdit->selectAll(); ui->lineEdit->setFocus(); } else{ if(searchString == "") { QMessageBox::warning(this, tr("Search String"), tr("Please enter a search string"), QMessageBox::Ok); ui->lineEdit_2->setFocus(); } else{