Qt5：一个文本框输入字符，另一个文本框输出其大写格式

#ifndef WIDGET_H

#define WIDGET_H

#include <QWidget>

#include <QLineEdit>

class Widget : public QWidget

{

Q_OBJECT

public:

Widget(QWidget *parent = 0);

~Widget();

protected slots:

void daxie();

private:

QLineEdit *textEdit,*textEdit2;

};

#endif // WIDGET_H

#include <QWidget>

#include <QLineEdit>

#include <QApplication>

#include <QVBoxLayout>

#include "widget.h"

Widget::Widget(QWidget *parent)

: QWidget(parent)

{

QVBoxLayout *windowLayout = new QVBoxLayout(this);

textEdit = new QLineEdit;

textEdit->setEnabled(true);

textEdit2 = new QLineEdit;

textEdit2->setEnabled(false);

windowLayout->addWidget(textEdit);

windowLayout->addWidget(textEdit2);

QObject:: connect(textEdit,SIGNAL(textChanged(QString)),this,SLOT(daxie()));

}

Widget::~Widget()

{

}

void Widget::daxie()

{

QString newString = textEdit->text();

textEdit2->setText(newString.toUpper());

}

#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

Widget w;

w.show();

return a.exec();

}