Qt中写一个小窗口

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打开Qt Creator，新建空的qmake项目，自定义文件名mywidget，完成后在mywidget.pro中添加“QT += widgets”。然后往项目中添加C++源文件main.cpp，并添加如下代码。#include <QtWidgets>int main(int argc, char * argv[]){    QApplication a(argc, argv);    QWidget * widget = new QWidget(0, Qt::Dialog | Qt::FramelessWindowHint);    widget->setWindowTitle(QObject::tr("I am widget"));    QLabel * label = new QLabel(0, Qt::SplashScreen | Qt::WindowStaysOnTopHint);    label->setWindowTitle(QObject::tr(" I am label"));    label->setText(QObject::tr("label:I am a window"));    label->resize(180, 20);    QLabel * label2 = new QLabel(widget);    label2->setText(QObject::tr("label2:我不是独立窗口，只是widget子部件"));    label2->resize(250, 20);    label->show();    widget->show();    int ret = a.exec();    delete label;    delete widget;    return ret;}

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