1.方法

(1)点击new project按钮，弹出对话框，新建即可，步骤如下：

(2) 点击文件菜单，选择新建文件或者工程，后续步骤如上

2.QT工程文件介绍

(1).pro文件 --》QT工程配置文件

QT       += core gui //添加要使用的QT库  core(核心库)  gui(图形用户交互库)greaterThan(QT_MAJOR_VERSION, 4): QT += widgets  //添加widgets窗口库TARGET = firstqt  //生成的可执行程序的名字
TEMPLATE = app    //生成QT应用程序SOURCES += main.cpp\mainwindow.cpp   //QT工程编译需要用到的源码HEADERS  += mainwindow.h    //QT工程编译需要的头文件FORMS    += mainwindow.ui   //QT工程中的界面文件

配置如下：

QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \mainwindow.cppHEADERS += \mainwindow.hFORMS += \mainwindow.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += targetRESOURCES += \res.qrc

(2)main.cpp --》QT工程主函数所在的源码

 int main(int argc, char *argv[])
{ QApplication a(argc, argv);  //管理整个QT程序(管理QT的信号与槽，管理QT的事件响应)MainWindow w;       //创建了一个主窗口对象，叫做ww.show();           //显示主窗口return a.exec();    //进入事件循环，不断地刷新主窗口
}