QtCreator 用纯代码编写应用程序与命令行编译

添加空程序
添加C++ source file: main.cpp
#include <QApplication>
#include <QDialog>
#include <QLabel>
int main(int argc, char** argv) {
    QApplication app(argc,argv);
    QDialog w;
    QLabel lbl(&w);
    lbl.setText("hello,你好！");
    w.show();
    return app.exec();
}
需要界面的QT程序都必须要在，*.pro文件里面加下面的语句
QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
避免中文出现乱码
#include <QApplication>
#include <QDialog>
#include <QLabel>
#include <QTextCodec>
int main(int argc, char** argv) {
    QApplication app(argc,argv);
    QTextCodec::setCodecForLocale(QTextCodec::codecForLocale());
    QDialog w;
    QLabel lbl(&w);
    lbl.setText(QObject::tr("你好！"));
    w.show();
    return app.exec();
}

qmake -project
qmake
make