QT-在Qt Widgets Application中怎么显示printf的输出内容？

相关资料：

https://blog.csdn.net/bladeandmaster88/article/details/54748192

问题：

我们在新建一个“Qt Console Application”时使用printf输出字符是可以显在出来的，但是我们在新建一个"Qt Widgets Appliation"时因为没有了命令输出框，所以看不到输出，怎么才能显示出来命令输出框？

问题处理：

在pro文件中增加“CONFIG += console”，代码如下：

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11
CONFIG += console

# 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 6.0.0

SOURCES += 
    main.cpp 
    mainwindow.cpp

HEADERS += 
    mainwindow.h

FORMS += 
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

然后打开“Rin in terminal”，操作如图：