为什么 Qt Creator 看不到 QCoreApplication

Question

我刚刚安装了 Qt Creator 并创建了控制台项目。当我想运行我的项目时出现错误：未知类型名称'QCoreApplication'。但是我还没有写任何代码。哪里有问题，为什么qt看不到？ 我的代码是：

#include <QCoreApplication>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    return a.exec();
}

我的 .pro 文件是：

CONFIG += c++11 console
CONFIG -= app_bundle

# 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

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

Answer 1

@ADV 看起来你忘记包含 QCoreApplication，所以它应该是你的 main.cpp 文件的第一行：

#include <QCoreApplication>

统一更新： 您确定在 Kit Selection 阶段选择了有效的 Kit：

要检查套件，您必须转到工具->选项->套件并检查您的套件是否有效且不包含感叹号。

要更改用于当前项目的套件，请打开“项目”选项卡：

并选择不同的套件。