86 获取主机信息

86.1 创建项目

通过QtCreator，在C:\Users\Minwei\Projects\Qt路径下，创建名为HostInfo的控制台（Console）项目，并在项目文件中添加第2行：

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

86.2 实现功能

C:\Users\Minwei\Projects\Qt\HostInfo\main.cpp：

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#include <iostream>
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using namespace std;
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#include <QCoreApplication>
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#include <QHostInfo>
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#include <QMetaEnum>
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int main(int argc, char *argv[])
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{
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    QCoreApplication a(argc, argv);
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    QString hostName = QHostInfo::localHostName();
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    cout << hostName.toStdString() << endl;
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    for (QHostAddress address : QHostInfo::fromName(hostName).addresses())
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        cout << QMetaEnum::fromType<
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            QAbstractSocket::NetworkLayerProtocol>().valueToKey(
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            address.protocol()) << ", " <<
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            address.toString().toStdString() << endl;
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    return a.exec();
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}

86.3 测试验证

运行效果如图所示：