QT 扫描附近WiFi 打印ssid和信号强度

以下是在QT中扫描附近WiFi并打印SSID和信号强度的示例代码：

#include <QCoreApplication>
#include <QList>
#include <QNetworkInterface>
#include <QDebug>

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

    QList<QNetworkInterface> interfaces = QNetworkInterface::allInterfaces();
    foreach (QNetworkInterface interface, interfaces)
    {
        QList<QNetworkAddressEntry> entries = interface.addressEntries();
        foreach (QNetworkAddressEntry entry, entries)
        {
            if (entry.ip().protocol() == QAbstractSocket::IPv4Protocol)
            {
                QNetworkInterface::InterfaceFlags flags = interface.flags();
                if (flags.testFlag(QNetworkInterface::IsUp) && !flags.testFlag(QNetworkInterface::IsLoopBack))
                {
                    QList<QNetworkConfiguration> configs = QNetworkConfiguration::allConfigurations();
                    foreach (QNetworkConfiguration config, configs)
                    {
                        if (config.bearerType() == QNetworkConfiguration::BearerWLAN)
                        {
                            QNetworkSession session(config);
                            QList<QNetworkConfiguration> activeConfigs = session.configuration().childConfigurations();
                            foreach (QNetworkConfiguration activeConfig, activeConfigs)
                            {
                                if (activeConfig.name() == interface.name())
                                {
                                    QProcess process;
                                    QString command = "iwlist " + interface.name() + " scanning";
                                    process.start(command);
                                    process.waitForFinished();
                                    QString output = process.readAllStandardOutput();
                                    QStringList lines = output.split("\n");
                                    foreach (QString line, lines)
                                    {
                                        line = line.trimmed();
                                        if (line.startsWith("ESSID:"))
                                        {
                                            QString ssid = line.mid(7, line.length() - 8);
                                            qDebug() << "SSID: " << ssid;
                                        }
                                        else if (line.startsWith("Signal level="))
                                        {
                                            QString signalLevel = line.mid(14, line.length() - 17);
                                            qDebug() << "Signal level: " << signalLevel;
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }

    return a.exec();
}

该代码使用了`QNetworkInterface`和`QProcess`类来扫描附近的WiFi，并打印出SSID和信号强度。需要注意的是，该代码只能在Linux系统中运行，并且需要安装`iwlist`命令行工具。在其他操作系统中，可能需要使用其他方式来扫描WiFi并获取SSID和信号强度。