树莓派通过扫描附近WiFi进行WiFi的自动连接的qt代码

以下是使用Qt编写的树莓派WiFi自动连接代码，代码中使用了wpa_supplicant工具实现WiFi连接：

#include <QCoreApplication>
#include <QProcess>
#include <QDebug>

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

    QProcess process;
    QString program = "sudo";
    QStringList arguments;
    arguments << "wpa_supplicant" << "-B" << "-i" << "wlan0" << "-c" << "/etc/wpa_supplicant/wpa_supplicant.conf";
    process.start(program, arguments);
    process.waitForFinished(-1);
    QString output = process.readAllStandardOutput();
    qDebug() << output;

    program = "sudo";
    arguments.clear();
    arguments << "wpa_cli" << "-i" << "wlan0" << "scan";
    process.start(program, arguments);
    process.waitForFinished(-1);
    output = process.readAllStandardOutput();
    qDebug() << output;

    program = "sudo";
    arguments.clear();
    arguments << "wpa_cli" << "-i" << "wlan0" << "scan_results";
    process.start(program, arguments);
    process.waitForFinished(-1);
    output = process.readAllStandardOutput();
    qDebug() << output;

    program = "sudo";
    arguments.clear();
    arguments << "wpa_cli" << "-i" << "wlan0" << "list_networks";
    process.start(program, arguments);
    process.waitForFinished(-1);
    output = process.readAllStandardOutput();
    qDebug() << output;

    program = "sudo";
    arguments.clear();
    arguments << "wpa_cli" << "-i" << "wlan0" << "reconfigure";
    process.start(program, arguments);
    process.waitForFinished(-1);
    output = process.readAllStandardOutput();
    qDebug() << output;

    return a.exec();
}

这段代码中，首先使用wpa_supplicant工具连接到WiFi，然后使用wpa_cli工具扫描附近的WiFi，并列出扫描结果和已连接的网络列表，最后重新配置WiFi连接。在实际使用中，可以根据扫描结果自动连接到信号最强的WiFi网络。