用QT 写一个无线网络管理的例子，功能有：扫描热点，选择热点后用户填写密码后连接此热点，且扫描与连接过程中，不影响用户的其它操作，系统中已提供wpa_supplicant 和wpa_cli

这是一个基本的框架，你可以根据自己的需求进行修改和完善。注意，这只是一个示例，可能会有一些错误或不完善的地方，请谨慎使用。

首先，需要引入以下头文件：

#include <QMainWindow>
#include <QListWidget>
#include <QLineEdit>
#include <QPushButton>
#include <QProcess>

然后，在主界面中添加以下控件：

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    void setupUi();

    QListWidget *m_listWidget;
    QLineEdit *m_passwordLineEdit;
    QPushButton *m_scanButton;
    QPushButton *m_connectButton;

    QProcess *m_scanProcess;
    QProcess *m_connectProcess;
};

在 `setupUi()` 函数中初始化控件：

void MainWindow::setupUi()
{
    m_listWidget = new QListWidget(this);
    m_passwordLineEdit = new QLineEdit(this);
    m_scanButton = new QPushButton("Scan", this);
    m_connectButton = new QPushButton("Connect", this);

    QVBoxLayout *vLayout = new QVBoxLayout;
    vLayout->addWidget(m_listWidget);
    vLayout->addWidget(m_passwordLineEdit);
    vLayout->addWidget(m_scanButton);
    vLayout->addWidget(m_connectButton);

    QWidget *centralWidget = new QWidget;
    centralWidget->setLayout(vLayout);
    setCentralWidget(centralWidget);

    connect(m_scanButton, &QPushButton::clicked, this, &MainWindow::scanWifi);
    connect(m_connectButton, &QPushButton::clicked, this, &MainWindow::connectWifi);

    m_scanProcess = new QProcess(this);
    m_connectProcess = new QProcess(this);

    connect(m_scanProcess, &QProcess::readyReadStandardOutput, this, &MainWindow::updateWifiList);
    connect(m_connectProcess, &QProcess::readyReadStandardOutput, this, &MainWindow::showConnectResult);
}

然后，实现扫描热点的函数：

void MainWindow::scanWifi()
{
    m_listWidget->clear();

    QStringList args;
    args << "-i" << "wlan0" << "scan";

    m_scanProcess->start("sudo", args);
}

在扫描完成后，需要更新热点列表：

void MainWindow::updateWifiList()
{
    QString output = m_scanProcess->readAllStandardOutput();

    QStringList lines = output.split("\n");

    foreach (QString line, lines) {
        if (line.startsWith("ssid=")) {
            QString ssid = line.mid(5);
            m_listWidget->addItem(ssid);
        }
    }
}

选择热点后，用户需要填写密码，然后连接：

void MainWindow::connectWifi()
{
    QString ssid = m_listWidget->currentItem()->text();
    QString password = m_passwordLineEdit->text();

    QStringList args;
    args << "-i" << "wlan0" << "add_network";
    m_connectProcess->start("sudo", args);
    m_connectProcess->waitForFinished();

    QByteArray output = m_connectProcess->readAllStandardOutput();
    int networkId = output.toInt();

    args.clear();
    args << "-i" << "wlan0" << "set_network" << QString::number(networkId) << "ssid" << "\"" + ssid + "\"";
    m_connectProcess->start("sudo", args);
    m_connectProcess->waitForFinished();

    args.clear();
    args << "-i" << "wlan0" << "set_network" << QString::number(networkId) << "psk" << "\"" + password + "\"";
    m_connectProcess->start("sudo", args);
    m_connectProcess->waitForFinished();

    args.clear();
    args << "-i" << "wlan0" << "enable_network" << QString::number(networkId);
    m_connectProcess->start("sudo", args);
    m_connectProcess->waitForFinished();

    args.clear();
    args << "-i" << "wlan0" << "reassociate";
    m_connectProcess->start("sudo", args);
    m_connectProcess->waitForFinished();
}

连接完成后，需要显示连接结果：

void MainWindow::showConnectResult()
{
    QString output = m_connectProcess->readAllStandardOutput();

    if (output.contains("CTRL-EVENT-CONNECTED")) {
        QMessageBox::information(this, tr("Information"), tr("Connect success."));
    } else {
        QMessageBox::warning(this, tr("Warning"), tr("Connect failed."));
    }
}

至此，一个简单的无线网络管理的例子就完成了。不过，需要注意的是，这个例子中使用了 `sudo` 命令，需要确保程序有足够的权限才能运行。