请继续完善使用qt libvncclient库来实现一个vnc客户端协议

接下来，我们可以使用Qt的网络模块和libvncclient库来实现一个VNC客户端协议。

首先，我们需要在Qt项目中添加libvncclient库。在.pro文件中添加以下内容：

LIBS += -lvncclient

接下来，我们需要创建一个VNC客户端类，并在其中实现连接远程VNC服务器、发送鼠标和键盘事件等方法。

#include <QObject>
#include <QImage>
#include <QSize>
#include <QPoint>
#include <rfb/rfbclient.h>

class VncClient : public QObject
{
    Q_OBJECT
public:
    explicit VncClient(QObject *parent = nullptr);
    ~VncClient();

    void connectToServer(QString address, QString password);
    void disconnectFromServer();
    void sendMouseEvent(QPoint pos, Qt::MouseButton button, bool press);
    void sendKeyEvent(int key, bool press);

signals:
    void connected();
    void disconnected();
    void authenticationFailed();
    void authenticationSucceeded();
    void updateScreen(QImage image, QSize size);

private:
    rfbClient* m_client;
    QImage m_image;
    QSize m_size;

    static void updateScreenCallback(rfbClient* client, int x, int y, int w, int h);
};

在VncClient类中，我们使用rfbClient结构体来连接远程VNC服务器。rfbClient是libvncclient库中的结构体，用于存储VNC客户端的状态信息。

m_client = rfbGetClient(8, 3, 4);
m_client->serverHost = strdup(address.toUtf8().data());
m_client->passwd = strdup(password.toUtf8().data());
m_client->MallocFrameBuffer = nullptr;
m_client->serverPort = 5900;
m_client->listenPort = 0;
m_client->shared = true;
m_client->frameBuffer = nullptr;
m_client->frameBufferDepth = 0;
m_client->frameBufferFormat = nullptr;

rfbSetLogDest(RFB_LOG_NONE);
rfbInitClient(m_client, nullptr, nullptr);

在连接到服务器后，我们可以使用rfbClient结构体中的回调函数来处理VNC服务器发送的屏幕更新数据。在updateScreenCallback()回调函数中，我们使用QImage对象来存储屏幕上的像素数据，并通过信号发送给主线程。

void VncClient::updateScreenCallback(rfbClient* client, int x, int y, int w, int h)
{
    auto self = reinterpret_cast<VncClient*>(client->clientData);
    self->m_image = QImage(client->frameBuffer + y * client->width * (client->format.bitsPerPixel / 8),
                           w, h, QImage::Format_RGB32);
    self->m_size = QSize(client->width, client->height);
    emit self->updateScreen(self->m_image, self->m_size);
}

我们还需要实现发送鼠标和键盘事件的方法。在sendMouseEvent()方法中，我们使用rfbClient结构体中的函数来模拟鼠标事件。在sendKeyEvent()方法中，我们使用rfbClient结构体中的函数来模拟键盘事件。

void VncClient::sendMouseEvent(QPoint pos, Qt::MouseButton button, bool press)
{
    int buttonMask = (button == Qt::LeftButton ? rfbButton1Mask :
                      (button == Qt::RightButton ? rfbButton3Mask : rfbButton2Mask));
    rfbClientSendPointerEvent(m_client, pos.x(), pos.y(), buttonMask, press);
}

void VncClient::sendKeyEvent(int key, bool press)
{
    rfbClientSendKeyEvent(m_client, key, press);
}

最后，在VncClient类的析构函数中，我们需要释放rfbClient结构体和其他资源。

VncClient::~VncClient()
{
    rfbClientCleanup(m_client);
    free(m_client);
    m_client = nullptr;
    free(m_image.bits());
    m_image = QImage();
}

现在我们已经实现了一个基本的VNC客户端，可以连接到远程VNC服务器并显示屏幕数据。我们可以在主窗口中创建一个QGraphicsView控件来显示屏幕数据，并通过VncClient类中的信号来更新它的内容。

void MainWindow::onUpdateScreen(QImage image, QSize size)
{
    m_scene->clear();
    auto pixmap = QPixmap::fromImage(image);
    auto item = new QGraphicsPixmapItem(pixmap);
    m_scene->addItem(item);
    m_view->setSceneRect(0, 0, size.width(), size.height());
    m_view->fitInView(item, Qt::KeepAspectRatio);
}

最后，我们可以在主窗口中添加一些按钮和文本框，以便用户输入远程VNC服务器的地址和密码，并连接到它。我们还可以在按钮的clicked()信号中调用VncClient类中的方法来发送鼠标和键盘事件。

完整的示例代码见下：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QLineEdit>
#include <QPushButton>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QKeyEvent>
#include "vncclient.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
    , m_scene(new QGraphicsScene(this))
    , m_view(new QGraphicsView(m_scene, this))
    , m_addressInput(new QLineEdit(this))
    , m_passwordInput(new QLineEdit(this))
    , m_connectButton(new QPushButton(tr("Connect"), this))
    , m_disconnectButton(new QPushButton(tr("Disconnect"), this))
    , m_client(new VncClient(this))
{
    ui->setupUi(this);

    m_view->setRenderHint(QPainter::Antialiasing);
    m_view->setRenderHint(QPainter::SmoothPixmapTransform);
    m_view->setDragMode(QGraphicsView::ScrollHandDrag);
    m_view->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
    m_view->setOptimizationFlag(QGraphicsView::DontAdjustForAntialiasing, true);
    m_view->setOptimizationFlag(QGraphicsView::DontSavePainterState, true);
    m_view->setOptimizationFlag(QGraphicsView::DontAdjustForAntialiasing, true);
    m_view->setOptimizationFlag(QGraphicsView::DontAdjustForAntialiasing, true);
    m_view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    m_view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    m_view->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

    auto inputLayout = new QHBoxLayout();
    inputLayout->addWidget(new QLabel(tr("Address:"), this));
    inputLayout->addWidget(m_addressInput);
    inputLayout->addWidget(new QLabel(tr("Password:"), this));
    inputLayout->addWidget(m_passwordInput);

    auto buttonLayout = new QHBoxLayout();
    buttonLayout->addWidget(m_connectButton);
    buttonLayout->addWidget(m_disconnectButton);

    auto mainLayout = new QVBoxLayout();
    mainLayout->addWidget(m_view);
    mainLayout->addLayout(inputLayout);
    mainLayout->addLayout(buttonLayout);

    auto centralWidget = new QWidget(this);
    centralWidget->setLayout(mainLayout);
    setCentralWidget(centralWidget);

    connect(m_connectButton, &QPushButton::clicked, this, &MainWindow::onConnectButtonClicked);
    connect(m_disconnectButton, &QPushButton::clicked, this, &MainWindow::onDisconnectButtonClicked);
    connect(m_client, &VncClient::connected, this, &MainWindow::onConnected);
    connect(m_client, &VncClient::disconnected, this, &MainWindow::onDisconnected);
    connect(m_client, &VncClient::authenticationFailed, this, &MainWindow::onAuthenticationFailed);
    connect(m_client, &VncClient::authenticationSucceeded, this, &MainWindow::onAuthenticationSucceeded);
    connect(m_client, &VncClient::updateScreen, this, &MainWindow::onUpdateScreen);

    setMinimumSize(800, 600);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::keyPressEvent(QKeyEvent *event)
{
    m_client->sendKeyEvent(event->key(), true);
}

void MainWindow::keyReleaseEvent(QKeyEvent *event)
{
    m_client->sendKeyEvent(event->key(), false);
}

void MainWindow::onConnectButtonClicked()
{
    m_client->connectToServer(m_addressInput->text(), m_passwordInput->text());
}

void MainWindow::onDisconnectButtonClicked()
{
    m_client->disconnectFromServer();
}

void MainWindow::onConnected()
{
    m_connectButton->setEnabled(false);
    m_disconnectButton->setEnabled(true);
}

void MainWindow::onDisconnected()
{
    m_connectButton->setEnabled(true);
    m_disconnectButton->setEnabled(false);
}

void MainWindow::onAuthenticationFailed()
{
    qDebug() << "Authentication failed";
}

void MainWindow::onAuthenticationSucceeded()
{
    qDebug() << "Authentication succeeded";
}

void MainWindow::onUpdateScreen(QImage image, QSize size)
{
    m_scene->clear();
    auto pixmap = QPixmap::fromImage(image);
    auto item = new QGraphicsPixmapItem(pixmap);
    m_scene->addItem(item);
    m_view->setSceneRect(0, 0, size.width(), size.height());
    m_view->fitInView(item, Qt::KeepAspectRatio);
}

这就是使用Qt和libvncclient库实现VNC客户端协议的基本步骤。通过这个例子，我们可以学习如何使用第三方C++库，并将其与Qt的其他模块结合起来实现一个完整的应用程序。