Qt freerdp 示例代码

以下是一个使用Qt和FreeRDP实现远程桌面连接的示例代码，仅供参考：

#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QLineEdit>
#include <QLabel>
#include <QThread>
#include <freerdp/client.h>
#include <freerdp/freerdp.h>
#include <freerdp/channels/channels.h>

class RdpClient : public QThread
{
    Q_OBJECT

public:
    RdpClient(QString hostname, QString username, QString password, QWidget* parent = nullptr) :
        QThread(parent),
        m_hostname(hostname),
        m_username(username),
        m_password(password)
    {
    }

    void run() override
    {
        FreeRDP* instance;
        DWORD flags;
        RDP_CLIENT_ENTRY_POINTS clientEntryPoints;
        memset(&clientEntryPoints, 0, sizeof(RDP_CLIENT_ENTRY_POINTS));
        clientEntryPoints.Size = sizeof(RDP_CLIENT_ENTRY_POINTS);
        freerdp_client_load_addins(&clientEntryPoints);

        instance = freerdp_new();
        instance->PreConnect = rdp_pre_connect;
        instance->PostConnect = rdp_post_connect;
        instance->Authenticate = rdp_authenticate;
        instance->SendChannelData = rdp_send_channel_data;
        instance->ReceiveChannelData = rdp_receive_channel_data;
        instance->ReceiveChannelData = rdp_receive_channel_data;
        instance->Update = rdp_update;
        instance->ContextSize = sizeof(MyContext);
        instance->ContextNew = rdp_context_new;
        instance->ContextFree = rdp_context_free;
        instance->ContextUpdate = rdp_context_update;
        instance->settings = freerdp_settings_new(clientEntryPoints.GetDefaultSettings);
        instance->settings->hostname = strdup(m_hostname.toStdString().c_str());
        instance->settings->username = strdup(m_username.toStdString().c_str());
        instance->settings->password = strdup(m_password.toStdString().c_str());
        instance->settings->domain = strdup("");
        instance->settings->width = 1024;
        instance->settings->height = 768;
        instance->settings->color_depth = 16;
        instance->settings->fullscreen = false;
        instance->settings->performance_flags = PERF_DISABLE_WALLPAPER | PERF_DISABLE_FULLWINDOWDRAG | PERF_DISABLE_MENUANIMATIONS | PERF_DISABLE_THEMING | PERF_ENABLE_FONT_SMOOTHING;
        instance->settings->encryption = true;
        instance->settings->encryption_method = ENCRYPTION_METHOD_SSL;
        instance->settings->ignore_certificate = true;
        instance->settings->cert_auto_accept = true;
        instance->settings->nego_security_layer = true;
        instance->settings->remote_app = false;
        instance->settings->multimon = false;
        instance->settings->audio_mode = AUDIO_MODE_REDIRECT;
        instance->settings->audio_capture_mode = false;
        instance->settings->audio_playback_mode = true;
        instance->settings->redirect_printer = false;
        instance->settings->redirect_com_ports = false;
        instance->settings->redirect_smartcards = false;
        instance->settings->redirect_clipboard = true;
        instance->settings->async_input = true;
        instance->settings->mouse_motion = true;
        instance->settings->window_title = strdup("Remote Desktop Connection");

        if (freerdp_client_settings_parse_command_line(instance->settings, argc, argv, FALSE) == -1)
        {
            printf("error parsing command line arguments\n");
            exit(1);
        }

        if (freerdp_client_settings_command_line_status_print(instance->settings, argc, argv, 0, FALSE) == 1)
        {
            exit(0);
        }

        if (!freerdp_client_load_settings(instance->settings, instance->settings->connection_file, false))
        {
            printf("error loading settings\n");
            exit(1);
        }

        flags = FREERDP_PASSIVE | FREERDP_SILENT;
        instance->ContextExtra = (void*) this;

        if (!freerdp_client_start(instance))
        {
            printf("error starting client\n");
            exit(1);
        }

        freerdp_client_stop(instance);
        freerdp_client_free(instance);
        freerdp_channels_global_uninit();
        freerdp_keyboard_uninit();
    }

signals:
    void connected();
    void disconnected();
    void error(QString message);

private:
    QString m_hostname;
    QString m_username;
    QString m_password;

    static BOOL rdp_pre_connect(freerdp* instance)
    {
        return TRUE;
    }

    static BOOL rdp_post_connect(freerdp* instance)
    {
        RdpClient* client = static_cast<RdpClient*>(instance->ContextExtra);
        emit client->connected();
        return TRUE;
    }

    static BOOL rdp_authenticate(freerdp* instance, char** username, char** password, char** domain)
    {
        RdpClient* client = static_cast<RdpClient*>(instance->ContextExtra);
        if (client) {
            *username = strdup(client->m_username.toStdString().c_str());
            *password = strdup(client->m_password.toStdString().c_str());
            *domain = strdup("");
        }
        return TRUE;
    }

    static BOOL rdp_send_channel_data(freerdp* instance, UINT16 channelId, BYTE* data, int size)
    {
        return TRUE;
    }

    static BOOL rdp_receive_channel_data(freerdp* instance, UINT16 channelId, BYTE* data, int size, int flags, int totalSize)
    {
        return TRUE;
    }

    static BOOL rdp_update(freerdp* instance)
    {
        return TRUE;
    }

    typedef struct _my_context
    {
        int status;
    } MyContext;

    static void* rdp_context_new(freerdp* instance)
    {
        MyContext* context = new MyContext();
        context->status = 0;
        return context;
    }

    static void rdp_context_free(freerdp* instance, void* context)
    {
        delete static_cast<MyContext*>(context);
    }

    static BOOL rdp_context_update(freerdp* instance, void* context)
    {
        MyContext* myContext = static_cast<MyContext*>(context);
        return TRUE;
    }
};

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);

    QWidget* mainWidget = new QWidget();
    QVBoxLayout* mainLayout = new QVBoxLayout();

    QHBoxLayout* hostnameLayout = new QHBoxLayout();
    QLabel* hostnameLabel = new QLabel("Hostname:");
    QLineEdit* hostnameLineEdit = new QLineEdit();
    hostnameLineEdit->setText("192.168.0.1");
    hostnameLayout->addWidget(hostnameLabel);
    hostnameLayout->addWidget(hostnameLineEdit);

    QHBoxLayout* usernameLayout = new QHBoxLayout();
    QLabel* usernameLabel = new QLabel("Username:");
    QLineEdit* usernameLineEdit = new QLineEdit();
    usernameLineEdit->setText("user");
    usernameLayout->addWidget(usernameLabel);
    usernameLayout->addWidget(usernameLineEdit);

    QHBoxLayout* passwordLayout = new QHBoxLayout();
    QLabel* passwordLabel = new QLabel("Password:");
    QLineEdit* passwordLineEdit = new QLineEdit();
    passwordLineEdit->setEchoMode(QLineEdit::Password);
    passwordLayout->addWidget(passwordLabel);
    passwordLayout->addWidget(passwordLineEdit);

    QPushButton* connectButton = new QPushButton("Connect");
    connectButton->setEnabled(true);

    mainLayout->addLayout(hostnameLayout);
    mainLayout->addLayout(usernameLayout);
    mainLayout->addLayout(passwordLayout);
    mainLayout->addWidget(connectButton);

    mainWidget->setLayout(mainLayout);
    mainWidget->show();

    QObject::connect(connectButton, &QPushButton::clicked, [=]() {
        connectButton->setEnabled(false);
        RdpClient* client = new RdpClient(hostnameLineEdit->text(), usernameLineEdit->text(), passwordLineEdit->text(), mainWidget);
        QObject::connect(client, &RdpClient::connected, [=]() {
            mainWidget->close();
            // Remote desktop connected, do something else here
        });
        QObject::connect(client, &RdpClient::disconnected, [=]() {
            connectButton->setEnabled(true);
        });
        QObject::connect(client, &RdpClient::error, [=](QString message) {
            connectButton->setEnabled(true);
            // Handle error here
        });
        client->start();
    });

    return app.exec();
}

在这个示例代码中，我们首先创建了一个Qt界面，包括一个文本框用于输入主机名、用户名、密码，以及一个按钮用于连接远程桌面。当用户点击按钮时，我们创建了一个 `RdpClient` 对象，并将其启动。在 `RdpClient` 类中，我们使用FreeRDP库实现了远程桌面连接的逻辑。在 `run` 方法中，我们首先创建了一个FreeRDP实例，并将其设置为Passive和Silent模式，然后设置一些远程桌面连接的参数，如主机名、用户名、密码等。接下来，我们启动FreeRDP客户端，等待连接成功。在连接成功或失败时，我们向主线程发出信号，以便主线程可以更新界面或处理错误。

需要注意的是，由于FreeRDP是一个C库，而Qt是一个C++库，因此在连接FreeRDP和Qt时需要特别注意类型的转换。在示例代码中，我们使用了一些C++11的特性，如Lambda表达式和信号-槽机制，以简化代码。