Qt实现Kermit协议(五)

3 实现

3.4 KermitFileSender

该模块实现了Kermit异步发送文件功能。

3.4.1 KermitFileSender定义

class QSerialPort;
class KermitSendFile;
class KermitFileSender : public QObject
{
    Q_OBJECT
public:
    explicit KermitFileSender(QSerialPort *serial, QObject *parent = nullptr);
    ~KermitFileSender();

signals:
    void start_send(QString const& fileName);
    void cancel_send();

    void gotFileSize(quint64 filesize);
    void progressInfo(quint32 blockNumber, quint64 bytesOfSend);
    void finished();
    void error(QString const& e);
public:
    void start(QString const& fileName);
    void stop();
    void cancel();
private:
   QThread workerThread;
   KermitSendFile* worker_;
};
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公共接口：

• start 开始发送文件
• stop 停止传输文件
• cancel 中断传输文件

信号：

• gotFileSize 文件大小信号
• progressInfo 传输进度信号
• error 出错信号
• finished 传输结束信号
• start_send 开始发送文件信号
• cancel_send 中断传输文件信号

3.4.2 KermitFileSender实现

3.4.2.1 构造函数/析构函数

KermitFileSender::KermitFileSender(QSerialPort *serial, QObject *parent)
    : QObject(parent)
{
    KermitSendFile* worker = new KermitSendFile(serial);

    serial->moveToThread(&workerThread);
    worker->moveToThread(&workerThread);

    connect(&workerThread, &QThread::finished, worker, &QObject::deleteLater);
    connect(this, &KermitFileSender::start_send, worker, &KermitSendFile::start);
    connect(this, &KermitFileSender::cancel_send, worker, &KermitSendFile::cancel);
    connect(worker, &KermitSendFile::gotFileSize, this, &KermitFileSender::gotFileSize);
    connect(worker, &KermitSendFile::progressInfo, this, &KermitFileSender::progressInfo);
    connect(worker, &KermitSendFile::finished, this, &KermitFileSender::finished);
    connect(worker, &KermitSendFile::error, this, &KermitFileSender::error);
    worker_ = worker;
    workerThread.start();
}

KermitFileSender::~KermitFileSender()
{
    workerThread.quit();
    workerThread.wait();
}
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函数说明:

• 构造函数
  • 将serial和worker移动到workerThread线程
  • 连接信号和槽函数
  • 启动线程
• 析构函数
  • 退出线程
  • 等待线程退出

3.4.2.2 start/stop/cancel

KermitFileSender::~KermitFileSender()
{
    workerThread.quit();
    workerThread.wait();
}

void KermitFileSender::start(QString const& fileName)
{
    emit start_send(fileName);
}

void KermitFileSender::stop()
{
    worker_->stop();
}

void KermitFileSender::cancel()
{
    emit cancel_send();
}
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函数说明:

• start 发送信号start_send开始文件传输
• stop 调用work函数stop停止操作
• cancel 发送信号cancel_send取消文件传输操作

Qt实现Kermit协议(四)  Qt实现Kermit协议(六)