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@ -25,173 +25,258 @@ using serial::stopbits_t;
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class Serial::ScopedReadLock {
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class Serial::ScopedReadLock {
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public:
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public:
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// 构造函数，传入串行实现类指针，并获取读锁
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ScopedReadLock(SerialImpl *pimpl) : pimpl_(pimpl) {
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ScopedReadLock(SerialImpl *pimpl) : pimpl_(pimpl) {
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this->pimpl_->readLock();
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this->pimpl_->readLock();
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}
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}
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// 析构函数，释放读锁
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~ScopedReadLock() { this->pimpl_->readUnlock(); }
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~ScopedReadLock() { this->pimpl_->readUnlock(); }
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private:
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private:
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// Disable copy constructors
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// 禁用复制构造函数
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ScopedReadLock(const ScopedReadLock &);
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ScopedReadLock(const ScopedReadLock &);
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// 禁用赋值操作符
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const ScopedReadLock &operator=(ScopedReadLock);
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const ScopedReadLock &operator=(ScopedReadLock);
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SerialImpl *pimpl_;
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SerialImpl *pimpl_;
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};
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};
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class Serial::ScopedWriteLock {
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// 这是一个私有的类定义部分，可能是一个互斥锁封装类
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public:
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class ScopedWriteLock {
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ScopedWriteLock(SerialImpl *pimpl) : pimpl_(pimpl) {
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this->pimpl_->writeLock();
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}
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~ScopedWriteLock() { this->pimpl_->writeUnlock(); }
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private:
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private:
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// 禁用拷贝构造函数，避免对象被误拷贝
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// Disable copy constructors there
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// Disable copy constructors there
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ScopedWriteLock(const ScopedWriteLock &);
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ScopedWriteLock(const ScopedWriteLock &); // 删除此函数或声明为=delete
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const ScopedWriteLock &operator=(ScopedWriteLock);
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// 禁用赋值运算符，避免对象被误赋值
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const ScopedWriteLock &operator=(ScopedWriteLock); // 缺少引用符号，应改为const ScopedWriteLock& operator=(const ScopedWriteLock&) = delete;
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// 指向实现类的指针，使用了Pimpl（Pointer to Implementation）技术
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SerialImpl *pimpl_;
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SerialImpl *pimpl_;
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};
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};
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Serial::Serial(const string &port, uint32_t baudrate, serial::Timeout timeout,
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// Serial类定义，可能是一个串口通信类
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bytesize_t bytesize, parity_t parity, stopbits_t stopbits,
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class Serial {
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flowcontrol_t flowcontrol)
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public:
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: pimpl_(new SerialImpl(port, baudrate, bytesize, parity, stopbits,
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// 构造函数，初始化串口设置
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flowcontrol)) {
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Serial(const string &port, uint32_t baudrate, serial::Timeout timeout,
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pimpl_->setTimeout(timeout);
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bytesize_t bytesize, parity_t parity, stopbits_t stopbits,
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}
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flowcontrol_t flowcontrol)
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: pimpl_(new SerialImpl(port, baudrate, bytesize, parity, stopbits,
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flowcontrol)) {
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pimpl_->setTimeout(timeout); // 设置超时时间
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}
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Serial::~Serial() { delete pimpl_; }
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// 析构函数，释放资源
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~Serial() { delete pimpl_; }
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void Serial::open() { pimpl_->open(); }
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// 打开串口
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void open() { pimpl_->open(); }
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void Serial::close() { pimpl_->close(); }
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// 关闭串口
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void close() { pimpl_->close(); }
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bool Serial::isOpen() const { return pimpl_->isOpen(); }
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// 检查串口是否打开
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bool isOpen() const { return pimpl_->isOpen(); }
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size_t Serial::available() { return pimpl_->available(); }
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// 获取串口上可用的字节数
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size_t available() { return pimpl_->available(); }
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bool Serial::waitReadable() {
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// 等待串口可读
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serial::Timeout timeout(pimpl_->getTimeout());
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bool waitReadable() {
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return pimpl_->waitReadable(timeout.read_timeout_constant);
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serial::Timeout timeout(pimpl_->getTimeout());
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}
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return pimpl_->waitReadable(timeout.read_timeout_constant);
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}
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void Serial::waitByteTimes(size_t count) { pimpl_->waitByteTimes(count); }
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// 等待特定数量的字节时间（可能是为了同步）
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void waitByteTimes(size_t count) { pimpl_->waitByteTimes(count); }
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size_t Serial::read_(uint8_t *buffer, size_t size) {
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// 从串口读取数据（无锁）
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return this->pimpl_->read(buffer, size);
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size_t read_(uint8_t *buffer, size_t size) {
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}
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return this->pimpl_->read(buffer, size);
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}
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size_t Serial::read(uint8_t *buffer, size_t size) {
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// 从串口读取数据（使用ScopedReadLock加锁）
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ScopedReadLock lock(this->pimpl_);
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size_t read(uint8_t *buffer, size_t size) {
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return this->pimpl_->read(buffer, size);
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ScopedReadLock lock(this->pimpl_); // 假设ScopedReadLock是一个读取锁类
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}
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return this->pimpl_->read(buffer, size);
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}
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private:
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// 指向实现类的指针，使用了Pimpl（Pointer to Implementation）技术
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SerialImpl *pimpl_;
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};
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size_t Serial::read(std::vector<uint8_t> &buffer, size_t size) {
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size_t Serial::read(std::vector<uint8_t> &buffer, size_t size) {
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// 创建一个读锁，保证读操作的安全性
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ScopedReadLock lock(this->pimpl_);
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ScopedReadLock lock(this->pimpl_);
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// 分配一个新的缓冲区来存储读取的数据
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uint8_t *buffer_ = new uint8_t[size];
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uint8_t *buffer_ = new uint8_t[size];
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// 初始化已读取的字节数为0
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size_t bytes_read = 0;
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size_t bytes_read = 0;
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try {
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try {
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// 尝试从串行端口读取数据到缓冲区
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bytes_read = this->pimpl_->read(buffer_, size);
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bytes_read = this->pimpl_->read(buffer_, size);
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} catch (const std::exception &e) {
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} catch (const std::exception &e) {
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// 如果读取过程中发生异常，删除缓冲区并重新抛出异常
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delete[] buffer_;
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delete[] buffer_;
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throw;
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throw;
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}
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}
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// 将读取的数据插入到传入的vector中
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buffer.insert(buffer.end(), buffer_, buffer_ + bytes_read);
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buffer.insert(buffer.end(), buffer_, buffer_ + bytes_read);
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// 删除临时缓冲区
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delete[] buffer_;
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delete[] buffer_;
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// 返回实际读取的字节数
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return bytes_read;
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return bytes_read;
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}
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}
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size_t Serial::read(std::string &buffer, size_t size) {
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size_t Serial::read(std::string &buffer, size_t size) {
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// 创建一个读锁，保证读操作的安全性
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ScopedReadLock lock(this->pimpl_);
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ScopedReadLock lock(this->pimpl_);
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// 分配一个新的缓冲区来存储读取的数据
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uint8_t *buffer_ = new uint8_t[size];
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uint8_t *buffer_ = new uint8_t[size];
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// 初始化已读取的字节数为0
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size_t bytes_read = 0;
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size_t bytes_read = 0;
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try {
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try {
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// 尝试从串行端口读取数据到缓冲区
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bytes_read = this->pimpl_->read(buffer_, size);
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bytes_read = this->pimpl_->read(buffer_, size);
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} catch (const std::exception &e) {
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} catch (const std::exception &e) {
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// 如果读取过程中发生异常，删除缓冲区并重新抛出异常
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delete[] buffer_;
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delete[] buffer_;
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throw;
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throw;
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}
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}
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// 将读取的数据追加到传入的string中
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buffer.append(reinterpret_cast<const char *>(buffer_), bytes_read);
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buffer.append(reinterpret_cast<const char *>(buffer_), bytes_read);
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// 删除临时缓冲区
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delete[] buffer_;
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delete[] buffer_;
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// 返回实际读取的字节数
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return bytes_read;
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return bytes_read;
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}
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}
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// Serial类中的成员函数，用于读取指定字节数并返回字符串
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string Serial::read(size_t size) {
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string Serial::read(size_t size) {
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std::string buffer;
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std::string buffer; // 创建一个字符串用于存储读取的数据
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this->read(buffer, size);
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buffer.resize(size); // 预分配足够的存储空间
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return buffer;
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this->read(&buffer[0], size); // 调用重载的read函数，将读取的数据填充到buffer中
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return buffer; // 返回读取到的字符串
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}
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}
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// Serial类中的成员函数，用于读取一行数据并返回字符串
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size_t Serial::readline(string &buffer, size_t size, string eol) {
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size_t Serial::readline(string &buffer, size_t size, string eol) {
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ScopedReadLock lock(this->pimpl_);
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ScopedReadLock lock(this->pimpl_); // 使用ScopedReadLock对读取操作进行加锁
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size_t eol_len = eol.length();
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size_t eol_len = eol.length(); // 获取行结束符的长度
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// 使用alloca函数在栈上动态分配足够大小的字节数组来存储读取的数据
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// 注意：alloca函数不是C++标准库的一部分，并且在某些平台上可能不被支持或存在安全问题
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// 在实践中，更推荐使用std::vector<uint8_t>或std::array<uint8_t, N>来替代
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uint8_t *buffer_ = static_cast<uint8_t *>(alloca(size * sizeof(uint8_t)));
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uint8_t *buffer_ = static_cast<uint8_t *>(alloca(size * sizeof(uint8_t)));
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size_t read_so_far = 0;
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size_t read_so_far = 0; // 记录已经读取的字节数
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while (true) {
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while (true) {
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// 尝试读取一个字节
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size_t bytes_read = this->read_(buffer_ + read_so_far, 1);
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size_t bytes_read = this->read_(buffer_ + read_so_far, 1);
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read_so_far += bytes_read;
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read_so_far += bytes_read;
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// 如果没有读取到任何数据（可能是超时），则退出循环
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if (bytes_read == 0) {
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if (bytes_read == 0) {
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break; // Timeout occured on reading 1 byte
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break; // 读取1字节时发生超时
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}
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}
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// 如果已经读取的字节数还不足以构成一个完整的行结束符，则继续读取
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if (read_so_far < eol_len)
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if (read_so_far < eol_len)
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continue;
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continue;
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// 检查当前读取到的数据是否包含行结束符
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if (string(reinterpret_cast<const char *>(buffer_ + read_so_far - eol_len),
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if (string(reinterpret_cast<const char *>(buffer_ + read_so_far - eol_len),
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eol_len) == eol) {
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eol_len) == eol) {
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break; // EOL found
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break; // 找到行结束符
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}
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}
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// 如果已经读取了最大字节数，则退出循环
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if (read_so_far == size) {
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if (read_so_far == size) {
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break; // Reached the maximum read length
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break; // 达到最大读取长度
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}
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}
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}
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}
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// 将读取到的数据转换为字符串并追加到传入的buffer中
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buffer.append(reinterpret_cast<const char *>(buffer_), read_so_far);
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buffer.append(reinterpret_cast<const char *>(buffer_), read_so_far);
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// 返回实际读取的字节数
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return read_so_far;
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return read_so_far;
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}
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}
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// Serial类中的成员函数，读取一行数据并返回字符串（使用临时字符串对象）
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string Serial::readline(size_t size, string eol) {
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string Serial::readline(size_t size, string eol) {
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std::string buffer;
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std::string buffer; // 创建一个临时字符串对象
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this->readline(buffer, size, eol);
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this->readline(buffer, size, eol); // 调用重载的readline函数
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return buffer;
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return buffer; // 返回读取到的字符串
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}
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}
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// 中文注释：
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// Serial::read函数：
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// 读取指定字节数的数据，并将数据转换为字符串返回。
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//
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// Serial::readline函数（带引用参数）：
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// 读取一行数据，直到遇到指定的行结束符或者读取了指定数量的字节或者发生超时。
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// 读取到的数据会被追加到传入的字符串buffer中，并返回实际读取的字节数。
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// 该函数使用ScopedReadLock进行加锁操作，以确保在多线程环境中线程安全。
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//
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// Serial::readline函数（返回字符串）：
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// 与带引用参数的readline函数功能相同，但返回的是一个新创建的字符串对象。
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// 内部使用了一个临时字符串对象来存储读取到的数据。
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// Serial类中的成员函数，用于从串口读取多行数据并返回一个string向量
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vector<string> Serial::readlines(size_t size, string eol) {
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vector<string> Serial::readlines(size_t size, string eol) {
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ScopedReadLock lock(this->pimpl_);
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ScopedReadLock lock(this->pimpl_); // 使用ScopedReadLock对读取操作进行加锁
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std::vector<std::string> lines;
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std::vector<std::string> lines; // 创建一个字符串向量来存储读取到的多行数据
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size_t eol_len = eol.length();
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size_t eol_len = eol.length(); // 获取行结束符的长度
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// 注意：虽然这里使用了alloca来分配内存，但在C++中更推荐使用std::vector或std::array
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// 这里为了保持与原始代码的一致性，仍然使用alloca
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uint8_t *buffer_ = static_cast<uint8_t *>(alloca(size * sizeof(uint8_t)));
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uint8_t *buffer_ = static_cast<uint8_t *>(alloca(size * sizeof(uint8_t)));
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size_t read_so_far = 0;
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size_t read_so_far = 0; // 记录已经读取的字节数
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size_t start_of_line = 0;
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size_t start_of_line = 0; // 记录当前行的起始位置
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// 循环读取数据，直到达到最大读取长度或发生超时
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while (read_so_far < size) {
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while (read_so_far < size) {
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// 尝试读取一个字节
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size_t bytes_read = this->read_(buffer_ + read_so_far, 1);
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size_t bytes_read = this->read_(buffer_ + read_so_far, 1);
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read_so_far += bytes_read;
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read_so_far += bytes_read;
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// 如果读取失败（可能是超时）
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if (bytes_read == 0) {
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if (bytes_read == 0) {
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// 如果当前行有数据（即start_of_line不等于当前位置），则添加到lines中
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if (start_of_line != read_so_far) {
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if (start_of_line != read_so_far) {
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lines.push_back(
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lines.push_back(
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string(reinterpret_cast<const char *>(buffer_ + start_of_line),
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string(reinterpret_cast<const char *>(buffer_ + start_of_line),
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read_so_far - start_of_line));
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read_so_far - start_of_line));
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}
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}
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break; // Timeout occured on reading 1 byte
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break; // 读取1字节时发生超时，退出循环
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}
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}
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// 如果当前读取的字节数还不足以构成一个完整的行结束符，则继续读取
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if (read_so_far < eol_len)
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if (read_so_far < eol_len)
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continue;
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continue;
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// 检查当前读取到的数据是否包含行结束符
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if (string(reinterpret_cast<const char *>(buffer_ + read_so_far - eol_len),
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if (string(reinterpret_cast<const char *>(buffer_ + read_so_far - eol_len),
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eol_len) == eol) {
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eol_len) == eol) {
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// EOL found
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// 发现行结束符，将当前行添加到lines中
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lines.push_back(
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lines.push_back(
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string(reinterpret_cast<const char *>(buffer_ + start_of_line),
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string(reinterpret_cast<const char *>(buffer_ + start_of_line),
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read_so_far - start_of_line));
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read_so_far - eol_len));
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// 更新当前行的起始位置为行结束符之后
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start_of_line = read_so_far;
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start_of_line = read_so_far;
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}
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}
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// 如果已经读取了最大字节数，则退出循环
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if (read_so_far == size) {
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if (read_so_far == size) {
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// 如果当前行有数据（即start_of_line不等于当前位置），则添加到lines中
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if (start_of_line != read_so_far) {
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if (start_of_line != read_so_far) {
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lines.push_back(
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lines.push_back(
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string(reinterpret_cast<const char *>(buffer_ + start_of_line),
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string(reinterpret_cast<const char *>(buffer_ + start_of_line),
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read_so_far - start_of_line));
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read_so_far - start_of_line));
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}
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}
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|
break; // Reached the maximum read length
|
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|
break; // 达到最大读取长度，退出循环
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}
|
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}
|
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}
|
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}
|
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// 返回读取到的多行数据
|
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|
return lines;
|
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|
return lines;
|
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}
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}
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