C++ XsByteArray::pop_back方法代码示例

/*! \brief Read data from the USB port and put it into the data buffer.
	\details This function reads up to \a maxLength bytes from the port (non-blocking) and
	puts it into the \a data buffer.
	\param maxLength The maximum amount of data read.
	\param data The buffer that will store the received data.
	\returns XRV_OK if no error occurred. It can be that no data is available and XRV_OK will be
			returned. Check data.size() for the number of bytes that were read.
*/
XsResultValue UsbInterface::readData(XsSize maxLength, XsByteArray& data)
{
	XsSize length = 0;
	data.setSize(maxLength);
	XsResultValue res = readData(maxLength, data.data(), &length);
	data.pop_back(maxLength - length);
	return res;
}

/*! \brief Read data from the serial port and put it into the data buffer.
	\details This function reads up to \a maxLength bytes from the port (non-blocking) and
	puts it into the \a data buffer.
	\param maxLength The maximum amount of data read.
	\param data The buffer that will store the received data.
	\returns XRV_OK if no error occurred. It can be that no data is available and XRV_OK will be
			returned. Check data.size() for the number of bytes that were read.
*/
XsResultValue SerialInterface::readData(XsSize maxLength, XsByteArray& data)
{
	if (!isOpen())
		return (m_lastResult = XRV_NOPORTOPEN);

#ifdef _WIN32
	DWORD length;
	data.setSize(maxLength);
	BOOL rres = ::ReadFile(m_handle, data.data(), (DWORD) maxLength, &length, NULL);
	data.pop_back(maxLength-length);
	JLTRACE(gJournal, "ReadFile result " << rres << ", length " << length);

	if (!rres)
	{
		DWORD wErr = ::GetLastError();
		JLALERT(gJournal, "ReadFile returned windows error " << wErr);
		if (wErr >= ERROR_INVALID_FUNCTION && wErr <= ERROR_INVALID_HANDLE)
			return (m_lastResult = XRV_NOFILEORPORTOPEN);
		return (m_lastResult = XRV_ERROR);
	}

	if (length == 0)
		return (m_lastResult = XRV_TIMEOUT);
#else
	fd_set fd;
	fd_set err;
	timeval timeout;
	FD_ZERO(&fd);
	FD_ZERO(&err);
	FD_SET(m_handle, &fd);
	FD_SET(m_handle, &err);

	timeout.tv_sec = m_timeout/1000;
	timeout.tv_usec = (m_timeout - (timeout.tv_sec * 1000)) * 1000;

	int res = select(FD_SETSIZE, &fd, NULL, &err, &timeout);
	if (res < 0 || FD_ISSET(m_handle, &err))
	{
		data.clear();
		return (m_lastResult = XRV_ERROR);
	} else if (res == 0) {
		data.clear();
		return (m_lastResult = XRV_TIMEOUT);
	}

	data.setSize(maxLength);
	int length = read(m_handle, (void*)data.data(), maxLength);
	data.pop_back(maxLength - length);
#endif

#ifdef LOG_RX_TX
	if (length > 0)
	{
		if (rx_log == NULL)
		{
			char fname[XS_MAX_FILENAME_LENGTH];
#ifdef _WIN32
			sprintf(fname, "rx_%03d_%d.log", (int32_t) m_port, m_baudrate);
#else
			char *devname = strrchr(m_portname, '/');
			sprintf(fname, "rx_%s_%d.log", devname + 1, XsBaud::rateToNumeric(m_baudrate));
#endif
			makeFilenameUnique(fname);
			
			rx_log = fopen(fname, "wb");
		}
		fwrite(data.data(), 1, length, rx_log);
#ifdef LOG_RX_TX_FLUSH
		fflush(rx_log);
#endif
	}
#endif

	JLTRACE(gJournal, "returned success, read " << length << " of " << maxLength << " bytes, first: " << JLHEXLOG(data[0]));
	return (m_lastResult = XRV_OK);
}

/*! \brief Read data from the serial port and put it into the data buffer.
	\details This function reads up to \a maxLength bytes from the port (non-blocking) and
	puts it into the \a data buffer.
	\param maxLength The maximum amount of data read.
	\param data The buffer that will store the received data.
	\returns XRV_OK if no error occurred. It can be that no data is available and XRV_OK will be
			returned. Check data.size() for the number of bytes that were read.
*/
XsResultValue SerialInterface::readData(XsSize maxLength, XsByteArray& data)
{
	if (!isOpen())
		return (m_lastResult = XRV_NOPORTOPEN);

#ifdef _WIN32
	DWORD length;
	data.setSize(maxLength);
	BOOL rres = ::ReadFile(m_handle, data.data(), (DWORD) maxLength, &length, NULL);
	data.pop_back(maxLength-length);
	JLTRACE(gJournal, "ReadFile result " << rres << ", length " << length);

	if (!rres)
	{
		JLALERT(gJournal, "ReadFile returned windows error " << ::GetLastError());
		return (m_lastResult = XRV_ERROR);
	}

	if (length == 0)
		return (m_lastResult = XRV_TIMEOUT);
#else
	fd_set fd;
	fd_set err;
	timeval timeout;
	FD_ZERO(&fd);
	FD_ZERO(&err);
	FD_SET(m_handle, &fd);
	FD_SET(m_handle, &err);

	timeout.tv_sec = m_timeout/1000;
	timeout.tv_usec = (m_timeout - (timeout.tv_sec * 1000)) * 1000;

	int res = select(FD_SETSIZE, &fd, NULL, &err, &timeout);
	if (res < 0 || FD_ISSET(m_handle, &err))
	{
		data.clear();
		return (m_lastResult = XRV_ERROR);
	} else if (res == 0) {
		data.clear();
		return (m_lastResult = XRV_TIMEOUT);
	}

	data.setSize(maxLength);
	int length = read(m_handle, (void*)data.data(), maxLength);
	data.pop_back(maxLength - length);
//	if (m_callbackHandler != NULL && *length > 0) {
//		XsBinary bytes;
//		bytes.setPortNumber(m_port);
//		bytes.setData(data, *length);
//#ifdef LOG_CALLBACKS
//		JLDEBUG(gJournal, "XsensDeviceAPI", "C1: onBytesReceived(%d,(%d,%d),%p)\n",(int32_t) m_onBytesReceivedInstance, (int32_t) bytes->m_size, (int32_t) bytes->m_portNr, m_onBytesReceivedParam);
//#endif
////		m_callbackHandler->onBytesReceived(bytes);
//	}
#endif

#ifdef LOG_RX_TX
	if (length > 0)
	{
		if (rx_log == NULL)
		{
			char fname[XS_MAX_FILENAME_LENGTH];
#ifdef _WIN32
			sprintf(fname, "rx_%03d_%d.log", (int32_t) m_port, m_baudrate);
#else
			char *devname = strrchr(m_portname, '/');
			sprintf(fname, "rx_%s_%d.log", devname + 1, XsBaud::rateToNumeric(m_baudrate));
#endif
			rx_log = fopen(fname, "wb");
		}
		fwrite(data.data(), 1, length, rx_log);
		fflush(rx_log);
	}
#endif

	JLTRACE(gJournal, "returned success, read " << length << " of " << maxLength << " bytes, first: " << JLHEXLOG(data[0]));
	return (m_lastResult = XRV_OK);
}

/*! \brief Read data from the serial port and put it into the data buffer.
	\details This function reads up to \a maxLength bytes from the port (non-blocking) and
	puts it into the \a data buffer.
	\param maxLength The maximum amount of data read.
	\param data The buffer that will store the received data.
	\returns XRV_OK if no error occurred. It can be that no data is available and XRV_OK will be
			returned. Check data.size() for the number of bytes that were read.
*/
XsResultValue SerialInterface::readData(XsSize maxLength, XsByteArray& data)
{
	if (!isOpen())
		return (m_lastResult = XRV_NOPORTOPEN);

#ifdef _WIN32
	DWORD length;
	data.setSize(maxLength);
	BOOL rres = ::ReadFile(m_handle, data.data(), (DWORD) maxLength, &length, NULL);
	data.pop_back(maxLength-length);
	JLTRACE(gJournal, "ReadFile result " << rres << ", length " << length);

	if (!rres)
	{
		DWORD wErr = ::GetLastError();
		JLALERT(gJournal, "ReadFile returned windows error " << wErr);
		if (wErr == ERROR_ACCESS_DENIED)
			return (m_lastResult = XRV_UNEXPECTED_DISCONNECT);
		if (wErr >= ERROR_INVALID_FUNCTION && wErr <= ERROR_INVALID_HANDLE)
			return (m_lastResult = XRV_NOFILEORPORTOPEN);
		return (m_lastResult = XRV_ERROR);
	}

	if (length == 0)
		return (m_lastResult = XRV_TIMEOUT);
#else
	fd_set fd;
	fd_set err;
	timeval timeout;
	FD_ZERO(&fd);
	FD_ZERO(&err);
	FD_SET(m_handle, &fd);
	FD_SET(m_handle, &err);

	timeout.tv_sec = m_timeout/1000;
	timeout.tv_usec = (m_timeout - (timeout.tv_sec * 1000)) * 1000;

	int res = select(FD_SETSIZE, &fd, NULL, &err, &timeout);
	if (res < 0 || FD_ISSET(m_handle, &err))
	{
		data.clear();
		return (m_lastResult = XRV_ERROR);
	} else if (res == 0) {
		data.clear();
		return (m_lastResult = XRV_TIMEOUT);
	}

	data.setSize(maxLength);
	int length = read(m_handle, (void*)data.data(), maxLength);
	if (length > 0)
	{
		data.pop_back(maxLength - length);
	}
	else
	{
		int err = errno;

		data.clear();
		switch (err)
		{
		case EAGAIN:
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
		case EWOULDBLOCK:
#endif
			return XRV_TIMEOUT;

		case EIO:
			return XRV_UNEXPECTED_DISCONNECT;

		default:
			break;
		}
	}
#if defined(JLLOGLEVEL) && JLLOGLEVEL <= JLL_TRACE && !defined(ANDROID)
	serial_icounter_struct ic;
	res = ioctl(m_handle, TIOCGICOUNT, &ic);
	if (res == 0)
	{
		JLTRACE(gJournal, "rx: " << ic.rx);
		JLTRACE(gJournal, "tx: " << ic.tx);
		JLTRACE(gJournal, "frame " << ic.frame);
		JLTRACE(gJournal, "overrun " << ic.overrun);
		JLTRACE(gJournal, "buf_overrun " << ic.buf_overrun);
	}
#endif
#endif

#ifdef LOG_RX_TX
	if (length > 0)
	{
		if (!rx_log.isOpen())
		{
//.........这里部分代码省略.........