c++ - boost buffer_sequence_adapter 中的奇怪编译错误

Question

我正在编写代码以使用串行连接连接到仪器并发送一些命令。到目前为止，这是我的代码:

#include <boost/asio/basic_serial_port.hpp>
#include <iostream>
#include <iterator>
#include <algorithm>


#define PORT "COM3"
#define BAUD 9600
#define DATABITS 8
#define PARITY none
#define STOP_BITS one
#define FLOW_CONTROL none

int main()
{
    using namespace boost;

    //Create the serial connection to the scope
    asio::io_service io;
    asio::basic_serial_port<asio::serial_port_service> scope(io);

    //Open the connection and configure it
    scope.open(PORT);
    scope.set_option(asio::serial_port_base::baud_rate(BAUD));
    scope.set_option(asio::serial_port_base::flow_control(asio::serial_port_base::flow_control::FLOW_CONTROL));
    scope.set_option(asio::serial_port_base::parity(asio::serial_port_base::parity::PARITY));
    scope.set_option(asio::serial_port_base::stop_bits(asio::serial_port_base::stop_bits::STOP_BITS));
    scope.set_option(asio::serial_port_base::character_size(DATABITS));

    //Open the connection

    //Send some test commands
    scope.write_some("MOVE X Y \n");

    //Close the port
    scope.close();

    return 0;
}

它在 visual studio 中看起来不错，但在编译时给我 16 个错误，所有错误都在 boost 的 buffer_sequence_adapter.hpp 的 first 部分。库代码当然看起来不错，所以我不确定为什么它不能编译。部分错误如下:

Error   1   error C2825: 'Buffers': must be a class or namespace when followed by '::'  c:\program files\boost_1_55_0\boost\asio\detail\buffer_sequence_adapter.hpp 156 1   ConsoleApplication1
Error   2   error C2039: 'const_iterator' : is not a member of '`global namespace'' c:\program files\boost_1_55_0\boost\asio\detail\buffer_sequence_adapter.hpp 156 1   ConsoleApplication1
Error   3   error C2146: syntax error : missing ';' before identifier 'iter'    c:\program files\boost_1_55_0\boost\asio\detail\buffer_sequence_adapter.hpp 156 1   ConsoleApplication1
Error   4   error C2734: 'const_iterator' : const object must be initialized if not extern  c:\program files\boost_1_55_0\boost\asio\detail\buffer_sequence_adapter.hpp 156 1   ConsoleApplication1
Error   5   error C2065: 'iter' : undeclared identifier c:\program files\boost_1_55_0\boost\asio\detail\buffer_sequence_adapter.hpp 156 1   ConsoleApplication1
Error   6   error C2228: left of '.begin' must have class/struct/union  c:\program files\boost_1_55_0\boost\asio\detail\buffer_sequence_adapter.hpp 156 1   ConsoleApplication1
Error   7   error C2825: 'Buffers': must be a class or namespace when followed by '::'  c:\program files\boost_1_55_0\boost\asio\detail\buffer_sequence_adapter.hpp 157 1   ConsoleApplication1
Error   8   error C2039: 'const_iterator' : is not a member of '`global namespace'' c:\program files\boost_1_55_0\boost\asio\detail\buffer_sequence_adapter.hpp 157 1   ConsoleApplication1

感谢任何帮助!

Answer 1

你只需要包装文字来告诉 Asio 你想如何解释缓冲区，例如

scope.write_some(boost::asio::buffer("MOVE X Y \n"));

注意，以这种方式，缓冲区也包含尾随的 NUL 字符。如果你想避免这种情况，你可以

const char* message = "MOVE X Y \n";
scope.write_some(boost::asio::buffer(message, strlen(message)));

---

背景:“它在 VS 中看起来没问题”的原因(您可能是指 Intellisense 在编译前没有诊断错误)是因为(至少有几个重载)write_some 是函数模板，而 Intellisense 实际上并不尝试为特定参数实例化模板。