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中看起来很好但是在编译时给出了16个错误,所有这些都在boost的buffer_sequence_adapter.hpp中first.库代码当然看起来很好,所以我不确定为什么它不会编译.一些错误如下:

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

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Answer 1

你只需要包装文字来告诉Asio你想要如何解释缓冲区,例如

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

注意,以这种方式,缓冲区也包括尾随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:"在VS中看起来没问题"的原因(你可能意味着Intellisense在编译之前没有诊断出错误)是因为(至少有几个重载)write_some是函数模板,而Intellisense实际上并没有尝试实例化特定参数的模板.