Question

我正在尝试启动一个cpp代码，该代码使用boost库连接到Web服务器（echo.websocket.org）。我已经成功编译了0错误和0警告的代码。

//
// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See 
accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//

//------------------------------------------------------------------------ 
//
// Example: WebSocket client, synchronous
//
//------------------------------------------------------------------------        
//[example_websocket_client

#include <boost/beast/core.hpp>
#include <boost/beast/websocket.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <cstdlib>
#include <iostream>
#include <string>

namespace beast = boost::beast;         // from <boost/beast.hpp>
namespace http = beast::http;           // from <boost/beast/http.hpp>
namespace websocket = beast::websocket; // from 
<boost/beast/websocket.hpp>
namespace net = boost::asio;            // from <boost/asio.hpp>
using tcp = boost::asio::ip::tcp;       // from <boost/asio/ip/tcp.hpp>
using namespace std;

// Sends a WebSocket message and prints the response
int main(int argc, char** argv)
{
    cout <<"Reached "<< endl;
    std::cout <<"Reached "<< argv[1] << std::endl;
    std::cout <<"Reached "<< argv[2] << std::endl;
    std::cout <<"Reached "<< argv[3] << std::endl;

 try
{
    // Check command line arguments.
    if(argc != 4)
    {
        std::cerr <<
            "Usage: websocket-client-sync <host> <port> <text>\n" <<
            "Example:\n" <<
            "    websocket-client-sync echo.websocket.org 80 \"Hello, world!\"\n";
        return EXIT_FAILURE;
    }
    auto const host = argv[1];
    auto const port = argv[2];
    auto const text = argv[3];

    // The io_context is required for all I/O
    net::io_context ioc;

    // These objects perform our I/O
    tcp::resolver resolver{ioc};
    websocket::stream<tcp::socket> ws{ioc};

    // Look up the domain name
    auto const results = resolver.resolve(host, port);

    // Make the connection on the IP address we get from a lookup
    net::connect(ws.next_layer(), results.begin(), results.end());

    // Perform the websocket handshake
    ws.handshake(host, "/");

    // Send the message
    ws.write(net::buffer(std::string(text)));

    // This buffer will hold the incoming message
    beast::multi_buffer buffer;

    // Read a message into our buffer
    ws.read(buffer);

    // Close the WebSocket connection
    ws.close(websocket::close_code::normal);

    // If we get here then the connection is closed gracefully

    // The buffers() function helps print a ConstBufferSequence
    std::cout << beast::buffers(buffer.data()) << std::endl;
}
catch(std::exception const& e)
{
    std::cerr << "Error: " << e.what() << std::endl;
    return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}

我在主体的第一行添加了提示，但是即使那些没有在控制台上打印出来。我尝试排除它们，但结果仍然相同。我不确定（退出值：-1）是什么意思，以及如何前进？

构建成功后控制台输出：

19:03:28 ****项目BoostWebSocket的配置调试的增量构建****   全部制作   构建文件：../ src / BoostWebSocket.cpp   调用：GCC C ++编译器   g ++ -I / usr / local / lib / include -O0 -g3 -c -fmessage-length = 0 -std = c ++ 0x -fPIC -pthread -MMD -MP -MF“ src / BoostWebSocket.d” -MT“ src / BoostWebSocket.d“ -o” src / BoostWebSocket.o“” ../src/BoostWebSocket.cpp“   完成的建筑物：../ src / BoostWebSocket.cpp   建立目标：BoostWebSocket   调用：GCC C ++链接器   g ++ -L / usr / lib -shared -Wl，-soname = libboost_system -pthread -o“ BoostWebSocket” ./src/BoostWebSocket.o
  完成的构建目标：BoostWebSocket 19:03:34构建完成。 0错误，0警告。（耗时5s.963ms）

按RUN后的控制台输出为空白 (image attached)

Answer 1

解决方案在于链接

我必须将-soname=libboost_system更改为-lboost_system

使用Boost库的C ++代码以退出值-1终止（这是什么意思？）

1 个答案: