WinHTTP和Websocket

Question

我试图使用WinHTTP连接到服务器，不幸的是，当我试图将协议从http升级到webscoket时，API WinHttpSetOption失败了。

hSessionHandle    = WinHttpOpen(L"WebSocket sample",WINHTTP_ACCESS_TYPE_NO_PROXY,NULL,  NULL,0);
hConnectionHandle = WinHttpConnect(hSessionHandle, L"localhost",INTERNET_DEFAULT_HTTP_PORT, 0);
hRequestHandle    = WinHttpOpenRequest(hConnectionHandle,L"GET",L"/ws",NULL,NULL,NULL,  0);

// Request protocol upgrade from http to websocket.
fStatus = WinHttpSetOption(hRequestHandle,WINHTTP_OPTION_UPGRADE_TO_WEB_SOCKET,NULL,0);
if (!fStatus)
{
   dwError = GetLastError();
   goto quit;
}

fStatus返回FALSE，GetLastError返回错误代码12009，如下所示

ERROR_WINHTTP_INVALID_OPTION 12009:对WinHttpQueryOption或WinHttpSetOption的请求指定了无效的选项值。

以上代码取自微软WinHttp WebSocket演示 (https://github.com/Microsoft/Windows-classic-samples/blob/master/Samples/WinhttpWebsocket/cpp/WinhttpWebsocket.cpp)

我的系统是Windows 7，操作系统需要是Windows 8或更高版本吗？这个API有什么线索失败吗？

Answer 1

这里有一个很好的C++ WebSocket库，它在Windows7中工作，它只使用头文件，只使用boost。它附带了示例代码和文档：http://vinniefalco.github.io/

这是一个向echo服务器发送消息的完整程序。这将在Windows 7中为您工作。

#include <beast/websocket.hpp>
#include <beast/buffers_debug.hpp>
#include <boost/asio.hpp>
#include <iostream>
#include <string>

int main()
{
    // Normal boost::asio setup
    std::string const host = "echo.websocket.org";
    boost::asio::io_service ios;
    boost::asio::ip::tcp::resolver r(ios);
    boost::asio::ip::tcp::socket sock(ios);
    boost::asio::connect(sock,
        r.resolve(boost::asio::ip::tcp::resolver::query{host, "80"}));

    using namespace beast::websocket;

    // WebSocket connect and send message using beast
    stream<boost::asio::ip::tcp::socket&> ws(sock);
    ws.handshake(host, "/");
    ws.write(boost::asio::buffer("Hello, world!"));

    // Receive WebSocket message, print and close using beast
    beast::streambuf sb;
    opcode op;
    ws.read(op, sb);
    ws.close(close_code::normal);
    std::cout <<
        beast::debug::buffers_to_string(sb.data()) << "\n";
}