Poco websocket库特点:

  1. 使用http/https ClientSession创建websocket client
  2. 是同步的,这对C++桌面编程来说应该是够用的.
  3. 依赖openssl.
#include "stdafx.h"
#include <iostream>
#include <assert.h>

#include "Poco/Net/WebSocket.h"
#include "Poco/Net/HTTPClientSession.h"
#include "Poco/Net/HTTPRequest.h"
#include "Poco/Net/HTTPResponse.h"
#include "Poco/Net/ServerSocket.h"
#include "Poco/Net/NetException.h"
#include "Poco/Exception.h"
#include "Poco/Net/HTTPSClientSession.h"

#include "Poco/URIStreamOpener.h"
#include "Poco/StreamCopier.h"
#include "Poco/Path.h"
#include "Poco/URI.h"
#include "Poco/SharedPtr.h"
#include "Poco/Exception.h"
#include "Poco/Net/HTTPStreamFactory.h"
#include "Poco/Net/HTTPSStreamFactory.h"
#include "Poco/Net/FTPStreamFactory.h"
#include "Poco/Net/SSLManager.h"
#include "Poco/Net/KeyConsoleHandler.h"
#include "Poco/Net/ConsoleCertificateHandler.h"
#include "Poco/Net/AcceptCertificateHandler.h"
#include "Poco/Net/SecureStreamSocket.h"
#include "Poco/Net/X509Certificate.h"
#include <memory>

using Poco::Net::HTTPSClientSession;
using Poco::Net::HTTPClientSession;
using Poco::Net::HTTPRequest;
using Poco::Net::HTTPResponse;
using Poco::Net::HTTPServerRequest;
using Poco::Net::HTTPServerResponse;
using Poco::Net::WebSocket;
using Poco::Net::WebSocketException;
using Poco::Exception;

using Poco::URIStreamOpener;
using Poco::StreamCopier;
using Poco::Path;
using Poco::URI;
using Poco::SharedPtr;
using Poco::Exception;
using Poco::Net::HTTPStreamFactory;
using Poco::Net::HTTPSStreamFactory;
using Poco::Net::FTPStreamFactory;
using Poco::Net::SSLManager;
using Poco::Net::Context;
using Poco::Net::KeyConsoleHandler;
using Poco::Net::PrivateKeyPassphraseHandler;
using Poco::Net::InvalidCertificateHandler;
using Poco::Net::ConsoleCertificateHandler;
using Poco::Net::AcceptCertificateHandler;
using Poco::Net::X509Certificate;



int main(int argc, _TCHAR* argv[])
{
char buffer[1024];
int flags;
int n;
std::string payload;

try
{

Poco::Net::initializeSSL();

SharedPtr<InvalidCertificateHandler> pCert = new ConsoleCertificateHandler(false); // ask the user via console
Context::Ptr pContext = new Context(Context::TLSV1_CLIENT_USE, "", "", "rootcert.pem", Context::VERIFY_RELAXED, 9, false, "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH");
SSLManager::instance().initializeClient(0, pCert, pContext);

HTTPSClientSession cs("echo.websocket.org", 443);
HTTPRequest request(HTTPRequest::HTTP_GET, "/","HTTP/1.1");
HTTPResponse response;
std::string cmd;

WebSocket * ws = new WebSocket(cs, request, response); // Causes the timeout

payload = "SHAKETHAND";
ws->sendFrame(payload.data(), payload.size(), WebSocket::FRAME_TEXT);
n = ws->receiveFrame(buffer, sizeof(buffer), flags);

std::cout<<"return:"<<std::string(buffer,n)<<"\n";
ws->shutdown();

}

catch (Poco::Exception& ex)
{
std::cout << "Error: " <<__FILE__<<":"<<__LINE__<<":"<< ex.displayText() << "\n";
return -1;
}
return 0;
}