使用Poco C++庫建立websocket安全訪問(wss)用戶端

 　　Poco websocket庫特點:

　　1,使用http/https ClientSession建立websocket client

　　2,是同步的,這對C++案頭編程來說應該是夠用的.

　　3,依賴openssl.

代碼如下

#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;       }

　　WS用戶端建立不再贅述,官方已有範例.