この問題の回避策を見つけました。ssl::stream クラスをソケット オブジェクトとして使用していますが、エラーの理由は接続メソッドがないためです。ただし、connect または async_connect メソッドを呼び出すことができるオブジェクトを返す next_layer() メソッドがあります。async_connect をコンパイルするのに問題がありましたが、connect メソッドは機能します。その後、次のように HandleConnect メソッドを呼び出します。
boost::system::error_code EC;
pSocket->next_layer().connect(EP, EC);
HandleConnect(EC);
コードに対する@SamMillerリクエストへの回答として、以下に示します。boost::asio::async_connect 呼び出しのエンドポイントのイテレータを作成する方法と、 next_layer オブジェクトの async_connect メソッドを呼び出す方法を知りたいです。
void SSLSocket::Connect(SSLSocket* psSLS, const string& serverPath, string& port)
{
// Connects to the server.
// serverPath - specifies the path to the server. Can be either an ip address or url.
// port - port server is listening on.
//
try
{
Locking CodeLock(SocketLock); // Single thread the code.
// If the user has tried to connect before, then make sure everything is clean before trying to do so again.
if (pSocket)
{
delete pSocket;
pSocket = 0;
}
// If serverPath is a URL, then resolve the address.
if ((serverPath[0] < '0') || (serverPath[0] > '9')) // Assumes that the first char of the server path is not a number when resolving to an ip addr.
{
// Create the resolver and query objects to resolve the host name in serverPath to an ip address.
boost::asio::ip::tcp::resolver resolver(*IOService);
boost::asio::ip::tcp::resolver::query query(serverPath, port);
boost::asio::ip::tcp::resolver::iterator EndpointIterator = resolver.resolve(query);
// Set up an SSL context.
boost::asio::ssl::context ctx(*IOService, boost::asio::ssl::context::tlsv1_client);
// Specify to not verify the server certificiate right now.
ctx.set_verify_mode(boost::asio::ssl::context::verify_none);
// Init the socket object used to initially communicate with the server.
pSocket = new boost::asio::ssl::stream<boost::asio::ip::tcp::socket>(*IOService, ctx);
//
// The thread we are on now, is most likely the user interface thread. Create a thread to handle all incoming socket work messages.
// This thread is created for each connection to a server.
if (!RcvThreadCreated)
{
WorkerThreads.create_thread(boost::bind(&SSLSocket::RcvWorkerThread, this));
RcvThreadCreated = true;
WorkerThreads.create_thread(boost::bind(&SSLSocket::SendWorkerThread, this));
}
// Try to connect to the server. Note - add timeout logic at some point.
boost::asio::async_connect(pSocket->lowest_layer(), EndpointIterator,
boost::bind(&SSLSocket::HandleConnect, this, boost::asio::placeholders::error));
}
else
{
// serverPath is an ip address, so try to connect using that.
//
// Create an endpoint with the specified ip address.
const boost::asio::ip::address IP(boost::asio::ip::address::from_string(serverPath));
int iport = atoi(port.c_str());
const boost::asio::ip::tcp::endpoint EP(IP, iport);
// Set up an SSL context.
boost::asio::ssl::context ctx(*IOService, boost::asio::ssl::context::tlsv1_client);
// Specify to not verify the server certificiate right now.
ctx.set_verify_mode(boost::asio::ssl::context::verify_none);
// Init the socket object used to initially communicate with the server.
pSocket = new boost::asio::ssl::stream<boost::asio::ip::tcp::socket>(*IOService, ctx);
//
// The thread we are on now, is most likely the user interface thread. Create a thread to handle all incoming socket work messages.
// This thread is created for each connection to a server.
if (!RcvThreadCreated)
{
WorkerThreads.create_thread(boost::bind(&SSLSocket::RcvWorkerThread, this));
RcvThreadCreated = true;
WorkerThreads.create_thread(boost::bind(&SSLSocket::SendWorkerThread, this));
}
// Try to connect to the server. Note - add timeout logic at some point.
// pSocket->next_layer().async_connect(EP, &SSLSocket::HandleConnect);
boost::system::error_code EC;
pSocket->next_layer().connect(EP, EC);
if (EC)
{
// Log an error. This worker thread should exit gracefully after this.
stringstream ss;
ss << "SSLSocket::Connect: connect failed to " << sClientIp << " : " << uiClientPort << ". Error: " << EC.message() + ".\n";
Log.LogString(ss.str(), LogError);
}
HandleConnect(EC);
}
}
catch (std::exception& e)
{
stringstream ss;
ss << "SSLSocket::Connect: threw an error - " << e.what() << ".\n";
Log.LogString(ss.str(), LogError);
Stop();
}
}
これは、次の行の場合に生成されるエラーです。
pSocket->next_layer().async_connect(EP, &SSLSocket::HandleConnect); // Does not compile
は次のように置き換えられます:
boost::system::error_code EC;
pSocket->next_layer().connect(EP, EC); // Compiles and works properly.
エラーメッセージ：
1>c:\boost_1_52_0\boost\asio\basic_socket.hpp(706) : error C2064: term does not evaluate to a function taking 1 arguments
1> c:\users\bob\documents\visual studio 2008\projects\attackpoker1\win32client\sslsockets\sslsocket.cpp(114) : see reference to function template instantiation 'void boost::asio::basic_socket<Protocol,SocketService>::async_connect<void(__thiscall SSLSocket::* )(const boost::system::error_code &)>(const boost::asio::ip::basic_endpoint<InternetProtocol> &,const ConnectHandler &)' being compiled
1> with
1> [
1> Protocol=boost::asio::ip::tcp,
1> SocketService=boost::asio::stream_socket_service<boost::asio::ip::tcp>,
1> InternetProtocol=boost::asio::ip::tcp,
1> ConnectHandler=void (__thiscall SSLSocket::* )(const boost::system::error_code &)
1> ]