Network/TcpClient: Add Connect overload resolving hostname

Former-commit-id: 5c667a14c591e4e9cb898a8d4c83fedf161179fd

include/Nazara/Network/Enums.hpp

@@ -46,6 +46,7 @@ namespace Nz
 		SocketError_NetworkError,             //< The network system has failed (maybe network is down)
 		SocketError_NotInitialized,           //< Nazara network has not been initialized
 		SocketError_NotSupported,             //< The operation is not supported (e.g. creating a bluetooth socket on a system without any bluetooth adaptater)
+		SocketError_ResolveError,             //< The hostname couldn't be resolved (more information in ResolveError code)
 		SocketError_ResourceError,            //< The operating system lacks the resources to proceed (e.g. memory/socket descriptor)
 		SocketError_UnreachableHost,          //< The host is not reachable
 		SocketError_TimedOut,                 //< The operation timed out
@@ -60,6 +61,7 @@ namespace Nz
 		SocketState_Connecting,   //< The socket is currently connecting
 		SocketState_Connected,    //< The socket is currently connected
 		SocketState_NotConnected, //< The socket is not connected (or has been disconnected)
+		SocketState_Resolving,    //< The socket is currently resolving a hostname
 
 		SocketState_Max = SocketState_NotConnected
 	};

include/Nazara/Network/IpAddress.hpp

@@ -29,8 +29,8 @@ namespace Nz
 			inline IpAddress(const IPv6& ip, UInt16 port = 0);
 			inline IpAddress(const UInt8& a, const UInt8& b, const UInt8& c, const UInt8& d, UInt16 port = 0);
 			inline IpAddress(const UInt16& a, const UInt16& b, const UInt16& c, const UInt16& d, const UInt16& e, const UInt16& f, const UInt16& g, const UInt16& h, UInt16 port = 0);
-			inline IpAddress(const char* address);
+			inline explicit IpAddress(const char* address);
-			inline IpAddress(const String& address);
+			inline explicit IpAddress(const String& address);
 			IpAddress(const IpAddress&) = default;
 			IpAddress(IpAddress&&) = default;
 			~IpAddress() = default;

include/Nazara/Network/TcpClient.hpp

@@ -24,6 +24,7 @@ namespace Nz
 			~TcpClient() = default;
 
 			SocketState Connect(const IpAddress& remoteAddress);
+			SocketState Connect(const String& hostName, NetProtocol protocol = NetProtocol_Any, const String& service = "http", ResolveError* error = nullptr);
 			inline void Disconnect();
 
 			void EnableLowDelay(bool lowDelay);

src/Nazara/Network/TcpClient.cpp

@@ -41,6 +41,34 @@ namespace Nz
 		return state;
 	}
 
+	SocketState TcpClient::Connect(const String& hostName, NetProtocol protocol, const String& service, ResolveError* error)
+	{
+		Disconnect();
+
+		UpdateState(SocketState_Resolving);
+		std::vector<HostnameInfo> results = IpAddress::ResolveHostname(protocol, hostName, service, error);
+		if (results.empty())
+		{
+			m_lastError = SocketError_ResolveError;
+
+			UpdateState(SocketState_NotConnected);
+			return m_state;
+		}
+
+		IpAddress hostnameAddress;
+		for (const HostnameInfo& result : results)
+		{
+			//TODO: Check PF_ type (TCP)
+			if (!result.address)
+				continue;
+
+			hostnameAddress = result.address;
+			break; //< Take first valid address
+		}
+
+		return Connect(hostnameAddress);
+	}
+
 	void TcpClient::EnableLowDelay(bool lowDelay)
 	{
 		NazaraAssert(m_handle != SocketImpl::InvalidHandle, "Invalid handle");