Add echo_client example

Author: Peter Thorson

SConstruct

@@ -231,6 +231,9 @@ if not env['PLATFORM'].startswith('win'):
 # echo_server
 echo_server = SConscript('#/examples/echo_server/SConscript',variant_dir = builddir + 'echo_server',duplicate = 0)
 
+# echo_client
+echo_client = SConscript('#/examples/echo_client/SConscript',variant_dir = builddir + 'echo_client',duplicate = 0)
+
 # echo_server_tls
 if tls_build:
     echo_server_tls = SConscript('#/examples/echo_server_tls/SConscript',variant_dir = builddir + 'echo_server_tls',duplicate = 0)

changelog.md

@@ -27,6 +27,8 @@ HEAD
   and `string::empty()`. This avoids generating unnecessary temporary objects.
   #468 Thank you Vladislav Yaroslavlev for reporting and a patch.
 - Documentation: Adds an example demonstrating the use of external `io_service`
+- Documentation: Adds a simple echo_client example.
+- Documentation: Begins migration of the web based user manual into Doxygen.
 - Bug: Fix memory leak when init_asio produces an error. #454 Thank you Mark 
   Grimes for reporting and fixing.
 - Bug: Fix crash when processing a specially crafted HTTP header. Thank you Eli 

examples/echo_client/CMakeLists.txt

@@ -0,0 +1,12 @@
+
+file (GLOB SOURCE_FILES *.cpp)
+file (GLOB HEADER_FILES *.hpp)
+
+init_target (echo_client)
+
+build_executable (${TARGET_NAME} ${SOURCE_FILES} ${HEADER_FILES})
+
+link_boost ()
+final_target ()
+
+set_target_properties(${TARGET_NAME} PROPERTIES FOLDER "examples")

examples/echo_client/SConscript

@@ -0,0 +1,23 @@
+## echo_client example
+##
+
+Import('env')
+Import('env_cpp11')
+Import('boostlibs')
+Import('platform_libs')
+Import('polyfill_libs')
+
+env = env.Clone ()
+env_cpp11 = env_cpp11.Clone ()
+
+prgs = []
+
+# if a C++11 environment is available build using that, otherwise use boost
+if env_cpp11.has_key('WSPP_CPP11_ENABLED'):
+   ALL_LIBS = boostlibs(['system'],env_cpp11) + [platform_libs] + [polyfill_libs] + ['z']
+   prgs += env_cpp11.Program('echo_client', ["echo_client.cpp"], LIBS = ALL_LIBS)
+else:
+   ALL_LIBS = boostlibs(['system','random'],env) + [platform_libs] + [polyfill_libs] + ['z']
+   prgs += env.Program('echo_client', ["echo_client.cpp"], LIBS = ALL_LIBS)
+
+Return('prgs')

examples/echo_client/echo_client.cpp

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2016, Peter Thorson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the WebSocket++ Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <websocketpp/config/asio_no_tls_client.hpp>
+#include <websocketpp/client.hpp>
+
+#include <iostream>
+
+typedef websocketpp::client<websocketpp::config::asio_client> client;
+
+using websocketpp::lib::placeholders::_1;
+using websocketpp::lib::placeholders::_2;
+using websocketpp::lib::bind;
+
+// pull out the type of messages sent by our config
+typedef websocketpp::config::asio_client::message_type::ptr message_ptr;
+
+// This message handler will be invoked once for each incoming message. It
+// prints the message and then sends a copy of the message back to the server.
+void on_message(client* c, websocketpp::connection_hdl hdl, message_ptr msg) {
+    std::cout << "on_message called with hdl: " << hdl.lock().get()
+              << " and message: " << msg->get_payload()
+              << std::endl;
+
+
+    websocketpp::lib::error_code ec;
+
+    c->send(hdl, msg->get_payload(), msg->get_opcode(), ec);
+    if (ec) {
+        std::cout << "Echo failed because: " << ec.message() << std::endl;
+    }
+}
+
+int main(int argc, char* argv[]) {
+    // Create a client endpoint
+    client c;
+
+    std::string uri = "ws://localhost:9002";
+
+    if (argc == 2) {
+        uri = argv[1];
+    }
+
+    try {
+        // Set logging to be pretty verbose (everything except message payloads)
+        c.set_access_channels(websocketpp::log::alevel::all);
+        c.clear_access_channels(websocketpp::log::alevel::frame_payload);
+
+        // Initialize ASIO
+        c.init_asio();
+
+        // Register our message handler
+        c.set_message_handler(bind(&on_message,&c,::_1,::_2));
+
+        websocketpp::lib::error_code ec;
+        client::connection_ptr con = c.get_connection(uri, ec);
+        if (ec) {
+            std::cout << "could not create connection because: " << ec.message() << std::endl;
+            return 0;
+        }
+
+        // Note that connect here only requests a connection. No network messages are
+        // exchanged until the event loop starts running in the next line.
+        c.connect(con);
+
+        // Start the ASIO io_service run loop
+        // this will cause a single connection to be made to the server. c.run()
+        // will exit when this connection is closed.
+        c.run();
+    } catch (websocketpp::exception const & e) {
+        std::cout << e.what() << std::endl;
+    }
+}