论坛博客怎么啦，半夜还不让写博客啦？

寒山-居士 2014-04-21 11:24:11

Node.Js现在很火？是的，它现在属于后台服务器比较火的方案之一，废话不多说，想了解nodejs自己google去查查，基于javascript的后台服务器框架
最近要做PC客户端的IM工作，而恰好后端使用的nodejs的，做即时通讯等功能，对于nodejs来说应该是绰绰有余，单线程下的高并发，适合创业公司学习。
今天上午本来打算使用Qt下面的QTcpSocket来与后端socket.io建立链接，不曾想，简单的socket链接是无法满足于现状，于是乎，网上找，群内问，终于找到了基于Qt下面的websocket的例子，可惜我现在Qt版本是5.2.1,但是Qt5.3已经将websocket模块集成到啦Qt框架里面啦，真是蛋疼的不得不用最新的，本来想使用QWebsocket源码进行编译，然后与QSocketIO源码进行编译成可用的动态库，但是不曾想，里面的坑太多，只得安装新的Qt5.3Beta包，才得以用之。
现在主要说下QSocketIO的开源代码，代码地址:QSocketIO，老外写的开源的东东，分享精神不错，还是有QWebsocket这个本来是他开源的，后来直接被Qt收录囊中，直接集成到模块，Qt真是个大杂烩，集开源代码于一身。
要使用socket.io QSocketIO已经有例子告诉你如何写。
简单说下Qt部分

#include "echoclient.h"
#include <QtSocketIo/QSocketIOClient>
#include <QtCore/QJsonObject>
#include <QtCore/QJsonArray>
#include <QtCore/QDebug>

#define function(args...) [=](args)

EchoClient::EchoClient(QObject *parent) :
QObject(parent),
m_client()
{
QObject::connect(&m_client, SIGNAL(connected(QString)), this, SLOT(connected(QString)));
QObject::connect(&m_client, SIGNAL(disconnected(QString)), this, SLOT(disconnected(QString)));
QObject::connect(&m_client, SIGNAL(errorReceived(QString,QString)), this, SLOT(errorReceived(QString,QString)));
QObject::connect(&m_client, SIGNAL(heartbeatReceived()), this, SLOT(heartbeatReceived()));
QObject::connect(&m_client, SIGNAL(messageReceived(QString)), this, SLOT(messageReceived(QString)));
}

EchoClient::~EchoClient()
{
}

void EchoClient::open(QUrl url)
{
m_client.open(url);
}

void EchoClient::messageReceived(QString message)
{
qDebug() << "Message Received:" << message;
}

void EchoClient::errorReceived(QString reason, QString advice)
{
qDebug() << "Error received:" << reason << "(advice" << advice << ")";
}

void EchoClient::ackReceived(int messageId, QJsonArray arguments)
{
qDebug() << "Ack received for message with id" << messageId << "arguments:" << arguments;
}

void EchoClient::connected(QString endpoint)
{
qDebug() << "Connected to endpoint" << endpoint;
m_client.emitMessage("event with 2 arguments",
QVariantList() << 1 << QStringLiteral("Hello socket.io，I am Qter"),
function(QJsonArray returnValue) {
qDebug() << "Got reply from event with 2 arguments:" << returnValue;
});
m_client.emitMessage("event with a json object",
QVariantMap({ {"number", 1}, { QStringLiteral("message"), QStringLiteral("Hello socket.io")}}),
function(QJsonArray returnValue) {
qDebug() << "Got reply from event with a json object:" << returnValue;
});
m_client.on("event from server", function(QJsonArray data) {
qDebug() << "Got event from server with data" << data;
});
}

void EchoClient::disconnected(QString endpoint)
{
qDebug() << "Disconnected from endpoint" << endpoint;
}

void EchoClient::heartbeatReceived()
{
qDebug() << "Received heartbeat";
m_client.emitMessage("event with a json object",
QVariantMap({ {"number", 1}, { QStringLiteral("message"), QStringLiteral("Hello socket.io")}}),
function(QJsonArray returnValue) {
qDebug() << "Got reply from event with a json object:" << returnValue;
});
}
创建了一个wssocket连接，connect到服务器，同时也向服务器发送了一些数据，connect(QString str);里面还使用了回调函数，可以拿到服务器给出的应答
再者我们看下nodejs部分
首先需要安装nodejs模块
mac osx下面可以使用brew这个包管理工具类似linux下面的apt工具 windows需要安装nodejs安装包
mac 下面可以直接brew install nodejs,直接可以给你解决各种依赖关系
但是nodejs下面需要使用npm install socket.io 来安装socket.io模块
var io = require('socket.io').listen(8001, {
"log": false,
"close timeout": 30
});

io.sockets.on('connection', function(socket) {
socket.emit('news', 1, 'world', function(data) {
console.log("Message was delivered.");
});
socket.on('event with 2 arguments', function(data1, data2,callback) {
console.log('Received event with arguments:' + data1 + " and " + data2);

//setTwoarg();
function setTwoarg()
{
if (callback) {
callback("Okay received your event with 2 arguments");
}
}
setTimeout(setTwoarg,2000);
});
socket.on('event with a json object', function(object, callback) {
console.log('Received event with object:' + JSON.stringify(object));
if (callback) {
callback("Okay received your json object.");
}
});
socket.emit("event from server", {"attribute1" : "hello", "attribute2": "world!"});
});
这里是nodejs代码
代码就创建了一个socket.io的服务，socket.on是监听客户端的链接，而emit是发送数据出去
socket.io接口如何使用可以参考socket.io网站
Qt部分写好后，在终端运行node server.js 然后客户端启动就可以链接服务器，做各种操作啦。
各位可以畅游服务器与客户端之间
晚安

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