实现QT与Flex、Flash的通信（基于Socket）

??????? 在Windows下，Flex可以通过ActiveX方式通过ExterneralInterface接口与Qt通信，但是在Linux下，ExternalInterface方法就无效了，只能通过Socket方式与Qt通信。进行通信的两端Flex与Qt，需要绑定指定的端口，监听端口发送的数据（字符串），双方做出相应的响应。下面展示一个Qt与Flex进行文字交互的实例，如下图所示。

???????????????????????

?????? 在QT端，首先在主窗口中调用其成员函数initSocket()初始化QTcpSocket连接，调用openSwf()函数初始化窗口部件QWebView，并将Flash嵌入到webView中。

void Widget::initSocket()

{

    process= new QProcess(this);

   m_server = new QTcpServer(this);

   if(true == (m_server->listen(QHostAddress::LocalHost,5150)))

    {

        qDebug() << "bandsuccess!";

    }

   connect(m_server,SIGNAL(newConnection()),this,SLOT(FlexConnected()));

}

??????? 在initSocket()函数中，调用QTcpServer::listen()方法绑定IP和端口地址，并且将newConnection()信号与flash连接完毕FlexConnected()槽相关联。在FlexConnected()槽中，将readyRead()信号与处理TCP数据流接收和处理readPendingDatagrams()槽相关联。在Flex端，首先构造一个QTSocket对象，然后在其构造函数中初始化IP地址、端口和Flex提供的Socket对象，最后调用InitConnect()函数初始化连接。

public function InitConnect():void

{
         socket.connect(server,port);

    //监听套接字连接是否关闭

         socket.addEventListener(Event.CLOSE,closeHandler);

    //监听是否连接上服务器

         socket.addEventListener(Event.CONNECT,connectHandler);

         socket.addEventListener(IOErrorEvent.IO_ERROR,ioErrorHandler);

         socket.addEventListener(SecurityErrorEvent.SECURITY_ERROR,securityErrorHandler);
}

???? QT部分代码：

// widget.h

class Widget : public QWidget

{

   Q_OBJECT

public:

   explicit Widget(QWidget *parent = 0);

   ~Widget();

   void openSwf();

   void processTheDatagram(QByteArray array);

private slots:

   void on_pushButton_clicked();

   void readPendingDatagrams();

   void FlexConnected();

private:

   void initSocket();

private:

   Ui::Widget *ui;

   QTcpServer *m_server;

   QTcpSocket *m_socket;

   QProcess* process;

   QString tempDir;

   QString tempFilename;

};

 

//widget.cpp

#define TEMP_DIR     "/temp/"

#define TEMP_FILE    "QTFLEX/QTFLEX.html"

#define REPLACE_STRING "{#AAA}"

Widget::Widget(QWidget *parent) :

   QWidget(parent),ui(new Ui::Widget)

{

   ui->setupUi(this);

   tempDir = qApp->applicationDirPath() + TEMP_DIR;

    qDebug()<< "tempDir: " << tempDir;

   tempFilename = tempDir + TEMP_FILE;

   qDebug() << "tempFilename" << tempFilename;

   initSocket();

   openSwf();

}

Widget::~Widget()

{

   m_server->close();

   delete m_server;

   delete process;

}

void Widget::initSocket()

{

   process = new QProcess(this);

   m_server = new QTcpServer(this);

   if(true == (m_server->listen(QHostAddress::LocalHost,5150)))

    {

       qDebug() << "band success！";

    }

   connect(m_server,SLOT(FlexConnected()));

}

//Flex连接上事件

void Widget::FlexConnected()

{

   qDebug() << "flash连接成功！";

   m_socket = m_server->nextPendingConnection();

   connect(m_socket,SIGNAL(readyRead()),SLOT(readPendingDatagrams()));

}

QByteArray CreatePolicy()

{

   char szPolicy[1024] = "";

   memset(szPolicy,'',1024);

   strcat(szPolicy,"<?xml version='1.0'?>");

   strcat(szPolicy,"<cross-domain-policy>");

   strcat(szPolicy,"<site-control permitted-cross-domain-policies='all'/>");

   strcat(szPolicy,"<allow-access-from domain='*'to-ports='5150'/>");

   strcat(szPolicy,"</cross-domain-policy>");

   return QByteArray(szPolicy);

}

void Widget::readPendingDatagrams()

{

   qDebug() << "准备接受!";

   QByteArray datagram;

   datagram = m_socket->readAll();

   m_socket->seek(0);

   if(0 ==(strcmp("<policy-file-request/>",datagram.constData() )))

    {

       //首先发送安全协商报文，然后关闭socket，等待Flex重新连接

       qDebug() << "安全认证完毕!";

       QByteArray strPolicy = CreatePolicy();

       m_socket->write(strPolicy);

       m_socket->close();

    }

   else

    {

       processTheDatagram(datagram);

    }

}

void Widget::openSwf()

{

   //设置webkit参数

   QWebSettings *set = QWebSettings::globalSettings();

    set->setAttribute(QWebSettings::JavascriptEnabled,true);

   set->setAttribute(QWebSettings::PluginsEnabled,true);

   set->setAttribute(QWebSettings::JavascriptCanOpenWindows,true);

   set->setAttribute(QWebSettings::DeveloperExtrasEnabled,true);

   QString dirPath = qApp->applicationDirPath();

   dirPath = dirPath.left(dirPath.lastIndexOf('/'));

   qDebug() << dirPath;

   ui->webView->load(QUrl(tempFilename));

   ui->webView->show();

}

void Widget::processTheDatagram(QByteArrayarr)

{

   qDebug()<<"comming";

   QString s="";

   s.append(arr);

   ui->textEdit->append(s);

}

void Widget::on_pushButton_clicked()

{

    QString str=ui->lineEdit->text();

    if(str==NULL || str=="")

    {

      return;

    }

   else

    {

      str="QT:"+str;

      ui->textEdit->append(str);

      m_socket->write(str.toAscii());

      m_socket->close();

    }

}

??? Flex部分代码，在Flex3下编译通过：

//QTFLEX.mxml
<mx:Script>

        <![CDATA[

           import mx.controls.Alert;

           public var socket:QTSocket;

           

                 public function initApp():void

                 {

                     socket=new QTSocket();

                            socket.InitConnect();

                 }

                 public function sendMsg():void

                 {

                    var str:String=msg.text;

                    if(str==null ||str=="")

                    {

                         Alert.show("发送内容不能为空!");

                         return;

                     }

                     str="FLEX:"+str;

                     AddMsgToArea(str);

                     socket.MsgSendHandler(str);

                 }

                 public functionAddMsgToArea(str:String):void

                 {

                      varstr1:String=ta.text;

                      ta.text=str1+"n"+str;

                 }

        ]]>

 </mx:Script>

<mx:Button x="188" y="264"label="发送" height="26" width="62"click="sendMsg();"/>

<mx:TextInput x="10"y="264" width="170" height="26"id="msg"/>

<mx:TextArea x="4"y="6" height="250" width="247"id="ta"/>

</mx:Application>

 

// QTSocket.as

package

{

         importflash.net.Socket;

         importflash.events.*;

         importflash.utils.ByteArray;

         importmx.controls.Alert;

         publicclass QTSocket

         {

                   publicvar server:String;

                   publicvar port:int=5150;

                   publicvar socket:Socket=null;

                   publicfunction QTSocket()

                   {

                            server="localhost";

                            port=5150;

                            socket=newSocket();

                   }

                   //Socket初始化

                   publicfunction InitConnect():void

                   {

                            socket.connect(server,port);

                            //监听套接字连接是否关闭

                            socket.addEventListener(Event.CLOSE,closeHandler);

                            //监听是否连接上服务器

                            socket.addEventListener(Event.CONNECT,connectHandler);

                            socket.addEventListener(IOErrorEvent.IO_ERROR,ioErrorHandler);

                            socket.addEventListener(SecurityErrorEvent.SECURITY_ERROR,securityErrorHandler);

                   }

                   //发送消息

                   publicfunction MsgSendHandler(msg:String):void

                   {

                            if(socket != null)

                            {

                                     varbytes:ByteArray=new ByteArray(); //新建一个ByteArray存放数据

                                     bytes.writeUTFBytes(msg);

                                     //写入数据，以utf-8格式传数据避免中文乱码

                                     socket.writeBytes(bytes);

                                     socket.flush();

                            }

                   }

                   //Socket接到消息

                   publicfunction MsgRecvedHandler(event:ProgressEvent):void

                   {

                            vararray:ByteArray=new ByteArray();

                            socket.readBytes(array);

                            varmsg:String=new String(array);

           Alert.show(msg);

                   }

                   privatefunction connectHandler(event:Event):void

                  {

                            trace("connectHandler:" + event);

                            socket.addEventListener(ProgressEvent.SOCKET_DATA,MsgRecvedHandler);

                            MsgSendHandler("str");//消息体

                   }

                   privatefunction closeHandler(event:Event):void

                   {

                            trace("closeHandler:" + event);

                   }

                   privatefunction ioErrorHandler(event:IOErrorEvent):void

                   {

                            trace("ioErrorHandler:" + event);

                   }

                   privatefunction securityErrorHandler(event:SecurityErrorEvent):void

                   {

                            trace("securityErrorHandler:" + event);

                   }

         }

}

??? 阿科

??? 2013年1月6日于北京邮电大学新科研楼302室