Qt网络编程

Qt提供了Socket的支持,它采用API形式的封装,使得程序员不需要接触底层的代码就可以对socket进行操作。

 

1.UDP的实现

UDP不是连接协议,没有客户端与服务端的概念。

1)建立套接字相关对象

1 QSocketDevice *MUReceiveSocket;//套接字对象
2 
3 QSocketNotifier *MSocketNotifier;//套接字监听对象

 

 

2)初始化套接字相关对象

 1 MUReceiveSocket = new QSocketDevice(QSocketDevice::Datagram);
 2 
 3 //UDP初始化
 4 
 5       QHostAddress MyAddress;
 6 
 7       QString FakeAddress;
 8 
 9       FakeAddress = get_eth1_ip();
10 
11 //取得接口IP
12 
13       MyAddress。setAddress(FakeAddress);
14 
15       MUReceiveSocket->bind(MyAddress,port);
16 
17 //绑定到指定网络接口地址(IP),指定逻辑端口
18 
19 MSocketNotifier = new QSocketNotifier(MUReceiveSocket->socket(),QSocketNotifier::Read,0,"MSocketNotifier");
20 
21 //监听MUReceiveSocket套接字
22 
23  

 

3)定义实现响应slot

 1 virtual void OnMReceive();
 2 
 3 void Client::OnMReceive()
 4 
 5 {
 6 
 7   int ByteCount,ReadCount;
 8 
 9   char *IncomingChar;
10 
11   fprintf(stderr,"Load a piece of Message!\n");
12 
13   ByteCount = MUReceiveSocket->bytesAvailable();
14 
15   InconingChar = (char *)malloc(ByteCount + 1);
16 
17   ReadCount = MUReceiveSocket->readBlock(IncomingChar,ByteCount);
18 
19   IncomingChar[ByteCount] = '\0';
20 
21   fprintf(stderr,"%s",IncomingChar);
22 
23 }
24 
25  

 

4)关联套接字的signal和接收slot。

1 connect(MSocketNotifier,SIGNAL(activated(int)),this,SLOT(OnMReceive()));
2 
3 //当MSocketNotifier检测到MUReceiveSocket活跃时调用OnMReceive
4 
5  

 

5)发送字符串

1 char information[20];
2 
3 strcpy(information,"abc");
4 
5 MUReceiveSocket->writeBlock(information,length,MyAddress,2201);

 

 

2.TCP的实现

TCP的实现与UDP的实现大同小异,它是面向连接的协议。

1)服务端

1>套接字对象的定义

1 QSSocket *ServerSocket;
2 
3 QSocketDevice *ClientSocket;
4 
5 QSocketNotifier *ClientNotifier;
6 
7 QSocketNotifier *ServerNotifier;

 

 

2>套接字的初始化

 1 QHostAddress MyAddress;
 2 
 3 QString FakeAddress;
 4 
 5 FakeAddress = "127.0.0.1";
 6 
 7 MyAddress。setAddress(FakeAddress);
 8 
 9 UINT Port = 1234;
10 
11 ServerSocket = new QSSocket(MyAddress,Port,this,0);
12 
13 //指定监听地址及端口
14 
15 ClientSocket = new QSocketDevice(QSocketDevice::Stream);
16 
17 ClientNotifier = new QSocketNotifier(ClientSocket->socket(),QSocketNotifier::Read,0,"ClientSocket");

 

 

3>响应连接

1 只需要在QSSocket的构造函数里添加如下代码。
2 
3 Server Socket->new Connection(ClientSocket->socket());
4 
5 当受到客户端的连接后,ClientSocket会自动响应,并接收连接。

 

4>接收信息slot与UDP是一样的

 

2)客户端的实现

1 客户端的实现与UDP实现不同之处是客户端套接字不需要bind端口,因为连接上服务器端后TCP会保持这个连接,直到通信结束。

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posted @ 2013-09-01 15:37  万载一梦  阅读(496)  评论(0编辑  收藏  举报