unix network programming volume 1

ps:sdoi2016 Round1 after Konjac Konjac began to do network flow to self-rescue (2016-04-11 in a few days to test first, now do network flow 24 seemingly nothing with ← retired rhythm)The topic will be attached to the date, witness my turtle speed brush problem.1. Pilot pairing Programme 2016-04-11Binary graph maximum matching problem, updated the $dinic$ template

Connection--listen ()Function: Used for a connection-oriented server, indicating that it is willing to receive connections.Format: int PASCAL far Listen (SOCKET s, int backlog);5. Data transmission--send () and recv ()Function: Data sending and receivingFormat: intpascal farsend (sockets,const charfar buf,int len,int flags);int PASCAL far recv (SOCKET s,const char far buf,int len,int flags);Parameter: BUF: Pointer to the buffer that contains the transmitted data.6. Multiplexing--select ()Functi

After the DNS query results are cached, the successful result is permanently cached, the failure result is cached 10s, the following method to set the success and failure of the cache time//0 is not cached,-1 is never expired, other units are SSecurity.setproperty ("Networkaddress.cache.ttl", "10");Security.setproperty ("Networkaddress.cache.negative.ttl", "3");//If an IP address is passed in, no DNS query is madeInetAddress address=inetaddress.getbyn

1. socket programming principles A complete inter-network communication process must be composed of two processes and can only use the same high-level protocol. That is to say, TCP is not allowed for communication, and UDP is used for the other end. A complete network information must be identified by a quintuple: Prot

Preface: Before learning the use of nsurlsession, learn a good article about Nsurlsession "from nsurlconnection to Nsurlsession" or a domestic translation "from the Nsurlconnection to Nsurlsession ", or do not have to learn my blog Park notes directly to learn from the nsurlconnection to Nsurlsession" is also possible, this article on the use of nsurlsession has a very detailed discussion. But first of all, this paper briefly introduces the basic of Nsurlsession and base

1,What types of information transmission methods can a computer network be divided? A: It can be divided into wired and wireless networks. 2,Briefly describe the features of computer networks. A: According to the characteristics of computer networks: The so-called computer network has three meanings: ① Two or more independent computer systems must be connect

the command:#服务端ImportSocketImportSubprocessserver= Socket.socket (socket.af_inet,socket. SOCK_STREAM)#Build ServicesServer.bind (('127.0.0.1', 8080))#listening for IP and portsServer.listen (5)Print('Server Run .....') whiletrue:conn,client_addr=server.accept ()#wait for client connection to establish connection object Conn Print(CLIENT_ADDR)#Print Client connection information whileTrue:Try: Client_msg= CONN.RECV (1024)#receiving client Messagesres = subprocess. Popen (Client_msg.decod

one:public void Run () {Synchronized (a) {Hold object lock A, wait for object lock bSynchronized (b) {code block;}}}Code executed by thread two:public void Run () {Synchronized (b) {Hold object lock B, wait for object lock aSynchronized (a) {code block;}}}Experience:In future development, remember not to use the nested structure of the synchronous statement block!!!2.6 Common methods in the object classvoid Wait ()-Used to get the current thread into a wait state until another thread calls the

("www.ptpress.com.cn", 80);OutputStream outputstream = Socket.getoutputstream ();OutputStreamWriter outputstreamwriter = new OutputStreamWriter (outputstream);BufferedWriter bufferedwriter = new BufferedWriter (outputstreamwriter);Bufferedwriter.write ("Hello");Bufferedwriter.flush ();Note: After you use the Write method of OutputStream to output data, you must flush the output buffer with the Flush method to send the data in the output buffer. If you want to output strings, you can use both Ou

: 0.0.0.0––127.255.255.255, the standard subnet mask is 255.0.0.0. Class B IP Address Scope: 128.0.0.0––191.255.255.255, the standard subnet mask is 255.255.0.0. Class C IP Address Scope: 192.0.0.0––223.255.255.255, the standard subnet mask is 255.255.255.0. As you can see from the above description, the first byte between 0 and 127 is a Class A IP address, between 128 and 191 is a class B IP address, and between 192 and 223 is the C class IP address. If the two IP addresses and their subne

Currently, for bean sprouts I have just started with network programming, the most intuitive understanding of network programming is data transmission between some clients and a server. The specifics are complex, but I will learn them later. Today, I learned that the client and server can be connected through socket a

Network Programming series in Android (1): URLConnection The URL (Uniform Resource Locator) object represents a unified Resource Locator, which is a pointer to Internet resources. The URL consists of the protocol name, host, port, and resource Path Components: protocol://host:port/path For example, http://kan.sogou.com/dianying/#a urladdress.URL provides mult

In Android Network Communication, sockets are usually used for data communication between the number of devices and Http is used for network data requests.1. Socket)Anyone with Java development experience or. NET development experience should have a more or less understanding of Socket. Common TCP or UDP protocols are actually implemented based on Socket.A Socket

() or Kill () method to stop the process process p = new Process ();p. Startinfo.filename = notepad Span style= "color: #800000;" >"; // p.startinfo.arguments = ; // P.startinfo.windowstyle = processwindowstyle.maximized; // p.start ();p. WaitForInputIdle (); //waits for the process to start, making sure that the relevant information can be obtained later Thread.Sleep (+); // P.kill (); // P.closemainwindow (); About two ways to stop a process:In the case of a graphical interfac

1. Basic TCP network programming modeThe first is the server. The server uses serversocket, Import java.net .*;Import java. Io .*; Public class tcpserver {Public static void main (string [] ARGs) throws exception {Serversocket Ss = new serversocket (6666 );While (true ){ Socket S = ss. Accept (); Datainputstream Dis = new datainputstream (S. getinputst

The content is these drawings hahaDo the front-end a bit like painting, it feels kinda interesting ha haha"Memory Box"--Network Programming JSP Web page make a double-breezy note 1

procedure? In fact, it is very simple to create a socket class object in the server program, create a socket class object in the client program, and then hand over the network communication work such as connection and data transmission to them. text-indent:21.0pt;mso-char-indent-count:2.0">After understanding the socket communication model, Do you think Windows Socket network

[Preface:] When writing a WEB program, we often judge the validity of a string, for example, whether a string is a number or a valid Email address. If you do not use a regular expression, the program will be very long and prone to errors. If you use a regular expression, it is easy to make these judgments. This topic describes the concept and format of a regular expression. The application examples in PHP and ASP are used to increase the reader's perceptual knowledge. Regular Expressions are wid

[Foreword:] When we write a Web program, we often judge the validity of a string, such as whether a string is a number, whether it is a valid email address, and so on. If you do not use regular expressions, then the judgment of the program will be very long and error prone, if the use of regular expressions, these judgments is a very easy job. This paper introduces the concept and format of regular expressions in a comprehensive way. And in the PHP, ASP application Examples to increase the reade