winsock dll

The Windows Sockets API interface provided by this system (winking) is a function (routine) as defined in version 1.1 of WINSOCK (as appendix) published on January 20, 1993; includes 30 Berkeley Software Dis Tribution (BSD) function and 16 functions that conform to the Windows message-driven feature. (one) Inet_ntoa (): Converts a network address into a "point format" string. Format: Char FAR * PASCAL FAR inet_ntoa (struct in_addr in); Parameter: I

Abstract: Based on Winsock technology and network communication principles, this paper uses VC ++ programming technology to obtain real-time temperature running graphics on the client through network data transmission, remote monitoring of the temperature running status of the artificial climate room is implemented to meet the real-time automation requirements of low cost and high efficiency. 1 Introduction With the continuous development of network

#include "winsock2.h" #pragma comment (lib, "Ws2_32.lib") SOCKET s;sockaddr_in remoteaddr; SOCKET client;int Naddrlen;s=socket (AF_INET,SOCK_STREAM,IPPROTO_TCP); if (s==invalid_socket) { return;} Sockaddr_in sin;sin.sin_family=af_inet;sin.sin_port=htons (SIN.SIN_ADDR); S_un. S_addr=inaddr_any;if (Bind (S, (lpsockaddr) sin,sizeof (sin)) ==socket_error) { return;} if (Listen (s,2) ==socket_error) { return;} Naddrlen=sizeof (REMOTEADDR); while (true) {client=accept (S, (s

When LoadRunner was recently used to perform a performance test on the Winsock protocol, the tested webserver was JBoss and often encountered a 10053 error. The phenomenon is as follows: After I used lrs_create_socket to create a connection, when the number of requests for this socket connection reaches 100, this connection is unavailable and must be closed before re-create. LoadRunner prompts error: Error: socket0-software caused connection abort. Er

resources. However, in WinSock, there are two zookeeper modes: "blocking" and "non-blocking.Generally, refer is not blocked. If the clienttype attribute is set to ctnonblocking, The clienttype indicates that the clienttype is connected in non-blocking mode. When the socket on the server is used to initiate or terminate operations, the onread or onwrite event will be notified when the socket on the server is used.For the server socket, if the serverty

Winsock study Note 6: iocp completes the port model Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Unit unit1; Interface UsesWinsock2, windows, messages, sysutils, variants, classes, graphics, controls, forms,Dialogs, stdctrls, extctrls; Type// Single Io Data StructureLper_io_operation_data = ^ tper_io_operation_data;Tper_io_operation_data = packed recordOverlapped: wsaoverlapped;Databuf: wsabuf;Buf

must also be managed very carefully. By carefully applying for and releasing memory, or applying lookaside lists (a high-speed cache) technology, you can reuse the allocated memory, it will help to control the memory overhead of the server application (the original article is "Let the server application leave a little footprint "), this prevents the operating system from frequently switching the physical memory applied by the application to the virtual memory (the original article is "enabling

The wsaasyncselect model of the WinSock programming interface is centered on the wsaasyncselect function. The wsaasyncselect model converts a network event notification to a Windows message and sends it to the specified window. For example, if the socket receives a packet, this model will send the notificationConverts a message to a Windows message and sends it to the specified window. Then you can process the message, and the read data will not be bl

Multicast refers to a group of hosts, where one host sends data and other hosts in the group receive the data. First, describe the principles of Multicast: We also regard the vro192.168.192.168.0.1 port as a host, so that four hosts are connected to the vswitch. According to the principle of Ethernet, the switch does not know the existence of the IP address, but only the MAC address. The switch forwards data packets to a port based on the destination MAC address, so that only hosts with this MAC

1. About udp: Compared with tcp, udp is an unreliable protocol. Isn't there a saying that "there is always something that has its advantages? Although the reliability of udp is not high enough, but the transmission efficiency is very high, the speed is also very fast, so a lot of use. 2. precautions before communication: Because Programming Based on windows interfaces is used, before communication, you must initialize the Windows Sockets service. (1) Use the WSAStartup () function to initialize

error code:%d/n", GetLastError ());Closesocket (Pperhandledata->sock);Delete Pperhandledata;Continue}Post Acceptmemset ( (Pperiodata->ol), 0, sizeof (Pperiodata->ol));Postaccept (Pperiodata);//Post Receive DWORD dwFlags = 0; if (Socket_error = = WSASend (Pperhandle->sock, (Pperio->wsabuf), 1, dwtrans, DwFlags, (pperio- >ol) (NULL)) { if (wsa_io_pending! = WSAGetLastError ()) { printf ("WSASend failed with error code:%d/n", WSAGetLastError ()); Closesocket (Pperhandle->sock); Delete ppe

The original source "Windows network Programming Technology" The 8th chapter completes the Port modelSince the original book is attached to the C code, I translate it into Delphi code.Where Winsock2.pas in the Delphi without, to download the additional Http://jungla.dit.upm.es/~bti/files/winsock2.pasProgram Completionio;{$APPTYPE CONSOLE}UsesSysutils,WinSock2 in ' Winsock2.pas ',Mains in ' Mains.pas ';BeginMain ();End.Module Name:iocmplt.cpp//Description://This is sample illustrates how to devel

Recently in writing their own development library to write to the socket is a headache, that is sent when the content may be larger than the buffer, and when the reception is not good to judge when to receive the data. So write a send and split after the packet received after the splicing solution. I used a select when I judged whether the data was transmitted at the end of the receipt. Here is an example of a blocking type. First, we need to define a constant, which is the size of each package

, you can open more than one thread to handle multiple I/O, of course, the internal optimization of the system will certainly be better than your performance, hehe.I just said a little bit. overlap [overlapped] did not analyze you from the point of view of the code. I hope you can understand the overlap Io. Look at Windows network programming, it's not a model.Finally mention the shortcomings of the overlapping model, he opened a thread for each IO request, when there are 1000 requests, then the

); WSACleanup(); return 1;}Socket prototype:Socketin int AF,//protocol address family, using IPV4 to describe Winsock, set to Af_inetin int type,//socket type, TCP/IP set to SOCK_STREAM,UDP/IP set to Sock_dgramin int protocol//For delivery qualification with multiple ingress for a given address family and type, TCP set to IPPROTO_TCP,UDP set to IPPROTO_UDP);Call socket to create nested words, error detectionSOCKET ConnectSocket = INVALID_SOCKET;

) { -cout "Socket failed"Endl; the return-1; * } $ Panax NotoginsengSockaddr_in seraddr = {0}; -seraddr.sin_family =af_inet; theSeraddr.sin_port =htons (PORT); +Seraddr.sin_addr. S_un. S_ADDR = inet_addr ("127.0.0.1"); A theIresult = Connect (LSD, (SOCKADDR *) seraddr,sizeof(SERADDR)); + if(Iresult = =socket_error) { -cout "Connect Error"Endl; $ return-1; $ } - -Fopen_s (AMP;FP,"jj.jpg","wb+"); the if(fp = =NULL) { -cout "Crate File Error"Endl;Wuyi r

Delphi Winsock non-blocking mode detailed Winsockt the Tclientsocket setting of the ClientType property is ctnonblocking. The communication mode is non-blocking mode. Ctblocking is blocking mode, here are some differences between blocking and non-blocking. Ctblocking mode when the client requests the data, the thread blocks not to continue until the server returns the data, the client executes as needed, and reads the da

Socket is the basis of communication and the basic interface supporting network protocol data communication. Winsocket Provides some interesting I/O Model to facilitate applicationProgramOne "Asynchronous" method is used to manage the communication on one or more sockets at a time. These models include Select (Select ), Wsaasynselect (Asynchronous selection ), Wsaeventselect (Event Selection ), Overlapped I/O (Overlapping I/O ) And Completion port (Complete port ).

Winsock Protocol Code Actions () { Char actest [100]; Char actest2 [100]; Char * pctest3; // Generate the sending stringSprintf (actest, "kkkhhhh \ r \ n ";// Specify the sending stringLrs_set_send_buffer ("socket0", actest, strlen (actest ));// Send. The "buf0" parameter here is invalid because lrs_set_send_buffer is run before.Lrs_send ("socket0", "buf0", lrslastarg ); // Receives the returned stringLrs_receive ("socket0", "buf1", lrslasta

If you want to build a server application on Windows, you must consider the I/O model.Windows provides five I/O models: ■ Select );■ Asynchronous selection (WSAAsyncSelect );■ Event Selection (WSAEventSelect );■ Overlapping I/O (Overlapped I/O );■ Complete Port ). Each model is applicable to a specific application scenario. Programmers should have very clear requirements for their own applications,Make your choice based on factors such as program scalability and portability.===================