winsock dll

The most basic Winsock program. It should have been saved as the Wiki part of the Blog Code, rather than a blog. The self-built blog program has no signs of delay, so I can't help it. The two files complete the simplest Winsock example: the server listens, the client initiates a connection, sends data, and the server sends feedback after receiving the data. The following is the client code file: // Clientp

Winsock error code list 2004-05-27 Sckoutofmemory 7 out of memoryThe value of sckinvalidpropertyvalue 380 is invalid.The sckgetnotsupported 394 attribute is not readable.The sckgetnotsupported 383 attribute is read-only.Sckbadstate 40006 the transaction requested or the error protocol or error connection status of the request itselfThe format of the parameter passed to the function by sckinvalidarg 40014 is u

# Include # Include Int main (INT argc, char ** argv){Wsadata;Char hostname [256];Hostent * hostent;Protoent * protoent;In_addr ** ADDR;Char * ipaddr;Socket socket;Sockaddr_in sin;Socket acceptsocket;// Initialize WinsockIf (wsastartup (makeword (2, 2), wsadata )){Printf ("init Winsock failed! \ N ");Return 1;} // Obtain the Host NameGethostname (hostname, 256 );Printf ("% s \ n", hostname ); // Obtain host informationHostent = gethostbyname (

the call, since the non-lock call will frequently return the wsaewouldblock error, the programmer needs to constantly check when the function returns code half a socket for read/write, in order to avoid the trouble, Winsock provides several different Socket I/O models to manage I/O. Including select, wsaeasyncselect, wsaeventselect, overlapped, and completion)The select model is used to prevent locking in the socket in blocking mode and prevent repea

; // specify the waiting time in secondsLong TV _usec; // The specified wait time in milliseconds} Timeval;Before using select to listen to a socket, the application must allocate the socket handle to a set and set one or all the read, write, and exceptionFd_set structure. Assign a socket to any set and then call select to check whether I/O activity is ongoing on a socket. Winsock provides several macros to process fd_set:Fd_zero (* Set) // clear fd_s

Original Address:MinGW QTSun 1 EastProblems and workarounds for compiling QT source code using MinGW without using the QT SDK:Configure-fast-release-no-exceptions-no-rtti-no-stl-no-qt3support-no-opengl-no-multimedia-no-webkit-no-script- No-scripttools-nomake tools-nomake examples-nomake demos-nomake docs-nomake translations-platform win32-g++The TDM version of MinGW GCC is highly recommended, compared to the official MinGW slow and obscure, the TDM installation process is simple, clear, and fast

. Label Label1Caption = "smtp server"Height = 375Left = 1, 360TabIndex = 0Maximum = 120Width = 1335EndEndAttribute VB_Name = "Form1"Attribute VB_GlobalNameSpace = FalseAttribute VB_Creatable = FalseAttribute VB_PredeclaredId = TrueAttribute VB_Exposed = FalsePrivate Declare Function socket Lib "wsock32.dll" (ByVal af As Long, ByVal s_type As Long, ByVal protocal As Long) As LongPrivate Const AF_INET = 2Private Const SOCK_STREAM = 1Private Declare Func

ExploitationWinsock programming is implemented in synchronous and asynchronous modes with clear logic and focus on applications. In the preemptive multi-task operating system (WinNt and Win2K) the efficiency of using multi-thread mode basically reaches the level of asynchronous mode. The following are the main points of Synchronous Programming. 　　1. fast communication 　　The Nagle algorithm of Winsock reduces the transmission speed of small dat

the event object that occurs. A socket can be associated with one, two, or more event objects, while the event object maintains a one by one relationship with the overlapping structure. When an application manages this relational table, it can have serious consequences if a little omission occurs. Completion Port Benefits: The completion port is actually a notification queue. When an I/O operation completes, the notification package is sent by the operating system to the complet

In front of us, we talked about the WSAAsyncSelect model, which provides a mechanism compared to the Select model: when the corresponding IO notification occurs, the operating system is notified immediately, and the corresponding handler function is called, which solves the timing problem of calling send and recv. But it has one obvious drawback, that it has to rely on Windows. Another model is provided for this Winsock WSAEventSelectIntroduction to t

#include 　　Winsock implements HTTP Get/post

Recording Using the Winsock protocol will slow the response time during playback. This is mainly because the content received by recv_buff during recording is inconsistent with that during playback. The system will automatically check the content. Solution: Add a function in the program: lrs_set_recv_timeout2 (), so that the system does not check whether the recycled content is consistent. Two functions are introduced: 1. lrs_set_recv_timeout (SEC,

Winsock provides a very useful asynchronous I/O model. With this model, applications can connectReceives network event notifications Based on Windows messages. This model first appeared in Winsock.In Version 1.1Help developers to design for some early 16-bit Windows platforms. However, the current application can stillEven the csocket class in MFC adopts this model. Because the model is based on the Windows message mechanism, to use this model, you mu

1. server code A) initialize the Winsock library and add it to server. cpp. Wsadata; Word sockversion = makeword (2, 0);: wsastartup (sockversion, wsadata); cserverdlg DLG; m_pmainwnd = DLG; int_ptr nresponse = DLG. domodal (); If (nresponse = idok) {// todo: Click here to close the dialog box code when to use // "OK} B) Create a server-side listener socket Void cserverdlg: onbnclickedbutton1 () {m_ip.resetcontent (); m_list.resetcontent (); // to

the narrow band width is expanded to a wide band by hundreds of times through the spectrum extension technology, this reduces the potential impact of interference. Compared with other systems that work in the same frequency band, Bluetooth provides faster frequency hopping and shorter data packets, making Bluetooth more stable than other systems. The use of FEC (forward error correction, forward correction) suppresses random noise on long-distance links. The frequency-hopping transceiver using

(Reprinted) socket: 10038 error {A winSock bug: it may cause problems when closesocket is used for multiple errors}, 10038 closesocket In the past few days, I want to modify an open source code to develop a product.The program was originally a single-Thread Network Program and needs to be modified to multiple threads. After the modification, there is always a problem. The recv function in the auxiliary thread always receives a datagram with a length o

select () function does not set the timeout time, the newly added socket will never be processed. What I can think of is that when a main thread creates a business thread, a socket is associated with each business thread, called an event socket. The business is now in select () the employee detected the socket event. in this way, after the master thread accept () reaches a new connection, it writes the event socket of a thread, which can wake up the business thread in time. In general,

To use Winsock for programming, you must first include the winsock2.h header file. The wsastartup function loads the sock function library.Int wsastartup (version, wsadata );If 0 is returned, the data is successfully loaded. The version can be 0x101 or 0x202, and wsadata is of the wsadata type. Wsacleanup (); uninstall the function library. The sockaddr_in structure is the socket address in TCP/IP communication.Mainly includeSockaddr_in.sin_fami

The select model is the most common I/O model in Winsock. The core is to use the select function to manage I/O! The select function is used to determine whether data on a socket is readable or whether data can be written to a socket to prevent the program from being in blocking mode, during an I/O call (such as send, Recv, and accept), the system is forced to enter the "locked" State. It also prevents wsaewouldblock errors when the socket is in non-bl

* local_if){Struct ip_mreq mreq;Memcpy ( (mreq. imr_interface), local_if, sizeof (struct in_addr); // local ifMemcpy ( (mreq. imr_multiaddr), local_if, sizeof (struct in_addr); // mutilcast group addressReturn (setsockopt (S, ipproto_ip, ip_drop_membership, (char *) mreq, sizeof (mreq )));} Next, we will use this multicast library to write the receiver program first. Of course, you can also modify the code so that it can send data. # Pragma comment (Lib, "ws2_32.lib ")# Include # Include "mcas