Common socket APIs in Windows

1. Winsock DLL

1. initialize Winsock DLL

Int wsastartup (

Word wversionrequested, // The maximum version supported by Windows Socket that the caller can use. Specifies the secondary version at the High Level and the primary version number at the low level.

Lpwsadata // pointer to wsadata, used to receive Implementation Details of Windows Socket

);

// This function initializes the use of ws2_32.dll in a process.

2. Release Winsock DLL Resources

Int wsacleanup (void );

 

Ii. Socket

1. Create a socket

Socket socket (

Int AF, // address family description

Int type, // description of the new socket type

Int protocol // specifies the SOCKET protocol, which is specific to the address family. 0 indicates the default protocol.

);

2. Close the socket with ease

Int Shutdown (

Socket S, // socket Descriptor

Int how // a flag indicating which operation type is not allowed

);

3. Disable socket

Int closesocket (

Socket s

);

 

Iii. Server Side

1. Bind

Int BIND (

Socket S, // a descriptor with no socket bound;

Const struct sockadd * Name, // allocate the socket address from the sockaddr Structure

The length of the int namelen // name in bytes.

);

2. Listening

Int listen (

Socket S, // indicates a socket bound but not connected

Int backlog // Maximum length of the queue to be connected

);

The listen function places the socket in the listening status and waits for the connection to enter.

3. Receive

Socket accept (

Socket S, // a socket descriptor that uses the listen function to place the listener status. The socket returned by the accept function is actually a connection.

Struct sockaddr * ADDR, // optional pointer, pointing to the buffer used to receive connected entities

Int * addrlen // an optional pointer pointing to an integer containing the length of ADDR

);

// The accept function allows a socket to accept client connections.

 

 

Iv. Client

1. Create a connection

Int connect (

Socket S, // calibrate an unbound socket Descriptor

Const struct sockaddr * Name, // name of the socket with which the connection should be established

Int namelen // Name Length

);

// Connect function creates a link to the specified socket

 

5. Data Transmission

1. Send data

Int send (

Socket S, // identifies a descriptor that has established a connection socket

Const char * Buf, // buffer that contains the data to be transmitted

Int Len, // The length of data in Buf

Int flags // The indicator that specifies the invocation method.

);

// The send function sends data on a socket with established connections.

2. send data

Int sendto (

Socket S, // indicates a mark that may have been connected

Const char * Buf,

Int Len,

Int flags,

Const struct sockaddr * To, // an optional pointer pointing to the address of the target socket

Int tolen

);

3. receive data

Int Recv (

Socket S, // identifies a descriptor that has established a connection socket

Char * Buf,

Int Len,

Int flags

);

// The resv function receives data from a connected or bound socket.

4. receive data from

Int recvfrom (

Socket s,

Char * Buf, // buffer for receiving incoming data

Int Len,

Int flags,

Struct sockaddr * From, // an optional pointer pointing to a buffer that saves the source address when returning

Int * fromlen

);

 

Vi. socket address information

1. Obtain the socket address of the other party

Int getpeername (

Socket s,

Struct sockaddr * Name,

Int * namelen

);

// The getpeername function gets the name of the computer connected to a socket.

2. obtain local socket address information

Int getsockname (

Socket S, // identifies the descriptor of a connected socket
Struct sockaddr far * Name, // used to obtain the local socket socketaddr Structure

Int far * namlen // point to the name structure size, in bytes

);

// Getsockname function to obtain the local socket name

 

VII. Miscellaneous

1. Get the latest error code

Int wsagetlasterror (void );