Linux-to-Windows program porting for network programming in Windows

1) To prevent redefinition, the header file inclusion sequence in Windows code is as follows:

# Include <winsock2.h>
# Define win32_lean_and_mean
# Include <windows. h>

Reference: http://blog.sina.com.cn/s/blog_658d267b0100jb2l.html

// ================================================ ================================================== ========================

2) sockaddr

Windows:

struct sockaddr {    unsigned short    sa_family;    // address family, AF_xxx    char              sa_data[14];  // 14 bytes of protocol address};

Linux:

Struct sockaddr {

Unsigned short

Sa_family;/* address family, af_xxx */

Char sa_data [14];/* 14-byte Protocol address */

};

Sa_family is generally af_inet, which represents the Internet (TCP/IP) address family. sa_data contains the IP address and port number of the socket.

3) sockaddr_in

Windows:

struct sockaddr_in {    short            sin_family;   // e.g. AF_INET, AF_INET6    unsigned short   sin_port;     // e.g. htons(3490)    struct in_addr   sin_addr;     // see struct in_addr, below    char             sin_zero[8];  // zero this if you want to};

Linux:

Struct sockaddr_in {

Short int sin_family;/* address family */

Unsigned short int sin_port;/* Port Number */

Struct in_addr sin_addr;/* IP Address */

Unsigned char sin_zero [8];/* fill in 0 to keep the same size as struct sockaddr */

};

This structure is more convenient to use. Sin_zero is used to fill the sockaddr_in structure with the same length as struct sockaddr. It can be set to zero using the bzero () or memset () function.

The pointer to sockaddr_in and the pointer to sockaddr can be converted to each other, which means that if the parameter type required by a function is sockaddr, you can call

Converts a pointer to sockaddr_in to a pointer to sockaddr, or vice versa.

// ================================================ ================================================== ========================

4) socket ()

Linux:

Int socket (int af, int type, int Protocol );

Windows:

Socket socket (int af, int type, int Protocol); // here Windows and Linux are the same, socket type is int type (16-bit unsigned integer)
5) bind ()

Linux:

Int BIND (intSockfd, Struct sockaddr *My_addr, Socklen_tAddrlen); 

Windows:

Int BIND (socketSockfd, Struct sockaddr *My_addr, IntAddrlen);// Socket_len is of the int type. ------ I'm not sure about it here. It's true !!

6) recvfrom ()

Windows:

Int recvfrom (socket sockfd, char * Buf, int Len, int flags, struct sockaddr * From, int * fromlen );

Linux:

Int recvfrom (INT sockfd, void * Buf, int Len, unsigned int flags, struct sockaddr * From, socket_t * fromlen );

7) sendto ()

Windows:

Int sendto (socket S, const char * MSG, int Len, int flags, const struct sockaddr * To, int tolen );

Linux:

Int sendto (int s, const void * MSG, int Len, int flags, struct sockaddr * To, socklen_t tolen );

8) Select ()

Linux:

Windows:

9) addinfo

Windows:

typedef struct addrinfo {  int             ai_flags;  int             ai_family;  int             ai_socktype;  int             ai_protocol;  size_t          ai_addrlen;  char            *ai_canonname;  struct sockaddr  *ai_addr;  struct addrinfo  *ai_next;} ADDRINFOA, *PADDRINFOA;

Linux:

Struct addrinfo {int ai_flags; int ai_family; int ai_socktype; int ai_protocol; size_t ai_addrlen; struct sockaddr * ai_addr; char * ai_canonname; // differences !!! Struct addrinfo * ai_next ;};