【网络编程】——windows socket 编程

测试demo

 #include <winsock2.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #if 0
 #define TCP
 #else
 #define UDP
 #endif

 #pragma comment(lib, "ws2_32.lib")
 char *ip = "10.8.2.60";
 #ifdef UDP
 short port = ;
 #endif
 #ifdef TCP
 short port = ;
 #endif
 SOCKET fd;

 int init(void) {
     WSADATA wsaData;
     int nRet;
     if((nRet = WSAStartup(MAKEWORD(,),&wsaData)) != ){
         printf("WSAStartup failed!\n");
         exit();
     }
 }

 int init_socket(void){
     SOCKADDR_IN local;
 #ifdef UDP
     if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -){
 #endif
 #ifdef TCP
     if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -){
 #endif
         printf("%d\n", WSAGetLastError());
         perror("socket");
         //getchar();
         return -;
     }

     printf("fd:%d start......\n", fd);

     local.sin_family = AF_INET;
     local.sin_port = htons((short)port);
     local.sin_addr.s_addr = inet_addr(ip);
     //local.sin_addr.S_un.S_addr = inet_addr(ip);

     if (bind(fd, (SOCKADDR *)&local, sizeof(local)) == SOCKET_ERROR) {
         printf("reason %d ", WSAGetLastError());
         printf("bind failed!\n");
         getchar();
         return -;
     }

 #ifdef TCP
     if (listen(fd, ) == -){
         perror("listen");
         return -;
     }
 #endif
     return ;
 }

 int main(int argc, char *argv[]) {
     char buffer[];
     int size;
     SOCKADDR_IN from;
     int addrlen = sizeof(from);
     SOCKET client;
     unsigned int index = ;

     init();
     if (init_socket()) {
         //printf("init socket error!\n");
         return -;
     }

     while (){
         index++;
 #ifdef UDP
         size = recvfrom(fd, buffer, sizeof(buffer), , NULL, NULL);
         printf("recvfrom:%d index:%u\n", size, index);
 #endif
 #ifdef TCP
         if ((client = accept(fd, (SOCKADDR *)&from, &addrlen)) == -){
             perror("accept");
             return -;
         }
         size = recv(client, buffer, sizeof(buffer), );
         printf("recv:%d\n", size);
 #endif
     }

     getchar();
     return ;
 }

以上是 server 端，一下是 client 端：

 #include <winsock2.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>

 #if 0
 #define UDP
 #else
 #define TCP
 #endif

 #pragma comment(lib, "ws2_32.lib")
 char *ip = "10.8.2.56";

 #ifdef UDP
 short port = ;
 #else
 short port = ;
 #endif

 SOCKET fd;

 int init(void) {
     WSADATA wsaData;
     int nRet;
     if((nRet = WSAStartup(MAKEWORD(,),&wsaData)) != ){
         printf("WSAStartup failed!\n");
         exit();
     }
 }

 int init_socket(void){

 #ifdef UDP
     if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -){
 #else
     SOCKADDR_IN local;
     if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -){
 #endif
         printf("%d\n", WSAGetLastError());
         perror("socket");
         //getchar();
         return -;
     }

 #ifdef TCP

     local.sin_family = AF_INET;
     local.sin_port = htons(port);
     local.sin_addr.S_un.S_addr = inet_addr(ip);

     if (connect(fd, (SOCKADDR *)&local, sizeof(local)) == SOCKET_ERROR) {
         printf("connect error!\n");
         perror("connect");
         return -;
     }
 #endif
     printf("fd:%d start......\n", fd);

     return ;
 }

 int main(int argc, char *argv[]) {
     char buffer[];
     int size;
     int result = ;
     unsigned int index = ;

     init();

     if (init_socket()){
         return -;
     }

 #ifdef UDP
     SOCKADDR_IN sin;
     int addrlen = sizeof(sin);
     sin.sin_family = AF_INET;
     sin.sin_port = htons(port);
     sin.sin_addr.s_addr = inet_addr(ip);
 #endif

     memset(buffer, , sizeof(buffer));
     while () {
 #ifdef UDP
         result = sendto(fd, buffer, sizeof(buffer), , (SOCKADDR *)&sin, addrlen);
 #else
         result = send(fd, buffer, sizeof(buffer), );
 #endif
         printf("result:%d, index:%d\n", result, index);
         getchar();
         index++;
     }

     return ;
 }