c語言-windows gcc socket tcp

server.c
#include<winsock2.h>
#include<stdio.h>
int main() {
  SOCKET server_sockfd, client_sockfd;
  int server_len, client_len;
  struct sockaddr_in server_address;
  struct sockaddr_in client_address;

  // 註冊 Winsock DLL
  WSADATA wsadata;
  if(WSAStartup(0x101,(LPWSADATA)&wsadata) != 0) {
    printf("Winsock Error\n");
    exit(1);                                       
  }

  // 產生 server socket
  server_sockfd = socket(AF_INET, SOCK_STREAM, 0); // AF_INET(使用IPv4); SOCK_STREAM; 0(使用預設通訊協定，即TCP)
  if(server_sockfd == SOCKET_ERROR) {
    printf("Socket Error\n");
    exit(1);
  }

  // struct sockaddr_in {
  //     short int               sin_family; /* AF_INT(使用IPv4) */
  //     unsigned short int sin_port;    /* Port(埠號) */
  //     struct in_addr       sin_addr;   /* IP位址 */
  // };
  // sturct in_addr {
  //     unsigned long int s_addr;
  // };
  server_address.sin_family = AF_INET; // AF_INT(使用IPv4)
  server_address.sin_addr.s_addr = inet_addr("127.0.0.1"); // 設定IP位址
  server_address.sin_port = 9734; //設定埠號
  server_len = sizeof(server_address);
 
  if(bind(server_sockfd, (struct sockaddr *)&server_address, server_len) < 0) {
    printf("Bind Error\n");
    exit(1);
  }

  if(listen(server_sockfd, 5) < 0) {
    printf("Listen Error\n");
    exit(1);
  }

  while(1) {
    char ch;
    printf("Server waiting...\n");

    client_len = sizeof(client_address);

    client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &client_len);
    if(client_sockfd == SOCKET_ERROR) {
      printf("Accept Error\n");
      exit(1);
    }

    recv(client_sockfd, &ch, 1, 0); // Linux socket programming 為 read
printf("recv = %c\n", ch);
    ch++;
    send(client_sockfd, &ch, 1, 0); // Linux socket programming 為 write
//printf("send = %c\n", ch);
    closesocket(client_sockfd); // Linux socket programming 為 close
  }
}

client.c

#include<winsock2.h>

#include<stdio.h>

int main() {

  SOCKET sockfd;

  int len;

  struct sockaddr_in address;

  int result;

  char ch = 'F';

  //printf("char from server = %c\n", ch);

  WSADATA wsadata;

  if(WSAStartup(0x101,(LPWSADATA)&wsadata) != 0) {

    printf("Winsock Error\n"); 

    exit(1);

  }

  //printf("char from server = %c\n", ch);

  sockfd = socket(AF_INET, SOCK_STREAM, 0);

  address.sin_family = AF_INET;

  address.sin_addr.s_addr = inet_addr("127.0.0.1");

  address.sin_port = 9734;

  len = sizeof(address);

  //printf("char from server = %c\n", ch); 

  result = connect(sockfd, (struct sockaddr *)&address, len);  

  if(result == -1) {

    printf("Connetc Error");

    exit(1);

  }

  //printf("char from server = %c\n", ch); 

  send(sockfd, &ch, 1, 0);

  printf("send char from server = %c\n", ch);

  recv(sockfd, &ch, 1, 0);

  //printf("recv char from server = %c\n", ch);

  closesocket(sockfd);

  exit(0);

}