[C語言] 一組socket server client send string的程式範例

這組code是從http://www.programminglogic.com/sockets-programmin...擷錄

Server Code

/******************* SERVER CODE *****************/

#include

#include

#include

#include

#include

int main(){

  int welcomeSocket, newSocket, portNum, clientLen, nBytes;

  char buffer[1024];

  struct sockaddr_in serverAddr;

  struct sockaddr_storage serverStorage;

  socklen_t addr_size;

  int i;

  welcomeSocket = socket(PF_INET, SOCK_STREAM, 0);

  portNum = 7891;

  

  serverAddr.sin_family = AF_INET;

  serverAddr.sin_port = htons(portNum);

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

  memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);  

  bind(welcomeSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr));

  if(listen(welcomeSocket,5)==0)

    printf("Listening\n");

  else

    printf("Error\n");

  addr_size = sizeof serverStorage;

  /*loop to keep accepting new connections*/

  while(1){

    newSocket = accept(welcomeSocket, (struct sockaddr *) &serverStorage, &addr_size);

    /*fork a child process to handle the new connection*/

    if(!fork()){

      nBytes = 1;

      /*loop while connection is live*/

      while(nBytes!=0){

        nBytes = recv(newSocket,buffer,1024,0);

  

        for (i=0;i

          buffer[i] = toupper(buffer[i]);

        }

        send(newSocket,buffer,nBytes,0);

      }

      close(newSocket);

      exit(0);

    }

    /*if parent, close the socket and go back to listening new requests*/

    else{

      close(newSocket);

    }

  }

  return 0;

}

Client Code

/******************* CLIENT CODE *****************/

#include

#include

#include

#include

int main(){

  int clientSocket, portNum, nBytes;

  char buffer[1024];

  struct sockaddr_in serverAddr;

  socklen_t addr_size;

  clientSocket = socket(PF_INET, SOCK_STREAM, 0);

  portNum = 7891;

  serverAddr.sin_family = AF_INET;

  serverAddr.sin_port = htons(portNum);

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

  memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);  

  addr_size = sizeof serverAddr;

  connect(clientSocket, (struct sockaddr *) &serverAddr, addr_size);

  while(1){

    printf("Type a sentence to send to server:\n");

    fgets(buffer,1024,stdin);

    printf("You typed: %s",buffer);

    nBytes = strlen(buffer) + 1;

    send(clientSocket,buffer,nBytes,0);

    recv(clientSocket, buffer, 1024, 0);

    printf("Received from server: %s\n\n",buffer);   

  }

  return 0;

}