先收下改天必有用處
Server Code
/******************* SERVER CODE *****************/
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdlib.h>
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<nBytes-1;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 <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
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;
}
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