شرح پروژه :یک پرسش و پاسخ بین client و server است. ابتدا کلاینت وسرور به یکدیگر سلام میدهند. وبعد کلاینت از سرور تقاضای کمک میکند.سرور میتواند قبول و یا رد کند. اگر تقاضا رد شود کلاینت پیغام thank you میدهد و ارتباط قطع میشود.در غیر این صورت شروع به پرسیدن سوالات از پیش تعریف شده از سرور میکند. و با پیغام thank you از طرف client برنامه به اتمام میرسد.نکته :برای برقراری ارتباط بین دو پروسه، حداقل نیاز است که یکی سرویس دهنده ( سرور ) و یکی سرویس گیرنده ( کاربر ) وجود باشد.
/****************** SERVER CODE ****************/
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
int welcomeSocket, newSocket;
char buffer[1024];
void answer ();
int main(){
struct sockaddr_in serverAddr;
struct sockaddr_storage serverStorage;
socklen_t addr_size;
/*---- Create the socket. The three arguments are: ----*/
/* 1) Internet domain 2) Stream socket 3) Default protocol (TCP in this case) */
welcomeSocket = socket(PF_INET, SOCK_STREAM, 0);
/*---- Configure settings of the server address struct ----*/
/* Address family = Internet */
serverAddr.sin_family = AF_INET;
/* Set port number, using htons function to use proper byte order */
serverAddr.sin_port = htons(7891);
/* Set IP address to localhost */
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
/* Set all bits of the padding field to 0 */
memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);
/*---- Bind the address struct to the socket ----*/
bind(welcomeSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr));
/*---- Listen on the socket, with 5 max connection requests queued ----*/
if(listen(welcomeSocket,5)==0)
printf("Listening\n");
else
printf("Error\n");
/*---- Accept call creates a new socket for the incoming connection ----*/
addr_size = sizeof serverStorage;
newSocket = accept(welcomeSocket, (struct sockaddr *) &serverStorage, &addr_size);
/*---- Read the message from the server into the buffer ----*/
recv(newSocket, buffer, 1024, 0);
/*---- Print the received message ----*/
printf("Data received: %s",buffer);
strcpy(buffer,"\0");
/*---- Send message to the socket of the incoming connection ----*/
strcpy(buffer,"Hello client\n");
sleep(1);
send(newSocket,buffer,13,0);
/*---- Read the message from the server into the buffer ----*/
recv(newSocket, buffer, 1024, 0);
/*---- Print the received message ----*/
printf("Data received: %s\n",buffer);
strcpy(buffer,"\0");
answer();
return 0;
}
void answer (){
scanf("%s",buffer);
send(newSocket,buffer,13,0);
char b[1024];
time_t t = time (NULL);
struct tm *tm = localtime(&t);
strcpy(b,asctime(tm));
char f=b[0];
while(1){
strcpy(buffer,"");
recv(newSocket, buffer, 1024, 0);
/*---- Print the received message ----*/
printf("Data received: %s\n",buffer);
if (strcmp(buffer,"thank you")==0){
close(newSocket);
printf("close");
sleep(2);
break;
}
else if(strcmp(buffer,"date and time?")==0){
strcpy(buffer,"\0");
time_t t = time (NULL);
struct tm *tm = localtime(&t);
strcpy(buffer,asctime(tm));
send(newSocket,buffer,90,0);
}
else if(strcmp(buffer,"what is the today?")==0){
strcpy(buffer,"\0");
if (f=='f'){
strcpy(buffer,"holiday\n");
send(newSocket,buffer,13,0);
}
else{
strcpy(buffer,"workday\n");
send(newSocket,buffer,13,0);
}
}
else if(strcmp(buffer,"what is the weather?")==0){
strcpy(buffer,"");
char *wea[5]={"rainy","sunny","foggy","cloudy","snowy"};
srand(time(0));
int r = rand()%5;
strcpy(buffer,wea[r]);
send(newSocket,buffer,13,0);
}
else{
strcpy(buffer,"");
strcpy(buffer,"the question, not found");
send(newSocket,buffer,25,0);
}
}
}
/****************** CLIENT CODE ****************/
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/unistd.h>
int main(){
int clientSocket;
char buffer[1024];
struct sockaddr_in serverAddr;
socklen_t addr_size;
/*---- Create the socket. The three arguments are: ----*/
/* 1) Internet domain 2) Stream socket 3) Default protocol (TCP in this case) */
clientSocket = socket(PF_INET, SOCK_STREAM, 0);
/*---- Configure settings of the server address struct ----*/
/* Address family = Internet */
serverAddr.sin_family = AF_INET;
/* Set port number, using htons function to use proper byte order */
serverAddr.sin_port = htons(7891);
/* Set IP address to localhost */
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
/* Set all bits of the padding field to 0 */
memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);
/*---- Connect the socket to the server using the address struct ----*/
addr_size = sizeof serverAddr;
connect(clientSocket, (struct sockaddr *) &serverAddr, addr_size);
/*---- Send message to the socket of the incoming connection ----*/
strcpy(buffer,"hello server\n");
send(clientSocket,buffer,13,0);
/*---- Read the message from the server into the buffer ----*/
recv(clientSocket,buffer, 1024, 0);
/*---- Print the received message ----*/
printf("Data received: %s\n",buffer);
strcpy(buffer,"");
/*---- Send message to the socket of the incoming connection ----need*/
strcpy(buffer,"i need some help and i have some question .can i ask them ?");
sleep(2);
send(clientSocket,buffer,80,0);
/*---- Read the message from the server into the buffer ----*/
recv(clientSocket, buffer, 1024, 0);
/*---- Print the received message ----*/
printf("Data received: %s\n",buffer);
char d=buffer[0];
strcpy(buffer,"");
if(d=='Y'||d=='y'){
while (1){
printf("what the question?\n");
strcpy(buffer,"");
/*---- Send message to the socket of the incoming connection ----date and time*/
gets(buffer);
send(clientSocket,buffer,30,0);
if (strcmp(buffer,"thank you")==0){close(clientSocket);break;}
/*---- Read the message from the server into the buffer ----*/
recv(clientSocket, buffer, 1024, 0);
/*---- Print the received message ----*/
printf("Data received: %s\n",buffer);
strcpy(buffer,"");
}//while 1
}//end of if d
else {
/*---- Send message to the socket of the incoming connection ----*/
strcpy(buffer,"thank you\n");
send(clientSocket,buffer,18,0);
close (clientSocket);
}
return 0;
}
در کد کلاینت نیز سوکتی ساخته شده و مانند کد سرور است.با تابع connect به server متصل میشویم . امیدوارم به کارتان بیاید.