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问题描述
如何使用网络服务器端程序在服务器端打印Hello。
在客户端和服务器端编写程序。如果我们在客户端写你好，它必须在服务器端打印..
我已经完成了这样的程序
客户端
How would I print a "Hello" on server side using networking server side program.
Write a program in both client and server side. If we write hello in client side it must be print on server side..
I have done such program
Client Side
#include <stdio.h> /* for printf() and fprintf() */
#include <sys/socket.h> /* for socket(), connect(), sendto(), and recvfrom() */
#include <arpa/inet.h> /* for sockaddr_in and inet_addr() */
#include <stdlib.h> /* for atoi() and exit() */
#include <string.h> /* for memset() */
#include <unistd.h> /* for close() */
#define ECHOMAX 255 /* Longest string to echo */
void PrintError_exit(char *errorMessage); /* External error handling function */
int main(int argc, char *argv[])
{
int sock; /* Socket descriptor */
struct sockaddr_in echoServAddr; /* Echo server address */
struct sockaddr_in fromAddr; /* Source address of echo */
unsigned short echoServPort; /* Echo server port */
unsigned int fromSize; /* In-out of address size for recvfrom() */
char *servIP; /* IP address of server */
char *echoString; /* String to send to echo server */
char echoBuffer[ECHOMAX+1]; /* Buffer for receiving echoed string */
int echoStringLen; /* Length of string to echo */
int respStringLen; /* Length of received response */
if (argc != 4) /* Test for correct number of arguments */
{
fprintf(stderr,"Usage: %s <Server IP> <Echo Word> <Echo Port>\n", argv[0]);
exit(1);
}
servIP = argv[1]; /* First arg: server IP address (dotted quad) */
echoString = argv[2]; /* Second arg: string to echo */
echoStringLen = strlen(echoString); /* Calculate the length for later use */
echoServPort = atoi(argv[3]); /* Third Arg: Use given port, if any */
/* Create a datagram/UDP socket */
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
PrintError_exit("socket() failed");
/* Construct the server address structure */
memset(&echoServAddr, 0, sizeof(echoServAddr)); /* Zero out structure */
echoServAddr.sin_family = AF_INET; /* Internet addr family */
echoServAddr.sin_addr.s_addr = inet_addr(servIP); /* Server IP address */
echoServAddr.sin_port = htons(echoServPort); /* Server port */
/* Send the string to the server */
if (sendto(sock, echoString, echoStringLen, 0, (struct sockaddr *)
&echoServAddr, sizeof(echoServAddr)) != echoStringLen)
PrintError_exit("sendto() sent a different number of bytes than expected");
/* Recv a response */
fromSize = sizeof(fromAddr);
if ((respStringLen = recvfrom(sock, echoBuffer, ECHOMAX, 0,
(struct sockaddr *) &fromAddr, &fromSize)) != echoStringLen)
PrintError_exit("recvfrom() failed");
/* null-terminate the received data */
echoBuffer[respStringLen] = '\0';
printf("Received: %s\n", echoBuffer); /* Print the echoed arg */
close(sock);
exit(0);
}
void PrintError_exit(char *errorMsg) /* External error handling function */
{
fprintf(stderr,"Error:%s\n",errorMsg);
exit(0);
}
服务器端
Server Side
#include <stdio.h> /* for printf() and fprintf() */
#include <sys/socket.h> /* for socket() and bind() */
#include <arpa/inet.h> /* for sockaddr_in and inet_ntoa() */
#include <stdlib.h> /* for atoi() and exit() */
#include <string.h> /* for memset() */
#include <unistd.h> /* for close() */
#define ECHOMAX 255 /* Longest string to echo */
void PrintError_exit(char *); /* External error handling function */
int main(int argc, char *argv[])
{
int sock; /* Socket */
struct sockaddr_in echoServAddr; /* Local address */
struct sockaddr_in echoClntAddr; /* Client address */
unsigned int cliAddrLen; /* Length of incoming message */
char echoBuffer[ECHOMAX]; /* Buffer for echo string */
unsigned short echoServPort; /* Server port */
int recvMsgSize; /* Size of received message */
if (argc != 2) /* Test for correct number of parameters */
{
fprintf(stderr,"Usage: %s <UDP SERVER PORT>\n", argv[0]);
exit(1);
}
echoServPort = atoi(argv[1]); /* First arg: local port */
/* Create socket for sending/receiving datagrams */
// if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
sock = socket(AF_INET, SOCK_DGRAM,IPPROTO_UDP);
if (sock < 0)
PrintError_exit("socket() failed");
else
printf("Socket Created Successfully");
/* Construct local address structure */
memset(&echoServAddr, 0, sizeof(echoServAddr)); /* Zero out structure */
echoServAddr.sin_family = AF_INET; /* Internet address family */
echoServAddr.sin_addr.s_addr = htonl(INADDR_ANY); /* Any incoming interface */
echoServAddr.sin_port = htons(echoServPort); /* Local port */
/* Bind to the local address */
if (bind(sock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) < 0)
PrintError_exit("bind() failed");
for (;;) /* Run forever */
{
/* Set the size of the in-out parameter */
cliAddrLen = sizeof(echoClntAddr);
/* Block until receive message from a client */
if ((recvMsgSize = recvfrom(sock, echoBuffer, ECHOMAX, 0,
(struct sockaddr *) &echoClntAddr, &cliAddrLen)) < 0)
PrintError_exit("recvfrom() failed");
/* Know the IP address of the client, from where the request is originated */
printf("Handling client %s\n", inet_ntoa(echoClntAddr.sin_addr));
/* Received data from client */
echoBuffer[recvMsgSize]='\0';
printf("Data received %s \n", echoBuffer);
/* Send received datagram back to the client */
if (sendto(sock, echoBuffer, recvMsgSize, 0,
(struct sockaddr *) &echoClntAddr, sizeof(echoClntAddr)) != recvMsgSize)
PrintError_exit("sendto() sent a different number of bytes than expected");
}
/* NOT REACHED */
}
void PrintError_exit(char *errorMsg) /* External error handling function */
{
fprintf(stderr,"Error:%s\n",errorMsg);
exit(0);
}推荐答案
printf("Hello");
Now you have added some code it seems this is a C program, but it is no more clear what your problem is.
Now you have added some code it seems this is a C program, but it is no more clear what your problem is.
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