Created
December 2, 2012 00:35
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Client Socket Example
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#include <stdio.h> | |
#include <sys/types.h> | |
#include <sys/socket.h> | |
#include <netinet/in.h> | |
#include <netdb.h> | |
#include <stdlib.h> | |
#include <string.h> | |
// error handling | |
void error(char *msg) | |
{ | |
perror(msg); | |
exit(0); | |
} | |
void ReadMessage(int socket,char * buffer) { | |
int i,n; | |
n = recv(socket,buffer,256,MSG_PEEK); | |
for(i=0;i<256;i++){ | |
if(strcmp(&buffer[i],"\0") == 0) break; | |
} | |
n = recv(socket,buffer,i+1,0); | |
if (n < 0) | |
error("ERROR reading from socket"); | |
//printf("ReadMessage:%s %d\n",buffer,n); | |
} | |
// setup client socket connection | |
int ClientSocket(int argc, char** argv) | |
{ | |
int sockfd; | |
int portno; | |
struct sockaddr_in serv_addr; | |
struct hostent *server; | |
// setup client socket connection | |
if (argc < 3) { | |
fprintf(stderr,"usage: %s hostname port\n", argv[0]); | |
exit(0); | |
} | |
// server name | |
server = gethostbyname("128.173.223.206"/*argv[1]*/); | |
if (server == NULL) { | |
fprintf(stderr,"ERROR, no such host\n"); | |
exit(0); | |
} | |
// port no. | |
portno = 5040;//atoi(argv[2]); | |
// socket file descriptor | |
sockfd = socket(AF_INET, SOCK_STREAM, 0); | |
if (sockfd < 0) | |
error("ERROR opening socket"); | |
// initiate struct socketaddr_in | |
bzero((char *) &serv_addr, sizeof(serv_addr)); | |
serv_addr.sin_family = AF_INET; | |
serv_addr.sin_port = htons(portno); | |
bcopy((char *)server->h_addr, | |
(char *)&serv_addr.sin_addr.s_addr, | |
server->h_length); | |
// cast sockaddr_in to sockaddr | |
if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0) | |
error("ERROR connecting"); | |
return sockfd; | |
} | |
int SendMessage(int socketfd, char *message) | |
{ | |
int n; | |
strcat(message, "\0000"); | |
// Write message back to client | |
//n = write(socketfd,message,(strlen(message)+1)); | |
n = send(socketfd,message,(strlen(message)+1),0); | |
if (n<0) | |
error("Error sending to server\n"); | |
else if(n == 0) | |
printf("Server closed the socket.\n"); | |
return n; | |
} | |
// main client socket | |
int main(int argc, char *argv[]) | |
{ | |
char buffer[256]; | |
// setup client socket connection | |
int sockfd; | |
sockfd = ClientSocket(argc, argv); | |
buffer[0] = 'H'; | |
buffer[1] = 'E'; | |
buffer[2] = 'L'; | |
buffer[3] = 'L'; | |
buffer[4] = 'O'; | |
SendMessage(sockfd, buffer); | |
while(1){ | |
printf("Please enter the message: "); | |
bzero(buffer,256); | |
fgets(buffer,255,stdin); | |
SendMessage(sockfd, buffer); | |
} | |
return 0; | |
} |
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