Example To C++ Sockets

Can somebody give me an example for C++ Sockets

Give this a look-through: it's pretty good

Here's something I wrote for a class a while back:


Client:

Code:

#include "userPanel.h"

int main (int argc, const char * argv[]) {
	if (argc < 3)
	{
		printf("Usage: userPanel [server] [port]\n--using: ");
		if (argc == 1)
		{
			printf("localhost 65530\n");
			ip = malloc(15*sizeof(char));
			ip = "127.0.0.1";
			port = (unsigned short) 65530;
		}
		if (argc == 2)
		{
			printf("%s 65530\n", argv[1]);
			ip = malloc(15*sizeof(char));
			strncpy(ip, argv[1], sizeof(ip));
			port = (unsigned short) 65530;
		}
	}
	else
	{
		port = (unsigned short) atoi(argv[2]);
		ip = malloc(15*sizeof(char));
		strncpy(ip, argv[1], sizeof(ip));
	}
	//server
	struct sockaddr_in calcserver;
	memset(&calcserver, 0, sizeof(calcserver));
	calcserver.sin_family = AF_INET;
	calcserver.sin_port = htons(port);
	calcserver.sin_addr.s_addr = inet_addr(ip);
	if(ip != NULL)
	{
		free(ip);
		ip = NULL;
	}
	for(;;)
	{
		//send to server
		printf("Calculation [float] [operation] [float]:");
		struct equation thisEquation;
		scanf("%f %s %f", &thisEquation.first, &thisEquation.operation, &thisEquation.second);
		printf("\n%f %s %f\n", thisEquation.first, thisEquation.operation, thisEquation.second);
		outsock = socket(AF_INET, SOCK_STREAM, 0);
		if (outsock == -1)
		{
			printf("Error creating socket\n");
			exit(-1);
		}
		if (connect(outsock, (struct sockaddr *)&calcserver, sizeof(calcserver)) < 0)
		{
			printf("Error Connecting to server\n");
			exit(-1);
		}
		send(outsock, &thisEquation, sizeof(thisEquation), 0);
		//recv from server
		listen(outsock, 1);
		recv(outsock, &result, sizeof(result), 0);
		printf("Solution: %f\n", result);
		close(outsock);
	}
	return 0;
}

Server:

Code:

#include "calculator.h"

int main (int argc, const char * argv[]) {
	if (argc < 2)
	{
		printf("Usage: calculator [port]\n--using: 65530\n");
		port = 65530;
	}
	else
		port = (unsigned short) atoi(argv[1]);
	
	memset(&serverAddr, 0, sizeof(serverAddr));
	memset(&clientAddr, 0, sizeof(clientAddr));
	serverAddr.sin_family = AF_INET;
	serverAddr.sin_port = htons(port);
	serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	serverSocket = socket(AF_INET, SOCK_STREAM, 0);
	//Bind
	if (bind(serverSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0)
	{
		printf("Error: bind()\nError Number:%d\n", errno);
		exit(-1);
	}
	if (listen(serverSocket, 5) < 0)
	{
		printf("Error: listen()\nError Number:%d\n", errno);
		exit(-1);
	}
	printf("Server ready!\n");
	for (;;)
	{
		unsigned int length = sizeof(clientAddr);
		clientSocket = accept(serverSocket, (struct sockaddr *) &clientAddr, &length);
		struct equation current;
		int bR = 0;
		bR = recv(clientSocket, &current, sizeof(current), 0);
		if(bR == -1)
			printf("\n%s\n", strerror(errno));
		printf("Client: %s\n", inet_ntoa(clientAddr.sin_addr));
		if (strcmp(current.operation, "plus") == 0)
			result = current.first + current.second;
		if (strcmp(current.operation, "minus") == 0)
			result = current.first - current.second;
		if (strcmp(current.operation, "mult") == 0)
			result = current.first * current.second;
		if (strcmp(current.operation, "div") == 0)
			result = current.first / current.second;
		if (strcmp(current.operation, "expon") == 0)
			result = pow(current.first, current.second);
		if (strcmp(current.operation, "log") == 0)
			result = log10(current.first) / log10(current.second);
		if (strcmp(current.operation, "sqrt") == 0)
			result = sqrt(current.first);
		printf("%f %s %f = %f\n", current.first, current.operation, current.second, result);
		send(clientSocket, &result, sizeof(result), 0);
		close(clientSocket);
	}
}

Here's a tutorial:

Linux Howtos: C/C++ -> Sockets Tutorial

It was the first result on Google for "C sockets"

(Note: C and C++ sockets are essentially the same)