wmaker/WINGs/Examples/connect.c

/*
 *  WINGs connect.c: example how to create a network client using WMConnection
 *
 *  Copyright (c) 1999-2003 Dan Pascu
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include <WINGs/WINGs.h>

static int initialized = 0;

static void didReceiveInput(ConnectionDelegate * self, WMConnection * cPtr);

static void connectionDidDie(ConnectionDelegate * self, WMConnection * cPtr);

static void didInitialize(ConnectionDelegate * self, WMConnection * cPtr);

static ConnectionDelegate socketDelegate = {
	NULL,			/* data */
	NULL,			/* canResumeSending */
	NULL,			/* didCatchException */
	connectionDidDie,	/* didDie */
	didInitialize,		/* didInitialize */
	didReceiveInput,	/* didReceiveInput */
	NULL			/* didTimeout */
};

void wAbort(Bool foo)
{
	exit(1);
}

static char *getMessage(WMConnection * cPtr)
{
	char *buffer;
	WMData *aData;
	int length;

	aData = WMGetConnectionAvailableData(cPtr);
	if (!aData)
		return NULL;
	if ((length = WMGetDataLength(aData)) == 0) {
		WMReleaseData(aData);
		return NULL;
	}

	buffer = (char *)wmalloc(length + 1);
	WMGetDataBytes(aData, buffer);
	buffer[length] = '\0';
	WMReleaseData(aData);

	return buffer;
}

static void inputHandler(int fd, int mask, void *clientData)
{
	WMConnection *cPtr = (WMConnection *) clientData;
	WMData *aData;
	char buf[4096];
	int n;

	if (!initialized)
		return;

	n = read(fd, buf, 4096);
	if (n > 0) {
		aData = WMCreateDataWithBytes(buf, n);
		WMSendConnectionData(cPtr, aData);
		WMReleaseData(aData);
	}
}

static void didReceiveInput(ConnectionDelegate * self, WMConnection * cPtr)
{
	char *buffer;

	buffer = getMessage(cPtr);
	if (!buffer) {
		fprintf(stderr, "Connection closed by peer.\n");
		exit(0);
	}

	printf("%s", buffer);

	wfree(buffer);
}

static void connectionDidDie(ConnectionDelegate * self, WMConnection * cPtr)
{
	WMCloseConnection(cPtr);

	fprintf(stderr, "Connection closed by peer.\n");
	exit(0);
}

static void didInitialize(ConnectionDelegate * self, WMConnection * cPtr)
{
	int state = WMGetConnectionState(cPtr);
	WMHost *host;

	if (state == WCConnected) {
		host = WMGetHostWithAddress(WMGetConnectionAddress(cPtr));
		fprintf(stderr, "connected to '%s:%s'\n",
			host ? WMGetHostName(host) : WMGetConnectionAddress(cPtr), WMGetConnectionService(cPtr));
		initialized = 1;
		if (host)
			WMReleaseHost(host);
		return;
	} else {
		wsyserrorwithcode(WCErrorCode, "Unable to connect");
		exit(1);
	}
}

int main(int argc, char **argv)
{
	char *ProgName, *host, *port;
	int i;
	WMConnection *sPtr;

	wsetabort(wAbort);

	WMInitializeApplication("connect", &argc, argv);

	ProgName = strrchr(argv[0], '/');
	if (!ProgName)
		ProgName = argv[0];
	else
		ProgName++;

	host = NULL;
	port = "34567";

	if (argc > 1) {
		for (i = 1; i < argc; i++) {
			if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) {
				printf("usage: %s [host [port]]\n\n", ProgName);
				exit(0);
			} else {
				if (!host)
					host = argv[i];
				else
					port = argv[i];
			}
		}
	}

	printf("Trying to make connection to '%s:%s'\n", host ? host : "localhost", port);

	sPtr = WMCreateConnectionToAddressAndNotify(host, port, NULL);
	if (!sPtr) {
		wfatal("could not create connection. exiting");
		exit(1);
	}

	WMSetConnectionDelegate(sPtr, &socketDelegate);

	/* watch what user types and send it over the connection */
	WMAddInputHandler(0, WIReadMask, inputHandler, sPtr);

	while (1) {
		WHandleEvents();
	}

	return 0;

}