Thread: Error in creating socket in a client (UDP)

Ok, thanks in advice for your help! I'm creating two new programs: a client and a server: they have to exchange shot msgs, with UDP.

But my client doesn't succeed in creating the socket:

Code:

#if defined WIN32
#include <winsock.h>
#else
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#endif
#include <stdio.h>
#include <string.h>

#define MAX 100

void printErr(char *message) {
	fprintf(stdout, message); }

void ClearWinSock() {
#if defined WIN32
	WSACleanup();
#endif
}

int main (void) {

	int sock;
	struct sockaddr_in echoServAddr;
	struct sockaddr_in fromAddr;
	unsigned short echoServPort;
	unsigned int fromSize;
	char *servIP;
	char echoString[MAX];
	char echoBuffer[MAX];
	int echoStringLen, respStringLen;


		servIP = "127.0.0.1";

		do {

			fprintf(stdout, "\nInput:\n");
			fscanf(stdin, "%s" ,echoString);
			fprintf(stdout, "%s", echoString);

			} while (strlen(echoString) > MAX);

		echoStringLen = strlen(echoString);

		echoServPort = 23477;

               /* this fails*/
		if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
			{ printErr("\nSocket() creation failed."); }

		memset(&echoServAddr, 0, sizeof(echoServAddr));
		memset(&echoBuffer, 0, sizeof(echoBuffer));
		echoServAddr.sin_family = AF_INET;
		echoServAddr.sin_port = htons(echoServPort);
		echoServAddr.sin_addr.s_addr = inet_addr(servIP);

		if (sendto(sock, echoString, echoStringLen, 0,
				(struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) != echoStringLen)
			{ printErr("\nsendto() error."); }

		fromSize = sizeof(fromAddr);

		if ((respStringLen = recvfrom(sock, echoBuffer, MAX, 0,
				(struct sockaddr *) &fromAddr, &fromSize)) != echoStringLen)
			{ printErr("\nrecvfrom() error."); }


		fprintf(stdout, "\nString received = %s", echoBuffer);


		closesocket(sock);
		#if defined WIN32
			WSACleanup();
			fprintf(stdout, "\n");
			system("pause");
		#endif
		return EXIT_SUCCESS;

}

And I don't know why. Can you help?

PS: I use Eclipse on Windows...