// TCPClient.cpp 
// A simple example for TCP client

#include <stdio.h>
#include <Winsock2.h>

#define PORTNUM 50000 /* random port number, we need something */


int main(int argc, char* argv[])
{ 
	WORD wVersionRequested;
	WSADATA wsaData;
	int err;
 
	wVersionRequested = MAKEWORD( 2, 2 );
 
	err = WSAStartup( wVersionRequested, &wsaData );
	if ( err != 0 ) {
		/* Tell the user that we could not find a usable */
		/* WinSock DLL.                                  */
		return 1;
	}
 

	struct sockaddr_in sa;
	struct hostent     *hp;
	SOCKET s;

	hp = gethostbyname("localhost");
	if (hp == NULL)					/* we don't know who this host is */
		return INVALID_SOCKET;

	memset(&sa,0,sizeof(sa));
	memcpy((char *)&sa.sin_addr, hp->h_addr, hp->h_length);   /* set address */
	sa.sin_family = hp->h_addrtype;
	sa.sin_port = htons((u_short)PORTNUM);

	s = socket(hp->h_addrtype, SOCK_STREAM, 0);
	if (s == INVALID_SOCKET)
		return INVALID_SOCKET;

	/* try to connect to the specified socket */
	if (connect(s, (struct sockaddr *)&sa, sizeof sa) == SOCKET_ERROR) {
		// you should check for error...
		//int last = WSAGetLastError();
		//....
		closesocket(s);
		return INVALID_SOCKET;
	}

	char str[] = "hello world";
	char inStr[256];
	int ret;
  
    ret = send( s, str, sizeof(str), 0 );  /*you should check the ret value ...*/
    ret = recv(s, inStr, sizeof(inStr), 0);
    printf("Client Received: %s", inStr);

  return 0;
}