TCP optimisation

TCP optimisation

I've written a code using SOL_SOCKET protocol but getting error as 10043
(error in socket).
The code is as follows:
#include <QCoreApplication>
#include<QDebug>
//#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
/****************************************/
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")
/****************************************/
#define DEFAULT_BUFLEN 512
int recvbuflen = DEFAULT_BUFLEN;
char recvbuf[DEFAULT_BUFLEN];
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
WSADATA wsaData;
int iResult;
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
ZeroMemory( &hints, sizeof(hints) );
//hints.ai_family = AF_UNSPEC;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = SOL_SOCKET;
//hints.ai_protocol = IPPROTO_TCP;
#define DEFAULT_PORT "10990"
// Resolve the server address and port
iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
if (iResult != 0) {
printf("getaddrinfo failed: %d\n", iResult);
WSACleanup();
return 1;
}
SOCKET ConnectSocket = INVALID_SOCKET;
// Attempt to connect to the first address returned by
// the call to getaddrinfo
ptr=result;
// Create a SOCKET for connecting to server
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (ConnectSocket == INVALID_SOCKET) {
printf("Error at socket(): %ld\n", WSAGetLastError());
freeaddrinfo(result);
WSACleanup();
return 1;
}
int rcvbuf = 8192; /* recv buffer size */
int z = setsockopt(ConnectSocket,SOL_SOCKET,SO_RCVBUF,
(char*)&rcvbuf,sizeof(rcvbuf));
do {
iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
if (iResult > 0)
printf("Bytes received: %d\n", iResult);
else if (iResult == 0)
printf("Connection closed\n");
else
printf("recv failed: %d\n", WSAGetLastError());
} while (iResult > 0);
return a.exec();
}
When I run it shows::
Error in socket:10043
I googled it and found that the error is because of wrong protocol for the
socket type,I tried to find the correct protocol and socket type match but
couldn't find.I tried every possible socket option and protocol match. Any
body facing the same problem?