C / C++ / MFC

int main()
{
	WSADATA wsa;
	int res = WSAStartup(MAKEWORD(2,2), &wsa);
	assert(res==0);

	SOCKADDR_IN addr_in;
	addr_in.sin_family = AF_INET;
	addr_in.sin_addr.s_addr = inet_addr("127.0.0.1");
	addr_in.sin_port = htons(5150);
	ZeroMemory(&addr_in.sin_zero, sizeof(addr_in.sin_zero));

	SOCKET s = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, 0);
	assert(s!=INVALID_SOCKET);
	SOCKADDR_IN addr_in_local;
	addr_in_local.sin_family = AF_INET;
	addr_in_local.sin_addr.s_addr = INADDR_ANY;
	addr_in_local.sin_port = 0;
	ZeroMemory(&addr_in_local.sin_zero, sizeof(addr_in_local.sin_zero));
	res = bind(s, (sockaddr*)&addr_in_local, sizeof(addr_in_local));
	assert(res==0);

	//prepare function
	{
		DWORD dwBytes;
		int res = WSAIoctl(s,
			SIO_GET_EXTENSION_FUNCTION_POINTER,
			&GuidConnectEx,
			sizeof(GuidConnectEx),
			&g_lpfnConnectEx,
			sizeof(g_lpfnConnectEx),
			&dwBytes,
			NULL,
			NULL);

		int err = WSAGetLastError();

		assert(res==0);
	}	

	DWORD bytes_sent;
	BOOL ok = (*g_lpfnConnectEx)(s, (sockaddr*)&addr_in, sizeof(addr_in), NULL, 0, &bytes_sent, NULL);
	int err = WSAGetLastError();
	assert(ok);
	//int ok = connect(s, (sockaddr*)&addr_in, sizeof(addr_in));
	//assert(ok==0);

	for (int i=0; i<10; ++i)
	{
		char buf[256];
		sprintf_s(buf, sizeof(buf), "message %d", i);
		WSABUF wsa_buf;
		wsa_buf.buf = buf;
		wsa_buf.len = strlen(buf);
		DWORD bytes_sent;
		int res = WSASend(s, &wsa_buf, 1, &bytes_sent, 0, NULL, NULL);
		assert(res==0 && bytes_sent==wsa_buf.len);
		printf_s("sent: %s\n", buf);
		Sleep(1000);
	}

	WSACleanup();

	return 0;
}

followait wrote:

tried, still not work

followait wrote:

but still can't connect successfully.

followait wrote:

the error code of ConnectEx is 87, it means "The parameter is incorrect.".

followait wrote:

BOOL ok = (*g_lpfnConnectEx)(s, (sockaddr*)&addr_in, sizeof(addr_in), NULL, 0, &bytes_sent, NULL);

Aescleal wrote:

Pointers and arrays in C++ are really advanced concepts.