Winsock remote device discovery - c++

Question

I am new to winsock and I wish to use bluetooth for my project.
I wrote a simple code taking help from online resources to find remote devices
It should print the name of the remote devices but instead it prints some hex value I think...I dont know what that is
The code is
#include "stdafx.h"
#include<iostream>
#include<winsock2.h>
#include<ws2bth.h>
#include<bluetoothapis.h>
#include<stdlib.h>
using namespace std;
#define SUCCESS 0
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "irprops.lib")
int main()
{
WSADATA data;
int result;
result = WSAStartup(MAKEWORD(2, 2), &data);
if (result != SUCCESS)
{
cout << "error occured while initialising winsock...";
exit(result);
}
cout << "winsock initialisation successful\n";
WSAQUERYSET queryset;
memset(&queryset, 0, sizeof(WSAQUERYSET));
queryset.dwSize = sizeof(WSAQUERYSET);
queryset.dwNameSpace = NS_BTH;
HANDLE hLookup;
result = WSALookupServiceBegin(&queryset, LUP_CONTAINERS, &hLookup);
if (result != SUCCESS)
{
cout << "error in initialising look up service\n";
exit(result);
}
cout << "initialising lookup service successful\n";
BYTE buffer[4096];
memset(buffer, 0, sizeof(buffer));
DWORD bufferLength = sizeof(buffer);
WSAQUERYSET *pResults = (WSAQUERYSET*)&buffer;
while (result == SUCCESS)
{
result = WSALookupServiceNext(hLookup, LUP_RETURN_NAME | LUP_CONTAINERS | LUP_RETURN_ADDR | LUP_FLUSHCACHE | LUP_RETURN_TYPE | LUP_RETURN_BLOB | LUP_RES_SERVICE, &bufferLength, pResults);
if (result == SUCCESS)
{
//DEVICE FOUND
LPTSTR s = pResults->lpszServiceInstanceName;
cout << s << endl;
Sleep(1000);
}
}
WSALookupServiceEnd(hLookup);
return 0;
}
I require help in solving this issue
Thanks in advance for any help

Answer 1

You have a (potential) mismatch of character encodings. The line
LPTSTR s = pResults->lpszServiceInstanceName;
expands to
LPWSTR s = pResults->lpszServiceInstanceName;
if you have your project's character encoding set to Unicode (default setting). To output a Unicode string, you have to use std::wcout instead of std::cout:
LPCWSTR s = pResults->lpszServiceInstanceName;
wcout << s << endl;
To reduce the odds of inadvertently using an unexpected character encoding, code should explicitly specify the character encoding it uses. The code in the question should use WSAQUERYSETW, and call WSALookupServiceBeginW and WSALookupServiceNextW instead.
Explanation of the observed behavior:
std::cout interprets a const char* as a C-style string, and displays the characters until it finds a NUL character (see operator<<(std::basic_ostream)).
A const wchar_t*, on the other hand, is not interpreted to mean anything special. std::cout treats it like any other pointer, and prints its value using the hexadecimal numeral system by default (see std::basic_ostream::operator<<).