Thread: Socket programming in Windows

Hello C++ experts,

I would like to ask someone who already used C++ for windows socket programming. I am getting following errors:

identifier "Winsock" is undefined and many redefinition errors

I searched through stackoverflow forums and for these errors people suggested:

"
You need to re-order the includes of the Windows headers like so:
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <Windows.h>
In other words, the WinSock headers must be included before Windows.h.
"
I included WinSock header before Windows header and still can't get it working also tried other suggestions from this post:
c++ - socket errors can&#39;t get functions in WinSock2.h - Stack Overflow

Code:

#include "stdafx.h"
#include "Winsock.h"
#include <WinSock2.h>
#include <Windows.h>
#include <ws2bth.h>
#include <bthsdpdef.h>
#include <bluetoothapis.h>

#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "irprops.lib")

int main()
{
	if (!Winsock::InitialzedForCurrentProcess())
	{
		return 1;
	}

	Winsock winsock = Winsock(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);

	if (!winsock.IsValid())
	{
		return 1;
	}

	winsock.Bind();

	winsock.Listen();

	winsock.RegisterServcie(_T("RFCOMM Server Demo Instance"), _T("Pushing data to PC"), OBEXObjectPushServiceClass_UUID);

	winsock.OnConnected([](SOCKET s){
		char buffer[1024] = { 0 };

		memset(buffer, 0, sizeof(buffer));

		int r = 0;

		do
		{
			r = recv(s, (char*)buffer, sizeof(buffer), 0);

			printf("result:%d, %s\n", r, buffer);

		} while (r != 0);

		closesocket(s);
	});

	winsock.Accept();

	WSACleanup();

    return 0;
}

code source: [Bluetooth] – How to Host a RFCOMM Service in C++ – Practice & Share

Best regards

Originally Posted by Salem

> memset(buffer, 0, sizeof(buffer));
What does this line do, that the previous line didn't?

> r = recv(s, (char*)buffer, sizeof(buffer), 0);
If the buffer is completely full, where is the \0 that will stop printf(%s) from roaming all through memory?

If the first message is "I'm a banana" and the second message is "hello", what will be printed the second time?

In addition to removing stdafx.h, also remember to go into project->compiler settings and locate the tick box which says "use pre-compiled headers". Make sure this is turned OFF.

> RegisterServcie
Is this really how it's spelt?

Salem this is not my code, I copy/pasted it from msdn site as I mentioned at the end of my post. I tried removing stdafx.h and turned off VS option "use precompiled headers"


about website: Creating a Basic Winsock Application (Windows)

I already tried it before and I get the same errors

The original code requires the rest of the files from the github link in the blog post, not just what was pasted into the post.

Originally Posted by adeyblue

The original code requires the rest of the files from the github link in the blog post, not just what was pasted into the post.

Thank you it compiled now.