// Don't forget the following next two lines before using this function
//		WSADATA			Data;
//		int status = WSAStartup(MAKEWORD(1,1), &Data);
const char *
_hostnameToDotIP(const char *IPAddr)
{
	struct in_addr iaHost;
	LPHOSTENT lpHostEntry;

	struct in_addr *pinAddr;
	
	iaHost.s_addr = inet_addr(IPAddr);
	if (iaHost.s_addr == INADDR_NONE)
	{
		lpHostEntry = gethostbyname(IPAddr);
		if (lpHostEntry == NULL)
			return NULL;

		pinAddr = (LPIN_ADDR)lpHostEntry->h_addr_list[0];

		return inet_ntoa(*pinAddr);
	}
	else
		return IPAddr;

}

// Don't forget the following next two lines before using this function
//		WSADATA			Data;
//		int status = WSAStartup(MAKEWORD(1,1), &Data);
// This function is a reverse function of inet_addr
const char *
rev_inet_addr(__u32 netByteIPAddr32)
{
	struct in_addr addr;
    addr.s_addr = netByteIPAddr32;

	return inet_ntoa(addr);
}

------------------------------------------

#include "stdafx.h"

int (*f)(int arg);  

int func(int n){
	return n * n; 
}   

int main()
{
	int i;
	
    	f = func;  
    	i = (*f)(3);                        

	return 0;
}

------------------------------------------


dummy(int *a)
{
	*a = 5;
}

main()
{
	int b;
	dummy(&b);
}

------------------------------------------

#include "stdafx.h"


struct ANT
{
	int a;
	long *b;
};


void dummy(struct ANT *aa)
{
	(*aa).a = 100;
	(*aa).b = new long(1000);

}

void main()
{
	struct ANT ant;

    dummy(&ant);
}

------------------------------------------



コンストラクタに、他のクラスのポインタを持たせる方法


// testtest.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

class B
{
public:

	B()
	{
		i = 0;
	}

	int func1(void)
	{
		i = i + 1;
		return i;
	}


private:
	int i;

};

class A
{
public:
	A(B* bb)
	{
		m_Bptr = bb;
	};

	int b_func1(void)
	{
		return m_Bptr->func1();
	};

private:
	B* m_Bptr;

};

class C
{
public:
	C(B* cc)
	{
		m_Bptr = cc;
	};

	int b_func1(void)
	{
		return m_Bptr->func1();
	};

private:
	B* m_Bptr;

};



int main(int argc, char* argv[])
{
	B b;
//	B* ptr = &b;

	A a(&b);
	C c(&b);

	int ccc = a.b_func1()	;
	ccc = c.b_func1()	;

	return 0;
}