Socket Programming

Basics
Create a Project in VC++ 4.0.
The files in the project will be
a1.cpp
wsock32.lib
a1.cpp

#include <windows.h>
#include <stdio.h>
void abc(char *p)
{
        FILE *fp=fopen("z.txt","a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}
WNDCLASS a;HWND b;MSG c;

long _stdcall zzz (HWND,UINT,WPARAM,LPARAM);
int _stdcall WinMain(HINSTANCE i,HINSTANCE j,char *k,int l)
{
	a.lpszClassName="a1";
	a.hInstance=i;
	a.lpfnWndProc=zzz;
	a.hbrBackground=GetStockObject(WHITE_BRUSH);
	RegisterClass(&a);
	b=CreateWindow("a1","aaa",WS_OVERLAPPEDWINDOW,1,1,10,20,0,0,i,0);
	ShowWindow(b,3);
	while ( GetMessage(&c,0,0,0) )
		DispatchMessage(&c);
	return 1;
}

long _stdcall zzz (HWND w,UINT x,WPARAM y,LPARAM z)
{
	if ( x == WM_LBUTTONDOWN)
	{       
        MessageBox(0,"end","end",0);
	}
	if ( x == WM_DESTROY)
		PostQuitMessage(0);
	return DefWindowProc(w,x,y,z);
}

a1.cpp

#include <windows.h>
#include <stdio.h>
void abc(char *p)
{
        FILE *fp=fopen("z.txt","a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}

WNDCLASS a;HWND b;MSG c;char aa[200];char bb[20000];
WSADATA ws;DWORD e;
long _stdcall zzz (HWND,UINT,WPARAM,LPARAM);

int _stdcall WinMain(HINSTANCE i,HINSTANCE j,char *k,int l)
{
a.lpszClassName="a1";
a.hInstance=i;
a.lpfnWndProc=zzz;
a.hbrBackground=GetStockObject(WHITE_BRUSH);
RegisterClass(&a);
b=CreateWindow("a1","aaa",WS_OVERLAPPEDWINDOW,1,1,10,20,0,0,i,0);
ShowWindow(b,3);
while ( GetMessage(&c,0,0,0) )
	DispatchMessage(&c);
return 1;
}

long _stdcall zzz (HWND w,UINT x,WPARAM y,LPARAM z)
{
	if ( x == WM_LBUTTONDOWN)
	{	e=WSAStartup(0x0101,&ws);
		sprintf(aa,"e..%ld",e);
		MessageBox(0,aa,aa,0);
		abc(aa);
        MessageBox(0,"end","end",0);
	}
	if ( x == WM_DESTROY)
		PostQuitMessage(0);
	return DefWindowProc(w,x,y,z);
}

a1.cpp

#include <windows.h>
#include <stdio.h>
void abc(char *p)
{
        FILE *fp=fopen("z.txt","a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}
WNDCLASS a;HWND b;MSG c;char aa[200];char bb[20000];
WSADATA ws;DWORD e;
long _stdcall zzz (HWND,UINT,WPARAM,LPARAM);
int _stdcall WinMain(HINSTANCE i,HINSTANCE j,char *k,int l)
{
	a.lpszClassName="a1";
	a.hInstance=i;
	a.lpfnWndProc=zzz;
	a.hbrBackground=GetStockObject(WHITE_BRUSH);
	RegisterClass(&a);
	b=CreateWindow("a1","aaa",WS_OVERLAPPEDWINDOW,1,1,10,20,0,0,i,0);
	ShowWindow(b,3);
	while ( GetMessage(&c,0,0,0) )
		DispatchMessage(&c);
	return 1;
}
long _stdcall zzz (HWND w,UINT x,WPARAM y,LPARAM z)
{
	if ( x == WM_LBUTTONDOWN)
        {   abc("Before WSAStartup");
            sprintf(aa,"wVersion....%d",ws.wVersion);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"wHighVersion....%d",ws.wHighVersion);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"szDescription....%s",&ws.szDescription);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"szSystemStatus....%s",&ws.szSystemStatus);
            MessageBox(0,aa,aa,0);
            abc(aa);         
            sprintf(aa,"iMaxSockets....%u",ws.iMaxSockets);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"iMaxUdpDg....%u",ws.iMaxUdpDg);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"lpVendorInfo....%s",ws.lpVendorInfo);
            MessageBox(0,aa,aa,0);
            abc(aa); 
                       
            e=WSAStartup(0x0101,&ws);
            sprintf(aa,"e..%ld",e);
            MessageBox(0,aa,aa,0);
            abc("After WSAStartup");
            sprintf(aa,"wVersion....%d",ws.wVersion);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"wHighVersion....%d",ws.wHighVersion);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"szDescription....%s",&ws.szDescription);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"szSystemStatus....%s",&ws.szSystemStatus);
            MessageBox(0,aa,aa,0);
            abc(aa);         
            sprintf(aa,"iMaxSockets....%u",ws.iMaxSockets);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"iMaxUdpDg....%u",ws.iMaxUdpDg);
            MessageBox(0,aa,aa,0);
            abc(aa);
            sprintf(aa,"lpVendorInfo....%s",ws.lpVendorInfo);
            MessageBox(0,aa,aa,0);
            abc(aa); 
            MessageBox(0,"end","end",0);
	}
	if ( x == WM_DESTROY)
		PostQuitMessage(0);
	return DefWindowProc(w,x,y,z);
}

a1.cpp

#include <windows.h>
#include <stdio.h>
void abc(char *p)
{
        FILE *fp=fopen("z.txt","a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}
WNDCLASS a;HWND b;MSG c;char aa[200];SOCKET s;
WSADATA ws;DWORD e;
long _stdcall zzz (HWND,UINT,WPARAM,LPARAM);
int _stdcall WinMain(HINSTANCE i,HINSTANCE j,char *k,int l)
{
	a.lpszClassName="a1";
	a.hInstance=i;
	a.lpfnWndProc=zzz;
	a.hbrBackground=GetStockObject(WHITE_BRUSH);
	RegisterClass(&a);
	b=CreateWindow("a1","aaa",WS_OVERLAPPEDWINDOW,1,1,10,20,0,0,i,0);
	ShowWindow(b,3);
	while ( GetMessage(&c,0,0,0) )
		DispatchMessage(&c);
	return 1;
}
long _stdcall zzz (HWND w,UINT x,WPARAM y,LPARAM z)
{
	if ( x == WM_LBUTTONDOWN)
	{	
		e=WSAStartup(0x0101,&ws);
		sprintf(aa,"e=%ld",e);
        abc(aa);
		s=socket(PF_INET,SOCK_DGRAM,0);
		sprintf(aa,"s=%ld",s);
        abc(aa);
		MessageBox(0,aa,aa,0);
        MessageBox(0,"end","end",0);
	}
	if ( x == WM_DESTROY)
		PostQuitMessage(0);
	return DefWindowProc(w,x,y,z);
}

a1.cpp

#include <windows.h>
#include <stdio.h>
void abc(char *p)
{
        FILE *fp=fopen("z.txt","a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}
WNDCLASS a;HWND b;MSG c;char aa[200];
WSADATA ws;DWORD e;long dd;
long _stdcall zzz (HWND,UINT,WPARAM,LPARAM);
int _stdcall WinMain(HINSTANCE i,HINSTANCE j,char *k,int l)
{
	a.lpszClassName="a1";
	a.hInstance=i;
	a.lpfnWndProc=zzz;
	a.hbrBackground=GetStockObject(WHITE_BRUSH);
	RegisterClass(&a);
	b=CreateWindow("a1","aaa",WS_OVERLAPPEDWINDOW,1,1,10,20,0,0,i,0);
	ShowWindow(b,3);
	while ( GetMessage(&c,0,0,0) )
		DispatchMessage(&c);
	return 1;
}
long _stdcall zzz (HWND w,UINT x,WPARAM y,LPARAM z)
{
	if ( x == WM_LBUTTONDOWN)
	{	
		dd = inet_addr("140.252.1.32");
        sprintf(aa,"dd=%ld",dd);
        abc(aa);
		MessageBox(0,aa,aa,0);
        MessageBox(0,"end","end",0);
	}
	if ( x == WM_DESTROY)
		PostQuitMessage(0);
	return DefWindowProc(w,x,y,z);
}

a1.cpp

#include <windows.h>
#include <stdio.h>
void abc(char *p)
{
        FILE *fp=fopen("z.txt","a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}
WNDCLASS a;HWND b;MSG c;char aa[200];
WSADATA ws;DWORD e;long dd;struct in_addr sa;
long _stdcall zzz (HWND,UINT,WPARAM,LPARAM);
int _stdcall WinMain(HINSTANCE i,HINSTANCE j,char *k,int l)
{
	a.lpszClassName="a1";
	a.hInstance=i;
	a.lpfnWndProc=zzz;
	a.hbrBackground=GetStockObject(WHITE_BRUSH);
	RegisterClass(&a);
	b=CreateWindow("a1","aaa",WS_OVERLAPPEDWINDOW,1,1,10,20,0,0,i,0);
	ShowWindow(b,3);
	while ( GetMessage(&c,0,0,0) )
		DispatchMessage(&c);
	return 1;
}
long _stdcall zzz (HWND w,UINT x,WPARAM y,LPARAM z)
{
	if ( x == WM_LBUTTONDOWN)
	{	
                sa.s_addr = inet_addr("140.252.1.32");
                sprintf(aa,"sa.s_addr=%ld",sa.s_addr);
                abc(aa);
		MessageBox(0,aa,aa,0);
		char *p=inet_ntoa(sa);
		sprintf(aa,"p=%s",p);
		MessageBox(0,aa,aa,0);
		MessageBox(0,"hi","hi",0);
	}
	if ( x == WM_DESTROY)
		PostQuitMessage(0);
	return DefWindowProc(w,x,y,z);
}

a1.cpp

#include <windows.h>
#include <stdio.h>
void abc(char *p)
{
        FILE *fp=fopen("z.txt","a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}
WNDCLASS a;HWND b;MSG c;char aa[200];SOCKET s;
WSADATA ws;DWORD e;long ii;
long _stdcall zzz (HWND,UINT,WPARAM,LPARAM);
int _stdcall WinMain(HINSTANCE i,HINSTANCE j,char *k,int l)
{
	a.lpszClassName="a1";
	a.hInstance=i;
	a.lpfnWndProc=zzz;
	a.hbrBackground=GetStockObject(WHITE_BRUSH);
	RegisterClass(&a);
	b=CreateWindow("a1","aaa",WS_OVERLAPPEDWINDOW,1,1,10,20,0,0,i,0);
	ShowWindow(b,3);
	while ( GetMessage(&c,0,0,0) )
		DispatchMessage(&c);
	return 1;
}
long _stdcall zzz (HWND w,UINT x,WPARAM y,LPARAM z)
{
	if ( x == WM_LBUTTONDOWN)
	{	
		ii=htons(2);
                sprintf(aa,"ii.htons(2)=..%ld",ii);
                abc(aa);
		MessageBox(0,aa,aa,0);
                ii=htons(512);
                sprintf(aa,"ii.htons(512)=..%ld",ii);
                abc(aa);
		MessageBox(0,aa,aa,0);
                MessageBox(0,"end","end",0);
	}
	if ( x == WM_DESTROY)
		PostQuitMessage(0);
	return DefWindowProc(w,x,y,z);
}
Download the Source Code.
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