Simple Windows system information program.

/*
 
Simple program to print out information about a Windows system. This will print:
 
Computer name,
User name:
System directory,
Windows directory,
and the free and total space on Drive C:\.
 
*/
 
#include "stdafx.h"
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <stdlib.h>
 
TCHAR* envVarStrings[] =
{
	TEXT("OS         = %OS%"),
	TEXT("PATH       = %PATH%"),
	TEXT("HOMEPATH   = %HOMEPATH%"),
	TEXT("TEMP       = %TEMP%")
};
#define  ENV_VAR_STRING_COUNT  (sizeof(envVarStrings)/sizeof(TCHAR*))
#define INFO_BUFFER_SIZE 32767
 
int main()
{
	DWORD i;
	TCHAR  infoBuf[INFO_BUFFER_SIZE];
	DWORD  bufCharCount = INFO_BUFFER_SIZE;
 
	printf("Windows system information.\n\n");
 
	// Get and display the name of the computer. 
	bufCharCount = INFO_BUFFER_SIZE;
	if (!GetComputerName(infoBuf, &bufCharCount))
		_tprintf(TEXT("GetComputerName"));
	_tprintf(TEXT("\nComputer name:      %s"), infoBuf);
 
	// Get and display the user name. 
	bufCharCount = INFO_BUFFER_SIZE;
	if (!GetUserName(infoBuf, &bufCharCount))
		_tprintf(TEXT("GetUserName"));
	_tprintf(TEXT("\nUser name:          %s"), infoBuf);
 
	// Get and display the system directory. 
	if (!GetSystemDirectory(infoBuf, INFO_BUFFER_SIZE))
		_tprintf(TEXT("GetSystemDirectory"));
	_tprintf(TEXT("\nSystem Directory:   %s"), infoBuf);
 
	// Get and display the Windows directory. 
	if (!GetWindowsDirectory(infoBuf, INFO_BUFFER_SIZE))
		_tprintf(TEXT("GetWindowsDirectory"));
	_tprintf(TEXT("\nWindows Directory:  %s"), infoBuf);
 
	/*
	The following code from:
	http://stackoverflow.com/questions/11917946/how-do-i-get-available-disk-space-from-windows-using-c
	*/
 
	BOOL  fResult;
	unsigned __int64 i64FreeBytesToCaller,
		i64TotalBytes,
		i64FreeBytes;
	fResult = GetDiskFreeSpaceEx(L"C:",
		(PULARGE_INTEGER)&i64FreeBytesToCaller,
		(PULARGE_INTEGER)&i64TotalBytes,
		(PULARGE_INTEGER)&i64FreeBytes);
	if (fResult)
	{
		printf("\n\nAvailable disk space on Drive C:\\ \n\n");
	/*	printf("Available space to caller = %I64u MB\n",
			i64FreeBytesToCaller / (1024 * 1024)); */
		printf("Total space on partition:            = %I64u MB\n",
			i64TotalBytes / (1024 * 1024));
		printf("Free space on drive partition:       = %I64u MB\n",
			i64FreeBytes / (1024 * 1024));
	}
 
	return 0;
}

 
// stdafx.cpp : source file that includes just the standard includes
// Jason.pch will be the pre-compiled header
// stdafx.obj will contain the pre-compiled type information
 
#include "stdafx.h"
 
// TODO: reference any additional headers you need in STDAFX.H
// and not in this file

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//
#define _WINSOCK_DEPRECATED_NO_WARNINGS
 
#pragma once
 
#include "targetver.h"
 
#include <stdio.h>
#include <tchar.h>
 
// TODO: reference additional headers your program requires here

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0600
#endif
 
#include "stdafx.h"
#include <stdio.h>
#include <winsock2.h>
#include <iphlpapi.h>
#include <ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "iphlpapi.lib")
 
void print_adapter(PIP_ADAPTER_ADDRESSES aa)
{
	char buf[BUFSIZ];
	memset(buf, 0, BUFSIZ);
	WideCharToMultiByte(CP_ACP, 0, aa->FriendlyName, wcslen(aa->FriendlyName), buf, BUFSIZ, NULL, NULL);
	printf("adapter_name: %s\n", buf);
}
 
void print_addr(PIP_ADAPTER_UNICAST_ADDRESS ua)
{
	char buf[BUFSIZ];
 
	int family = ua->Address.lpSockaddr->sa_family;
	printf("\t%s ", family == AF_INET ? "IPv4" : "IPv6");
 
	memset(buf, 0, BUFSIZ);
	getnameinfo(ua->Address.lpSockaddr, ua->Address.iSockaddrLength, buf, sizeof(buf), NULL, 0, NI_NUMERICHOST);
	printf("%s\n", buf);
}
 
bool print_ipaddress()
{
	DWORD rv, size;
	PIP_ADAPTER_ADDRESSES adapter_addresses, aa;
	PIP_ADAPTER_UNICAST_ADDRESS ua;
 
	rv = GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX, NULL, NULL, &size);
	if (rv != ERROR_BUFFER_OVERFLOW) {
		fprintf(stderr, "GetAdaptersAddresses() failed...");
		return false;
	}
	adapter_addresses = (PIP_ADAPTER_ADDRESSES)malloc(size);
 
	rv = GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX, NULL, adapter_addresses, &size);
	if (rv != ERROR_SUCCESS) {
		fprintf(stderr, "GetAdaptersAddresses() failed...");
		free(adapter_addresses);
		return false;
	}
 
	for (aa = adapter_addresses; aa != NULL; aa = aa->Next) {
		print_adapter(aa);
		for (ua = aa->FirstUnicastAddress; ua != NULL; ua = ua->Next) {
			print_addr(ua);
		}
	}
 
	free(adapter_addresses);
}
 
int main()
{
 
	fprintf(stdout, "Windows network adapter information.\n");
 
	WSAData d;
	if (WSAStartup(MAKEWORD(2, 2), &d) != 0) {
		return -1;
	}
 
	print_ipaddress();
 
	WSACleanup();
 
    return 0;
}