error LNK2019: unresolved external symbol _GetIpAddrTable@12

#include "windows.h"
#include "iphlpapi.h" //IP Helper api

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Ip Address") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, // window class name
TEXT ("Ip Address"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL) ; // creation parameters

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
RECT rect ;
DWORD i;
TCHAR szName[] = TEXT ("IP ADDRESS") ;

MIB_IPADDRTABLE *pIPAddrTable;
DWORD dwSize = 0;
DWORD dwRetVal;

//For error : GetIpAddrTable call failed
int iLength;
TCHAR szBuffer[40],szBuffer1[40],szBuffer2[40],szBuffer3[40],szBuffer4[40],szBuffer5[40];

switch (message)
{

case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;

GetClientRect (hwnd, &rect) ;

TextOut(hdc,0,1,szName,lstrlen(szName));

pIPAddrTable = (MIB_IPADDRTABLE*) malloc( sizeof(MIB_IPADDRTABLE) );


/* Get size required by GetIpAddrTable() */
//The GetIpAddrTable function retrieves the interface–to–IPv4 address mapping table.
if (GetIpAddrTable(pIPAddrTable,&dwSize, 0) == ERROR_INSUFFICIENT_BUFFER)
{
free( pIPAddrTable );
pIPAddrTable = (MIB_IPADDRTABLE *) malloc ( dwSize );
}

if ( (dwRetVal = GetIpAddrTable( pIPAddrTable, &dwSize, 0 )) != NO_ERROR )
{
TextOut(hdc,0,20,szBuffer,iLength = wsprintf(szBuffer, TEXT("GetIpAddrTable call failed with %d"),dwRetVal));
}

TextOut(hdc,0,20,szBuffer1,iLength = wsprintf(szBuffer1, TEXT("IP Address: %ld\n"), pIPAddrTable->table[0].dwAddr));
TextOut(hdc,0,40,szBuffer2,iLength = wsprintf(szBuffer2, TEXT("IP Mask: %ld\n"), pIPAddrTable->table[0].dwMask));
TextOut(hdc,0,60,szBuffer3,iLength = wsprintf(szBuffer3, TEXT("IF Index: %ld\n"), pIPAddrTable->table[0].dwIndex));
TextOut(hdc,0,80,szBuffer4,iLength = wsprintf(szBuffer4, TEXT("Broadcast Addr: %ld\n"), pIPAddrTable->table[0].dwBCastAddr));
TextOut(hdc,0,100,szBuffer5,iLength = wsprintf(szBuffer5, TEXT("Re-assembly size: %ld\n"), pIPAddrTable->table[0].dwReasmSize));

EndPaint (hwnd, &ps) ;
return 0 ;

case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}


"I am getting this error "

1>------ Build started: Project: iptrace, Configuration: Debug Win32 ------
1>Compiling...
1>iptrace.cpp
1>.\iptrace.cpp(67) : warning C4101: 'i' : unreferenced local variable
1>Linking...
1>iptrace.obj : error LNK2019: unresolved external symbol _GetIpAddrTable@12 referenced in function "long __stdcall WndProc(struct HWND__ *,unsigned int,unsigned int,long)" (?WndProc@@YGJPAUHWND__@@IIJ@Z)
1>C:\Documents and Settings\Amit\My Documents\Visual Studio 2008\Projects\iptrace\Debug\iptrace.exe : fatal error LNK1120: 1 unresolved externals
1>Build log was saved at "file://c:\Documents and Settings\Amit\My Documents\Visual Studio 2008\Projects\iptrace\iptrace\Debug\BuildLog.htm"
1>iptrace - 2 error(s), 1 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Tags: C++, Visual Basic (Visual Basic 9 (2008)), Visual Studio, Errors