Need help with code

my code wont execute cos the something is wrong with the code

heres the code (note: its 101 lines)

code:
// includes ///////////////////////////
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <windowsx.h>
#include <stdio.h>
#include <math.h>
// DEFINES ///////////////////////////
// defines for windows
#define WINDOW_CLASS_NAME "WINCLASS1"
// GLOBALS ///////////////////////////
HWND main_window_handle = NULL; // save the window handle
// FUNCTIONS /////////////////////////
LRESULT CALLBACK WindowProc(HWND hwnd,
UINT msg, WPARAM wparam, LPARAM lparam)

{
// this is the main message handler of the system
PAINTSTRUCT ps; // used in WM_PAINT
HDC hdc; // handle to a device context
// find out what the message is
switch(msg)
{
case WM_CREATE: // called when window created
{
// do initialization stuff here
return(0);
} break;
case WM_PAINT: // called when window needs painting
{
// simply validate the window
hdc = BeginPaint(hwnd,&ps);
EndPaint(hwnd,&ps);
return(0);
} break;
case WM_DESTROY: // called when window is killed
{
// kill the application
PostQuitMessage(0);
return(0);
} break;
default:break;
} //end switch// process any messages that you didnt take care of
return (DefWindowProc (hwnd, msg, wparam, lparam));
} // end WinProc
// WINMAIN /////////////////////////////////
int WINAPI WinMain( HINSTANCE hinstance,
HINSTANCE hprevinstace,
LPSTR lpcmdline,
int ncmdshow)

{
WNDCLASS winclass; // this will hold the class you create
HWND hwnd; // generic window handle
MSG msg; // generic message
// first, fill in the window class structure
winclass.style = CS_DBLCLKS | CS_OWNDC |
CS_HREDRAW | CS_VREDRAW;
winclass.lpfnWndProc = WindowProc;
winclass.cbClsExtra = 0;
winclass.cbWndExtra = 0;
winclass.hInstance = hinstance;
winclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
winclass.hCursor = LoadCursor(NULL, IDC_ARROW);
winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
winclass.lpszMenuName = NULL;
winclass.lpszClassName = WINDOW_CLASS_NAME;
// register the window class
if (!RegisterClass(&winclass))
return(0);
// create the window
if (!(hwnd = CreateWindow(WINDOW_CLASS_NAME, // class
"Weener",
WS_OVERLAPPEDWINDOW | WS_VISIBLE, // flags
0,0, // x,y
320,200, // width, height
NULL, // handle to parent
NULL, // handle to menu
hinstance, // instance
NULL))) // creation parameters
return(0);
// save the window handle in global
main_window_handle - hwnd;
// enter main event loop
while(1)
{
if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
{
// test whether this is a quit
if (msg.message == WM_QUIT) break;
// translate accelrator keys
TranslateMessage(&msg);
// send the message to thw window proc
DispatchMessage(&msg);
} // end if
// main game processing goes here
} // end while
// return to Windows like this
return(msg.wParam);
} // end WinMain

the 2 errors i get are:
[Linker error] undefined reference to `GetStockObject@4'
ld returned 1 exit status

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