Disable key press

#pragma comment( lib, "user32.lib" )
#pragma comment( lib, "gdi32.lib" )
 
#include <windows.h> 
 
#define VK_F1 0x70
#define WINDOW_CLASS_NAME "VIRTUALKEYDEMO"
 
LRESULT CALLBACK WindowProc(HWND hwnd,
    UINT msg,
    WPARAM wparam,
    LPARAM lparam)
{
    HDC     hdc;
    switch(msg)
    {  
        case WM_DESTROY:
            {
                PostQuitMessage(0);
                return(0);
            }
            break;
        default:
            break;
    }
    return (DefWindowProc(hwnd, msg, wparam, lparam));
}
 
int WINAPI WinMain( HINSTANCE hinstance,
                    HINSTANCE hprevinstance,
                    LPSTR lpcmdline,
                    int ncmdshow)
{
 
    WNDCLASSEX winclass;
    HWND       hwnd;    
    MSG        msg;     
    HDC        hdc;     
 
    winclass.cbSize         = sizeof(WNDCLASSEX);
    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(WHITE_BRUSH);
    winclass.lpszMenuName   = NULL;
    winclass.lpszClassName  = WINDOW_CLASS_NAME;
    winclass.hIconSm        = LoadIcon(NULL, IDI_APPLICATION);
 
    if (!RegisterClassEx(&winclass))
        return(0);
 
    if (!(hwnd = CreateWindowEx(NULL,                
        WINDOW_CLASS_NAME,    
        "Virtual Key Demo for press and release of F1 key",
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        0,0,    
        400,100, 
        NULL,   
        NULL,   
        hinstance,
        NULL)))
        return(0);
    while(TRUE)
    {
        if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
        {
            if (msg.message == WM_QUIT)
                break;
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        hdc = GetDC(hwnd);
        if(GetAsyncKeyState(VK_F1) & 0x8000)
            TextOut(hdc, 0,16, "F1 key: Depressed", 18);
        else
            TextOut(hdc, 0,16, "                              ", 30);
        ReleaseDC(hwnd, hdc);
    }
    return(msg.wParam);
}