如何让WindowsNT的程序在WindowsXP下运行

我是新手，正在学习《windows程序设计》，书中的一个例题
源代码如下：#define WINVER 0x0500 #include <windows.h>
#include "SYSMETS1.h"LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrecInstance,LPSTR lpCmdLine,int nCmdShow)
{
static TCHAR szAppName[]=TEXT("SysMet2");
HWND hwnd;
MSG msg;
WNDCLASS wndclass; wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hInstance=hInstance;
wndclass.lpfnWndProc=WndProc;
wndclass.lpszClassName=szAppName;
wndclass.lpszMenuName=NULL;
wndclass.style=CS_HREDRAW|CS_VREDRAW; if(RegisterClass(&wndclass))
{
MessageBox(NULL,TEXT("This program requires Windows NT!"),szAppName,MB_ICONERROR);
return 0;
} hwnd=CreateWindow(szAppName,TEXT("Get System Metrics No. 2"),
WS_OVERLAPPEDWINDOW | WS_VSCROLL,
                CW_USEDEFAULT, CW_USEDEFAULT,
                CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ; ShowWindow(hwnd,nCmdShow);
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)

{

    static int  cxChar, cxCaps, cyChar, cyClient, iVscrollPos ;

    HDC         hdc ;

    int         i, y ;

    PAINTSTRUCT ps ;

    TCHAR       szBuffer[10] ;

    TEXTMETRIC  tm ;

    switch (message)

    {

case WM_CREATE:

    hdc = GetDC (hwnd) ;

    GetTextMetrics (hdc, &tm) ;

    cxChar = tm.tmAveCharWidth ;

    cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2 ;

    cyChar = tm.tmHeight + tm.tmExternalLeading ;
            ReleaseDC (hwnd, hdc) ;

    SetScrollRange (hwnd, SB_VERT, 0, NUMLINES - 1, FALSE) ;

    SetScrollPos   (hwnd, SB_VERT, iVscrollPos, TRUE) ;

            return 0 ;
            case WM_SIZE:

            cyClient = HIWORD (lParam) ;

            return 0 ;
            case WM_VSCROLL:

            switch (LOWORD (wParam))

         {

    case SB_LINEUP:

          iVscrollPos -= 1 ;

            break ;



    case SB_LINEDOWN:

            iVscrollPos += 1 ;

            break ;
            case SB_PAGEUP:

            iVscrollPos -= cyClient / cyChar ;

            break ;



    case SB_PAGEDOWN:

            iVscrollPos += cyClient / cyChar ;

            break ;



    case SB_THUMBPOSITION:

            iVscrollPos = HIWORD (wParam) ;

            break ;



    default :

            break ;

         }
            iVscrollPos = max (0, min (iVscrollPos, NUMLINES - 1)) ;

    if (iVscrollPos != GetScrollPos (hwnd, SB_VERT))

         {

            SetScrollPos (hwnd, SB_VERT, iVscrollPos, TRUE) ;

            InvalidateRect (hwnd, NULL, TRUE) ;

         }

            return 0 ;

    case WM_PAINT:

            hdc = BeginPaint (hwnd, &ps) ;

            for (i = 0 ; i < NUMLINES ; i++)

            {

                   y = cyChar * (i - iVscrollPos) ;

                   TextOut (hdc, 0, y,

                           sysmetrics[i].szLabel,

                           lstrlen (sysmetrics[i].szLabel)) ;



                   TextOut (hdc, 22 * cxCaps, y,

                           sysmetrics[i].szDesc,

                           lstrlen (sysmetrics[i].szDesc)) ;



                   SetTextAlign (hdc, TA_RIGHT | TA_TOP) ;

                   TextOut (hdc, 22 * cxCaps + 40 * cxChar, y, szBuffer,

                           wsprintf (szBuffer, TEXT ("%5d"),

                                          GetSystemMetrics (sysmetrics[i].Index))) ;

                   SetTextAlign (hdc, TA_LEFT | TA_TOP) ;

        }

            EndPaint (hwnd, &ps) ;

            return 0 ;
            case WM_DESTROY:

            PostQuitMessage (0) ;

            return 0 ;

    }

    return DefWindowProc (hwnd, message, wParam, lParam) ;

}哪位大哥能给看一下，让它能在WindowsXP下显示窗口，万分感谢！！！

解决方案 »

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头文件如下：
/*---------------------------------------------------------

SYSMETS.H -- System metrics display structure

-----------------------------------------------------------*/
#include <windows.h>

#define NUMLINES ((int) (sizeof sysmetrics / sizeof sysmetrics [0]))

struct

{

    int    Index ;

    TCHAR *       szLabel ;

   TCHAR *       szDesc ;

}

sysmetrics [] =

{

  SM_CXSCREEN,    TEXT ("SM_CXSCREEN"),

                  TEXT ("Screen width in pixels"),

    SM_CYSCREEN, TEXT ("SM_CYSCREEN"),

                         TEXT ("Screen height in pixels"),

    SM_CXVSCROLL, TEXT ("SM_CXVSCROLL"),

                          TEXT ("Vertical scroll width"),

    SM_CYHSCROLL,  TEXT ("SM_CYHSCROLL"),

                          TEXT ("Horizontal scroll height"),

    SM_CYCAPTION, TEXT ("SM_CYCAPTION"),

                             TEXT ("Caption bar height"),

    SM_CXBORDER, TEXT ("SM_CXBORDER"),

                          TEXT ("Window border width"),

    SM_CYBORDER,  TEXT ("SM_CYBORDER"),

                          TEXT ("Window border height"),

    SM_CXFIXEDFRAME,TEXT ("SM_CXFIXEDFRAME"),

                          TEXT ("Dialog window frame width"),

    SM_CYFIXEDFRAME,TEXT ("SM_CYFIXEDFRAME"),

                          TEXT ("Dialog window frame height"),

    SM_CYVTHUMB,  TEXT ("SM_CYVTHUMB"),

                         TEXT ("Vertical scroll thumb height"),

    SM_CXHTHUMB,    TEXT ("SM_CXHTHUMB"),

                             TEXT ("Horizontal scroll thumb width"),

    SM_CXICON,       TEXT ("SM_CXICON"),

                          TEXT ("Icon width"),

    SM_CYICON,       TEXT ("SM_CYICON"),

                        TEXT ("Icon height"),

    SM_CXCURSOR,  TEXT ("SM_CXCURSOR"),

                          TEXT ("Cursor width"),

    SM_CYCURSOR,    TEXT ("SM_CYCURSOR"),

                          TEXT ("Cursor height"),

    SM_CYMENU,       TEXT ("SM_CYMENU"),

                          TEXT ("Menu bar height"),

    SM_CXFULLSCREEN,TEXT ("SM_CXFULLSCREEN"),

                          TEXT ("Full screen client area width"),

    SM_CYFULLSCREEN,TEXT ("SM_CYFULLSCREEN"),

                          TEXT ("Full screen client area height"),

    SM_CYKANJIWINDOW,TEXT ("SM_CYKANJIWINDOW"),

                           TEXT ("Kanji window height"),

    SM_MOUSEPRESENT, TEXT ("SM_MOUSEPRESENT"),

                           TEXT ("Mouse present flag"),

    SM_CYVSCROLL,TEXT ("SM_CYVSCROLL"),

                           TEXT ("Vertical scroll arrow height"),

    SM_CXHSCROLL,TEXT ("SM_CXHSCROLL"),

                          TEXT ("Horizontal scroll arrow width"),

    SM_DEBUG,         TEXT ("SM_DEBUG"),

                           TEXT ("Debug version flag"),

    SM_SWAPBUTTON,TEXT ("SM_SWAPBUTTON"),

                           TEXT ("Mouse buttons swapped flag"),

    SM_CXMIN,         TEXT ("SM_CXMIN"),

                           TEXT ("Minimum window width"),

    SM_CYMIN,         TEXT ("SM_CYMIN"),

                           TEXT ("Minimum window height"),

    SM_CXSIZE,        TEXT ("SM_CXSIZE"),

                           TEXT ("Min/Max/Close button width"),
   　/*未完，待续*/
SM_CYSIZE,       TEXT ("SM_CYSIZE"),

                           TEXT ("Min/Max/Close button height"),

    SM_CXSIZEFRAME,TEXT ("SM_CXSIZEFRAME"),

                           TEXT ("Window sizing frame width"),

    SM_CYSIZEFRAME,TEXT ("SM_CYSIZEFRAME"),

                           TEXT ("Window sizing frame height"),

    SM_CXMINTRACK,TEXT ("SM_CXMINTRACK"),

                           TEXT ("Minimum window tracking width"),

    SM_CYMINTRACK,TEXT ("SM_CYMINTRACK"),

                           TEXT ("Minimum window tracking height"),

    SM_CXDOUBLECLK,TEXT ("SM_CXDOUBLECLK"),

                           TEXT ("Double click x tolerance"),

    SM_CYDOUBLECLK,TEXT ("SM_CYDOUBLECLK"),

                           TEXT ("Double click y tolerance"),

    SM_CXICONSPACING,TEXT ("SM_CXICONSPACING"),

                           TEXT ("Horizontal icon spacing"),

    SM_CYICONSPACING,TEXT ("SM_CYICONSPACING"),

                           TEXT ("Vertical icon spacing"),

    SM_MENUDROPALIGNMENT,TEXT ("SM_MENUDROPALIGNMENT"),

                                  TEXT ("Left or right menu drop"),

    SM_PENWINDOWS,       TEXT ("SM_PENWINDOWS"),

                                  TEXT ("Pen extensions installed"),

    SM_DBCSENABLED,       TEXT ("SM_DBCSENABLED"),

                                  TEXT ("Double-Byte Char Set enabled"),

    SM_CMOUSEBUTTONS,        TEXT ("SM_CMOUSEBUTTONS"),

                                 TEXT ("Number of mouse buttons"),

    SM_SECURE,               TEXT ("SM_SECURE"),

                                  TEXT ("Security present flag"),

    SM_CXEDGE,               TEXT ("SM_CXEDGE"),

                                  TEXT ("3-D border width"),

    SM_CYEDGE,               TEXT ("SM_CYEDGE"),

                                  TEXT ("3-D border height"),

    SM_CXMINSPACING,         TEXT ("SM_CXMINSPACING"),

                                  TEXT ("Minimized window spacing width"),

    SM_CYMINSPACING,         TEXT ("SM_CYMINSPACING"),

                                  TEXT ("Minimized window spacing height"),

    SM_CXSMICON,         TEXT ("SM_CXSMICON"),

                                  TEXT ("Small icon width"),

    SM_CYSMICON,        TEXT ("SM_CYSMICON"),

                                  TEXT ("Small icon height"),

    SM_CYSMCAPTION,       TEXT ("SM_CYSMCAPTION"),

                                  TEXT ("Small caption height"),

    SM_CXSMSIZE,         TEXT ("SM_CXSMSIZE"),

                                 TEXT ("Small caption button width"),

    SM_CYSMSIZE,         TEXT ("SM_CYSMSIZE"),

                                  TEXT ("Small caption button height"),

    SM_CXMENUSIZE,       TEXT ("SM_CXMENUSIZE"),

                                  TEXT ("Menu bar button width"),

    SM_CYMENUSIZE,       TEXT ("SM_CYMENUSIZE"),

                                TEXT ("Menu bar button height"),

    SM_ARRANGE,              TEXT ("SM_ARRANGE"),

                                  TEXT ("How minimized windows arranged"),

    SM_CXMINIMIZED,      TEXT ("SM_CXMINIMIZED"),

                                  TEXT ("Minimized window width"),

    SM_CYMINIMIZED,       TEXT ("SM_CYMINIMIZED"),

                                  TEXT ("Minimized window height"),

    SM_CXMAXTRACK,       TEXT ("SM_CXMAXTRACK"),

                                  TEXT ("Maximum draggable width"),

    SM_CYMAXTRACK,       TEXT ("SM_CYMAXTRACK"),

                                 TEXT ("Maximum draggable height"),

    SM_CXMAXIMIZED,       TEXT ("SM_CXMAXIMIZED"),

                                  TEXT ("Width of maximized window"),

    SM_CYMAXIMIZED,       TEXT ("SM_CYMAXIMIZED"),

                                  TEXT ("Height of maximized window"),

    SM_NETWORK,          TEXT ("SM_NETWORK"),

                                  TEXT ("Network present flag"),

    SM_CLEANBOOT,         TEXT ("SM_CLEANBOOT"),

                                  TEXT ("How system was booted"),

    SM_CXDRAG,               TEXT ("SM_CXDRAG"),

                                  TEXT ("Avoid drag x tolerance"),

    SM_CYDRAG,               TEXT ("SM_CYDRAG"),

                                  TEXT ("Avoid drag y tolerance"),

    SM_SHOWSOUNDS,        TEXT ("SM_SHOWSOUNDS"),

                                  TEXT ("Present sounds visually"),

    SM_CXMENUCHECK,       TEXT ("SM_CXMENUCHECK"),

                                 TEXT ("Menu check- width"),

    SM_CYMENUCHECK,       TEXT ("SM_CYMENUCHECK"),

                                 TEXT ("Menu check- height"),

    SM_SLOWMACHINE,       TEXT ("SM_SLOWMACHINE"),

                                  TEXT ("Slow processor flag"),

    SM_MIDEASTENABLED,       TEXT ("SM_MIDEASTENABLED"),

                                  TEXT ("Hebrew and Arabic enabled flag"),

    SM_MOUSEWHEELPRESENT,TEXT ("SM_MOUSEWHEELPRESENT"),

                                  TEXT ("Mouse wheel present flag"),

    SM_XVIRTUALSCREEN,       TEXT ("SM_XVIRTUALSCREEN"),

                                  TEXT ("Virtual screen x origin"),

    SM_YVIRTUALSCREEN,       TEXT ("SM_YVIRTUALSCREEN"),

                                  TEXT ("Virtual screen y origin"),

    SM_CXVIRTUALSCREEN,      TEXT ("SM_CXVIRTUALSCREEN"),

                                  TEXT ("Virtual screen width"),

    SM_CYVIRTUALSCREEN,      TEXT ("SM_CYVIRTUALSCREEN"),

                                  TEXT ("Virtual screen height"),

    SM_CMONITORS,       TEXT ("SM_CMONITORS"),

                                TEXT ("Number of monitors"),

    SM_SAMEDISPLAYFORMAT,TEXT ("SM_SAMEDISPLAYFORMAT"),

                                  TEXT ("Same color format flag")

} ;
if(!RegisterClass(&wndclass))