etrics (hdc, &tm) ;
cxChar = tm.tmAveCharWidth ;
cyChar = tm.tmHeight + tm.tmExternalLeading ;
ReleaseDC (hwnd, hdc) ;
return 0 ;
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;
SetMapMode (hdc, MM_ANISOTROPIC) ;
SetWindowExtEx (hdc, 1, 1, NULL) ;
SetViewportExtEx (hdc, cxChar, cyChar, NULL) ;
TextOut (hdc, 1, 1, szHeading, lstrlen (szHeading)) ;
TextOut (hdc, 1, 2, szUndLine, lstrlen (szUndLine)) ;
Show (hwnd, hdc, 1, 3, MM_TEXT, TEXT ("TEXT (pixels)")) ;
Show (hwnd, hdc, 1, 4, MM_LOMETRIC, TEXT ("LOMETRIC (.1 mm)")) ;
Show (hwnd, hdc, 1, 5, MM_HIMETRIC, TEXT ("HIMETRIC (.01 mm)")) ;
Show (hwnd, hdc, 1, 6, MM_LOENGLISH, TEXT ("LOENGLISH (.01 in)")) ;
Show (hwnd, hdc, 1, 7, MM_HIENGLISH,TEXT ("HIENGLISH (.001 in)")) ;
Show (hwnd, hdc, 1, 8, MM_TWIPS, EXT ("TWIPS (1/1440 in)")) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
为了便於用TextOut函式显示资讯，WHATSIZE使用了一种固定间距的字体。下面一条简单的叙述就可以切换为固定间距的字体（在Windows
3.0中它是优先使用的）：
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