一般控件我可以通过给于我们的属性设置，但我们不可能满足这些属性
比如我们要edit1.text只能是数字，虽然我可以在edit.change监控，但
其控件style已提供相应的style，下面是代码－－－－还有一些style自己
试一下。
var
defstyle: dWord;
begin
defstyle := GetWindowLong(Edit1.Handle, GWL_STYLE);
SetWindowLong(Edit1.Handle, GWL_STYLE, defstyle or ES_NUMBER)
end;
--------------------------------------------------------
{ Edit Control Styles }
{$EXTERNALSYM ES_LEFT}
ES_LEFT = 0;
{$EXTERNALSYM ES_CENTER}
ES_CENTER = 1;
{$EXTERNALSYM ES_RIGHT}
ES_RIGHT = 2;
{$EXTERNALSYM ES_MULTILINE}
ES_MULTILINE = 4;
{$EXTERNALSYM ES_UPPERCASE}
ES_UPPERCASE = 8;
{$EXTERNALSYM ES_LOWERCASE}
ES_LOWERCASE = $10;
{$EXTERNALSYM ES_PASSWORD}
ES_PASSWORD = $20;
{$EXTERNALSYM ES_AUTOVSCROLL}
ES_AUTOVSCROLL = $40;
{$EXTERNALSYM ES_AUTOHSCROLL}
ES_AUTOHSCROLL = $80;
{$EXTERNALSYM ES_NOHIDESEL}
ES_NOHIDESEL = $100;
{$EXTERNALSYM ES_OEMCONVERT}
ES_OEMCONVERT = $400;
{$EXTERNALSYM ES_READONLY}
ES_READONLY = $800;
{$EXTERNALSYM ES_WANTRETURN}
ES_WANTRETURN = $1000;
{$EXTERNALSYM ES_NUMBER}
ES_NUMBER = $2000;
----------------------------------------------
{ Window Styles }
{$EXTERNALSYM WS_OVERLAPPED}
WS_OVERLAPPED = 0;
{$EXTERNALSYM WS_POPUP}
WS_POPUP = DWORD($80000000);
{$EXTERNALSYM WS_CHILD}
WS_CHILD = $40000000;
{$EXTERNALSYM WS_MINIMIZE}
WS_MINIMIZE = $20000000;
{$EXTERNALSYM WS_VISIBLE}
WS_VISIBLE = $10000000;
{$EXTERNALSYM WS_DISABLED}
WS_DISABLED = $8000000;
{$EXTERNALSYM WS_CLIPSIBLINGS}
WS_CLIPSIBLINGS = $4000000;
{$EXTERNALSYM WS_CLIPCHILDREN}
WS_CLIPCHILDREN = $2000000;
{$EXTERNALSYM WS_MAXIMIZE}
WS_MAXIMIZE = $1000000;
{$EXTERNALSYM WS_CAPTION}
WS_CAPTION = $C00000; { WS_BORDER or WS_DLGFRAME }
{$EXTERNALSYM WS_BORDER}
WS_BORDER = $800000;
{$EXTERNALSYM WS_DLGFRAME}
WS_DLGFRAME = $400000;
{$EXTERNALSYM WS_VSCROLL}
WS_VSCROLL = $200000;
{$EXTERNALSYM WS_HSCROLL}
WS_HSCROLL = $100000;
{$EXTERNALSYM WS_SYSMENU}
WS_SYSMENU = $80000;
{$EXTERNALSYM WS_THICKFRAME}
WS_THICKFRAME = $40000;
{$EXTERNALSYM WS_GROUP}
WS_GROUP = $20000;
{$EXTERNALSYM WS_TABSTOP}
WS_TABSTOP = $10000;
{$EXTERNALSYM WS_MINIMIZEBOX}
WS_MINIMIZEBOX = $20000;
{$EXTERNALSYM WS_MAXIMIZEBOX}
WS_MAXIMIZEBOX = $10000;
{$EXTERNALSYM WS_TILED}
WS_TILED = WS_OVERLAPPED;
{$EXTERNALSYM WS_ICONIC}
WS_ICONIC = WS_MINIMIZE;
{$EXTERNALSYM WS_SIZEBOX}
WS_SIZEBOX = WS_THICKFRAME;
{ Common Window Styles }
{$EXTERNALSYM WS_OVERLAPPEDWINDOW}
WS_OVERLAPPEDWINDOW = (WS_OVERLAPPED or WS_CAPTION or WS_SYSMENU or
WS_THICKFRAME or WS_MINIMIZEBOX or WS_MAXIMIZEBOX);
{$EXTERNALSYM WS_TILEDWINDOW}
WS_TILEDWINDOW = WS_OVERLAPPEDWINDOW;
{$EXTERNALSYM WS_POPUPWINDOW}
WS_POPUPWINDOW = (WS_POPUP or WS_BORDER or WS_SYSMENU);
{$EXTERNALSYM WS_CHILDWINDOW}
WS_CHILDWINDOW = (WS_CHILD);
{ Extended Window Styles }
{$EXTERNALSYM WS_EX_DLGMODALFRAME}
WS_EX_DLGMODALFRAME = 1;
{$EXTERNALSYM WS_EX_NOPARENTNOTIFY}
WS_EX_NOPARENTNOTIFY = 4;
{$EXTERNALSYM WS_EX_TOPMOST}
WS_EX_TOPMOST = 8;
{$EXTERNALSYM WS_EX_ACCEPTFILES}
WS_EX_ACCEPTFILES = $10;
{$EXTERNALSYM WS_EX_TRANSPARENT}
WS_EX_TRANSPARENT = $20;
{$EXTERNALSYM WS_EX_MDICHILD}
WS_EX_MDICHILD = $40;
{$EXTERNALSYM WS_EX_TOOLWINDOW}
WS_EX_TOOLWINDOW = $80;
{$EXTERNALSYM WS_EX_WINDOWEDGE}
WS_EX_WINDOWEDGE = $100;
{$EXTERNALSYM WS_EX_CLIENTEDGE}
WS_EX_CLIENTEDGE = $200;
{$EXTERNALSYM WS_EX_CONTEXTHELP}
WS_EX_CONTEXTHELP = $400;
{$EXTERNALSYM WS_EX_RIGHT}
WS_EX_RIGHT = $1000;
{$EXTERNALSYM WS_EX_LEFT}
WS_EX_LEFT = 0;
{$EXTERNALSYM WS_EX_RTLREADING}
WS_EX_RTLREADING = $2000;
{$EXTERNALSYM WS_EX_LTRREADING}
WS_EX_LTRREADING = 0;
{$EXTERNALSYM WS_EX_LEFTSCROLLBAR}
WS_EX_LEFTSCROLLBAR = $4000;
{$EXTERNALSYM WS_EX_RIGHTSCROLLBAR}
WS_EX_RIGHTSCROLLBAR = 0;
{$EXTERNALSYM WS_EX_CONTROLPARENT}
WS_EX_CONTROLPARENT = $10000;
{$EXTERNALSYM WS_EX_STATICEDGE}
WS_EX_STATICEDGE = $20000;
{$EXTERNALSYM WS_EX_APPWINDOW}
WS_EX_APPWINDOW = $40000;
{$EXTERNALSYM WS_EX_OVERLAPPEDWINDOW}
WS_EX_OVERLAPPEDWINDOW = (WS_EX_WINDOWEDGE or WS_EX_CLIENTEDGE);
{$EXTERNALSYM WS_EX_PALETTEWINDOW}
WS_EX_PALETTEWINDOW = (WS_EX_WINDOWEDGE or WS_EX_TOOLWINDOW or WS_EX_TOPMOST);
{$EXTERNALSYM WS_EX_LAYERED}
WS_EX_LAYERED = $00080000;
{$EXTERNALSYM WS_EX_NOINHERITLAYOUT}
WS_EX_NOINHERITLAYOUT = $00100000; // Disable inheritence of mirroring by children
{$EXTERNALSYM WS_EX_LAYOUTRTL}
WS_EX_LAYOUTRTL = $00400000; // Right to left mirroring
{$EXTERNALSYM WS_EX_COMPOSITED}
WS_EX_COMPOSITED = $02000000;
{$EXTERNALSYM WS_EX_NOACTIVATE}
WS_EX_NOACTIVATE = $08000000;
