WM_NCHITTEST 消息演示程序

代码如下：

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, Menus;

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    MainMenu1: TMainMenu;
    file1: TMenuItem;
  private
    { Private declarations }
    procedure myMsg(var msg:TWMNCHitTest);message WM_NCHITTEST;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
{$APPTYPE CONSOLE}
const
  arr:array[-2..21] of string=(
    'HTERROR',
    'HTTRANSPARENT',
    'HTNOWHERE',
    'HTCLIENT - 客户区',
    'HTCAPTION - 标题',
    'HTSYSMENU - 系统菜单',
    'HTGROWBOX',
    'HTMENU - 菜单',
    'HTHSCROLL - 水平滚动条',
    'HTVSCROLL - 垂直滚动条',
    'HTMINBUTTON - 最小化按钮',
    'HTMAXBUTTON - 最大化按钮',
    'HTLEFT - 左边界',
    'HTRIG - 右边界',
    'HTTOP - 上边界',
    'HTTOPLEFT - 左上角',
    'HTTOPRIG - 右上角',
    'HTBOTTOM - 下边界',
    'HTBOTTOMLEFT - 左下角',
    'HTBOTTOMRIG - 右下角',
    'HTBORDER',
    'HTOBJECT',
    'HTCLOSE - 关闭按钮',
    'HTHELP');

{ TForm1 }

procedure TForm1.myMsg(var msg: TWMNCHitTest);
var
  i:integer;
begin
  Inherited;
  i:=msg.Result;
  Writeln(i,arr[i]);
end;

end.

-------------------------------------------

界面代码：

object Form1: TForm1
  Left = 0
  Top = 0
  Width = 271
  Height = 208
  AutoScroll = True
  Caption = 'WM_NCHITTEST'#28040#24687#28436#31034
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  Menu = MainMenu1
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Panel1: TPanel
    Left = 136
    Top = 56
    Width = 153
    Height = 121
    Caption = 'Panel1'
    TabOrder = 0
  end
  object MainMenu1: TMainMenu
    Top = 16
    object file1: TMenuItem
      Caption = 'file'
    end
  end
end

-------------------------------------------

//另附 WM_NCHITTEST 消息中 Result 参数的所有可能值的列表:
HTERROR       = -2;
HTTRANSPARENT = -1;
HTNOWHERE     = 0;
HTCLIENT      = 1;
HTCAPTION     = 2;
HTSYSMENU     = 3;
HTGROWBOX     = 4;
HTSIZE        = HTGROWBOX;
HTMENU        = 5;
HTHSCROLL     = 6;
HTVSCROLL     = 7;
HTMINBUTTON   = 8;
HTMAXBUTTON   = 9;
HTLEFT        = 10;
HTRIGHT       = 11;
HTTOP         = 12;
HTTOPLEFT     = 13;
HTTOPRIGHT    = 14;
HTBOTTOM      = 15;
HTBOTTOMLEFT  = $10;
HTBOTTOMRIGHT = 17;
HTBORDER      = 18;
HTREDUCE      = HTMINBUTTON;
HTZOOM        = HTMAXBUTTON;
HTSIZEFIRST   = HTLEFT;
HTSIZELAST    = HTBOTTOMRIGHT;
HTOBJECT      = 19;
HTCLOSE       = 20;
HTHELP        = 21;

源代码下载：http://www.rayfile.com/files/f4da2347-17e5-11df-9f9d-0015c55db73d/