需要在 Application.OnMessage 中捕捉消息到处理！！！！！！！！
2. 处理RealPlayer控件的上下文菜单
其实RealPlayer 的“上下文菜单”不是真正意义上的上下文菜单，是一个右键点下菜单。仔细观察，会发现不同于其它控件的上下文菜单。
要想自定义该“上下文菜单”，对PupupMenu赋值，并在Application.OnMessage中进行处理：
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
OleCtrls, RealAudioObjects_TLB, StdCtrls, Menus;
type
TForm1 = class(TForm)
RealAudio1: TRealAudio;
PopupMenu1: TPopupMenu;
aaaa1: TMenuItem;
aaaa2: TMenuItem;
procedure myproc(var Msg:TMsg;var Handled:boolean);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.myproc(var Msg: TMsg
var Handled: boolean);
var
x1,y1,x2,y2,x,y:integer;
b:Boolean;
p:TPoint;
begin
x1:=realAudio1.left;
y1:=realAudio1.top;
x2:=x1+realAudio1.Width;
y2:=y1+realAudio1.height;
p:=ScreenToClient(msg.pt);
x:=p.x;
y:=p.y;
b:=((x>=x1) and (x<=x2) and (y>=y1) and (y<=y2));
if (b) then
begin
if (msg.message=wm_Rbuttondown) then
handled:=true;
if (msg.message=wm_Rbuttonup) then
begin
if assigned(realAudio1.PopupMenu) then
TrackPopupMenu(realAudio1.PopupMenu.Handle,
TPM_LEFTALIGN,msg.pt.x,msg.pt.y,0,handle,nil);
handled:=true;
end;
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
application.OnMessage :=myproc;
end;
end.
]