利用Hook技术实现键盘监控

利用Hook技术实现键盘监控(3) implementation
{$R *.DFM}
function setkeyhook:bool;external 'keyspy.dll';
function endkeyhook:bool;external 'keyspy.dll';

procedure tform1.icontray(var msg:tmessage);
var
pt:tpoint;
begin
if msg.lparam=wm_lbuttondown then
sethook1click(self);
if msg.LParam=wm_rbuttondown then
begin
getcursorpos(pt);
setforegroundwindow(handle);
popupmenu1.popup(pt.x,pt.y);
end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
normalicon:=ticon.create;
application.title:=caption;
nid.cbsize:=sizeof(nid);
nid.wnd:=handle;
nid.uid:=icon_id;
nid.uflags:=nif_icon or nif_message or nif_tip;
nid.UCallbackmessage:=mi_iconevent;
nid.hIcon :=normalicon.handle;
strcopy(nid.sztip,pchar(caption));
nid.uFlags:=nif_message or nif_icon or nif_tip;
shell_notifyicon(nim_add,@nid);
SetWindowLong(Application.Handle,
GWL_EXSTYLE,WS_EX_TOOLWINDOW);
end;

procedure TForm1.sethook1Click(Sender: TObject);
begin
setkeyhook;
end;

procedure TForm1.endhook1Click(Sender: TObject);
begin
endkeyhook;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
nid.uFlags :=0;
shell_notifyicon(nim_delete,@nid);
end;

procedure TForm1.Close1Click(Sender: TObject);
begin
application.terminate;
end;

---- 该程序虽然只用了几个shellai函数，但是它涉及到了在Delphi中对DLL的引用、钩子实现、对指示区的操作、用户定义消息的处理、文件的读写等比较重要的内容，我相信这篇文章能对许多Delphi的初学者有所帮助。
---- 该程序在Win98、Delphi4.0中正常运行。