unit Unit2;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, shlobj, activex, StdCtrls, FileCtrl,strUtils;

const
shcne_renameitem = $1;
shcne_create = $2;
shcne_delete = $4;
shcne_mkdir = $8;
shcne_rmdir = $10;
shcne_mediainserted = $20;
shcne_mediaremoved = $40;
shcne_driveremoved = $80;
shcne_driveadd = $100;
shcne_netshare = $200;
shcne_netunshare = $400;
shcne_attributes = $800;
shcne_updatedir = $1000;
shcne_updateitem = $2000;
shcne_serverdisconnect = $4000;
shcne_updateimage = $8000;
shcne_driveaddgui = $10000;
shcne_renamefolder = $20000;
shcne_freespace = $40000;
shcne_assocchanged = $8000000;
shcne_diskevents = $2381F;
shcne_globalevents = $C0581E0;
shcne_allevents = $7FFFFFFF;
shcne_interrupt = $80000000;

shcnf_idlist = 0; //  lpitemidlist
  shcnf_patha = $1; // path name
  shcnf_printera = $2; // printer friendly name
  shcnf_dword = $3; // dword
  shcnf_pathw = $5; // path name
  shcnf_printerw = $6; // printer friendly name
  shcnf_type = $FF;

shcnf_flush = $1000;

shcnf_flushnowait = $2000;
shcnf_path = shcnf_pathw;
shcnf_printer = shcnf_printerw;

wm_shnotify = $401;
noerror = 0;


type
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
DirectoryListBox1: TDirectoryListBox;
DriveComboBox1: TDriveComboBox;
Label1: TLabel;
Button2: TButton;
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
procedure wmshellreg(var message: tmessage); message wm_shnotify;

public
{ Public declarations }
end;

type pshnotifystruct = ^shnotifystruct;
shnotifystruct = record
dwitem1: pitemidlist;
dwitem2: pitemidlist;
end;

type pshfileinfobyte = ^shfileinfobyte;
_shfileinfobyte = record
hicon: integer;
iicon: integer;
dwattributes: integer;
szdisplayname: array[0..259] of char;
sztypename: array[0..79] of char;
end;
shfileinfobyte = _shfileinfobyte;

type pidlstruct = ^idlstruct;
_idlstruct = record
pidl: pitemidlist;
bwatchsubfolders: integer;
end;
idlstruct = _idlstruct;


function shnotify_register(hwnd: integer): bool;
function shnotify_unregister: bool;
function sheventname(strpath1, strpath2: string; lparam: integer): string;

function shchangenotifyderegister(hnotify: integer): integer; stdcall;
external ''shell32.dll'' index 4;
function shchangenotifyregister(hwnd, uflags, dweventid, umsg, citems: longword;
lpps: pidlstruct): integer; stdcall; external ''shell32.dll'' index 2;
function shgetfileinfopidl(pidl: pitemidlist;
dwfileattributes: integer;
psfib: pshfileinfobyte;
cbfileinfo: integer;
uflags: integer): integer; stdcall;
external ''shell32.dll'' name ''shgetfileinfoa'';


var
Form1: TForm1;
m_hshnotify: integer;
m_pidldesktop: pitemidlist;


implementation

{$R *.dfm}

function sheventname(strpath1, strpath2: string; lparam: integer): string;
var
sevent: string;
begin
  case lparam of //根据参数设置提示消息
    shcne_renameitem: sevent := ''rename'' + strpath1 + '':'' + strpath2;
  shcne_create: sevent := ''建立文件 文件名：'' + strpath1;
  shcne_delete: sevent := ''删除文件 文件名：'' + strpath1;
  shcne_mkdir: sevent := ''新建目录 目录名：'' + strpath1;
  shcne_rmdir: sevent := ''删除目录 目录名：'' + strpath1;
  shcne_mediainserted: sevent := strpath1 + ''中插入可移动存储介质'';
  shcne_mediaremoved: sevent := strpath1 + ''中移去可移动存储介质'' + strpath1 + '' '' + strpath2;
  shcne_driveremoved: sevent := ''移去驱动器'' + strpath1;
  shcne_driveadd: sevent := ''添加驱动器'' + strpath1;
  shcne_netshare: sevent := ''改变目录'' + strpath1 + ''的共享属性'';
  
  shcne_attributes: sevent := ''改变文件目录属性 文件名'' + strpath1;
  shcne_updatedir: sevent := ''更新目录'' + strpath1;
  shcne_updateitem: sevent := ''更新文件 文件名：'' + strpath1;
  shcne_serverdisconnect: sevent := ''断开与服务器的连接'' + strpath1 + '' '' + strpath2;
  shcne_updateimage: sevent := ''shcne_updateimage'';
  shcne_driveaddgui: sevent := ''shcne_driveaddgui'';
  shcne_renamefolder: sevent := ''重命名文件夹'' + strpath1 + ''为'' + strpath2;
  shcne_freespace: sevent := ''磁盘空间大小改变'';
  shcne_assocchanged: sevent := ''改变文件关联'';
  else
  sevent := ''未知操作'' + inttostr(lparam);
end;
result := sevent;
end;

function shnotify_register(hwnd: integer): bool;
var
ps: pidlstruct;
begin
  {$R-}
  result := false;
  if m_hshnotify = 0 then begin
    //获取桌面文件夹的pidl
    if shgetspecialfolderlocation(0, CSIDL_DESKTOP, m_pidldesktop) <> noerror then
    form1.close;
    if boolean(m_pidldesktop) then begin
      new(ps);
      try
        ps.bwatchsubfolders := 1;
        ps.pidl := m_pidldesktop;
        
        // 利用shchangenotifyregister函数注册系统消息处理
        m_hshnotify := shchangenotifyregister(hwnd, (shcnf_type or shcnf_idlist),
        (shcne_allevents or shcne_interrupt),
        wm_shnotify, 1, ps);
        result := boolean(m_hshnotify);
        finally
          FreeMem(ps);
        end;
      end
      else
      // 如果出现错误就使用 cotaskmemfree函数来释放句柄
      cotaskmemfree(m_pidldesktop);
    end;
  &nbs