unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,
  shlobj, Activex;

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;
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    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 //file://根据参数设置提示消息
    SHCNE_RENAMEITEM: sEvent := ‘重命名文件‘+strPath1+‘为‘+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;
  ps :IDLSTRUCT;
begin
  {$R-}
  Result:=False;
  If m_hSHNotify = 0 then
  begin
    //file://获取桌面文件夹的Pidl
    if SHGetSpecialFolderLocation(0, CSIDL_DESKTOP,
    m_pidlDesktop)<> NOERROR then
      Form1.close;
    if Boolean(m_pidlDesktop) then
    begin
      ps.bWatchSubFolders := 1;
      ps.pidl := m_pidlDesktop;
      // 利用SHChangeNotifyRegister函数注册系统消息处理
      m_hSHNotify := SHChangeNotifyRegister(
        hWnd,
        (SHCNF_TYPE Or SHCNF_IDLIST),
        (SHCNE_ALLEVENTS Or SHCNE_INTERRUPT),
        //WM_SHNOTIFY, 1, ps);
        WM_SHNOTIFY, 1, @ps);
      Result := Boolean(m_hSHNotify);
    end
    Else
    // 如果出现错误就使用 CoTaskMemFree函数来释放句柄
    CoTaskMemFree(m_pidlDesktop);
  End;
  {$R+}
end;
function SHNotify_UnRegister:Bool;
begin
  Result:=False;
  If Boolean(m_hSHNotify) Then
    //file://取消系统消息监视，同时释放桌面的Pidl
    If Boolean(SHChangeNotifyDeregister(m_hSHNotify)) Then
    begin
      {$R-}
      m_hSHNotify := 0;
      CoTaskMemFree(m_pidlDesktop);
      Result := True;
      {$R-}
    End;
end;

procedure TForm1.WMShellReg(var Message:TMessage); //file://系统消息处理函数
var
  strPath1,strPath2:String;
  charPath:array[0..259]of char;
  pidlItem:PSHNOTIFYSTRUCT;
begin
  pidlItem:=PSHNOTIFYSTRUCT(Message.wParam);
  //file://获得系统消息相关得路径
  SHGetPathFromIDList(pidlItem.dwItem1,charPath);
  strPath1:=charPath;
  SHGetPathFromIDList(pidlItem.dwItem2,charPath);
  strPath2:=charPath;
  Memo1.Lines.Add(SHEvEntName(strPath1,strPath2,Message.lParam)+chr(13)+chr(10));
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  //file://在程序退出的同时删除监视
  if Boolean(m_pidlDesktop) then
    SHNotify_Unregister;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  m_hSHNotify:=0;
  if SHNotify_Register(Form1.Handle) then begin// file://注册Shell监视
    ShowMessage(‘Shell监视程序成功注册‘);
    Button1.Enabled := False;
  end
  else
    ShowMessage(‘Shell监视程序注册失败‘);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Button1.Caption := ‘打开监视‘;
end;

end.