unit unit1;

interface

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

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);
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

{uses
Graphics;
}
{$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 := '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: IDLSTRUCT;
begin
{$R-}
Result := False;
if m_hSHNotify = 0 then
begin
//获取桌面文件夹的Pidl
if SHGetSpecialFolderLocation(0, CSIDL_DESKTOP, m_pidlDesktop) <> NOERROR then
begin
form1.close;
end;
if Boolean(m_pidlDesktop) then
begin
ps.bWatchSubFolders := 1;
ps.pidl := m_pidlDesktop;
// 利用SHChangeNotifyRegister函数注册系统消息处理
m_hSHNotify := SHChangeNotifyRegister(hWnd, (SHCNF_TYPE or SHCNF_IDLIST),
(SHCNE_ALLEVENTS or SHCNE_INTERRUPT),
WM_SHNOTIFY, 1, @ps);
Result := Boolean(m_hSHNotify); //mmmmmmmm
end
else
// 如果出现错误就使用 CoTaskMemFree函数来释放句柄
CoTaskMemFree(m_pidlDesktop);
end;
{$R+ }
end;

function SHNotify_UnRegister: Bool;
begin
Result := False;
if Boolean(m_hSHNotify) then
begin
//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;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
if Boolean(m_pidlDesktop) then
SHNotify_Unregister;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
m_hSHNotify := 0;
if SHNotify_Register(self.Handle) then
begin //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.WMShellReg(var Message: TMessage);
var
strPath1, strPath2: string;
charPath: array[0..259] of char;
pidlItem: PSHNOTIFYSTRUCT;
begin
pidlItem := PSHNOTIFYSTRUCT(Message.wParam);
//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;
end.