unitfrmmain.pas

《Delphi百例》源码?禗elphi百例》源码

unit unitFrmMain;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  shlobj, Activex, StdCtrls;
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
    { Private declarations }
    procedure WMShellReg(var Message: TMessage); message WM_SHNOTIFY;
  public
    { Public declarations }
  end;
type PSHNOTIFYSTRUCT = ^SHNOTIFYSTRUCT;
  SHNOTIFYSTRUCT = record
//PItemIDList数据结构指定Windows下的一个"项目"，
//在Windows下资源实现统一管理一个"项目"可以是一个文件或者一个文件夹，
//也可以是一个打印机等资源。
    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 := '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;
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
      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);
    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
//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); //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);
//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
//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 //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;
end.