当一个固定文件夹下多了一个文件，怎样让程序立即知道，并作出响应！

一笑天下而已 2003-12-11 11:18:08

当某个固定目录下，多了一个文件，怎样让程序立即知道，并作出响应！最好不要用Ttimer!

...全文

82 18 打赏收藏转发到动态举报

写回复

用AI写文章

18 条回复

切换为时间正序

请发表友善的回复…

发表回复

zswangII 2003-12-29

打赏
举报

//通过ShellAPI函数来实现比较科学～～
//注册一个事件响应～～
//代码如下～～
unit TestNotify;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ShlObj, ShellAPI;

const
WM_SHNOTIFY = WM_USER + 10;

type
TFormTestNotify = class(TForm)
MemoNotifyLog: TMemo;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
{ Private declarations }
FNotifyHandle: THandle;
procedure WMSHNOTIFY(var Msg: TMessage); message WM_SHNOTIFY;
public
{ Public declarations }
end;

var
FormTestNotify: TFormTestNotify;

implementation

{$R *.dfm}

type
NOTIFYREGISTER = packed record
pidlPath: PItemIDList;
bWatchSubtree: BOOL;
end;
PNotifyRegister = ^NOTIFYREGISTER;

{$WARNINGS OFF}
function SHChangeNotifyRegister(hWnd: HWND; dwFlags: Integer;
wEventMask: Cardinal; uMsg: UINT; cItems: Integer;
lpItems: PNotifyRegister): HWND; stdcall; external Shell32 index 2;

function SHChangeNotifyDeregister(hWnd: HWND): Boolean; stdcall;
external Shell32 index 4;

function SHILCreateFromPath(pszPath: PChar; ppidl: PItemIDList;
rgflnOut: PDWORD): HResult; stdcall; external Shell32 index 28;
{$WARNINGS ON}

procedure TFormTestNotify.FormCreate(Sender: TObject);
var
vNotifyRegister: NOTIFYREGISTER;
vAttributes: WORD;
vItemIDList: PItemIDList;
begin
SHILCreatefromPath('c:\temp', @vItemIDList, @vAttributes);
vNotifyRegister.pidlPath := vItemIDList;
vNotifyRegister.bWatchSubtree := True;

FNotifyHandle := SHChangeNotifyRegister(Handle,
SHCNF_TYPE or SHCNF_IDLIST,
SHCNE_ALLEVENTS or SHCNE_INTERRUPT, WM_SHNOTIFY, 1, @vNotifyRegister);

MemoNotifyLog.Clear;
end;

procedure TFormTestNotify.FormDestroy(Sender: TObject);
begin
SHChangeNotifyDeregister(FNotifyHandle);
end;

procedure TFormTestNotify.WMSHNOTIFY(var Msg: TMessage);
type
PSHNOTIFYSTRUCT = ^SHNOTIFYSTRUCT;
SHNOTIFYSTRUCT = packed record
dwItem1: PItemIDList;
dwItem2: PItemIDList;
end;
var
vBuffer: array[0..MAX_PATH] of Char;
pidlItem: PSHNOTIFYSTRUCT;
S: string;
begin
pidlItem := PSHNOTIFYSTRUCT(Msg.wParam);
SHGetPathFromIDList(pidlItem.dwItem1, vBuffer);
S := vBuffer;
SHGetPathFromIDList(pidlItem.dwItem2, vBuffer);
case Msg.lParam of //根据参数设置提示消息
SHCNE_RENAMEITEM: S := '重命名文件' + S + '为' + vBuffer;
SHCNE_CREATE: S := '建立文件文件名：' + S;
SHCNE_DELETE: S := '删除文件文件名：' + S;
SHCNE_MKDIR: S := '新建目录目录名：' + S;
SHCNE_RMDIR: S := '删除目录目录名：' + S;
SHCNE_MEDIAINSERTED: S := S + '中插入可移动存储介质';
SHCNE_MEDIAREMOVED: S := S + '中移去可移动存储介质' + S + ' ' + vBuffer;
SHCNE_DRIVEREMOVED: S := '移去驱动器' + S;
SHCNE_DRIVEADD: S := '添加驱动器' + S;
SHCNE_NETSHARE: S := '改变目录' + S + '的共享属性';
SHCNE_ATTRIBUTES: S := '改变文件目录属性文件名' + S;
SHCNE_UPDATEDIR: S := '更新目录' + S;
SHCNE_UPDATEITEM: S := '更新文件文件名：' + S;
SHCNE_SERVERDISCONNECT: S := '断开与服务器的连接' + S + ' ' + vBuffer;
SHCNE_UPDATEIMAGE: S := 'SHCNE_UPDATEIMAGE';
SHCNE_DRIVEADDGUI: S := 'SHCNE_DRIVEADDGUI';
SHCNE_RENAMEFOLDER: S := '重命名文件夹' + S + '为' + vBuffer;
SHCNE_FREESPACE: S := '磁盘空间大小改变';
SHCNE_ASSOCCHANGED: S := '改变文件关联';
else S := '未知操作' + IntToStr(Msg.lParam);
end;
MemoNotifyLog.Lines.Add(S);
end;

end.

steventone 2003-12-29

打赏
举报

getfile()
刷新窗体

火猴 2003-12-29

打赏
举报

来学习一下

一笑天下而已 2003-12-29

打赏
举报

谢谢！

一笑天下而已 2003-12-19

打赏
举报

谢谢楼上的各位，有更好的例子吗？

太空11 2003-12-11

打赏
举报

procedure GetFile(ASelector: String; ADestStream: TStream; IsGopherPlus: Boolean; AView: String);

Parameters

ASelector: String

the selector used to retrieve the file.

ADestStream: TStream

DEstination for the retrieved file.

IsGopherPlus: Boolean = False

Server supports Gopher+. Default value is False.

AView: String = ''

Alternate view listed. Default value is ''.