程序编译通过,但按下button后,在注册shell监控时出现错误,错误点我在下面有标记出来!
错误点代码:ps.bWatchSubFolders := 1;
unit unitFrmMain;interfaceuses
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
{$R-}
Result := False;
if m_hSHNotify = 0 then
begin
// 获取桌面文件夹的Pidl
if SHGetSpecialFolderLocation(0, CSIDL_DESKTOP,
m_pidlDesktop) <> NOERROR then
Form1.Close;
if Boolean(m_pidlDesktop) then
begin
ps.bWatchSubFolders := 1;//这里出现错误!!
ps.pidl := m_pidlDesktop; // 利用SHChangeNotifyRegister函数注册系统消息处理
m_hSHNotify := SHChangeNotifyRegister(hWnd,
(SHCNF_TYPE or SHCNF_IDLIST), (SHCNE_ALLEVENTS or SHCNE_INTERRUPT),
WM_SHNOTIFY, 1, ps);
Result := Boolean(m_hSHNotify);
end
else
// 如果出现错误就使用 CoTaskMemFree函数来释放句柄
CoTaskMemFree(m_pidlDesktop);
end;
{$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.
错误点代码:ps.bWatchSubFolders := 1;
unit unitFrmMain;interfaceuses
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
{$R-}
Result := False;
if m_hSHNotify = 0 then
begin
// 获取桌面文件夹的Pidl
if SHGetSpecialFolderLocation(0, CSIDL_DESKTOP,
m_pidlDesktop) <> NOERROR then
Form1.Close;
if Boolean(m_pidlDesktop) then
begin
ps.bWatchSubFolders := 1;//这里出现错误!!
ps.pidl := m_pidlDesktop; // 利用SHChangeNotifyRegister函数注册系统消息处理
m_hSHNotify := SHChangeNotifyRegister(hWnd,
(SHCNF_TYPE or SHCNF_IDLIST), (SHCNE_ALLEVENTS or SHCNE_INTERRUPT),
WM_SHNOTIFY, 1, ps);
Result := Boolean(m_hSHNotify);
end
else
// 如果出现错误就使用 CoTaskMemFree函数来释放句柄
CoTaskMemFree(m_pidlDesktop);
end;
{$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.
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ps^.bWatchSubFolders := 1; ...
Dispose(ps);ps 是一個內存指針, 你沒有分配就付值, 當然會出錯
我用其他程序拷贝,新建文件,它就监视不出来了