如何获取U盘插入的事件和盘符?关键是盘符的获取
有些U盘 如装有U3 等U盘辅助工具的, 会产生一个虚拟盘,造成混乱.
有些U盘 如装有U3 等U盘辅助工具的, 会产生一个虚拟盘,造成混乱.
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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.
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, AppEvnts, ExtCtrls, StdCtrls;
type
TForm1 = class(TForm)
Label1: TLabel;
private
{ Private declarations }
procedure WMDeviceChange(var Msg:TMessage);message WM_DEVICECHANGE;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.WMDeviceChange(var Msg:TMessage);
var
myMsg: String;
begin
Case Msg.WParam of
32768:
begin
myMsg := 'U盘插入';
lbl1.Caption := myMsg;
end;
32772:
begin
myMsg := 'U盘拔出';
lbl1.Caption := myMsg;
end;
end;
end;
这个是获取优盘盘符的代码
procedure TForm1.FormCreate(Sender: TObject);
var
buf:array [0..MAX_PATH-1] of char;
m_Result:Integer;
i:Integer;
str_temp:string;
begin
m_Result:=GetLogicalDriveStrings(MAX_PATH,buf);
for i:=0 to (m_Result div 4) do
begin
str_temp:=string(buf[i*4]+buf[i*4+1]+buf[i*4+2]);
if getdrivetype(pchar(str_temp)) = DRIVE_REMOVABLE then
begin
showmessage(str_temp+’盘为U盘’);
ListBox1.Items.Add(str_temp);
end;
end;
Windows, Messages, SysUtils, Classes, Forms;type
PDevBroadcastHdr = ^DEV_BROADCAST_HDR;
DEV_BROADCAST_HDR = packed record
dbch_size: DWORD;
dbch_devicetype: DWORD;
dbch_reserved: DWORD;
end; PDevBroadcastDeviceInterface = ^DEV_BROADCAST_DEVICEINTERFACE;
DEV_BROADCAST_DEVICEINTERFACE = record
dbcc_size: DWORD;
dbcc_devicetype: DWORD;
dbcc_reserved: DWORD;
dbcc_classguid: TGUID;
dbcc_name: short;
end;const
GUID_DEVINTERFACE_USB_DEVICE: TGUID = '{A5DCBF10-6530-11D2-901F-00C04FB951ED}';
DBT_DEVICEARRIVAL = $8000; // system detected a new device
DBT_DEVICEREMOVECOMPLETE = $8004; // device is gone
DBT_DEVTYP_DEVICEINTERFACE = $00000005; // device interface class
type
TComponentUSB = class(TComponent)
private
FWindowHandle: HWND;
FOnUSBArrival: TNotifyEvent;
FOnUSBRemove: TNotifyEvent;
procedure WndProc(var Msg: TMessage);
function USBRegister: Boolean;
protected
procedure WMDeviceChange(var Msg: TMessage); dynamic;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
published
property OnUSBArrival: TNotifyEvent read FOnUSBArrival write FOnUSBArrival;
property OnUSBRemove: TNotifyEvent read FOnUSBRemove write FOnUSBRemove;
end;procedure Register;implementationprocedure Register;
begin
RegisterComponents('GrayStorm', [TComponentUSB]);
end;constructor TComponentUSB.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FWindowHandle := AllocateHWnd(WndProc);
USBRegister;
end;destructor TComponentUSB.Destroy;
begin
DeallocateHWnd(FWindowHandle);
inherited Destroy;
end;procedure TComponentUSB.WndProc(var Msg: TMessage);
begin
if (Msg.Msg = WM_DEVICECHANGE) then
begin
try
WMDeviceChange(Msg);
except
Application.HandleException(Self);
end;
end
else Msg.Result := DefWindowProc(FWindowHandle, Msg.Msg, Msg.wParam, Msg.lParam);
end;procedure TComponentUSB.WMDeviceChange(var Msg: TMessage);
var
devType: Integer;
Datos: PDevBroadcastHdr;
begin
if (Msg.wParam = DBT_DEVICEARRIVAL) or (Msg.wParam = DBT_DEVICEREMOVECOMPLETE) then
begin
Datos := PDevBroadcastHdr(Msg.lParam);
devType := Datos^.dbch_devicetype;
if devType = DBT_DEVTYP_DEVICEINTERFACE then
begin // USB Device
if Msg.wParam = DBT_DEVICEARRIVAL then
begin
if Assigned(FOnUSBArrival) then
FOnUSBArrival(Self);
end
else begin
if Assigned(FOnUSBRemove) then
FOnUSBRemove(Self);
end;
end;
end;
end;function TComponentUSB.USBRegister: Boolean;
var
dbi: DEV_BROADCAST_DEVICEINTERFACE;
Size: Integer;
r: Pointer;
begin
Result := False;
Size := SizeOf(DEV_BROADCAST_DEVICEINTERFACE);
ZeroMemory(@dbi, Size);
dbi.dbcc_size := Size;
dbi.dbcc_devicetype := DBT_DEVTYP_DEVICEINTERFACE;
dbi.dbcc_reserved := 0;
dbi.dbcc_classguid := GUID_DEVINTERFACE_USB_DEVICE;
dbi.dbcc_name := 0; r := RegisterDeviceNotification(FWindowHandle, @dbi, DEVICE_NOTIFY_WINDOW_HANDLE);
if Assigned(r) then Result := true;
end;
end.这个挺好用的。嘿嘿
GetDriveType(
lpRootPathName: PChar {磁盘根目录}
): UINT;//返回值:
DRIVE_UNKNOWN = 0; {未知}
DRIVE_NO_ROOT_DIR = 1; {可移动磁盘}
DRIVE_REMOVABLE = 2; {软盘}
DRIVE_FIXED = 3; {本地硬盘}
DRIVE_REMOTE = 4; {网络磁盘}
DRIVE_CDROM = 5; {CD-ROM}
DRIVE_RAMDISK = 6; {RAM 磁盘}
下面是从1-26个字母作为盘符,检测是否存在,然后你可以再判断返回值是否是可移动磁盘用来获得盘符!var
Drives: DWord;
i: Integer;
c: Cardinal;
s:string;
begin
Drives := GetLogicalDrives;
Memo1.Clear;
for i := 0 to 25 do {检测26个字母共盘符}
if LongBool(Drives and ($0001 shl i)) = True then
c := GetDriveType(Char(Ord('A')+i));
if IntToStr(c)=1 then //如果是1,则是移动磁盘!
Memo1.Lines.Add(Char(Ord('A')+i) + ':\');
end;U盘就是可移动磁盘了。。返回1