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| unit AntMediaConnected;
interface
uses Windows, Messages, SysUtils, Classes, Forms, Dialogs;
const
DBT_DEVICEARRIVAL = $8000; // system detected a new device
DBT_DEVICEREMOVECOMPLETE = $8004; // device is gone
DBT_DEVTYP_VOLUME = $00000002; // device volume class
type
PDevBroadcastHdr = ^DEV_BROADCAST_HDR;
PDevBroadcastHeader = PDevBroadcastHdr;
DEV_BROADCAST_HDR = packed record
dbch_size: DWORD;
dbch_devicetype: DWORD;
dbch_reserved: DWORD;
end;
PDevBroadcastVolume = ^DEV_BROADCAST_VOLUME;
DEV_BROADCAST_VOLUME = packed record
dbch_size: DWORD;
dbch_devicetype: DWORD;
dbch_reserved: DWORD;
dbcv_unitmask: DWORD;
dbcv_flags: WORD;
end;
type
TTypeSizeOf = (tsoByte, tsoKiloByte, tsoMegaByte, tsoGigabyte, tsoTeraByte);
TMediaConnected = class(TComponent)
private
FDeviceLetter: Char;
FVolName: Array[0..Max_Path]Of Char;
FileSysName : Array[0..Max_Path]Of Char;
FVolSerial : DWord;
FileMaxLen : DWord;
FileFlags : DWord;
FFreeSpace : double;
FSize : double;
FBusySpace: double;
FWindowHandle: HWND;
FOnUSBArrival: TNotifyEvent;
FOnUSBRemove: TNotifyEvent;
procedure WndProc(var Msg: TMessage);
// function USBRegister: Boolean;
protected
procedure WMDeviceChange(var Msg: TMessage); dynamic;
public
function GetSerialVolume: Cardinal;
function GetNameVolume: String;
function GetFreeSpace(TypeSizeReturn: TTypeSizeOf = tsoByte): Double;
function GetBusySpace(TypeSizeReturn: TTypeSizeOf = tsoByte): Double;
function GetSize(TypeSizeReturn: TTypeSizeOf = tsoByte): Double;
function GetLetterMedia: Char;
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;
implementation
procedure Register;
begin
RegisterComponents('AntFIRST',[TMediaConnected]);
end;
{==============================================================================}
{ TMediaConnected }
{==============================================================================}
function FormatSize(Value: Double; TypeSizeReturn: TTypeSizeOf): Double;
begin
case TypeSizeReturn of
tsoByte: Result := Value / 1024;
tsoKiloByte: Result := Value / 1048576;
tsoMegaByte: Result := Value / 1073741824;
else
Result := Value;
end;
end;
//------------------------------------------------------------------------------
constructor TMediaConnected.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FWindowHandle := AllocateHWnd(WndProc);
//USBRegister;
end;
//------------------------------------------------------------------------------
destructor TMediaConnected.Destroy;
begin
DeallocateHWnd(FWindowHandle);
inherited Destroy;
end;
//------------------------------------------------------------------------------
procedure TMediaConnected.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 TMediaConnected.WMDeviceChange(var Msg: TMessage);
var
PHeader : PDevBroadcastHeader;
PData : PDevBroadcastVolume;
Index : Integer;
begin
inherited;
PHeader:=PDevBroadcastHeader(Msg.lParam);
FDeviceLetter:=#0;
case Msg.WParam of
DBT_DEVICEARRIVAL :
begin
if (PHeader^.dbch_devicetype = DBT_DEVTYP_VOLUME) then
begin
PData:=PDevBroadcastVolume(Msg.lParam);
for Index:=0 to 25 do
if ((PData^.dbcv_unitmask shr Index) = 1) then
begin
FDeviceLetter:=Chr(65+Index);
break;
end;
if GetVolumeInformation(PChar(FDeviceLetter+':\'),FVolName,Max_Path,@FVolSerial, FileMaxLen, FileFlags,FileSysName,Max_Path) then
begin
FFreeSpace:=DiskFree(Ord(FDeviceLetter)-64);
FSize:=DiskSize(Ord(FDeviceLetter)-64);
FBusySpace:= FSize - FFreeSpace;
end;
end;
if Assigned(FOnUSBArrival) then
FOnUSBArrival(Self);
end;
DBT_DEVICEREMOVECOMPLETE:
begin
if (PHeader^.dbch_devicetype = DBT_DEVTYP_VOLUME) then
begin
PData:=PDevBroadcastVolume(Msg.lParam);
for Index:=0 to 25 do
if ((PData^.dbcv_unitmask shr Index) = 1) then
begin
FDeviceLetter:=Chr(65+Index);
break;
end;
end;
if Assigned(FOnUSBRemove) then
FOnUSBRemove(Self);
end;
end;
end;
//------------------------------------------------------------------------------
function TMediaConnected.GetSerialVolume:cardinal;
begin
Result:=FVolSerial;
end;
//------------------------------------------------------------------------------
function TMediaConnected.GetNameVolume:string;
begin
Result:=FVolName;
end;
//------------------------------------------------------------------------------
function TMediaConnected.GetLetterMedia:char;
begin
Result:=FDeviceLetter;
end;
//------------------------------------------------------------------------------
function TMediaConnected.GetFreeSpace(TypeSizeReturn: TTypeSizeOf = tsoByte): Double;
begin
result := FormatSize(FFreeSpace, TypeSizeReturn);
end;
//------------------------------------------------------------------------------
function TMediaConnected.GetBusySpace(TypeSizeReturn: TTypeSizeOf = tsoByte): Double;
begin
result := FormatSize(FBusySpace, TypeSizeReturn);
end;
//------------------------------------------------------------------------------
function TMediaConnected.GetSize(TypeSizeReturn: TTypeSizeOf = tsoByte): Double;
begin
result := FormatSize(FSize, TypeSizeReturn);
end;
end. |
Composant détectant l'insertion d'une clé USB
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