CACIC_USB.pas
4.86 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
unit CACIC_USB;
// Código Original obtido em http://www.delphi3000.com/articles/article_4841.asp?SK=
interface
uses Windows, Messages, SysUtils, Classes;
type
{ Event Types }
TOnUsbChangeEvent = procedure(AObject : TObject;
const ADevType,AVendorID,
AProductID : string) of object;
{ USB Class }
TUsbClass = class(TObject)
private
FHandle : HWND;
FOnUsbRemoval,
FOnUsbInsertion : TOnUsbChangeEvent;
procedure GetUsbInfo(const ADeviceString : string;
out ADevType,AVendorID,
AProductID : string);
procedure WinMethod(var AMessage : TMessage);
procedure RegisterUsbHandler;
procedure WMDeviceChange(var AMessage : TMessage);
procedure Split(const Delimiter: Char;Input: string;const Strings: TStrings);
public
constructor Create;
destructor Destroy; override;
property OnUsbInsertion : TOnUsbChangeEvent read FOnUsbInsertion
write FOnUsbInsertion;
property OnUsbRemoval : TOnUsbChangeEvent read FOnUsbRemoval
write FOnUsbRemoval;
end;
// -----------------------------------------------------------------------------
implementation
type
// Win API Definitions
PDevBroadcastDeviceInterface = ^DEV_BROADCAST_DEVICEINTERFACE;
DEV_BROADCAST_DEVICEINTERFACE = record
dbcc_size : DWORD;
dbcc_devicetype : DWORD;
dbcc_reserved : DWORD;
dbcc_classguid : TGUID;
dbcc_name : char;
end;
const
// Miscellaneous
GUID_DEVINTF_USB_DEVICE : TGUID = '{A5DCBF10-6530-11D2-901F-00C04FB951ED}';
USB_INTERFACE = $00000005; // Device interface class
USB_INSERTION = $8000; // System detected a new device
USB_REMOVAL = $8004; // Device is gone
constructor TUsbClass.Create;
begin
inherited Create;
FHandle := AllocateHWnd(WinMethod);
RegisterUsbHandler;
end;
destructor TUsbClass.Destroy;
begin
DeallocateHWnd(FHandle);
inherited Destroy;
end;
procedure TUsbClass.GetUsbInfo(const ADeviceString : string;
out ADevType,AVendorID,
AProductID : string);
var sWork,sKey1 : string;
tstrAUX1,tstrAUX2 : TStringList;
begin
ADevType := '';
AVendorID := '';
AProductID := '';
if ADeviceString <> '' then
Begin
sWork := copy(ADeviceString,pos('#',ADeviceString) + 1,1026);
sKey1 := copy(sWork,1,pos('#',sWork) - 1);
tstrAUX1 := TStringList.Create;
tstrAUX2 := TStringList.Create;
Split('&',sKey1,tstrAUX1);
Split('_',tstrAUX1[0],tstrAUX2);
AVendorID := tstrAUX2[1];
Split('_',tstrAUX1[1],tstrAUX2);
AProductID := tstrAUX2[1];
tstrAUX1.Free;
tstrAUX2.Free;
End;
end;
procedure TUsbClass.Split(const Delimiter: Char;
Input: string;
const Strings: TStrings) ;
begin
Assert(Assigned(Strings)) ;
Strings.Clear;
Strings.Delimiter := Delimiter;
Strings.DelimitedText := Input;
end;
procedure TUsbClass.WMDeviceChange(var AMessage : TMessage);
var iDevType : integer;
sDevString,sDevType,
sVendorID,sProductID : string;
pData : PDevBroadcastDeviceInterface;
begin
if (AMessage.wParam = USB_INSERTION) or
(AMessage.wParam = USB_REMOVAL) then
Begin
pData := PDevBroadcastDeviceInterface(AMessage.LParam);
iDevType := pData^.dbcc_devicetype;
// Se for um dispositivo USB...
if iDevType = USB_INTERFACE then
Begin
sDevString := PChar(@pData^.dbcc_name);
GetUsbInfo(sDevString,sDevType,sVendorID,sProductID);
// O evento é disparado conforme a mensagem
if (AMessage.wParam = USB_INSERTION) and Assigned(FOnUsbInsertion) then
FOnUsbInsertion(self,sDevType,sVendorID,sProductID);
if (AMessage.wParam = USB_REMOVAL) and Assigned(FOnUsbRemoval) then
FOnUsbRemoval(self,sDevType,sVendorID,sProductID);
End;
End;
end;
procedure TUsbClass.WinMethod(var AMessage : TMessage);
begin
if (AMessage.Msg = WM_DEVICECHANGE) then
WMDeviceChange(AMessage)
else
AMessage.Result := DefWindowProc(FHandle,AMessage.Msg,
AMessage.wParam,AMessage.lParam);
end;
procedure TUsbClass.RegisterUsbHandler;
var rDbi : DEV_BROADCAST_DEVICEINTERFACE;
iSize : integer;
begin
iSize := SizeOf(DEV_BROADCAST_DEVICEINTERFACE);
ZeroMemory(@rDbi,iSize);
rDbi.dbcc_size := iSize;
rDbi.dbcc_devicetype := USB_INTERFACE;
rDbi.dbcc_reserved := 0;
rDbi.dbcc_classguid := GUID_DEVINTF_USB_DEVICE;
rDbi.dbcc_name := #0;
RegisterDeviceNotification(FHandle,@rDbi,DEVICE_NOTIFY_WINDOW_HANDLE);
end;
end.