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
165
166
167
168
169
|
/* $Id$ */
/***
This file is part of avahi.
avahi is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
avahi is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
using System;
using System.Collections;
using System.Runtime.InteropServices;
namespace Avahi
{
internal delegate void ServiceTypeBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
IntPtr type, IntPtr domain, IntPtr userdata);
public struct ServiceTypeInfo
{
public int NetworkInterface;
public Protocol Protocol;
public string Domain;
public string ServiceType;
}
public delegate void ServiceTypeInfoHandler (object o, ServiceTypeInfo info);
public class ServiceTypeBrowser : IDisposable
{
private IntPtr handle;
private ArrayList infos = new ArrayList ();
private Client client;
private int iface;
private Protocol proto;
private string domain;
private ServiceTypeBrowserCallback cb;
private ArrayList addListeners = new ArrayList ();
private ArrayList removeListeners = new ArrayList ();
[DllImport ("avahi-client")]
private static extern IntPtr avahi_service_type_browser_new (IntPtr client, int iface, int proto,
IntPtr domain, ServiceTypeBrowserCallback cb,
IntPtr userdata);
[DllImport ("avahi-client")]
private static extern void avahi_service_type_browser_free (IntPtr handle);
public event ServiceTypeInfoHandler ServiceTypeAdded
{
add {
addListeners.Add (value);
Start ();
}
remove {
addListeners.Remove (value);
Stop (false);
}
}
public event ServiceTypeInfoHandler ServiceTypeRemoved
{
add {
removeListeners.Add (value);
Start ();
}
remove {
removeListeners.Remove (value);
Stop (false);
}
}
public ServiceTypeInfo[] ServiceTypes
{
get { return (ServiceTypeInfo[]) infos.ToArray (typeof (ServiceTypeInfo)); }
}
public ServiceTypeBrowser (Client client) : this (client, client.DomainName)
{
}
public ServiceTypeBrowser (Client client, string domain) : this (client, -1, Protocol.Unspecified, domain)
{
}
public ServiceTypeBrowser (Client client, int iface, Protocol proto, string domain)
{
this.client = client;
this.iface = iface;
this.proto = proto;
this.domain = domain;
cb = OnServiceTypeBrowserCallback;
}
~ServiceTypeBrowser ()
{
Dispose ();
}
public void Dispose ()
{
Stop (true);
}
private void Start ()
{
if (client.Handle == IntPtr.Zero || handle != IntPtr.Zero ||
(addListeners.Count == 0 && removeListeners.Count == 0))
return;
lock (client) {
IntPtr domainPtr = Utility.StringToPtr (domain);
handle = avahi_service_type_browser_new (client.Handle, iface, (int) proto, domainPtr,
cb, IntPtr.Zero);
Utility.Free (domainPtr);
}
}
private void Stop (bool force)
{
if (client.Handle != IntPtr.Zero && handle != IntPtr.Zero &&
(force || (addListeners.Count == 0 && removeListeners.Count == 0))) {
lock (client) {
avahi_service_type_browser_free (handle);
handle = IntPtr.Zero;
}
}
}
private void OnServiceTypeBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
IntPtr type, IntPtr domain, IntPtr userdata)
{
ServiceTypeInfo info;
info.NetworkInterface = iface;
info.Protocol = proto;
info.Domain = Utility.PtrToString (domain);
info.ServiceType = Utility.PtrToString (type);
infos.Add (info);
if (bevent == BrowserEvent.Added) {
infos.Add (info);
foreach (ServiceTypeInfoHandler handler in addListeners)
handler (this, info);
} else {
infos.Remove (info);
foreach (ServiceTypeInfoHandler handler in removeListeners)
handler (this, info);
}
}
}
}
|
