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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/* -*- Mode: C; tab-width: 4 -*-
*
* Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "stdafx.h"
#include <assert.h>
#include <stdio.h>
#include "dns_sd.h"
// Constants
#define BONJOUR_EVENT ( WM_USER + 0x100 ) // Message sent to the Window when a Bonjour event occurs.
// Prototypes
static LRESULT CALLBACK WndProc( HWND inWindow, UINT inMsg, WPARAM inWParam, LPARAM inLParam );
static void DNSSD_API
BrowserCallBack(
DNSServiceRef inServiceRef,
DNSServiceFlags inFlags,
uint32_t inIFI,
DNSServiceErrorType inError,
const char * inName,
const char * inType,
const char * inDomain,
void * inContext );
// Globals
DNSServiceRef gServiceRef = NULL;
// Main entry point for application.
int _tmain( int argc, _TCHAR *argv[] )
{
HINSTANCE instance;
WNDCLASSEX wcex;
HWND wind;
MSG msg;
DNSServiceErrorType err;
(void) argc; // Unused
(void) argv; // Unused
// Create the window. This window won't actually be shown, but it demonstrates how to use Bonjour
// with Windows GUI applications by having Bonjour events processed as messages to a Window.
instance = GetModuleHandle( NULL );
assert( instance );
wcex.cbSize = sizeof( wcex );
wcex.style = 0;
wcex.lpfnWndProc = (WNDPROC) WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = instance;
wcex.hIcon = NULL;
wcex.hCursor = NULL;
wcex.hbrBackground = NULL;
wcex.lpszMenuName = NULL;
wcex.lpszClassName = TEXT( "BonjourExample" );
wcex.hIconSm = NULL;
RegisterClassEx( &wcex );
wind = CreateWindow( wcex.lpszClassName, wcex.lpszClassName, 0, CW_USEDEFAULT, 0, CW_USEDEFAULT,
0, NULL, NULL, instance, NULL );
assert( wind );
// Start browsing for services and associate the Bonjour browser with our window using the
// WSAAsyncSelect mechanism. Whenever something related to the Bonjour browser occurs, our
// private Windows message will be sent to our window so we can give Bonjour a chance to
// process it. This allows Bonjour to avoid using a secondary thread (and all the issues
// with synchronization that would introduce), but still process everything asynchronously.
// This also simplifies app code because Bonjour will only run when we explicitly call it.
err = DNSServiceBrowse(
&gServiceRef, // Receives reference to Bonjour browser object.
0, // No flags.
kDNSServiceInterfaceIndexAny, // Browse on all network interfaces.
"_http._tcp", // Browse for HTTP service types.
NULL, // Browse on the default domain (e.g. local.).
BrowserCallBack, // Callback function when Bonjour events occur.
NULL ); // No callback context needed.
assert( err == kDNSServiceErr_NoError );
err = WSAAsyncSelect( (SOCKET) DNSServiceRefSockFD( gServiceRef ), wind, BONJOUR_EVENT, FD_READ | FD_CLOSE );
assert( err == kDNSServiceErr_NoError );
fprintf( stderr, "Browsing for _http._tcp\n" );
// Main event loop for the application. All Bonjour events are dispatched while in this loop.
while( GetMessage( &msg, NULL, 0, 0 ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
// Clean up Bonjour. This is not strictly necessary since the normal process cleanup will
// close Bonjour socket(s) and release memory, but it's here to demonstrate how to do it.
if( gServiceRef )
{
WSAAsyncSelect( (SOCKET) DNSServiceRefSockFD( gServiceRef ), wind, BONJOUR_EVENT, 0 );
DNSServiceRefDeallocate( gServiceRef );
}
return( 0 );
}
// Callback for the Window. Bonjour events are delivered here.
static LRESULT CALLBACK WndProc( HWND inWindow, UINT inMsg, WPARAM inWParam, LPARAM inLParam )
{
LRESULT result;
DNSServiceErrorType err;
switch( inMsg )
{
case BONJOUR_EVENT:
// Process the Bonjour event. All Bonjour callbacks occur from within this function.
// If an error occurs while trying to process the result, it most likely means that
// something serious has gone wrong with Bonjour, such as it being terminated. This
// does not normally occur, but code should be prepared to handle it. If the error
// is ignored, the window will receive a constant stream of BONJOUR_EVENT messages so
// if an error occurs, we disassociate the DNSServiceRef from the window, deallocate
// it, and invalidate the reference so we don't try to deallocate it again on quit.
// Since this is a simple example app, if this error occurs, we quit the app too.
err = DNSServiceProcessResult( gServiceRef );
if( err != kDNSServiceErr_NoError )
{
fprintf( stderr, "### ERROR! serious Bonjour error: %d\n", err );
WSAAsyncSelect( (SOCKET) DNSServiceRefSockFD( gServiceRef ), inWindow, BONJOUR_EVENT, 0 );
DNSServiceRefDeallocate( gServiceRef );
gServiceRef = NULL;
PostQuitMessage( 0 );
}
result = 0;
break;
default:
result = DefWindowProc( inWindow, inMsg, inWParam, inLParam );
break;
}
return( result );
}
// Callback for Bonjour browser events. Called when services are added or removed.
static void DNSSD_API
BrowserCallBack(
DNSServiceRef inServiceRef,
DNSServiceFlags inFlags,
uint32_t inIFI,
DNSServiceErrorType inError,
const char * inName,
const char * inType,
const char * inDomain,
void * inContext )
{
(void) inServiceRef; // Unused
(void) inContext; // Unused
if( inError == kDNSServiceErr_NoError )
{
const char * action;
const char * more;
if( inFlags & kDNSServiceFlagsAdd ) action = "ADD";
else action = "RMV";
if( inFlags & kDNSServiceFlagsMoreComing ) more = " (MORE)";
else more = "";
fprintf( stderr, "%s %30s.%s%s on interface %d%s\n", action, inName, inType, inDomain, (int) inIFI, more );
}
else
{
fprintf( stderr, "Bonjour browser error occurred: %d\n", inError );
}
}
|
