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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<td><h1><div id="pagehead">PictureSharing</div></h1></td>
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<h2>/PicSharingController.m</h2>
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<p><strong><a href="PictureSharing.zip">Download Sample</a></strong> (“PictureSharing.zip”, 50.2K)<BR>
<strong><a href="PictureSharing.dmg">Download Sample</a></strong> (“PictureSharing.dmg”, 97.2K)</p>
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<pre class="sourcecodebox">/*
File: PicSharingController.m
Abstract: NSObject subclass showing the use of NSNetServices to advertise a
lightweight thumbnail sharing service on the network.
Copyright: (c) Copyright 2003-2005 Apple Computer, Inc. All rights reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under Apple's
copyrights in this original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or implied,
are granted by Apple herein, including but not limited to any patent rights that
may be infringed by your derivative works or by other works in which the Apple
Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Change History (most recent first):
2/11/05 1.1
2/14/03 1.0d1
*/
#import "PicSharingController.h"
// imports required for socket initialization
#import <sys/socket.h>
#import <netinet/in.h>
#import <unistd.h>
@implementation PicSharingController
- (IBAction)toggleSharing:(id)sender {
uint16_t chosenPort;
if(!listeningSocket) {
// Here, create the socket from traditional BSD socket calls, and then set up an NSFileHandle with
//that to listen for incoming connections.
int fdForListening;
struct sockaddr_in serverAddress;
int namelen = sizeof(serverAddress);
// In order to use NSFileHandle's acceptConnectionInBackgroundAndNotify method, we need to create a
// file descriptor that is itself a socket, bind that socket, and then set it up for listening. At this
// point, it's ready to be handed off to acceptConnectionInBackgroundAndNotify.
if((fdForListening = socket(AF_INET, SOCK_STREAM, 0)) > 0) {
memset(&serverAddress, 0, sizeof(serverAddress));
serverAddress.sin_family = AF_INET;
serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
serverAddress.sin_port = 0;
// Allow the kernel to choose a random port number by passing in 0 for the port.
if (bind(fdForListening, (struct sockaddr *)&serverAddress, namelen) < 0) {
close (fdForListening);
return;
}
// Find out what port number was chosen.
if (getsockname(fdForListening, (struct sockaddr *)&serverAddress, &namelen) < 0) {
close(fdForListening);
return;
}
chosenPort = ntohs(serverAddress.sin_port);
// Once we're here, we know bind must have returned, so we can start the listen
if(listen(fdForListening, 1) == 0) {
listeningSocket = [[NSFileHandle alloc] initWithFileDescriptor:fdForListening closeOnDealloc:YES];
}
}
}
if(!netService) {
// lazily instantiate the NSNetService object that will advertise on our behalf. Passing in "" for the domain causes the service
// to be registered in the default registration domain, which will currently always be "local"
netService = [[NSNetService alloc] initWithDomain:@"" type:@"_wwdcpic._tcp." name:[serviceNameField stringValue] port:chosenPort];
[netService setDelegate:self];
}
if(netService && listeningSocket) {
if([[sender title] isEqual:@"Start"]) {
numberOfDownloads = 0;
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(connectionReceived:) name:NSFileHandleConnectionAcceptedNotification object:listeningSocket];
[listeningSocket acceptConnectionInBackgroundAndNotify];
[netService publish];
[serviceNameField setEnabled:NO];
} else {
[serviceNameField setEnabled:YES];
[netService stop];
[[NSNotificationCenter defaultCenter] removeObserver:self name:NSFileHandleConnectionAcceptedNotification object:listeningSocket];
// There is at present no way to get an NSFileHandle to -stop- listening for events, so we'll just have to tear it down and recreate it the next time we need it.
[listeningSocket release];
listeningSocket = nil;
}
}
}
- (void)awakeFromNib {
NSImage * picture;
picture = [[NSImage alloc] initWithContentsOfFile:[NSString stringWithFormat:@"/Library/Desktop Pictures/Nature/Dew Drop.jpg"]];
if(picture) [imageView setImage:picture];
[picture release];
// Set up a default name for the picture service. The user should change this, but it's not a big deal.
[serviceNameField setStringValue:@"Just another picture service"];
[[NSApplication sharedApplication] setDelegate: self];
}
- (IBAction)popupChangedPicture:(id)sender {
NSImage * picture;
picture = [[NSImage alloc] initWithContentsOfFile:[NSString stringWithFormat:@"/Library/Desktop Pictures/Nature/%@.jpg", [[sender selectedItem] title]]];
if (picture) [imageView setImage:picture];
[picture release];
}
// This object is the delegate of the NSApplication instance so we can get notifications about various states.
// Here, the NSApplication shared instance is asking if and when we should terminate. By listening for this
// message, we can stop the service cleanly, and then indicate to the NSApplication instance that it's all right
// to quit immediately.
- (NSApplicationTerminateReply) applicationShouldTerminate:(NSApplication *)sender {
if(netService) [netService stop];
return NSTerminateNow;
}
// This object is the delegate of its NSNetService. It should implement the NSNetServiceDelegateMethods that
// are relevant for publication (see NSNetServices.h).
- (void)netServiceWillPublish:(NSNetService *)sender {
[toggleSharingButton setTitle:@"Stop"];
[shortStatusText setStringValue:@"Picture Sharing is on."];
[longerStatusText setStringValue:@"Click Stop to turn off Picture Sharing."];
}
- (void)netService:(NSNetService *)sender didNotPublish:(NSDictionary *)errorDict {
// Display some meaningful error message here, using the longerStatusText as the explanation.
[toggleSharingButton setTitle:@"Start"];
[shortStatusText setStringValue:@"Picture Sharing is off."];
if([[errorDict objectForKey:NSNetServicesErrorCode] intValue] == NSNetServicesCollisionError) {
[longerStatusText setStringValue:@"A name collision occurred. A service is already running with that name someplace else."];
[serviceNameField setEnabled:YES];
} else {
[longerStatusText setStringValue:@"Some other unknown error occurred."];
}
[listeningSocket release];
listeningSocket = nil;
[netService release];
netService = nil;
}
- (void)netServiceDidStop:(NSNetService *)sender {
[toggleSharingButton setTitle:@"Start"];
[shortStatusText setStringValue:@"Picture Sharing is off."];
[longerStatusText setStringValue:@"Click Start to turn on Picture Sharing and allow other users to see a thumbnail of the picture below."];
// We'll need to release the NSNetService sending this, since we want to recreate it in sync with the socket
// at the other end. Since there's only the one NSNetService in this application, we can just release it.
[netService release];
netService = nil;
}
// This object is also listening for notifications from its NSFileHandle. When an incoming connection is seen
// by the listeningSocket object, we get the NSFileHandle representing the near end of the connection. We write
// the thumbnail image to this NSFileHandle instance.
- (void)connectionReceived:(NSNotification *)aNotification {
NSFileHandle * incomingConnection = [[aNotification userInfo] objectForKey:NSFileHandleNotificationFileHandleItem];
NSData * representationToSend = [[imageView image] TIFFRepresentation];
[[aNotification object] acceptConnectionInBackgroundAndNotify];
[incomingConnection writeData:representationToSend];
[incomingConnection closeFile];
numberOfDownloads++;
[longerStatusText setStringValue:[NSString stringWithFormat:@"Click Stop to turn off Picture Sharing.\nNumber of downloads this session: %d.", numberOfDownloads]];
}
@end</pre>
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