/* |
File: ReceiveController.m |
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Contains: Manages the receive tab. |
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Written by: DTS |
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Copyright: Copyright (c) 2009-2012 Apple Inc. All Rights Reserved. |
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple 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. |
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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 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. |
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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. |
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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. |
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*/ |
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#import "ReceiveController.h" |
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#import "NetworkManager.h" |
#import "QNetworkAdditions.h" |
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@interface ReceiveController () <NSStreamDelegate> |
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// stuff for IB |
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@property (nonatomic, strong, readwrite) IBOutlet UIImageView * imageView; |
@property (nonatomic, strong, readwrite) IBOutlet UILabel * statusLabel; |
@property (nonatomic, strong, readwrite) IBOutlet UIActivityIndicatorView * activityIndicator; |
@property (nonatomic, strong, readwrite) IBOutlet UIButton * receiveOrCancelButton; |
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- (IBAction)receiveOrCancelAction:(id)sender; |
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// private properties |
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@property (nonatomic, assign, readonly ) BOOL isReceiving; |
@property (nonatomic, strong, readwrite) NSInputStream * networkStream; |
@property (nonatomic, copy, readwrite) NSString * filePath; |
@property (nonatomic, strong, readwrite) NSOutputStream * fileStream; |
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@end |
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@implementation ReceiveController |
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@synthesize networkStream = _networkStream; |
@synthesize filePath = _filePath; |
@synthesize fileStream = _fileStream; |
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@synthesize imageView = _imageView; |
@synthesize statusLabel = _statusLabel; |
@synthesize activityIndicator = _activityIndicator; |
@synthesize receiveOrCancelButton = _receiveOrCancelButton; |
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#pragma mark * Status management |
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// These methods are used by the core transfer code to update the UI. |
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- (void)receiveDidStart |
{ |
// Clear the current image so that we get a nice visual cue if the receive fails. |
self.imageView.image = [UIImage imageNamed:@"NoImage.png"]; |
self.statusLabel.text = @"Receiving"; |
[self.receiveOrCancelButton setTitle:@"Cancel" forState:UIControlStateNormal]; |
[self.activityIndicator startAnimating]; |
[[NetworkManager sharedInstance] didStartNetworkOperation]; |
} |
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- (void)updateStatus:(NSString *)statusString |
{ |
assert(statusString != nil); |
self.statusLabel.text = statusString; |
} |
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- (void)receiveDidStopWithStatus:(NSString *)statusString |
{ |
if (statusString == nil) { |
assert(self.filePath != nil); |
self.imageView.image = [UIImage imageWithContentsOfFile:self.filePath]; |
statusString = @"Receive succeeded"; |
} |
self.statusLabel.text = statusString; |
[self.receiveOrCancelButton setTitle:@"Receive" forState:UIControlStateNormal]; |
[self.activityIndicator stopAnimating]; |
[[NetworkManager sharedInstance] didStopNetworkOperation]; |
} |
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#pragma mark * Core transfer code |
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// This is the code that actually does the networking. |
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- (BOOL)isReceiving |
{ |
return (self.networkStream != nil); |
} |
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- (void)startReceive |
{ |
NSInputStream * input; |
BOOL success; |
NSNetService * netService; |
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assert(self.networkStream == nil); // don't tap receive twice in a row! |
assert(self.fileStream == nil); // ditto |
assert(self.filePath == nil); // ditto |
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// Open a stream for the file we're going to receive into. |
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self.filePath = [[NetworkManager sharedInstance] pathForTemporaryFileWithPrefix:@"Receive"]; |
assert(self.filePath != nil); |
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self.fileStream = [NSOutputStream outputStreamToFileAtPath:self.filePath append:NO]; |
assert(self.fileStream != nil); |
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[self.fileStream open]; |
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// Open a stream to the server, finding the server via Bonjour. Then configure |
// the stream for async operation. |
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netService = [[NSNetService alloc] initWithDomain:@"local." type:@"_x-SNSDownload._tcp." name:@"Test"]; |
assert(netService != nil); |
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// Until <rdar://problem/6868813> is fixed, we have to use our own code to open the streams |
// rather than call -[NSNetService getInputStream:outputStream:]. See the comments in |
// QNetworkAdditions.m for the details. |
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success = [netService qNetworkAdditions_getInputStream:&input outputStream:NULL]; |
assert(success); |
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self.networkStream = input; |
self.networkStream.delegate = self; |
[self.networkStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; |
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[self.networkStream open]; |
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// Tell the UI we're receiving. |
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[self receiveDidStart]; |
} |
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- (void)stopReceiveWithStatus:(NSString *)statusString |
{ |
if (self.networkStream != nil) { |
self.networkStream.delegate = nil; |
[self.networkStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; |
[self.networkStream close]; |
self.networkStream = nil; |
} |
if (self.fileStream != nil) { |
[self.fileStream close]; |
self.fileStream = nil; |
} |
[self receiveDidStopWithStatus:statusString]; |
self.filePath = nil; |
} |
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- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode |
// An NSStream delegate callback that's called when events happen on our |
// network stream. |
{ |
assert(aStream == self.networkStream); |
#pragma unused(aStream) |
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switch (eventCode) { |
case NSStreamEventOpenCompleted: { |
[self updateStatus:@"Opened connection"]; |
} break; |
case NSStreamEventHasBytesAvailable: { |
NSInteger bytesRead; |
uint8_t buffer[32768]; |
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[self updateStatus:@"Receiving"]; |
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// Pull some data off the network. |
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bytesRead = [self.networkStream read:buffer maxLength:sizeof(buffer)]; |
if (bytesRead == -1) { |
[self stopReceiveWithStatus:@"Network read error"]; |
} else if (bytesRead == 0) { |
[self stopReceiveWithStatus:nil]; |
} else { |
NSInteger bytesWritten; |
NSInteger bytesWrittenSoFar; |
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// Write to the file. |
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bytesWrittenSoFar = 0; |
do { |
bytesWritten = [self.fileStream write:&buffer[bytesWrittenSoFar] maxLength:bytesRead - bytesWrittenSoFar]; |
assert(bytesWritten != 0); |
if (bytesWritten == -1) { |
[self stopReceiveWithStatus:@"File write error"]; |
break; |
} else { |
bytesWrittenSoFar += bytesWritten; |
} |
} while (bytesWrittenSoFar != bytesRead); |
} |
} break; |
case NSStreamEventHasSpaceAvailable: { |
assert(NO); // should never happen for the output stream |
} break; |
case NSStreamEventErrorOccurred: { |
[self stopReceiveWithStatus:@"Stream open error"]; |
} break; |
case NSStreamEventEndEncountered: { |
// ignore |
} break; |
default: { |
assert(NO); |
} break; |
} |
} |
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#pragma mark * Actions |
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- (IBAction)receiveOrCancelAction:(id)sender |
{ |
#pragma unused(sender) |
if (self.isReceiving) { |
[self stopReceiveWithStatus:@"Cancelled"]; |
} else { |
[self startReceive]; |
} |
} |
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#pragma mark * View controller boilerplate |
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- (void)viewDidLoad |
{ |
[super viewDidLoad]; |
assert(self.imageView != nil); |
assert(self.statusLabel != nil); |
assert(self.activityIndicator != nil); |
assert(self.receiveOrCancelButton != nil); |
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self.activityIndicator.hidden = YES; |
self.statusLabel.text = @"Tap Receive to start receiving"; |
} |
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- (void)viewDidUnload |
{ |
[super viewDidUnload]; |
self.imageView = nil; |
self.statusLabel = nil; |
self.activityIndicator = nil; |
self.receiveOrCancelButton = nil; |
} |
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- (void)dealloc |
{ |
[self stopReceiveWithStatus:@"Stopped"]; |
} |
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@end |
