Ancillary Code/QNetworkAdditions.m
/* |
File: QNetworkAdditions.m |
Contains: Works around various NSNetService problems. |
Written by: DTS |
Copyright: Copyright (c) 2012 Apple Inc. All Rights Reserved. |
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*/ |
#import "QNetworkAdditions.h" |
@implementation NSNetService (QNetworkAdditions) |
- (BOOL)qNetworkAdditions_getInputStream:(out NSInputStream **)inputStreamPtr |
outputStream:(out NSOutputStream **)outputStreamPtr |
// The following works around three problems with -[NSNetService getInputStream:outputStream:]: |
// |
// o <rdar://problem/6868813> -- Currently the returns the streams with |
// +1 retain count, which is counter to Cocoa conventions and results in |
// leaks when you use it in ARC code. |
// |
// o <rdar://problem/9821932> -- If you create two pairs of streams from |
// one NSNetService and then attempt to open all the streams simultaneously, |
// some of the streams might fail to open. |
// |
// o <rdar://problem/9856751> -- If you create streams using |
// -[NSNetService getInputStream:outputStream:], start to open them, and |
// then release the last reference to the original NSNetService, the |
// streams never finish opening. This problem is exacerbated under ARC |
// because ARC is better about keeping things out of the autorelease pool. |
{ |
BOOL result; |
CFReadStreamRef readStream; |
CFWriteStreamRef writeStream; |
result = NO; |
readStream = NULL; |
writeStream = NULL; |
if ( (inputStreamPtr != NULL) || (outputStreamPtr != NULL) ) { |
CFNetServiceRef netService; |
netService = CFNetServiceCreate( |
NULL, |
(__bridge CFStringRef) [self domain], |
(__bridge CFStringRef) [self type], |
(__bridge CFStringRef) [self name], |
0 |
); |
if (netService != NULL) { |
CFStreamCreatePairWithSocketToNetService( |
NULL, |
netService, |
((inputStreamPtr != nil) ? &readStream : NULL), |
((outputStreamPtr != nil) ? &writeStream : NULL) |
); |
CFRelease(netService); |
} |
// We have failed if the client requested an input stream and didn't |
// get one, or requested an output stream and didn't get one. We also |
// fail if the client requested neither the input nor the output |
// stream, but we don't get here in that case. |
result = ! ((( inputStreamPtr != NULL) && ( readStream == NULL)) || |
((outputStreamPtr != NULL) && (writeStream == NULL))); |
} |
if (inputStreamPtr != NULL) { |
*inputStreamPtr = CFBridgingRelease(readStream); |
} |
if (outputStreamPtr != NULL) { |
*outputStreamPtr = CFBridgingRelease(writeStream); |
} |
return result; |
} |
@end |
Copyright © 2012 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2012-05-09