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[英]How does didAcceptConnectionWithInputStream:outputStream: get called?
[英]NSNetService publishes, but didAcceptConnectionWithInputStream… is never called
我一直在尝试在iOS上制作一个简单的应用程序,该应用程序将收到一条消息,然后根据该消息执行操作(此刻,我只想通过NSLog
进行显示)。 我可以连接到该服务,但是该服务似乎从未收到任何东西。 这是我的.h文件:
#import <Foundation/Foundation.h>
#import <arpa/inet.h>
@interface PalServiceController : NSObject <NSNetServiceDelegate>
@property (nonatomic, strong) NSNetService *ns;
@property (nonatomic, strong) NSOutputStream *ostream;
- (void)start;
+ (int)getPort;
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode;
@end
和我的.m:
#import "PalServiceController.h"
@implementation PalServiceController
- (void)start
{
// Start a net service
int port = [PalServiceController getPort];
NSLog(@"Opening on port %i", port);
self.ns = [[NSNetService alloc] initWithDomain:@""
type:@"_TestingProtocol._tcp."
name:@"Test Name For iPhone"
port:port];
if (self.ns) {
[self.ns setDelegate:self];
[self.ns publish];
self.ns.delegate = self;
} else {
NSLog(@"Error starting service");
}
}
/*
* Code from: http://stackoverflow.com/a/11723158/657676
*/
+ (int) getPort
{
...
}
- (void)netServiceWillResolve:(NSNetService *)sender
{
NSLog(@"Resolving");
}
- (void)netServiceDidResolveAddress:(NSNetService *)sender
{
NSLog(@"Resolved Address");
}
- (void)netService:(NSNetService *)sender didNotPublish:(NSDictionary *)errorDict
{
NSLog(@"Error publishing");
}
- (void)netService:(NSNetService *)sender didAcceptConnectionWithInputStream:(NSInputStream *)inputStream outputStream:(NSOutputStream *)outputStream
{
NSLog(@"Got a connection! (server)");
// Close self down
[self.ns stopMonitoring];
[self.ns stop];
}
- (void)netService:(NSNetService *)sender didNotResolve:(NSDictionary *)errorDict
{
NSLog(@"Error resolving");
}
- (void)netServiceDidPublish:(NSNetService *)sender
{
NSLog(@"Published server");
}
- (void)netServiceDidStop:(NSNetService *)sender
{
NSLog(@"Server stopped");
}
- (void)netService:(NSNetService *)sender didUpdateTXTRecordData:(NSData *)data
{
NSLog(@"Updated TXT Record");
}
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode
{
NSLog(@"Event on server");
switch(eventCode) {
...
}
}
@end
这通过以下方式调用:
self.controller = [[PalServiceController alloc] init];
[self.controller start];
当我使用Bonjour Browser时 ,可以看到该服务,并且当我使用自己的NSNetServiceBrowser
实现或Bill NSNetServiceBrowser
的示例( 博客文章 , 代码 )时,它似乎已建立连接(即,我自己的实现收到NSStreamEventHasSpaceAvailable
和NSStreamEventOpenCompleted
通过stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode
。 但是,以上方法均未在服务器上调用。
我还是iOS的新手,所以我希望这只是一些愚蠢的错误,可以很容易地解决。
-[NSNetService publish]
仅发布服务; 您负责创建套接字并侦听提供给NSNetService初始化程序的端口。 您不会收到netService:didAcceptConnectionWithInputStream:outputStream:
因为NSNetService对套接字一无所知。
如果您希望NSNetService为您管理套接字并发送didAcceptConnection...
使用-[NSNetService publishWithOptions:]
:
[self.ns publishWithOptions:NSNetServiceListenForConnections];
在这种情况下,您需要确保用于初始化NSNetService的端口未使用。 您的getPort
方法永远不会关闭套接字(并且会泄漏CFSocketRef),因此在发布服务时将使用该套接字,从而导致错误。
我建议您删除getPort
并按照Apple在NSNetServices.h中的建议,“将端口号指定为零以使用随机端口。”
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