IOS AsyncSocket

    先分享下

    NSLog(@"model -- %@",[UIDevice currentDevice].model);//判断是iphone或是ipad等

    NSLog(@"version -- %@",[UIDevice currentDevice].systemVersion);//系统版本

  下面的就是把头文件里的东西搬了出来

- (id)init;
- (id)initWithDelegate:(id)delegate;

/**
 * Tells the socket to begin listening and accepting connections on the given port.
 * When a connection comes in, the AsyncSocket instance will call the various delegate methods (see above).
 * The socket will listen on all available interfaces (e.g. wifi, ethernet, etc)
**/
- (BOOL)acceptOnPort:(UInt16)port error:(NSError **)errPtr;

在指定的端口侦听

/**
 * Connects to the given host and port.
 * The host may be a domain name (e.g. "deusty.com") or an IP address string (e.g. "192.168.0.2")
**/
- (BOOL)connectToHost:(NSString *)hostname onPort:(UInt16)port error:(NSError **)errPtr;

向指定的host和端口连接，host格式可以是www.baidu.com 或者 192.168.100.100，它的timeout为－1.

/**
 * This method is the same as connectToHost:onPort:error: with an additional timeout option.
 * To not time out use a negative time interval, or simply use the connectToHost:onPort:error: method.
**/
- (BOOL)connectToHost:(NSString *)hostname
               onPort:(UInt16)port
          withTimeout:(NSTimeInterval)timeout
                error:(NSError **)errPtr;

和connectToHost:onPort:error: 差不多，就是加了个连接时间限制

/**
 * Connects to the given address, specified as a sockaddr structure wrapped in a NSData object.
 * For example, a NSData object returned from NSNetservice's addresses method.
 *
 * If you have an existing struct sockaddr you can convert it to a NSData object like so:
 * struct sockaddr sa  -> NSData *dsa = [NSData dataWithBytes:&remoteAddr length:remoteAddr.sa_len];
 * struct sockaddr *sa -> NSData *dsa = [NSData dataWithBytes:remoteAddr length:remoteAddr->sa_len];
**/
- (BOOL)connectToAddress:(NSData *)remoteAddr error:(NSError **)errPtr;

这个把sockaddr封装到data中，sockaddr中有地址和端口，一直没有用过这个

/**
 * This method is the same as connectToAddress:error: with an additional timeout option.
 * To not time out use a negative time interval, or simply use the connectToAddress:error: method.
**/
- (BOOL)connectToAddress:(NSData *)remoteAddr withTimeout:(NSTimeInterval)timeout error:(NSError **)errPtr;

/**
 * Disconnects immediately. Any pending reads or writes are dropped.
 * If the socket is not already disconnected, the onSocketDidDisconnect delegate method
 * will be called immediately, before this method returns.
 *
 * Please note the recommended way of releasing an AsyncSocket instance (e.g. in a dealloc method)
 * [asyncSocket setDelegate:nil];
 * [asyncSocket disconnect];
 * [asyncSocket release];
**/

- (void)disconnect;

立即断开连接

/**
 * Disconnects after all pending reads have completed.
 * After calling this, the read and write methods will do nothing.
 * The socket will disconnect even if there are still pending writes.
**/

- (void)disconnectAfterReading;

/**
 * Disconnects after all pending writes have completed.
 * After calling this, the read and write methods will do nothing.
 * The socket will disconnect even if there are still pending reads.
**/
- (void)disconnectAfterWriting;

/**
 * Disconnects after all pending reads and writes have completed.
 * After calling this, the read and write methods will do nothing.
**/
- (void)disconnectAfterReadingAndWriting;

/**
 * Returns the local or remote host and port to which this socket is connected, or nil and 0 if not connected.
 * The host will be an IP address.
**/
- (NSString *)connectedHost;
- (UInt16)connectedPort;

- (NSString *)localHost;
- (UInt16)localPort;

/**
 * Returns the local or remote address to which this socket is connected,
 * specified as a sockaddr structure wrapped in a NSData object.
 *
 * See also the connectedHost, connectedPort, localHost and localPort methods.
**/
- (NSData *)connectedAddress;
- (NSData *)localAddress;

／／／／／／／／／／／／／／／／／／／／／  delegate／／／／／／／／／／／／／／／／／／／／

/**
 * In the event of an error, the socket is closed.
 * You may call "unreadData" during this call-back to get the last bit of data off the socket.
 * When connecting, this delegate method may be called
 * before"onSocket:didAcceptNewSocket:" or "onSocket:didConnectToHost:".
**/
- (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err;

/**
 * Called when a socket disconnects with or without error.  If you want to release a socket after it disconnects,
 * do so here. It is not safe to do that during "onSocket:willDisconnectWithError:".
 *
 * If you call the disconnect method, and the socket wasn't already disconnected,
 * this delegate method will be called before the disconnect method returns.
**/
- (void)onSocketDidDisconnect:(AsyncSocket *)sock;

/**
 * Called when a socket accepts a connection.  Another socket is spawned to handle it. The new socket will have
 * the same delegate and will call "onSocket:didConnectToHost:port:".
**/
- (void)onSocket:(AsyncSocket *)sock didAcceptNewSocket:(AsyncSocket *)newSocket;

/**
 * Called when a new socket is spawned to handle a connection.  This method should return the run-loop of the
 * thread on which the new socket and its delegate should operate. If omitted, [NSRunLoop currentRunLoop] is used.
**/
- (NSRunLoop *)onSocket:(AsyncSocket *)sock wantsRunLoopForNewSocket:(AsyncSocket *)newSocket;

/**
 * Called when a socket is about to connect. This method should return YES to continue, or NO to abort.
 * If aborted, will result in AsyncSocketCanceledError.
 *
 * If the connectToHost:onPort:error: method was called, the delegate will be able to access and configure the
 * CFReadStream and CFWriteStream as desired prior to connection.
 *
 * If the connectToAddress:error: method was called, the delegate will be able to access and configure the
 * CFSocket and CFSocketNativeHandle (BSD socket) as desired prior to connection. You will be able to access and
 * configure the CFReadStream and CFWriteStream in the onSocket:didConnectToHost:port: method.
**/
- (BOOL)onSocketWillConnect:(AsyncSocket *)sock;

/**
 * Called when a socket connects and is ready for reading and writing.
 * The host parameter will be an IP address, not a DNS name.
**/
- (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port;

/**
 * Called when a socket has completed reading the requested data into memory.
 * Not called if there is an error.
**/
- (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag;

/**
 * Called when a socket has read in data, but has not yet completed the read.
 * This would occur if using readToData: or readToLength: methods.
 * It may be used to for things such as updating progress bars.
**/
- (void)onSocket:(AsyncSocket *)sock didReadPartialDataOfLength:(CFIndex)partialLength tag:(long)tag;

/**
 * Called when a socket has completed writing the requested data. Not called if there is an error.
**/
- (void)onSocket:(AsyncSocket *)sock didWriteDataWithTag:(long)tag;

/**
 * Called when a socket has written some data, but has not yet completed the entire write.
 * It may be used to for things such as updating progress bars.
**/
- (void)onSocket:(AsyncSocket *)sock didWritePartialDataOfLength:(CFIndex)partialLength tag:(long)tag;

/**
 * Called if a read operation has reached its timeout without completing.
 * This method allows you to optionally extend the timeout.
 * If you return a positive time interval (> 0) the read's timeout will be extended by the given amount.
 * If you don't implement this method, or return a non-positive time interval (<= 0) the read will timeout as usual.
 *
 * The elapsed parameter is the sum of the original timeout, plus any additions previously added via this method.
 * The length parameter is the number of bytes that have been read so far for the read operation.
 *
 * Note that this method may be called multiple times for a single read if you return positive numbers.
**/
- (NSTimeInterval)onSocket:(AsyncSocket *)sock
  shouldTimeoutReadWithTag:(long)tag
                   elapsed:(NSTimeInterval)elapsed
                 bytesDone:(CFIndex)length;

/**
 * Called if a write operation has reached its timeout without completing.
 * This method allows you to optionally extend the timeout.
 * If you return a positive time interval (> 0) the write's timeout will be extended by the given amount.
 * If you don't implement this method, or return a non-positive time interval (<= 0) the write will timeout as usual.
 *
 * The elapsed parameter is the sum of the original timeout, plus any additions previously added via this method.
 * The length parameter is the number of bytes that have been written so far for the write operation.
 *
 * Note that this method may be called multiple times for a single write if you return positive numbers.
**/
- (NSTimeInterval)onSocket:(AsyncSocket *)sock
 shouldTimeoutWriteWithTag:(long)tag
                   elapsed:(NSTimeInterval)elapsed
                 bytesDone:(CFIndex)length;

/**
 * Called after the socket has successfully completed SSL/TLS negotiation.
 * This method is not called unless you use the provided startTLS method.
 *
 * If a SSL/TLS negotiation fails (invalid certificate, etc) then the socket will immediately close,
 * and the onSocket:willDisconnectWithError: delegate method will be called with the specific SSL error code.
**/
- (void)onSocketDidSecure:(AsyncSocket *)sock;

／／／／／／／／／／／／／／／／／／／／ 例子／／／／／／／／／／／／／／／／／

初始化

    socket=[[AsyncSocket alloc]initWithDelegate:self];
    [socket acceptOnPort:3000 error:nil];
    connectedSockets=[[NSMutableArray alloc]initWithCapacity:1];

代理

-(void)onSocket:(AsyncSocket *)sock didAcceptNewSocket:(AsyncSocket *)newSocket
{
    [connectedSockets addObject:newSocket];
    
}
-(void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port
{
   // NSLog(@"peer host -> %@",[sock connectedAddress]);
    NSString *welcomeMsg = @"hello message";
    NSData *welcomeData = [welcomeMsg dataUsingEncoding:NSUTF8StringEncoding];
    [sock writeData:welcomeData withTimeout:-1 tag:1000];
    [sock readDataWithTimeout:1000 tag:2000];
}
-(void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
{
    NSLog(@"read data");
    NSLog(@" string ->> %@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding] );
}

-(void)onSocket:(AsyncSocket *)sock didWriteDataWithTag:(long)tag
{
    NSLog(@"write data");
}