ios开发实现socket连接局域网打印机打印

// // AsyncSocket.h // // This class is in the public domain. // Originally created by Dustin Voss on Wed Jan 29 2003. // Updated and maintained by Deusty Designs and the Mac development community. // // http://code.google.com/p/cocoaasyncsocket/ // #import <Foundation/Foundation.h> @class AsyncSocket; @class AsyncReadPacket; @class AsyncWritePacket; extern NSString *const AsyncSocketException; extern NSString *const AsyncSocketErrorDomain; enum AsyncSocketError { AsyncSocketCFSocketError = kCFSocketError, // From CFSocketError enum. AsyncSocketNoError = 0, // Never used. AsyncSocketCanceledError, // onSocketWillConnect: returned NO. AsyncSocketConnectTimeoutError, AsyncSocketReadMaxedOutError, // Reached set maxLength without completing AsyncSocketReadTimeoutError, AsyncSocketWriteTimeoutError }; typedef enum AsyncSocketError AsyncSocketError; @protocol AsyncSocketDelegate @optional /** * 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:(NSUInteger)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:(NSUInteger)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:(NSUInteger)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:(NSUInteger)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; @end //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// #pragma mark - //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// @interface AsyncSocket : NSObject { CFSocketNativeHandle theNativeSocket4; CFSocketNativeHandle theNativeSocket6; CFSocketRef theSocket4; // IPv4 accept or connect socket CFSocketRef theSocket6; // IPv6 accept or connect socket CFReadStreamRef theReadStream; CFWriteStreamRef theWriteStream; CFRunLoopSourceRef theSource4; // For theSocket4 CFRunLoopSourceRef theSource6; // For theSocket6 CFRunLoopRef theRunLoop; CFSocketContext theContext; NSArray *theRunLoopModes; NSTimer *theConnectTimer; NSMutableArray *theReadQueue; AsyncReadPacket *theCurrentRead; NSTimer *theReadTimer; NSMutableData *partialReadBuffer; NSMutableArray *theWriteQueue; AsyncWritePacket *theCurrentWrite; NSTimer *theWriteTimer; id theDelegate; UInt16 theFlags; long theUserData; }