开源网络库 GCDAsyncSocket 笔记

开源网络库GCDAsyncSocket 笔记

GCDAsyncSocket地址: https://github.com/robbiehanson/CocoaAsyncSocket/

 

使用方法:

创建:

asyncsocket = [[GCDAsyncSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_main_queue()];

这里我们让所有的回调执行都发生在主线程的queue里，当然我们可以传一个专用的queue.

连接 :

NSError *err= nil;

if (![asyncsocketconnectToHost:@"deusty.com" onPort:80error:&err]) // Asynchronous!

{

    //该方法异步，返回错误是因为delegate没设置等

    NSLog(@"Igoofed: %@",err);

}

　该方法会立刻返回,当成功连接上，delegate的 socket:didConnectToHost:port: 方法会被调用.

- (void)socket:(GCDAsyncSocket*)sender didConnectToHost:(NSString *)hostport:(UInt16)port

{

    NSLog(@"Cool,I'm connected! That was easy.");

}

有几种不同的连接方法,比如带超时的.。。。

虽然这个时候可能 socket 还没连接上，但是我们依然可以投递 读/写请求:

[asyncSocket readDataToLength:LENGTH_HEADER withTimeout:-1tag:TAG_HEADER];

这样读请求会自动进入了队列,当socket连接上后,请求会自动出队被执行。(这里假设先读一个包头,再根据长度接收包体，这个读操作完成后 socket:didReadData:withTag: 会被调用)

当然我们可以投递多个读写操作而不必等待上一个完成.

[asyncSocket writeData:msgHeader withTimeout:-1tag:TAG_HEADER];

[asyncSocket writeData:msgBody withTimeout:-1tag:TAG_BODY];

上面的操作均为异步。下面为操作完成的委托方法:

read:

- (void)socket:(GCDAsyncSocket *)sender didReadData:(NSData *)data withTag:(long)tag{    if (tag == TAG_HEADER)    {        int bodyLength = [self parseHeader:data];        [socket readDataToLength:bodyLength withTimeout:-1 tag:TAG_RESPONSE_BODY];    }    else if (tag == TAG_RESPONSE_BODY)    {        // Process the response        [self handleResponseBody:data];        // Start reading the next response        [socket readDataToLength:headerLength withTimeout:-1 tag:TAG_FIXED_LENGTH_HEADER];    }}
//还有另一个读方法,
// [asyncSocket readDataToData:msgSeparator withTimeout:TIMEOUT_NONE tag:TAG_CAPABILITIES];
// 读当遇到一个指定的分隔符后操作返回。比如用作 http, 因为http 每个消息都会有一个@"\r\n\r\n" 结尾标志.

//如果想跟踪进度 socket: didReadPartialDataOfLength: tag: 用这个

write:

- (void)socket:(GCDAsyncSocket*)sock didWriteDataWithTag:(long)tag

{

    if (tag==TAG_HEADER)
　　　　NSLog(@"TAG_HEADERrequest sent");

else if (tag==TAG_BODY)
　　　　NSLog(@"TAG_BODYrequest sent");

}

断开释放一个连接实例

[asyncSocket setDelegate:nil delegateQueue:NULL];

[asyncSocket disconnect];

[asyncSocket release];

　　

相关的delegate 方法(回调)

socket: didConnectToHost: port:


socket: didReadData: withTag:

socket: didReadPartialDataOfLength: tag:

socket: shouldTimeoutReadWithTag: elapsed:bytesDone:


socket: didWriteDataWithTag:

socket: didWritePartialDataOfLength: tag:

socket: shouldTimeoutWriteWithTag: elapsed:bytesDone:


socketDidSecure:


socket: didAcceptNewSocket:


newSocketQueueForConnectionFromAddress:onSocket:


socketDidCloseReadStream:


socketDidDisconnect: withError:

本文转自：http://www.cnblogs.com/sanjin/archive/2012/07/19/2599635.html（版权归原作者所有）