标签:action 线程 open elf 输入输出流 输出 服务器 回调 ast
一、基本概念
在iOS中以NSStream(流)来发送和接收数据,可以设置流的代理,对流状态的变化做出相应。
1连接建立
2接收到数据
3连接关闭
NSStream:数据流的父类,用于定义抽象特性,例如:打开、关闭代理,NSStream继承自CFStream(CoreFoundation)
NSInputStream:NSStream的子类,用于读取输入
NSOutputStream:NSSTream的子类,用于写输出
二、开发步骤
1、网络连接设置
设置网络连接,绑定到主机和端口
设置输入流和输出流的代理,监听数据流的状态
将输入输出流添加至运行循环
打开输入流和输出流
2、发送消息给服务器
3、有可读取字节时,读取服务器返回的内容
4、到达流末尾时,关闭流,同时并从主运行循环中删除
#import "ViewController.h"
@interface ViewController ()<NSStreamDelegate>{
NSInputStream *_inputStream;
NSOutputStream *_outputSteam;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)connectToServer:(id)sender {
//ios里实现sokcet的连接,使用C语言
// 1.与服务器通过三次握手建立连接
NSString *host = @"127.0.0.1";
int port = 12345;
// 2.定义输入输出流
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
// 3.分配输入输出流的内存空间
CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)host, port, &readStream, &writeStream);
// 4.把C语言的输入输出流转成OC对象
_inputStream = (__bridge NSInputStream *)readStream;
_outputSteam = (__bridge NSOutputStream *)(writeStream);
// 5.设置代理,监听数据接收的状态
_outputSteam.delegate = self;
_inputStream.delegate = self;
// 把输入输入流添加到主运行循环(RunLoop)
// 主运行循环是监听网络状态
[_outputSteam scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
[_inputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
// 6.打开输入输出流
[_inputStream open];
[_outputSteam open];
}
//代理的回调是在主线程
//NSLog(@"%@",[NSThread currentThread]);
-(void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode{
// NSStreamEventOpenCompleted = 1UL << 0,
// NSStreamEventHasBytesAvailable = 1UL << 1,
// NSStreamEventHasSpaceAvailable = 1UL << 2,
// NSStreamEventErrorOccurred = 1UL << 3,
// NSStreamEventEndEncountered = 1UL << 4
switch (eventCode) {
case NSStreamEventOpenCompleted:
NSLog(@"%@",aStream);
NSLog(@"成功连接建立,形成输入输出流的传输通道");
break;
case NSStreamEventHasBytesAvailable:
NSLog(@"有数据可读");
[self readData];
break;
case NSStreamEventHasSpaceAvailable:
NSLog(@"可以发送数据");
break;
case NSStreamEventErrorOccurred:
NSLog(@"有错误发生,连接失败");
break;
case NSStreamEventEndEncountered:
NSLog(@"正常的断开连接");
//把输入输入流关闭,而还要从主运行循环移除
[_inputStream close];
[_outputSteam close];
[_inputStream removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
[_outputSteam removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
break;
default:
break;
}
}
- (IBAction)loginBtnClick:(id)sender {
//发送登录请求 使用输出流
//拼接登录的指令 iam:zhangsan
NSString *loginStr = @"iam:zhangsan";
//uint8_t * 字符数组
NSData *data = [loginStr dataUsingEncoding:NSUTF8StringEncoding];
[_outputSteam write:data.bytes maxLength:data.length];
}
#pragma mark 读取服务器返回的数据
-(void)readData{
//定义缓冲区 这个缓冲区只能存储1024字节
uint8_t buf[1024];
// 读取数据
// len为从服务器读取到的实际字节数
NSInteger len = [_inputStream read:buf maxLength:sizeof(buf)];
// 把缓冲区里的实现字节数转成字符串
NSString *receiverStr = [[NSString alloc] initWithBytes:buf length:len encoding:NSUTF8StringEncoding];
NSLog(@"%@",receiverStr);
}
@end
标签:action 线程 open elf 输入输出流 输出 服务器 回调 ast
原文地址:http://www.cnblogs.com/jx66/p/7233985.html