iOS 基于Socket 的 C/S 网络通信结构（下一个）

#import <UIKit/UIKit.h>

#import <CoreFoundation/CoreFoundation.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define PORT 8734       //将端口设置为8734。能够依据详细情况改变

@interface ViewController : UIViewController<NSStreamDelegate>
{
int flag ; //操作标志 0为发送 1为接收
}

@property (nonatomic, retain) NSInputStream *inputStream;
@property (nonatomic, retain) NSOutputStream *outputStream;

@property (weak, nonatomic) IBOutlet UILabel *message;    //在client显示来自服务端的消息

- (IBAction)sendData:(id)sender;      //发送client的消息
- (IBAction)receiveData:(id)sender;   //接收来自服务端的消息

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];

}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}

//初始化client网络连接
- (void)initNetworkCommunication
{

CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
//这里须要填写 IP 地址，依据自己路由能够用的 IP来定，这里是192.168.1.103，假设不知道能够下载 IP 扫描器
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"192.168.1.103", PORT, &readStream, &writeStream);

self.inputStream = (__bridge_transfer NSInputStream *)readStream;  //将CFStream对象转化为NSStream对象
self.outputStream = (__bridge_transfer NSOutputStream
*)writeStream;              //将CFStream对象转化为NSStream对象
[self.inputStream setDelegate:self];
[self.outputStream setDelegate:self];
[self.inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];    //NSStream 方法 scheduleInRunLoop: 设置 Run Loop
[self.outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[self.inputStream open];   //NSStream 的 open 方法来打开数据流对象
[self.outputStream open];

}

//关闭数据流操作
-(void)close
{
[self.outputStream close];
[self.outputStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[self.outputStream setDelegate:nil];
[self.inputStream close];
[self.inputStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[self.inputStream setDelegate:nil];
}

//从client发送数据事件方法
- (IBAction)sendData:(id)sender {
flag = 0;   //表示发送
[self initNetworkCommunication];

}

//从服务端接收数据事件方法
- (IBAction)receiveData:(id)sender {
flag = 1;   //表示接收
[self initNetworkCommunication];

}

-(void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {
NSString *event;
switch (streamEvent) {
case NSStreamEventNone:  //没有事件发生
event = @"NSStreamEventNone";
break;
case NSStreamEventOpenCompleted:  //成功打开流
event = @"NSStreamEventOpenCompleted";
break;
case NSStreamEventHasBytesAvailable:   //这个流有数据能够读，在读取数据时使用
event = @"NSStreamEventHasBytesAvailable";
if (flag ==1 && theStream == _inputStream) {
NSMutableData *input = [[NSMutableData alloc] init];
uint8_t buffer[2048]; //读取数据准备缓冲区，本例中设置的是2048字节，这个大小会对流的读取有非常大影响
int len;
while([self.inputStream hasBytesAvailable])
{
len = [self.inputStream read:buffer maxLength:sizeof(buffer)];  //读取数据到缓冲区
if (len > 0)
{
[input appendBytes:buffer length:len];
}
}
NSString *resultstring = [[NSString alloc] initWithData:input encoding:NSUTF8StringEncoding];
NSLog(@"接收:%@",resultstring);
self.message.text = resultstring;
}
break;
case NSStreamEventHasSpaceAvailable:   //这个流能够接收数据的写入，在写数据时使用
event = @"NSStreamEventHasSpaceAvailable";
if (flag ==0 && theStream == _outputStream) {
//输出
UInt8 buff[] = "收到啦，服务端。";       //向服务端发送的消息
[self.outputStream write:buff maxLength: strlen((const char*)buff)+1];   //向服务端写入数据方法
//必须关闭输出流否则，server端一直读取不会停止。
[self.outputStream close];
}
break;
case NSStreamEventErrorOccurred:      //数据流错误发生
event = @"NSStreamEventErrorOccurred";
[self close];
break;
case NSStreamEventEndEncountered:     //数据流结束
event = @"NSStreamEventEndEncountered";
NSLog(@"Error:%d:%@",[[theStream streamError] code], [[theStream streamError] localizedDescription]);
break;
default:
[self close];
event = @"Unknown";
break;
}

}

@end

如有哪些不正确的地方，欢迎指出！