实现socket的监听方法

• 使用c语言
• 使用CocoaAsyncSocket框架(内部对C的封装)
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1.创建命令行工程

命令行工程.png

2.集成CocoaAsyncSocket

如果您已经熟练使用CocoaPods，请忽略此点
1.导入框架文件

TCP:UDP.png

如果编译出现

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_GCDAsyncSocket", referenced from:
      objc-class-ref in LKLScoketService.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

解决办法

添加文件.png

自定义socket服务对象

.h文件

#import <Foundation/Foundation.h>
#import "GCDAsyncSocket.h"
@interface LKLSocketService : NSObject
//开启服务
- (void)start;
@end

.m文件

#import "LKLSocketService"
@interface LKLSocketService ()<GCDAsyncSocketDelegate>
@property (strong, nonatomic) GCDAsyncSocket *socket;
@property (strong, nonatomic) NSMutableArray *clientSockets;//保存客户端scoket
@end
@implementation LKLSocketService
- (NSMutableArray *)clientSockets
{
    if (_clientSockets == nil) {
        _clientSockets = [[NSMutableArray alloc]init];
    }
    return _clientSockets;
}

- (void)start
{
    //1.创建scoket对象
    GCDAsyncSocket *serviceScoket = [[GCDAsyncSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_global_queue(0, 0)];

    //2.绑定端口(5288)
   //端口任意，但遵循有效端口原则范围：0~65535，其中0~1024由系统使用或者保留端口，开发中建议使用1024以上的端口
    NSError *error = nil;
    [serviceScoket acceptOnPort:5288 error:&error];

    //3.开启服务(实质第二步绑定端口的同时默认开启服务)
    if (error == nil)
    {
        NSLog(@"开启成功");
    }
    else
    {
        NSLog(@"开启失败");
    }
    self.socket = serviceScoket;
}

#pragma mark GCDAsyncSocketDelegate
//连接到客户端socket
- (void)socket:(GCDAsyncSocket *)sock didAcceptNewSocket:(GCDAsyncSocket *)newSocket
{
    //sock 服务端的socket
    //newSocket 客户端连接的socket
    NSLog(@"%@----%@",sock, newSocket);

    //1.保存连接的客户端socket(否则newSocket释放掉后链接会自动断开)
    [self.clientSockets addObject:newSocket];

    //连接成功服务端立即向客户端提供服务
    NSMutableString *serviceContent = [NSMutableString string];
    [serviceContent appendString:@"话费查询请按1\n"];
    [serviceContent appendString:@"话费充值请按2\n"];
    [serviceContent appendString:@"投诉建议请按3\n"];
    [serviceContent appendString:@"最新优惠请按4\n"];
    [serviceContent appendString:@"人工服务请按0\n"];
    [newSocket writeData:[serviceContent dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];

    //2.监听客户端有没有数据上传
    //-1代表不超时
    //tag标示作用
    [newSocket readDataWithTimeout:-1 tag:0];
}

//接收到客户端数据
- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
{
    //1.接受到用户数据
    NSString *str = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    NSInteger code = [str integerValue];
    NSString *responseString = nil;
    switch (code) {
        case 1:
            responseString = @"您的账户余额为0，请尽快充值\n";
            break;
        case 2:
            responseString = @"系统忙，请稍后重试\n";
            break;
        case 3:
            responseString = @"系统忙，暂时不能接受投诉建议\n";
            break;
        case 4:
            responseString = @"请上官网查看更多优惠\n";
            break;
        case 0:
            responseString = @"客服忙，谢谢!\n";
            break;
        default:
            break;
    }
    //处理请求 返回数据
    [sock writeData:[responseString dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];
    if (code == 0) {
        [self.clientSockets removeObject:sock];
    }
    //CocoaAsyncSocket每次读取完成后必须调用一次监听数据方法
    [sock readDataWithTimeout:-1 tag:0];
}

开始Socket服务

main.m文件

#import <Foundation/Foundation.h>
#import "LKLSocketService.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSLog(@"Hello, World!");
        //创建服务对象
        LKLSocketService *socketSerview = [[LKLSocketService alloc]init];
        //开始服务
        [socketSerview start];
        //循环运行
        [[NSRunLoop mainRunLoop]run];//目的让服务器不停止
    }
    return 0;
}

终端模拟客户端

终端.png

使用Telnet命令telnet host port/telnet 192.168.10.10 5288
telnet命令是连接服务器上的某个端口对应的服务

• 通信

  
  
  通信.png
  
  

  Connection closed by foreign host.//断开连接