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Socket开发——导入头文件
Socket 开发的相关文档可以查阅百度百科
http://baike.baidu.com
#import<sys/socket.h>
#import<netinet/in.h>
#import<arpa/inet.h>
Socket开发——socket
/**
参数
domain: 协议域，AF_INET
type: Socket 类型，SOCK_STREAM/SOCK_DGRAM
protocol: IPPROTO_TCP
返回值
socket
*/
int clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
Socket开发——connect
/**
参数
1> 客户端socket
2> 指向数据结构sockaddr的指针，其中包括目的端口和IP地址
3> 结构体数据长度
返回值
0 成功/其他 错误代号
*/
struct sockaddr_in serverAddr;
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(12345);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
int connectResult = connect(clientSocket, (const struct sockaddr *)&serverAddr, sizeof(serverAddr));
Socket开发——Netcat
$ nc -lk 12345
始终监听本地计算机12345端口的数据
Netcat
是终端下用于调试和检查网络的工具包
可用于创建 TCP/IP 连接
Socket开发——send
/**
参数
1> 客户端socket
2> 发送内容地址
3> 发送内容长度
4> 发送方式标志，一般为0
返回值
如果成功，则返回发送的字节数，失败则返回SOCKET_ERROR
*/
const char *sendMessage = "hello";
ssize_t sendLen = send(clientSocket, sendMessage, strlen(sendMessage), 0);
Socket开发——recv
/**
参数
1> 客户端socket
2> 接收内容缓冲区地址
3> 接收内容缓存区长度
4> 接收方式，0表示阻塞，必须等待服务器返回数据
返回值
如果成功，则返回读入的字节数，失败则返回SOCKET_ERROR
*/
uint8_t buffer[1024];
ssize_t recvLen = recv(clientSocket, &buffer, sizeof(buffer), 0);
NSData *data = [NSData dataWithBytes:buffer length:recvLen];
NSString *recvMessage = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
Socket开发——close
// 关闭socket
close(clientSocket);
Socket通讯UITests
#import
@interface _02__Socket__UITests : XCTestCase
@end
@implementation _02__Socket__UITests
- (void)setUp {
[super setUp];
// Put setup code here. This method is called before the invocation of each test method in the class.
// In UI tests it is usually best to stop immediately when a failure occurs.
self.continueAfterFailure = NO;
// UI tests must launch the application that they test. Doing this in setup will make sure it happens for each test method.
[[[XCUIApplication alloc] init] launch];
// In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
}
- (void)tearDown {
// Put teardown code here. This method is called after the invocation of each test method in the class.
[super tearDown];
}
- (void)testExample {
// Use recording to get started writing UI tests.
// Use XCTAssert and related functions to verify your tests produce the correct results.
}
@end
Socket通讯ViewController.m
#import "ViewController.h"
#import
#import
#import
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self socketDemo];
}
#pragma mark --
-(void)socketDemo
{
//1.创建一个socket
/*
domain: 协议域 IPV4 ,IPV6
type: socket 类型 SOCKET_STREAM / SOCK_DGRAM
protocol: TCP ? UDP ? 0 ,自动根据第二个参数来决定合适的协议
*/
int clientSocket = socket(AF_INET, SOCK_STREAM, 0);
//2.连接服务器
struct sockaddr_in severAddr;
severAddr.sin_family = AF_INET;
//端口
severAddr.sin_port = htons(12345);
//地址
severAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
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