IOS開(kāi)發(fā)基礎(chǔ)之socket的使用

socket是純C語(yǔ)言的，跨平臺(tái)的

第一章：

• socket 的演示

// ViewController.m // 29-socket演示 // Created by 魯軍 on 2021/3/9. #import "ViewController.h" #import <sys/socket.h> #import <netinet/in.h> #import <arpa/inet.h> @interface ViewController () @end @implementation ViewController /*lujun@lujundeMac ~ % nc -lk 12345終端模擬一個(gè)虛擬你服務(wù)器**/ - (void)viewDidLoad {[super viewDidLoad];//1 創(chuàng)建Socket//第一個(gè)參數(shù)domain 協(xié)議簇 指定IPV4//第二個(gè)參數(shù) type socket的類型 流式socket 數(shù)據(jù)報(bào) socket//第三個(gè)參數(shù)protocol 協(xié)議//返回值 如果創(chuàng)建成功返回的是socket的描述符 失敗 -1int clientSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);//2連接服務(wù)器//第一個(gè)參數(shù) socket 的描述符//第二個(gè)參數(shù) 結(jié)構(gòu)體 ip地址和端口//第三個(gè)參數(shù) 結(jié)構(gòu)體的長(zhǎng)度 sizeof//返回值 成功0 失敗 非 0struct sockaddr_in addr;addr.sin_family = AF_INET;addr.sin_addr.s_addr = inet_addr("127.0.0.1");addr.sin_port=htons(12345);int result = connect(clientSocket,(const struct sockaddr *) &addr, sizeof(addr));////if(result==0){// NSLog(@"成功");//}else{//NSLog(@"失敗");//}if(result !=0){NSLog(@"失敗");return;}//3想服務(wù)器發(fā)送數(shù)據(jù)//成功則返回實(shí)際傳送出去的字符數(shù) 失敗返回 -1const char *msg = "Hello World";//strlen(msg) 字符數(shù) 不是字節(jié)數(shù)ssize_t sendCount = send(clientSocket,msg, strlen(msg),0);NSLog(@"發(fā)送的字節(jié)數(shù) %zd",sendCount);//4 接收服務(wù)器的返回的數(shù)據(jù)//返回的是實(shí)際接收的字節(jié)個(gè)數(shù)uint8_t buffer[1024];ssize_t recvCount = recv(clientSocket,buffer, sizeof(buffer),0);NSLog(@"接收的字節(jié)數(shù) %zd",recvCount);NSData *data = [NSData dataWithBytes:buffer length:recvCount];NSString *recvMsg = [[NSString alloc] initWithData:data encoding: NSUTF8StringEncoding];NSLog(@"收到的的信息 %@",recvMsg);// 5 關(guān)閉連接close(clientSocket); } @end

第二章

• 30-聊天室Socket
  

// ViewController.m // 30-聊天室Socket // Created by 魯軍 on 2021/3/8. #import "ViewController.h" #import <sys/socket.h> #import <netinet/in.h> #import <arpa/inet.h> @interface ViewController () @property (weak, nonatomic) IBOutlet UITextField *portView; @property (weak, nonatomic) IBOutlet UITextField *ipView; @property (weak, nonatomic) IBOutlet UITextField *sendMsgView; @property (weak, nonatomic) IBOutlet UILabel *recvMsgView; @property(nonatomic,assign) int clientSocket; @end @implementation ViewController /*$ lujun@lujundeMac IOSThreadNetwork % nc -lk 12345**/ //連接服務(wù)器 - (IBAction)connectClick:(id)sender {[self connect:self.ipView.text port:[self.portView.text intValue]]; }//點(diǎn)擊發(fā)送按鈕 - (IBAction)sendClick:(id)sender {self.recvMsgView.text = [self sendAndRecv:self.sendMsgView.text]; } - (IBAction)closeClick:(id)sender {close(self.clientSocket);NSLog(@"關(guān)閉連接"); } - (void)viewDidLoad {[super viewDidLoad]; } -(NSString *)sendAndRecv:(NSString *)sendMsg{//3想服務(wù)器發(fā)送數(shù)據(jù)//成功則返回實(shí)際傳送出去的字符數(shù) 失敗返回 -1const char *msg = sendMsg.UTF8String; //OC轉(zhuǎn)C 語(yǔ)言的字符串//strlen(msg) 字符數(shù) 不是字節(jié)數(shù)ssize_t sendCount = send(self.clientSocket,msg, strlen(msg),0);NSLog(@"發(fā)送的字節(jié)數(shù) %zd",sendCount);//4 接收服務(wù)器的返回的數(shù)據(jù)//返回的是實(shí)際接收的字節(jié)個(gè)數(shù)uint8_t buffer[1024];ssize_t recvCount = recv(self.clientSocket,buffer, sizeof(buffer),0);NSLog(@"接收的字節(jié)數(shù) %zd",recvCount);NSData *data = [NSData dataWithBytes:buffer length:recvCount];NSString *recvMsg = [[NSString alloc] initWithData:data encoding: NSUTF8StringEncoding];NSLog(@"收到的的信息 %@",recvMsg);return recvMsg; } -(BOOL)connect:(NSString *)ip port:(int)port{int clientSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);self.clientSocket = clientSocket;struct sockaddr_in addr;addr.sin_family = AF_INET;addr.sin_addr.s_addr = inet_addr(ip.UTF8String); //oc字符串轉(zhuǎn)c語(yǔ)言的字符串addr.sin_port=htons(port);int result = connect(self.clientSocket,(const struct sockaddr *) &addr, sizeof(addr));if(result ==0){return YES;}else{return NO;}} @end

info.plist加入ATS

<key>NSAppTransportSecurity</key><dict><key>NSAllowsArbitraryLoads</key><true/></dict>

第三章

• 使用Socket請(qǐng)求百度
  

// // ViewController.m // 31-使用Socket請(qǐng)求百度 // // Created by 魯軍 on 2021/3/8. //#import "ViewController.h" #import <sys/socket.h> #import <netinet/in.h> #import <arpa/inet.h> @interface ViewController () @property (weak, nonatomic) IBOutlet UIWebView *webView; @property(nonatomic,assign) int clientSocket; @end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];//1.連接百度的服務(wù)器//36.152.44.96//直接ping www.baidu.com 可以看到 百度的IP地址BOOL result = [self connect:@"36.152.44.96" port:80];if(!result){NSLog(@"連接失敗");return;}NSLog(@"連接成功");//構(gòu)造http請(qǐng)求頭/* NSString *request = @"GET / HTTP/1.1\r\n""Host: www.baidu.com\r\n""User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1\r\n""Connection: close\r\n\r\n";*/NSString *request = @"GET / HTTP/1.1\r\n""Host: www.baidu.com\r\n""Connection: close\r\n\r\n";//http/1.0 短連接 當(dāng)響應(yīng)結(jié)束后連接會(huì)立即斷開(kāi)//http/1.1 長(zhǎng)連接 當(dāng)響應(yīng)結(jié)束后 連接會(huì)等待非常短的時(shí)間 如果這個(gè)時(shí)間內(nèi)沒(méi)有新的請(qǐng)求 就斷開(kāi)連接//服務(wù)器響應(yīng)頭NSString *response = [self sendAndRecv:request];//關(guān)閉連接close(self.clientSocket);NSLog(@"%@",response);//截取響應(yīng)頭 響應(yīng)頭的結(jié)束標(biāo)志 \r\n\r\nNSRange range = [response rangeOfString:@"\r\n\r\n"];NSString *html = [response substringFromIndex:range.length + range.location];[self.webView loadHTMLString:html baseURL:nil];[self.webView loadHTMLString:html baseURL:[NSURL URLWithString:@"http://www.baidu.com"]]; }-(NSString *)sendAndRecv:(NSString *)sendMsg{//3想服務(wù)器發(fā)送數(shù)據(jù)//成功則返回實(shí)際傳送出去的字符數(shù) 失敗返回 -1const char *msg = sendMsg.UTF8String; //OC轉(zhuǎn)C 語(yǔ)言的字符串//strlen(msg) 字符數(shù) 不是字節(jié)數(shù)ssize_t sendCount = send(self.clientSocket,msg, strlen(msg),0);NSLog(@"發(fā)送的字節(jié)數(shù) %zd",sendCount);//4 接收服務(wù)器的返回的數(shù)據(jù)//返回的是實(shí)際接收的字節(jié)個(gè)數(shù)uint8_t buffer[1024];NSMutableData *mData = [NSMutableData data];ssize_t recvCount = recv(self.clientSocket,buffer, sizeof(buffer),0);[mData appendBytes:buffer length:recvCount];//服務(wù)器會(huì)返回多次數(shù)據(jù) 等所有數(shù)據(jù)都接收完成 再轉(zhuǎn)換成字符串while(recvCount !=0){recvCount = recv(self.clientSocket,buffer, sizeof(buffer),0);NSLog(@"接收的字節(jié)數(shù) %zd",recvCount);[mData appendBytes:buffer length:recvCount];}//把字節(jié)數(shù)組轉(zhuǎn)換成oc字符串NSString *recvMsg = [[NSString alloc] initWithData:mData.copy encoding:NSUTF8StringEncoding];return recvMsg; } -(BOOL)connect:(NSString *)ip port:(int)port{int clientSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);self.clientSocket = clientSocket;struct sockaddr_in addr;addr.sin_family = AF_INET;addr.sin_addr.s_addr = inet_addr(ip.UTF8String); //oc字符串轉(zhuǎn)c語(yǔ)言的字符串addr.sin_port=htons(port);int result = connect(self.clientSocket,(const struct sockaddr *) &addr, sizeof(addr));if(result ==0){return YES;}else{return NO;} } @end

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