TCP:
服务器：
#import <Foundation/Foundation.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> int main(int argc, const char * argv[]) { @autoreleasepool { // 1 int err; int fd=socket(AF_INET, SOCK_STREAM , 0); BOOL success=(fd!=-1); // 1 // 2 if (success) { NSLog(@"socket success"); struct sockaddr_in addr; memset(&addr, 0, sizeof(addr)); addr.sin_len=sizeof(addr); addr.sin_family=AF_INET; // ======================================================================= addr.sin_port=htons(1024); // ============================================================================ addr.sin_addr.s_addr=INADDR_ANY; err=bind(fd, (const struct sockaddr *)&addr, sizeof(addr)); success=(err==0); } // 2 // ============================================================================ if (success) { NSLog(@"bind(绑定) success"); err=listen(fd, 5);//开始监听 success=(err==0); } // ============================================================================ //3 if (success) { NSLog(@"listen success"); while (true) { struct sockaddr_in peeraddr; int peerfd; socklen_t addrLen; addrLen=sizeof(peeraddr); NSLog(@"prepare accept"); peerfd=accept(fd, (struct sockaddr *)&peeraddr, &addrLen); success=(peerfd!=-1); // ============================================================================ if (success) { NSLog(@"accept success,remote address:%s,port:%d",inet_ntoa(peeraddr.sin_addr),ntohs(peeraddr.sin_port)); char buf[1024]; ssize_t count; size_t len=sizeof(buf); do { count=recv(peerfd, buf, len, 0); NSString* str = [NSString stringWithCString:buf encoding:NSUTF8StringEncoding]; NSLog(@"%@",str); } while (strcmp(buf, "exit")!=0); } // ============================================================================ close(peerfd); } } //3 } return 0; }
客户端：
// // main.m // kewai_SocketClient // #import <Foundation/Foundation.h> #include <sys/socket.h> #include <netinet/in.h> #import <arpa/inet.h> int main(int argc, const char * argv[]) { @autoreleasepool { // 1 int err; int fd=socket(AF_INET, SOCK_STREAM, 0); BOOL success=(fd!=-1); struct sockaddr_in addr; // 1 // 2 if (success) { NSLog(@"socket success"); memset(&addr, 0, sizeof(addr)); addr.sin_len=sizeof(addr); addr.sin_family=AF_INET; addr.sin_addr.s_addr=INADDR_ANY; err=bind(fd, (const struct sockaddr *)&addr, sizeof(addr)); success=(err==0); } // 2 //3 if (success) { //============================================================================ struct sockaddr_in peeraddr; memset(&peeraddr, 0, sizeof(peeraddr)); peeraddr.sin_len=sizeof(peeraddr); peeraddr.sin_family=AF_INET; peeraddr.sin_port=htons(1024); // peeraddr.sin_addr.s_addr=INADDR_ANY; peeraddr.sin_addr.s_addr=inet_addr("172.16.10.120"); // 这个地址是服务器的地址， socklen_t addrLen; addrLen =sizeof(peeraddr); NSLog(@"connecting"); err=connect(fd, (struct sockaddr *)&peeraddr, addrLen); success=(err==0); if (success) { // struct sockaddr_in addr; err =getsockname(fd, (struct sockaddr *)&addr, &addrLen); success=(err==0); //============================================================================ //============================================================================ if (success) { NSLog(@"connect success,local address:%s,port:%d",inet_ntoa(addr.sin_addr),ntohs(addr.sin_port)); char buf[1024]; do { printf("input message:"); scanf("%s",buf); send(fd, buf, 1024, 0); } while (strcmp(buf, "exit")!=0); } } else{ NSLog(@"connect failed"); } } // ============================================================================ //3 } return 0; }
UDP：
服务器：
/* *UDP/IP应用编程接口（API） *服务器的工作流程：首先调用socket函数创建一个Socket，然后调用bind函数将其与本机 *地址以及一个本地端口号绑定，接收到一个客户端时，服务器显示该客户端的IP地址，并将字串 *返回给客户端。 */ #include<stdio.h> #include<stdlib.h> #include<string.h> #include<errno.h> #include<sys/types.h> #include<sys/socket.h> #include<netinet/in.h> #import <arpa/inet.h> int main(int argc,char **argv) { int ser_sockfd; int len; //int addrlen; socklen_t addrlen; char seraddr[100]; struct sockaddr_in ser_addr; /*建立socket*/ ser_sockfd=socket(AF_INET,SOCK_DGRAM,0); if(ser_sockfd<0) { printf("I cannot socket success "); return 1; } /*填写sockaddr_in 结构*/ addrlen=sizeof(struct sockaddr_in); bzero(&ser_addr,addrlen); ser_addr.sin_family=AF_INET; ser_addr.sin_addr.s_addr=htonl(INADDR_ANY); ser_addr.sin_port=htons(1024); /*绑定客户端*/ if(bind(ser_sockfd,(struct sockaddr *)&ser_addr,addrlen)<0) { printf("connect"); return 1; } while(1) { bzero(seraddr,sizeof(seraddr)); len=recvfrom(ser_sockfd,seraddr,sizeof(seraddr),0,(struct sockaddr*)&ser_addr,&addrlen); /*显示client端的网络地址*/ printf("receive from %s ",inet_ntoa(ser_addr.sin_addr)); /*显示客户端发来的字串*/ printf("recevce:%s",seraddr); /*将字串返回给client端*/ sendto(ser_sockfd,seraddr,len,0,(struct sockaddr*)&ser_addr,addrlen); } }
客户端：
/* *UDP/IP应用编程接口（API） *客户端的工作流程：首先调用socket函数创建一个Socket，填写服务器地址及端口号， *从标准输入设备中取得字符串，将字符串传送给服务器端，并接收服务器端返回的字 *符串。最后关闭该socket。 */ #include<stdio.h> #include<stdlib.h> #include<string.h> #include<errno.h> #include<sys/types.h> #include<sys/socket.h> #include<netinet/in.h> #include <netinet/in.h> #import <arpa/inet.h> int GetServerAddr(char * addrname) { printf("please input server addr:"); scanf("%s",addrname); return 1; } int main(int argc,char **argv) { int cli_sockfd; int len; socklen_t addrlen; char seraddr[14]; struct sockaddr_in cli_addr; char buffer[256]; GetServerAddr(seraddr); /* 建立socket*/ cli_sockfd=socket(AF_INET,SOCK_DGRAM,0); if(cli_sockfd<0) { printf("I cannot socket success "); return 1; } /* 填写sockaddr_in*/ addrlen=sizeof(struct sockaddr_in); bzero(&cli_addr,addrlen); cli_addr.sin_family=AF_INET; cli_addr.sin_addr.s_addr=inet_addr(seraddr); //cli_addr.sin_addr.s_addr=htonl(INADDR_ANY); cli_addr.sin_port=htons(1024); bzero(buffer,sizeof(buffer)); /* 从标准输入设备取得字符串*/ len=read(STDIN_FILENO,buffer,sizeof(buffer)); /* 将字符串传送给server端*/ sendto(cli_sockfd,buffer,len,0,(struct sockaddr*)&cli_addr,addrlen); /* 接收server端返回的字符串*/ len=recvfrom(cli_sockfd,buffer,sizeof(buffer),0,(struct sockaddr*)&cli_addr,&addrlen); //printf("receive from %s ",inet_ntoa(cli_addr.sin_addr)); printf("receive: %s",buffer); close(cli_sockfd); }