Linux網絡編程socket（三）

客戶端代碼

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>

int main(int argc,char **argv)
{
	int c_fd;
	char readBuf[128];
	int n_read;
	//char * msg="message from client";
	char msg[128]={0};
	
	struct sockaddr_in c_addr;
	
	
	memset(&c_addr,0,sizeof(struct sockaddr_in));
	
	
	
	//1.socket
	c_fd = socket(AF_INET,SOCK_STREAM,0);
	if(c_fd == -1)
	{
		perror("socket");
		exit(-1);
	}
	
	
	
	c_addr.sin_family = AF_INET;
	c_addr.sin_port = htons(atoi(argv[2]));//將端口號轉換成網絡可識別形式（字節序）
	//將IP轉換成網絡可識別形式
	inet_aton(argv[1],&c_addr.sin_addr);
	
	//2.connect
	if(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr))== -1)
	{
		perror("connect");
		exit(-1);
	}
	
	printf("get connect:%s\n",inet_ntoa(c_addr.sin_addr));//把網絡格式的ip地址轉爲字符串形式
	
	while(1)
	{
		if(fork()==0)
		{
			memset(msg,0,sizeof(msg));
			printf("input :");
			gets(msg);
			//3.send
			write(c_fd,msg,strlen(msg));
		}
		//4.read
		n_read=read(c_fd,readBuf,128);
		if(n_read ==-1)
		{
			perror("read");
		}
		else{
			printf("get message from server:%d,%s\n",n_read,readBuf);
		}
		
		
	}
	
	
	
	return 0;
}

聊天軟件小項目

server.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>

int main(int argc,char **argv)//通過傳參來控制IP和端口號
{
	int s_fd;
	char readBuf[128];
	int n_read;
	//char * msg="i get your message";
	
	char msg[128]={0};
	int c_fd;
	
	struct sockaddr_in s_addr;
	struct sockaddr_in c_addr;
	
	
	if(argc!=3)
	{
		printf("param is not good\n");
		exit(-1);
	}
	
	
	
	memset(&s_addr,0,sizeof(struct sockaddr_in));
	memset(&c_addr,0,sizeof(struct sockaddr_in));
	
	
	
	//1.socket
	s_fd = socket(AF_INET,SOCK_STREAM,0);
	if(s_fd == -1)
	{
		perror("socket");
		exit(-1);
	}
	
	
	
	s_addr.sin_family = AF_INET;
	s_addr.sin_port = htons(atoi(argv[2]));//將端口號轉換成網絡可識別形式（字節序）
	//將IP轉換成網絡可識別形式
	inet_aton(argv[1],&s_addr.sin_addr);
	
	//2.bind,使用完struct sockaddr_in這個新版本，要強轉回const struct sockaddr *
	bind(s_fd,(const struct sockaddr *)&s_addr,sizeof(struct sockaddr_in));
	
	//3.listen
	listen(s_fd,10);
	
	//4.accept,第二個參數是客戶端，先不關心客戶端是誰就NULL
	//第三個參數是指針所以要傳地址
	int clen=sizeof(struct sockaddr_in);
	while(1)
	{
		
		c_fd = accept(s_fd,(struct sockaddr *)&c_addr,&clen);//套接字s_fd已經連接上客戶端，後續操作用返回值c_fd來操作
		
		if(c_fd == -1)
		{
			perror("accept");
			
		}
		printf("get connect:%s\n",inet_ntoa(c_addr.sin_addr));//把網絡格式的ip地址轉爲字符串形式
		
		if(fork()==0)
		{
			if(fork()==0)
			{
				while(1)
				{
					memset(msg,0,sizeof(msg));
					printf("input: ");
					gets(msg);
					//6.write
					write(c_fd,msg,strlen(msg));
				}
			}
			while(1)
			{
				//5.read
				memset(readBuf,0,sizeof(readBuf));
				n_read=read(c_fd,readBuf,128);
				if(n_read ==-1)
				{
					perror("read");
				}
				else{
					printf("get message:%d,%s\n",n_read,readBuf);
				}
			}
			break;
		}
		
	
	}
	return 0;
}

client.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>

int main(int argc,char **argv)
{
	int c_fd;
	char readBuf[128];
	int n_read;
	//char * msg="message from client";
	char msg[128]={0};
	
	struct sockaddr_in c_addr;
	
	if(argc!=3)
	{
		printf("param is not good\n");
		exit(-1);
	}
	
	memset(&c_addr,0,sizeof(struct sockaddr_in));
	
	
	
	//1.socket
	c_fd = socket(AF_INET,SOCK_STREAM,0);
	if(c_fd == -1)
	{
		perror("socket");
		exit(-1);
	}
	
	
	
	c_addr.sin_family = AF_INET;
	c_addr.sin_port = htons(atoi(argv[2]));//將端口號轉換成網絡可識別形式（字節序）
	//將IP轉換成網絡可識別形式
	inet_aton(argv[1],&c_addr.sin_addr);
	
	//2.connect
	if(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr))== -1)
	{
		perror("connect");
		exit(-1);
	}
	
	printf("get connect:%s\n",inet_ntoa(c_addr.sin_addr));//把網絡格式的ip地址轉爲字符串形式
	
	while(1)
	{
		if(fork()==0)
		{
			while(1)
			{
				memset(msg,0,sizeof(msg));
				printf("input :");
				gets(msg);
				//3.send
				write(c_fd,msg,strlen(msg));
			}
		}
		while(1)
		{
			//4.read
			memset(readBuf,0,sizeof(readBuf));
			n_read=read(c_fd,readBuf,128);
			if(n_read ==-1)
			{
				perror("read");
			}
			else{
				printf("get message from server:%d,%s\n",n_read,readBuf);
			}
		}
		
	}
	
	
	
	return 0;
}