Liby’s Blog

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
 
#define PORT_SERVER 9898
 
int main()
{
	int socket_fd;
	int nrecv;
	int size;
	struct sockaddr_in ad_s;
	char buffer[1024];
 
	if((socket_fd=socket(AF_INET,SOCK_DGRAM,0))==-1)
	{
		fprintf(stderr,"socket error\n");
		exit(1);
	}
	bzero(&ad_s,sizeof(ad_s));
	ad_s.sin_family=AF_INET;
	ad_s.sin_addr.s_addr=htonl(INADDR_ANY);
	ad_s.sin_port=htons(PORT_SERVER);
 
	if(bind(socket_fd,(struct sockaddr *)&ad_s,sizeof(ad_s)))
	{
		fprintf(stderr,"bind error\n");
		exit(1);
	}
 
	while(1)
	{
		bzero(buffer,1024);
		size=sizeof(struct sockaddr);
		nrecv=recvfrom(socket_fd,buffer,1024,0,(struct sockaddr *)&ad_s,&size);
		buffer[nrecv]='\0';
		printf("server receive %s\n",buffer);
	}
	close(socket_fd);
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
 
#define PORT_CLIENT 9898
 
int main(int argv,char *argc[])
{
	struct hostent *host;
	if(argv<2)
	{
		perror("parameter error\n");
		exit(1);
	}
	if((host=gethostbyname(argc[1]))==NULL)
	{
		fprintf(stderr,"gethostname error\n");
		exit(1);
	}
 
	int socket_fd;
	struct sockaddr_in ad_s;
	char buffer[1024];
 
	if((socket_fd=socket(AF_INET,SOCK_DGRAM,0))==-1)
	{
		fprintf(stderr,"socket error\n");
		exit(1);
	}
	bzero(&ad_s,sizeof(ad_s));
	ad_s.sin_family=AF_INET;
	ad_s.sin_port=htons(PORT_CLIENT);
	ad_s.sin_addr=*((struct in_addr*)host->h_addr);
 
	while(1)
	{
		printf("input something:\n");
		fgets(buffer,1024,stdin);
 
		if(sendto(socket_fd,buffer,strlen(buffer),0,(struct sockaddr *)&ad_s,sizeof(ad_s))==-1)
		{
			fprintf(stderr,"sendto error\n");
			exit(1);
		}
		bzero(buffer,1024);
	}
	close(socket_fd);
 
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
 
#define PORT_SERVER 9898
 
int main()
{
	int socket_fd,fd;
	int nread;
	int size;
	char buffer[1024];
	struct sockaddr_in ad_s,ad_c;
 
 
	if((socket_fd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		fprintf(stderr,"socket error\n");
		exit(1);
	}
 
	bzero(&ad_s,sizeof(ad_s));
	ad_s.sin_family=AF_INET;
	ad_s.sin_addr.s_addr=htonl(INADDR_ANY);
	ad_s.sin_port=htons(PORT_SERVER);
 
	if(bind(socket_fd,(struct sockaddr *)&ad_s,sizeof(ad_s))==-1)
	{
		fprintf(stderr,"bind error\n");
		exit(1);
	}
 
	if(listen(socket_fd,5)==-1)
	{
		fprintf(stderr,"listen error\n");
		exit(1);
	}
 
	while(1)
	{
		size=sizeof(struct sockaddr_in);
		bzero(buffer,1024);
		if((fd=accept(socket_fd,(struct sockaddr *)&ad_c,&size))==-1)
		{
			fprintf(stderr,"accept error\n");
			exit(1);
		}
		printf("server connect from %s\n",inet_ntoa(ad_c.sin_addr.s_addr));
 
		if((nread=read(fd,buffer,1024))==-1)
		{
			fprintf(stderr,"read error\n");
			exit(1);
		}
		buffer[nread]='\0';
		printf("server receive %s\n",buffer);
		close(fd);
	}
	close(socket_fd);
	exit(0);
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
 
#define PORT_CLIENT 9898
 
int main(int argv,char *argc[])
{
	struct hostent *host;
	if(argv<2)
	{
		perror("parameter error\n");
		exit(1);
	}
	if((host=gethostbyname(argc[1]))==NULL)
	{
		fprintf(stderr,"gethostname error\n");
		exit(1);
	}
 
	int sock_fd;
	struct sockaddr_in ad_s;
	char buffer[1024];
 
	if((sock_fd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		fprintf(stderr,"socket error\n");
		exit(1);
	}
	bzero(&ad_s,sizeof(ad_s));
	ad_s.sin_family=AF_INET;
	ad_s.sin_port=htons(PORT_CLIENT);
	ad_s.sin_addr=*((struct in_addr*)host->h_addr);
 
	if(connect(sock_fd,(struct sockaddr *)&ad_s,sizeof(ad_s))==-1)
	{
		fprintf(stderr,"connect error\n");
		exit(1);
	}
	printf("input something...\n");
	bzero(buffer,1024);
	fgets(buffer,1024,stdin);
	write(sock_fd,buffer,strlen(buffer));
 
	close(sock_fd);
	exit(0);
}

assume cs:code,ds:data
data segment
db	'welcome to masm!'
db	02h,24h,71h
data ends
code segment
start:	mov ax,data
	mov ds,ax
	mov ax,0b872h ;显示位置
	mov es,ax
	mov bp,10h ;颜色02h的位置
 
	mov cx,3	
s:	push cx
	mov di,0
 
	mov cx,16
s1:	mov dl,ds:[di]	;将字符
	mov es:[si],dl	;复制到低字节
	mov dh,ds:[bp]	;将颜色
	mov es:[si+1],dh;复制到高字节
	inc di	;下一字符
	add si,2;加2，颜色为奇地址
	loop s1
 
	add si,80h ;160个字节-32字节跳转到下一行
	add bp,1
	pop cx	
	loop s
 
	mov ax,4c00h 
	int 21h 
 
code ends 
end start