//自己在写的时候碰到的坑
1.注意服务器端serv_adr.sin_addr.s_addr=htonl(INADDR_ANY)写成inet_addr(INADDR_ANY)就是错的
2.注意客户端serv_adr.sin_addr.s_addr=inet_addr(argv[1]);写成htonl(argv[1])就是错的
3.注意while((str_len=read(clnt_sock,message,BUF_SIZE))!=0)不要写成while(str_len=read(clnt_sock,message,BUF_SIZE)!=0)少个括号
4.1 2l两点看函数原型就知道错在哪儿了,参数类型不匹配 第3点隐蔽性很高因为即使写错了还是能通过编译 只是运行不是预期的结果 debug起来很但疼
//源码服务器端:
#include
#include
#include
#include
#include
#include
#define BUF_SIZE 1024
void error_handling(char *message);
int main(int argc,char *argv[])
{
int serv_sock,clnt_sock;
char message[BUF_SIZE];
int str_len,i;
struct sockaddr_in serv_adr,clnt_adr;
socklen_t clnt_adr_sz;
if(argc!=2)
{
printf("Usage : %s \n",argv[0]);
exit(1);
}
serv_sock=socket(PF_INET,SOCK_STREAM,0);
if(serv_sock==-1)
error_handling("socket() error");
memset(&serv_adr,0,sizeof(serv_adr));
serv_adr.sin_family=AF_INET;
serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
serv_adr.sin_port=htons(atoi(argv[1]));
if(bind(serv_sock,(struct sockaddr*)&serv_adr,sizeof(serv_adr))==-1)
error_handling("bind() error");
if(listen(serv_sock,5)==-1)
error_handling("listen() error");
clnt_adr_sz=sizeof(clnt_adr);
for(int i=0;i<5;++i)
{
clnt_sock=accept(serv_sock,(struct sockaddr*)&clnt_adr,&clnt_adr_sz);
if(clnt_sock==-1)
error_handling("accept() error");
else
printf("Connected client %d \n",i+1);
while( (str_len=read(clnt_sock,message,BUF_SIZE) )!=0 )
write(clnt_sock,message,str_len);
close(clnt_sock);
}
close(serv_sock);
return 0;
}
void error_handling(char *message)
{
fputs(message,stderr);
fputc('\n',stderr);
exit(1);
}
//客户端源码:
#include
#include
#include
#include
#include
#include
void error_handling(char *message)
{
printf("%s\n",message);
exit(1);
}
const int MAXN=(1<<10);
int main(int argc,char *argv[])
{
int clnt_sock;
struct sockaddr_in serv_adr;
char msg[MAXN];
char store[MAXN];
int str_len,str_cnt;
if(argc!=3)
{
printf("Usage %s \n",argv[0]);
exit(1);
}
clnt_sock=socket(PF_INET,SOCK_STREAM,0); //第一步
if(clnt_sock==-1)
error_handling("socket() error");
memset(&serv_adr,0,sizeof(serv_adr)); //填写要连接的服务器端地址
serv_adr.sin_family=AF_INET;
serv_adr.sin_addr.s_addr=inet_addr(argv[1]); //写成htonl(argv[1])就是错,因为htonl()函数的参数要求为unsigned long而argv[1]却是字符串
serv_adr.sin_port=htons(atoi(argv[2]));
if(connect(clnt_sock,(struct sockaddr*)&serv_adr,sizeof(serv_adr))==-1) //第二步
error_handling("connect() error");
while(1)
{
printf("send message to server(input q/Q to exit):");
scanf("%s",msg);
if(!strcmp(msg,"q")||!strcmp(msg,"Q"))
break;
str_len=write(clnt_sock,msg,strlen(msg));
str_cnt=0;
while(str_cnt