服务器客户端通信问题

2004-09-12 07:09:26 281 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

多个客户端与一个服务器端通信的问题多个客户端与一个服务器端通信的问题上篇博文主要是讲的关于客户端与服务器端的通信问题，在上篇博文中当我们只有一个客户端访问我们的服务器时是可以正常运行的，但是当我们有多个客户端访问我们的服务器时，我们的代码就不能正常工作了。而在现实中，我们是很少有一个服务器只供一个客户端访问的，此篇博文就是来解决多个客户端访问我们服务器端的问题。解决方法：用一个多线程就可以解决阅读详情

想用Linux做服务器，Windows为客户端实现通信问题，照着书上写了服务器端的程序，出现问题，请高手帮忙解决一下。

...全文

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caiyuanyuan 2004-09-24

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好像不能在一台Linux操作系统中同时运行服务器客户端程序呀，我以前用VB编程可以在机子里面同时运行的

caiyuanyuan 2004-09-24

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也谢谢阿鱼木木：）

caiyuanyuan 2004-09-24

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太好了，谢谢fengge8ylf

winux0 2004-09-17

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客户端：
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

char *msg = "HELLO";

int main()
{
int sockfd;
struct sockaddr_in dest_addr;

char buff[20];

sockfd = socket( AF_INET, SOCK_STREAM, 0 );
dest_addr.sin_family = AF_INET;
dest_addr.sin_port = htons( 5050 );
dest_addr.sin_addr.s_addr = inet_addr( "192.168.8.201" );

connect( sockfd, (struct sockaddr*)&dest_addr, sizeof(struct sockaddr));
send( sockfd, msg, strlen(msg), 0 );
recv( sockfd, buff, 20, 0 );
printf( "%s\n",buff );
close( sockfd );
return 0;
}
服务器端：
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main()
{
int sockfd, newfd;
char buff[20];
struct sockaddr_in my_addr;
struct sockaddr_in other_addr;
int sin_size;
sockfd = socket( AF_INET, SOCK_STREAM, 0);
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons( 5050 );
my_addr.sin_addr.s_addr = INADDR_ANY;
bzero(&(my_addr.sin_zero), 8);
bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr));
listen(sockfd, 1);
// sin_size = sizeof(struct sockaddr_in);
printf( "1\n" );
newfd = accept( sockfd, &other_addr, &sin_size );
printf( "2\n" );
printf( "%s:%d CONNECTED\n", inet_ntoa(other_addr.sin_addr), ntohs(other_addr.sin_port) );
recv( newfd, buff, 20, 0 );
printf( "%s\n",buff );
memset( buff, 0 , 20 );
strcpy( buff, inet_ntoa(other_addr.sin_addr) );
send( newfd, buff, strlen(inet_ntoa(other_addr.sin_addr)),0 );
close( sockfd) ;
}

fengge8ylf 2004-09-17

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想要的话我发给你一个不过下个礼拜才能给你

starstargao 2004-09-16

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你看一下TCP/IP高级编程,看不懂来问

caiyuanyuan 2004-09-15

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那是书上写错了，我发现好多书上的程序都有低级错误
哪位大侠有Linux服务器和Windows客户端通信的程序呀？

starstargao 2004-09-14

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小妹妹，你写程序太不仔细了，
sprintf()写错
还有你封装write_all和read_all的在那里

starstargao 2004-09-14

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这种错误一般都是你联接头文件出错，你应该仔细检查一下头文件包含的路径，和你自己的程序，和头文件没有关系

caiyuanyuan 2004-09-13

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自己顶

caiyuanyuan 2004-09-13

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caiyuanyuan 2004-09-13

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但是给的是头文件错误呀,难道要一个个修改头文件呀?

icewolf_li 2004-09-13

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全是语法错误。编译器已经把错误定位的很清楚拉，自己一个个照着去检查不就得了。

caiyuanyuan 2004-09-12

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楼上的给一点提示呀!

city_goal 2004-09-12

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哦，好多简单的错误哦。。。。。。
慢慢来，会提高效率的。。

caiyuanyuan 2004-09-12

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编译gcc -Wall -o ss ss.c出现问题如下：
ss.c:1: parse error before "buffer"
ss.c:1:36: missing terminating ' character
ss.c:1:36: warning: character constant too long
ss.c:2: parse error before "you"
ss.c:2: warning: type defaults to `int' in declaration of `file'
ss.c:2: warning: type defaults to `int' in declaration of `first'
ss.c:2: parse error before "visit"
ss.c:3: parse error before "enter"
ss.c:3:36: missing terminating ' character
ss.c:3:36: warning: character constant too long
In file included from ss.c:5:
/usr/include/string.h:39: parse error before "size_t"
/usr/include/string.h:42: parse error before "size_t"
/usr/include/string.h:51: parse error before "size_t"
/usr/include/string.h:58: parse error before "size_t"
/usr/include/string.h:61: parse error before "size_t"
/usr/include/string.h:65: parse error before "size_t"
/usr/include/string.h:86: parse error before "size_t"
/usr/include/string.h:93: parse error before "size_t"
/usr/include/string.h:99: parse error before "size_t"
/usr/include/string.h:106: parse error before "strxfrm"
/usr/include/string.h:107: parse error before "size_t"
/usr/include/string.h:176: parse error before "strcspn"
/usr/include/string.h:180: parse error before "strspn"
/usr/include/string.h:230: parse error before "strlen"
/usr/include/string.h:248: parse error before "size_t"
/usr/include/string.h:253: parse error before "size_t"
/usr/include/string.h:257: parse error before "size_t"
/usr/include/string.h:260: parse error before "size_t"
/usr/include/string.h:263: parse error before "size_t"
/usr/include/string.h:291: parse error before "size_t"
In file included from /usr/include/sys/types.h:266,
from ss.c:6:
/usr/include/bits/pthreadtypes.h:48: parse error before "size_t"
/usr/include/bits/pthreadtypes.h:51: parse error before "__stacksize"
In file included from /usr/include/sys/uio.h:29,
from /usr/include/sys/socket.h:27,
from ss.c:7:
/usr/include/bits/uio.h:45: parse error before "size_t"
In file included from /usr/include/sys/socket.h:35,
from ss.c:7:
/usr/include/bits/socket.h:221: parse error before "size_t"
/usr/include/bits/socket.h:224: parse error before "msg_controllen"
/usr/include/bits/socket.h:227: parse error before '}' token
/usr/include/bits/socket.h:232: parse error before "size_t"
/usr/include/bits/socket.h:239: parse error before '}' token
In file included from ss.c:7:
/usr/include/sys/socket.h:131: parse error before "size_t"
/usr/include/sys/socket.h:136: parse error before "size_t"
/usr/include/sys/socket.h:141: parse error before "size_t"
/usr/include/sys/socket.h:149: parse error before "size_t"
In file included from /usr/include/_G_config.h:44,
from /usr/include/libio.h:32,
from /usr/include/stdio.h:72,
from ss.c:9:
/usr/include/gconv.h:72: parse error before "size_t"
/usr/include/gconv.h:88: parse error before "size_t"
/usr/include/gconv.h:97: parse error before "size_t"
/usr/include/gconv.h:174: parse error before "size_t"
/usr/include/gconv.h:177: parse error before '}' token
In file included from /usr/include/libio.h:32,
from /usr/include/stdio.h:72,
from ss.c:9:
/usr/include/_G_config.h:47: field `__cd' has incomplete type
/usr/include/_G_config.h:50: field `__cd' has incomplete type
/usr/include/_G_config.h:52: confused by earlier errors, bailing out

caiyuanyuan 2004-09-12

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#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <netdb.h>

#define MAX_BUF_SIZE 1024
#define SERVER_PORT 8080
#define BACKLOG 5
int main(int argc,char *argv[])
{
int listenfd,connfd;
struct sockaddr_in servaddr;
listenfd=socket(AF_INET,SOCK_STREAM,0); //use the function socket to create a socket
if (listenfd<0) {
fprintf(stderr,"Socket error\n");
exit(1);
}
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
servaddr.sin_addr.s_addr= htonl(INADDR_ANY); //the server's ip is INADDR_ANY,that is it can accept the request of client
//from any net device.
servaddr.sin_port=htons(SERVER_PORT);
if (bind(listenfd,(struct sockaddr *)&servaddr,sizeof(servaddr))<0) {
fprintf(stderr,"Bind error\n");
exit(1);
}
if (listen(listenfd,BACKLOG)<0) { //BACKLOG is the biggest unaccepted number which client request.
fprintf(stderr,"Listen error\n");
exit(1);
}
for (;;) {
connfd=accept(listenfd,NULL,NULL);
if (connfd<0) {
fprintf(stderr,"Accept error\n");
exit(1);
}
serv_respon(connfd);
close(connfd);
}
close(listenfd);
}

void serv_respon(int sockfd)
{
int nbytes;
char buf[1024];
for (;;) {
nbytes=read_requ(sockfd,buf,1024);
if (nbytes==0)
return ;
else if(nbytes<0) {
fprintf(stderr,"read error: %s\n",strerror(errno));
return ;
}
if (write_all(sockfd,buf,nbytes)<0)
fprintf(stderr,"write error:%s\n",strerror(errno));
}
}
int read_requ(int sockfd,char *buf,int size)
{
char inbuf[256];
int n;
int i;
i=read_line(sockfd,inbuf,256);
if(i<0)
return(i);
else if(i==0)
return(0); //the customer has closed the connect
if(strncmp(inbuf,"Length",6)==0)
sscanf(buf+6,"%d",&n);
else {
spintf(buf,"Invalid option",14);
return(14);
}
return(read_all(sockfd,buf,n));
}

int get_char(int fd,char *ch)
{
static int offset=0;
static int size=0;
static char buf[MAX_BUF_SIZE];
for (;size<=0||offset==size;){
size=read(fd,buf,MAX_BUF_SIZE);
if(size<0)
{
if(errno==EINTR)
{
size=0;
continue;
}
else
return(-1);
}
offset=0;
}
*ch=buf[offset++];
return(1);
}

int read_line(int fd,char*buf,int maxlen)
{
int i,n;
char ch;
for(i=0;i<maxlen;) {
n=get_char(fd,&ch);
if(n==1) {
buf[i++]=ch;
if(ch=='\n')
break;
} else if(n<0)
return(-1);
else
break;
}
buf[i]='\0';
return(i);
}

没有发现书上给的write－all（）

服务器客户端通信问题

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