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標(biāo)題: 看看socket編程問(wèn)題出在哪里 [打印本頁(yè)]

作者: wangrenjun12 時(shí)間: 2008-04-29 08:08
標(biāo)題: 看看socket編程問(wèn)題出在哪里
小弟現(xiàn)在學(xué)習(xí)Socket編程。打算實(shí)現(xiàn)一個(gè)server.c接受客戶端的連接。從客戶端接收到的字符串打印出來(lái)�？蛻舳艘恢苯邮沼脩舻妮斎�，并且把字符串發(fā)送到服務(wù)器端上。
但是服務(wù)器端運(yùn)行到打�。骸癗ow The server receiver client information.”這句話后一直不能顯示客戶端發(fā)送的字符串。
期待各位解答

server.c代碼如下

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/socket.h>

#define PORT 5000                   // The port which is communicate with server

#define BACKLOG 10
#define LENGTH 512                   // Buffer length

int main ()
{ int sockfd;                      // Socket file descriptor

int nsockfd;                      // New Socket file descriptor

int num;
int size;
int sin_size;                   // to store struct size

  //  char sdbuf[LENGTH];             // Send buffer

char recvbuf[LENGTH];
struct sockaddr_in addr_local;
struct sockaddr_in addr_remote;
char sendstr[16]= {"123456789 abcde"};

/* Get the Socket file descriptor */
if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 )
{
      printf ("ERROR: Failed to obtain Socket Despcritor.\n");
      return (0);
}
else
{
      printf ("OK: Obtain Socket Despcritor sucessfully.\n");
}

/* Fill the local socket address struct */
bzero(&addr_local,sizeof(addr_local));
addr_local.sin_family = AF_INET;          // Protocol Family

addr_local.sin_port = htons(PORT);       // Port number

addr_local.sin_addr.s_addr  = htons(INADDR_ANY);  // AutoFill local address

if( bind(sockfd, (struct sockaddr*)&addr_local, sizeof(struct sockaddr)) == -1 )
{
      printf ("ERROR: Failed to bind Port %d.\n",PORT);
      return (0);
}
else
{
      printf("OK: Bind the Port %d sucessfully.\n",PORT);
}

/*  Listen remote connect/calling */
if(listen(sockfd,BACKLOG) == -1)
{
      printf ("ERROR: Failed to listen Port %d.\n", PORT);
      return (0);
}
else
{
      printf ("OK: Listening the Port %d sucessfully.\n", PORT);
}

while(1)
{
      sin_size = sizeof(struct sockaddr_in);
      if ((nsockfd = accept(sockfd, (struct sockaddr *)&addr_remote, &sin_size)) == -1)
      {
         printf ("ERROR: Obtain new Socket Despcritor error.\n");
         continue;
      }
      else
      {
   printf ("OK: Server has got connect from %s.\n", inet_ntoa(addr_remote.sin_addr));
      }


      printf("Now The server receiver client information.\n");
      size=recv(nsockfd,recvbuf,LENGTH,0);
   if(size<0)
   {
printf("read socket information error from %",inet_ntoa(addr_remote.sin_addr));
      }
else
printf("receiver from  client informationis %s",recvbuf);
   }
   close(nsockfd);

}

client.c代碼如下

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

#define PORT 5000                   // The port which is communicate with server

#define LENGTH 256                   // Buffer length

int main(int argc, char *argv[])
{
int sockfd;                      // Socket file descriptor

int num;                         // Counter of received bytes

struct sockaddr_in remote_addr; // Host address information

char sendbuf[LENGTH];
char server_addr[]="192.168.1.114";
char writebuf[LENGTH];

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
      printf("ERROR: Failed to obtain Socket Descriptor!\n");
      return (0);
}

/* Fill the socket address struct */
remote_addr.sin_family = AF_INET;                // Protocol Family

remote_addr.sin_port = htons(PORT);                // Port number

inet_pton(AF_INET, server_addr, &remote_addr.sin_addr); // Net Address

bzero(&(remote_addr.sin_zero), 8);                // Flush the rest of struct

/* Try to connect the remote */
if (connect(sockfd, (struct sockaddr *)&remote_addr,  sizeof(struct sockaddr)) == -1)
{
      printf ("ERROR: Failed to connect to the host!\n");
      return (0);
}
else
{
      printf ("OK: Have connected to the server\n");
}

while(1)
{
      printf("Please input information to send\n");
      scanf("%s",&sendbuf);
      printf("your iunput information is %s. \n",sendbuf);
      send(sockfd,sendbuf,LENGTH,0);
}

close (sockfd);
return (0);
}

作者: wangrenjun12 時(shí)間: 2008-04-29 08:34
自己先頂一個(gè)

作者: lishengxu 時(shí)間: 2008-04-29 08:57
你把服務(wù)中的accept放到while的外邊看看

作者: wangrenjun12 時(shí)間: 2008-04-29 09:35
是while的問(wèn)題

作者: 5毛黨黨員 時(shí)間: 2008-04-29 10:25
還沒(méi)有接收到數(shù)據(jù)呢，就又開始等待連接了

作者: zidane2007 時(shí)間: 2008-04-29 14:59
你這個(gè)port設(shè)為5000，沒(méi)有問(wèn)題嗎？
你自己gdb看過(guò)后，應(yīng)該sockaddr_in.sin_port=0吧！

作者: tyz 時(shí)間: 2008-04-29 18:45
while中的
if ((nsockfd = accept(sockfd, (struct sockaddr *)&addr_remote, &sin_size)) == -1)
      {
         printf ("ERROR: Obtain new Socket Despcritor error.\n");
         continue;
      }
      else
      {
   printf ("OK: Server has got connect from %s.\n", inet_ntoa(addr_remote.sin_addr));
      }

放到外面
你這個(gè)是單用戶的TCP連接，只要accept一次就好，如果想做并發(fā)的服務(wù)器，可以考慮使用子進(jìn)程，使用fork（）完成并發(fā)操作，實(shí)現(xiàn)多哥客戶端同時(shí)訪問(wèn)

作者: 很平凡的Man 時(shí)間: 2008-05-12 09:39
很強(qiáng)大

作者: scutan 時(shí)間: 2008-05-12 13:18
其實(shí)接收端是收到了的，但是由于行緩沖的原因，你程序暫時(shí)還沒(méi)有把收到的數(shù)據(jù)打印出來(lái)。另外，你的發(fā)送端也有問(wèn)題。
好好看看APUE和UNP吧。

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