【更适合初学者的开发板ELF 1】11-TCP编程及测试

stm1024

本帖最后由 stm1024 于 2023-12-7 09:41 编辑

上次测试了UCP，自然的，TCP的测试也安排上。

1. 编程规划
本次需要分别实现一个TCP服务端的程序，以及一个TCP客户端的程序。两次程序都在ELF-1上运行，当运行服务端程序时，在Windows中运行网络调试助手，将其作为客户端程序；当运行客户端程序时，在Windows中运行网络调试助手，将其作为服务端程序。

2. 编写程序
先写个服务端程序，运行在ELF-1开发板上：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
void dispErrInfo(const char* pretext,int errcode)
{
printf("%s, errno=%d: %s\n",pretext,errcode,strerror(errcode));
}
char msg[256]="hello, client.";
char rxbuf[256];
int main()
{
int sktfd,ret,newsktfd;
struct sockaddr_in saddr;
struct sockaddr_in caddr;
int caddr_size,nbytes;
sktfd=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(sktfd<0)
{
dispErrInfo("create socket failed, ",errno);
return errno;
}
printf("create socket with fd=%d.\n",sktfd);
memset(&saddr,0,sizeof(saddr));
saddr.sin_family=AF_INET;
saddr.sin_addr.s_addr=htonl(INADDR_ANY);
saddr.sin_port=htons(12345);
ret=bind(sktfd,(struct sockaddr*)(&saddr),sizeof(saddr));
if(ret<0)
{
dispErrInfo("bind failed",errno);
return errno;
}
ret=listen(sktfd,5);
if(ret<0)
{
dispErrInfo("listen failed",errno);
return errno;
}
printf("Listening...\n");
caddr_size=sizeof(caddr);
newsktfd=accept(sktfd, (struct sockaddr*)(&caddr),(socklen_t*)(&caddr_size));
if(newsktfd<0)
{
dispErrInfo("accept failed",errno);
return errno;
}
//print IP & port of connected client
//**********************************
int n=caddr.sin_addr.s_addr;
printf("Client IP:");
while(n)
{
printf("%d",n%256);
n/=256;
if(n!=0)
printf(".");
}
printf(" Port=%d\n",caddr.sin_port);
//***********************************
//send message to client
while(1)
{
memset(rxbuf,0x00,256);
nbytes=read(newsktfd,rxbuf,256);
if(nbytes>0)
{
printf("Received from Client:\t%s\n",rxbuf);
write(newsktfd, msg, sizeof(msg));
if(strcmp(rxbuf,"exit")==0)
break;
}
}
close(newsktfd);
close(sktfd);
return 0;
}

复制代码

测试效果如下：

客户端程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
void dispErrInfo(const char* pretext,int errcode)
{
printf("%s, errno=%d: %s\n",pretext,errcode,strerror(errcode));
}
int main()
{
int sktfd,ret,x=0;
struct sockaddr_in saddr;
char txbuf[256];
sktfd=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
if(sktfd<0)
{
dispErrInfo("create socket failed, ",errno);
return errno;
}
printf("create socket with fd=%d.\n",sktfd);
memset(&saddr,0,sizeof(saddr));
saddr.sin_family=AF_INET;
saddr.sin_addr.s_addr=inet_addr("192.168.1.102");
saddr.sin_port=htons(12345);
ret=connect(sktfd,(struct sockaddr*)&saddr,sizeof(saddr));
if(sktfd<0)
{
dispErrInfo("connect failed, ",errno);
return errno;
}
while(1)
{
memset(txbuf,0,256);
sprintf(txbuf,"hi there %d\n",x++);
write(sktfd,txbuf,strlen(txbuf));
sleep(1);
}
return 0;
}

复制代码

在Windows主机中启动网络调试助手，以TCP服务器打开，测试效果如下：

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