1.Cè¯è¨UDPåè®®
2.c++与matlab的udp通信问题
3.Windows下C语言多线程实现UDP通信程序recvfrom()函数出现10054错误:远程主机强迫关闭了一个现有的连接。
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ç®åçå¦ä¹ 代ç ï¼ä» ä¾åèï¼server.c
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define SERVICE_PORT
#define BUFSIZE
#define HEAD 4
int main(int argc, char **argv)
{
struct sockaddr_in myaddr; /* our address */
struct sockaddr_in remaddr; /* remote address */
socklen_t addrlen = sizeof(remaddr); /* length of addresses */
int recvlen; /* # bytes received */
int fd; /* our socket */
int msgcnt = 0; /* count # of messages we received */
unsigned char buf[BUFSIZE]="ret_"; /* receive buffer */
/* create a UDP socket */
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("cannot create socket\n");
return 0;
}
/* bind the socket to any valid IP address and a specific port */
memset((char *)&myaddr, 0, sizeof(myaddr));
myaddr.sin_family = AF_INET;
myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
myaddr.sin_port = htons(SERVICE_PORT);
if (bind(fd, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
perror("bind failed");
return 0;
}
/* now loop, receiving data and printing what we received */
for (;;)
{
printf("waiting on port %d\n", SERVICE_PORT);
recvlen = recvfrom(fd, buf+HEAD, BUFSIZE, 0, (struct sockaddr *)&remaddr, &addrlen);
if (recvlen > 0)
{
buf[HEAD+recvlen] = 0;
printf("received message: \"%s\" (%d bytes)\n", buf+HEAD, recvlen);
}
else
{
printf("uh oh - something went wrong!\n");
}
printf("sending response \"%s\"\n", buf);
if (sendto(fd, buf, strlen(buf), 0, (struct sockaddr *)&remaddr, addrlen) < 0)
{
perror("sendto");
}
}
close(fd);
return 0;
}
client.c
#include <stdlib.h>#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#define SERVICE_PORT
#define BUFLEN
int main( int argc,char* argv[] )
{
struct sockaddr_in myaddr, remaddr;
int fd, i, slen=sizeof(remaddr);
char sendbuf[BUFLEN]="hello"; /* message buffer */
char readbuf[BUFLEN]={ 0};
int recvlen; /* # bytes in acknowledgement message */
char *server = ".0.0.1"; /* change this to use a different server */
/* create a socket */
if ((fd=socket(AF_INET, SOCK_DGRAM, 0))==-1)
{
printf("socket created\n");
}
/* bind it to all local addresses and pick any port number */
memset((char *)&myaddr, 0, sizeof(myaddr));
myaddr.sin_family = AF_INET;
myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
myaddr.sin_port = htons(0);
if (bind(fd, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0)
{
perror("bind failed");
return 0;
}
memset((char *) &remaddr, 0, sizeof(remaddr));
remaddr.sin_family = AF_INET;
remaddr.sin_port = htons(SERVICE_PORT);
if (inet_aton(server, &remaddr.sin_addr)==0)
{
fprintf(stderr, "inet_aton() failed\n");
exit(1);
}
printf("Sending packet %d to %s port %d\n", i, server, SERVICE_PORT);
if (sendto(fd, sendbuf, strlen(sendbuf), 0, (struct sockaddr *)&remaddr, slen)==-1)
{
perror("sendto");
exit(1);
}
/* now receive an acknowledgement from the server */
recvlen = recvfrom(fd, readbuf, BUFLEN, 0, (struct sockaddr *)&remaddr, &slen);
if ( recvlen >= 0 )
{
readbuf[recvlen] = 0; /* expect a printable string - terminate it */
printf("received message: \"%s\"\n", readbuf);
}
close(fd);
return 0;
}
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c++与matlab的udp通信问题
@首先,UDP是一种协议,它无关,与具体的tomcat源码编译打包实现语言,用C + +和C#的怎么判断源码正负UDP程序编写的程序能够完全UDP通信,不受编程语言
影响@在我认为,上述的C + +代码来调用connect函数,但连接在上述相应位置使用TCP协议的一个函数使用bind函数,具体实现你自己找
@在总之,我的看法是,你的C + +似乎是通信协议TCP代码,它不是检测公司网站源码决定性的和下方的UDP协议通信的代码
Windows下C语言多线程实现UDP通信程序recvfrom()函数出现错误:远程主机强迫关闭了一个现有的连接。
在进行Windows下C语言多线程实现UDP通信程序时,遇到recvfrom()函数出现错误的情况。问题在于将recvfrom函数置于一路线程中,而sendto函数置于主线程中。半山指标公式源码此错误被发现源于Windows socket的一个bug,在UDP Socket发送数据后收到不可达ICMP包时,此错误会在下一次接收时返回,导致recvfrom()函数返回SOCKET_ERROR,discuz手机APP源码错误代码为。
解决此问题的方法之一是直接忽略这个错误,通过在接收数据的代码段中添加条件判断,如if ( == a) continue;这样当接收到错误时,程序会跳过该错误并继续运行。这解决了问题,使得在启动对端程序时能够正常通信。但该方法是否准确以及是否对程序的后续运行有影响,仍需要进一步验证。
另一种网上查询到的解决方案是在sendto函数前添加相应的代码。此方法经过测试,效果良好。通过调整程序结构,使得错误处理更合理,从而确保了通信的稳定性。这为解决recvfrom()函数出现错误提供了一个实用的方法。