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所以我环顾四周,发现有类似的问题,以我的一些人接受。但是我还没有找到解决方案。我使用UDP在Unix(Cygwin)中创建了一个客户端和服务器。当我尝试使用sendto()从客户端向服务器发送消息时,服务器似乎没有收到数据包。我做了错误检查,看起来客户端没有问题发送数据包,但服务器仍然无法正确接收。服务器似乎大部分已经死亡。我正在使用我的机器来托管客户端和服务器,我试图连接到我的家乡地址(127.0.0.1)和随机端口上的服务器。任何建议在这一点上将不胜感激。UDP服务器没有进入Unix(Cygwin的)
服务器代码:
#include <stdio.h> /* standard C i/o facilities */
#include <stdlib.h> /* needed for atoi()/atof() */
#include <unistd.h> /* Unix System Calls */
#include <sys/types.h> /* system data type definitions */
#include <sys/socket.h> /* socket specific definitions */
#include <netinet/in.h> /* INET constants and stuff */
#include <arpa/inet.h> /* IP address conversion stuff */
#include <string.h> /* String manipulation */
#include <time.h> /* Used to to measure process execution time */
/* Server main routine - this is an iterative server
1. create a socket
2. bind the socket and print out the port number assigned
3. do forever
get next connection
handle the connection
enddo
*/
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr, cliaddr;
int n;
//Create UDP socket
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("Problem creating socket\n");
exit(1);
}
//Setup the UDP server
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(0);
//Bind the UDP to the socket
if (bind(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr))<0)
{
perror("Error bind\n");
exit(1);
}
//Print the port for the UDP server
int length = sizeof(servaddr);
if (getsockname(sockfd, (struct sockaddr *) &servaddr, &length) < 0)
{
perror("Error getsockname\n");
exit(1);
}
printf("The Server passive socket port number is %d\n",ntohs(servaddr.sin_port));
//Send/Recv from client
char msg[100];
for(;;)
{
socklen_t len = sizeof(cliaddr);
if(recvfrom(sockfd, msg, 100, 0, (struct sockaddr*) &cliaddr, &len) < 0)
{
perror("Error on recv\n");
exit(1);
}
printf("Msg: %s\n", msg);
//read(sockfd, msg, 10);
//sendto(sockfd, msg, n, 0, (struct sockaddr*) &cliaddr, len);
}
close(sockfd);
return 0;
}
客户端代码:
#include <stdio.h> /* standard C i/o facilities */
#include <stdlib.h> /* needed for atoi() */
#include <unistd.h> /* Unix System Calls */
#include <sys/types.h> /* system data type definitions */
#include <sys/socket.h> /* socket specific definitions */
#include <netinet/in.h> /* INET constants and stuff */
#include <arpa/inet.h> /* IP address conversion stuff */
#include <string.h>
/* client program:
The following must passed in on the command line:
name of the server (argv[1])
port number of the server (argv[2])
*/
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;
int n;
//Ensure we have full args
if (argc != 3)
{
printf("Usage: client <server name> <server port>\n");
exit(1);
}
//Setup the port number
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(atoi(argv[2]));
//Setup the client IP
//inet_pton(AF_INET, argv[1], &servaddr.sin_addr)) <= 0
if(inet_aton(argv[1], &servaddr.sin_addr) == 0)
{
perror("Error with server IP\n");
exit(1);
}
//Create socket
if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror("Error on socket\n");
exit(1);
}
/*if (connect(sockfd,(struct sockaddr *) &servaddr, sizeof(servaddr)) < 0)
{
printf("Problem connecting socket\n");
exit(1);
}*/
//Send msg
char msg[10] = "123456789";
for(;;)
{
socklen_t len = sizeof(servaddr);
if((sendto(sockfd, msg, strlen(msg), 0, (struct sockaddr*) &servaddr, len)) < 0)
{
perror("Error on sendto():\n");
exit(1);
}
//write(sockfd, msg, strlen(msg));
//n = recvfrom(sockfd, msg2, 10, 0, NULL, NULL);
//printf("Msg: %s\n", msg2);
}
close(sockfd);
return 0;
}
哇谢谢。我不敢相信我看着插座。我只是相信这是另一回事。我还考虑了您的其他提示,并且已经为他们调整了我的代码。再次感谢。 –