socket,我错在哪儿了?
发表于 : 2008-10-09 11:45
我写了个socket程序,但不知道错在哪里了,就是收不到数据。
打印错误代码errno,说是bad address,郁闷啊,帮我找找什么原因。
代码如下:
注意把相应的IP改为发送接受的IP,1124端口是我自己选择的,可以换成别的值。
代码: 全选
//send_main.c
#include <stdio.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
int main()
{
int sock;
int addrlen = sizeof(struct sockaddr);
struct sockaddr_in server;
struct sockaddr_in myaddr;
memset(&server, 0, addrlen);
unsigned char buf[4];
memset(buf, 0, 4);
if((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
{
printf("socket create error\n");
return -1;
}
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr("192.168.10.23");
server.sin_port = htons(1124);
*(int*)buf = 10;
if(sendto(sock, buf, 4, 0,
(struct sockaddr*)&server, addrlen) == -1)
{
printf("recv_notify : recvfrom error \n");
return -1;
}
close(sock);
}
//-----------------------------------------------------------------------------------------------------------------
//recv_main.c
#include <stdio.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <errno.h>
int main()
{
int sock;
socklen_t client_addrlen;
int addrlen = sizeof(struct sockaddr);
struct sockaddr_in server;
struct sockaddr_in client;
memset(&server, 0, addrlen);
memset(&client, 0, addrlen);
int recvlen;
unsigned char buf[4];
memset(buf, 0, 4);
if((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
{
printf("socket create error\n");
return -1;
}
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr("192.168.10.23");
server.sin_port = htons(1124);
if(bind(sock, (struct sockaddr*)&server, addrlen) == -1)
{
printf("socket bind error\n");
close(sock);
return -1;
}
if(recvfrom(sock, buf, 4, 0, (struct sockaddr*)&client, (socklen_t*)client_addrlen) == -1)
{
printf("recv_notify : recvfrom error %d\n", errno);
return -1;
}
close(sock);
}
//-----------------------------------------------------------------------------------------------------------------
Makefile
all:recv send
recv:
gcc -g -o recv recv_main.c
send:
gcc -g -o send send_main.c
clean:
rm -f *~ recv send