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socket,我错在哪儿了?

发表于 : 2008-10-09 11:45
zongzw
:em20

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


Re: socket,我错在哪儿了?

发表于 : 2008-10-09 16:35
zongzw
知道错在哪里了
recv_main.c文件中的recvfrom第6个参数前面加一个'&',即类型转换时应该传递一个地址,而我传递成了数值。
:em03

Re: socket,我错在哪儿了?

发表于 : 2008-11-06 12:58
Flashboy
想学网络,留个脚印。