TCP编程的问题

[l999358]

代码如下:

rec.c:
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

#define error(T) {\
	printf("ERROR:");\
	printf(T);\
	fputc ('\n',stdout);\
	getch();\
	return 0;\
	}

WSADATA wsd;
SOCKET mySocket,acSocket;
struct sockaddr_in sa,sac;
int err;
char recvBuf[100];
char ipBuf[20];
short ip;

void myIP(){
	printf ("本机信息:");
	system ("cmd.exe /c ipconfig /all");
}

int main(){
	myIP();
	WSAStartup ( MAKEWORD(2,2), &wsd);
	mySocket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
	sa.sin_family = AF_INET;
	sa.sin_addr.s_addr = htonl (INADDR_ANY);
	sa.sin_port = htons (8080);
	bind (mySocket, (struct sockaddr *)&sa, sizeof(sa));
	err = listen (mySocket, 1);
	if(err == SOCKET_ERROR)error("listen failed!");
	printf ("listen succeed!\n");
	err = sizeof(sac);
	acSocket = accept (mySocket, (struct sockaddr *)&sac, &err);
	if(acSocket == INVALID_SOCKET)error("Accept failed!");
	ip = sac.sin_addr.s_addr;
	sprintf (ipBuf, "%3d.%3d.%3d.%3d", ip&0x000000ff, (ip>>8)&0x000000ff, (ip>>16)&0x000000ff, (ip>>24)&0x000000ff);
	printf ("One computer connect us!: %s\n", ipBuf);
	err = recv (acSocket, recvBuf, 100, 0);
	if(err == SOCKET_ERROR)error("Receive error!");
	printf ("%d bytes received :\n %s", err, recvBuf);
	getch();
	return 0;
}

send.c:
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#define error(T) {\
	printf("ERROR:");\
	printf(T);\
	fputc ('\n',stdout);\
	getch();\
	return 0;\
	}

WSADATA wsd;
SOCKET mySocket;
struct sockaddr_in sa;
int err;
char cpAddr[20];
char sendBuf[100];


int main(){
	WSAStartup ( MAKEWORD(2,2), &wsd);
	printf ("输入目标IP (例如:192.168.0.1):\n");
	scanf ("%s", cpAddr);
	fflush (stdin);
	mySocket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
	sa.sin_family = AF_INET;
	sa.sin_addr.s_addr = inet_addr (cpAddr);
	sa.sin_port = htons (8080);
	err = connect (mySocket, (struct sockaddr *)&sa, sizeof(sa));
	if(err == SOCKET_ERROR)error("connet error!");
	printf ("connet succeed!\n");
	printf("Input:\n");
	fgets (sendBuf, 100, stdin);
	err = send  (mySocket, sendBuf, strlen(sendBuf), 0);
	if(err == SOCKET_ERROR)error("send failed!");
	printf ("send %d bytes.\n", err);
	getch();
	return 0;
}

网吧是192.168.0.1 GATEWAY
255.255.255.0 Subnet Mask
为什么我收到的连接都提示我是来自 192.168.255.255
有没有什么办法能区分呢? 怎么能从外面主动连接局域网内部的呢?就像TeamSpeaker一样.
就比如,我和我同学在不同的网吧,怎么能主动连接起来?

[嵌云阁主]

需要一台双方都能访问的公网计算机才行

[l999358]

我知道了,还要有个中间人......
关键不是IP,还有端口是吧.谢谢楼上给的思路啦.
结帖啦,哈哈哈哈.
知道了也没用，没地方找服务器,不可能自己开一个......

[hblinlin]

啊？？
不同局域网要ｐ２ｐ的，
不是简单ｃｓ／ｔｃｐ就可以搞定的。

ｃｓ模式ｓ最后在公网！

[l999358]

具体点好么......