TCP编程的问题

l999358 2008-05-06 12:33:34

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?

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