TCP编程的问题

2008-05-06 12:33:34 92 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

tcp中非阻塞编程为啥出现粘包问题及netty如何解决在网络编程中我们调用send方法只是将数据存放到sendbuf中由底层tcp进行发送包，这里发送包底层会进行一些优化，尽可能一次发送多的数据，但是数据大小不能太大如果太大会拆分多次进行发送。所有在这个过程中就会出现一次发送包含大量数据包或者一次无法发送完整的数据包。这就是我们说的粘包问题。在阻塞编程中我们获取连接管道后不停去读取数据判断是否满足指定标记来结束一个包，而非阻塞编程中由于select模... 阅读详情

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?

...全文