网络编程实验指导书

网络编程实验指导书执笔：王新祥教研室：计算机网络网络编程上机操作实验是本课程必不可少的实践环节。

上机实验的目的是使学生熟悉网络编程的全过程，加深对网络编程方法的理解，得到程序设计基本方法和技巧的训练，从而能真正掌握网络通信程序的设计方法，以解决网络通信的实际问题。

实验一 获取计算机的网卡地址（2学时）一、实验目的1、掌握使用NetBIOS得到MAC地址的方法。

2、掌握通过发送ARP来获取网络中计算机MAC地址的方法。

二、实验内容与步骤(一) 实验内容1、使用NetBIOS得到本机的MAC地址；2、使用ARP获取网络中计算机的MAC地址。

(二) 实验步骤1、利用NetBIOS得到MAC地址首先发送NCBENUM命令，获取网卡的数目和每张网卡的内部编号，然后对每个网卡标号发送NCBASTAT命令获取其MAC地址。

注意：这里的网卡是指捆绑了NetBEUI协议的通信协议栈，可以在网卡的属性处查看到。

(1) 在VC++ 6.0中创建空的控制台应用程序工程；(2) 新建一个源文件，并注意将此源文件添加到创建的工程中，然后输入如下代码：(3) 编译、链接并执行文件，分析程序输出的结果。

2、通过发送ARP来获取网卡的MAC地址在Windows 2000及以上系统中也可以通过发送ARP来获取网络中计算机的MAC地址，当然也包括自己的计算机。

函数SendARP的原型如下：DWORD WINAPI SendARP (IPAddr DestIP,IPAddr SrcIP,PULONG pMacAddr,PULONG PhyAddrLen );其中pMacAddr参数返回一个ULONG变量数组的指针。

该数组的前6个字节包括了DespIP对应的物理地址。

(1) 在VC++ 6.0中创建空的控制台应用程序工具；(2) 新建一个源文件并将其添加到工程中，然后输入如下代码：(3) 注意：要将“218.196.13.163”这个IP地址替换成自己所使用机器的IP地址。

(4) 将“实验一的支撑文件”目录下的所有文件拷贝到工程所在的目录；(5) 编译、链接并执行程序，注意分析程序的输出结果。

(三) 注意事项实验内容1的程序目录下要添加四个文件，即“IPExport.h”、“IPHlpApi.h”、“IPHlpApi.Lib”及“IPTypes.h”。

并在工程设置对话框的“Link”选项卡中的“Object/libray Modules：”编辑框内的最后面添加“ws2_32.lib IPHlpApi.Lib”内容，以便对这两个库文件的引用。

或者在源文件的头部添加如下两行代码：#pragma comment (lib, "ws2_32.lib")#pragma comment (lib, "IPHlpApi.Lib")三、实验要求程序能正常运行，能得到准确的结果。

实验二 简易聊天室（4学时）一、实验目的1、熟悉VC++编程环境；2、熟悉使用VC++设计程序的过程；3、熟练掌握NetBIOS编程的基本思路和方法。

二、实验原理NetBIOS网络编程的核心是通过这个标准接口，以基于统一的命令集的网络控制块NCB作为参数的“Netbios(PNCB pncb)”函数调用，使用VC++ 6.0实现具有聊天功能的局域网内控制台应用程序。

使用Netbios函数的关键是对NCB结构的理解，该结构体的定义如下：typedef struct _NCB {UCHAR ncb_command;UCHAR ncb_retcode;UCHAR ncb_lsn;UCHAR ncb_num;PUCHAR ncb_buffer;WORD ncb_length;UCHAR ncb_callname[NCBNAMSZ];UCHAR ncb_name[NCBNAMSZ];UCHAR ncb_rto;UCHAR ncb_sto;void (*ncb_post) (struct _NCB *);UCHAR ncb_lana_num;UCHAR ncb_cmd_cplt;UCHAR ncb_reserve[10];HANDLE ncb_event;} NCB;三、实验内容与步骤(一) 实验内容使用Netbios函数实现聊天室功能。

(二) 实验步骤1、在Visual C++中创建头文件“NetBIOS.h”，并输入如下代码：#include <windows.h>#include <stdio.h>#pragma comment(lib,"netapi32.lib")#define MAXSESSIONS 254#define MAXNAMES 254#define NBCheck(x) if (NRC_GOODRET != x.ncb_retcode) { \ printf("Line %d: Got 0x%x from NetBios()\n", \__LINE__, x.ncb_retcode); \}#define PNBCheck(x) if (NRC_GOODRET != x->ncb_retcode) { \ printf("Line %d: Got 0x%x from NetBios()\n", \__LINE__, x->ncb_retcode); \}#define Online 1 // A user is on line#define Offline 2 // A user is off line#define Listen 3 // A user is waiting for connection#define Message 4 // A user is on linetypedef struct DataGram{ // the format of a datagramUCHAR flag; // the type of messagechar message[256]; //the content of message} DataGram, *PDataGram;char LocalName[NCBNAMSZ]; //local namechar GroupName[NCBNAMSZ]; //group nameUCHAR NameNum;UCHAR GroupNameNum;#define DGLEN sizeof(struct DataGram)void MakeNetbiosName(char *achDest, char *szSrc){int cchSrc;cchSrc =strlen(szSrc);if (cchSrc > NCBNAMSZ) cchSrc = NCBNAMSZ;memset(achDest, ' ', NCBNAMSZ);memcpy(achDest, szSrc, cchSrc);if (cchSrc!=NCBNAMSZ) achDest[cchSrc]='\0';}UCHAR LanaEnum(LANA_ENUM *lenum){NCB ncb;UCHAR uRetCode;memset( &ncb, 0, sizeof(NCB) );ncb.ncb_command = NCBENUM;ncb.ncb_buffer = (UCHAR *)lenum;ncb.ncb_length = sizeof(LANA_ENUM);uRetCode = Netbios( &ncb );NBCheck(ncb)return uRetCode;}UCHAR RestNCB(UCHAR jiangxue_lana){NCB jiangxue_ncb;memset(&jiangxue_ncb,0,sizeof(NCB));jiangxue_ncb.ncb_command=NCBRESET;jiangxue_ncb.ncb_callname[0]=MAXSESSIONS;jiangxue_ncb.ncb_callname[2]=MAXNAMES;jiangxue_ncb.ncb_lana_num=jiangxue_lana;Netbios(&jiangxue_ncb);NBCheck(jiangxue_ncb)return (jiangxue_ncb.ncb_cmd_cplt);}UCHAR Astatus(UCHAR jiangxue_lana, PVOID pBuffer, int cbBuffer,char *szName) {NCB jiangxue_ncb;ZeroMemory(&jiangxue_ncb,sizeof(NCB));jiangxue_ncb.ncb_command=NCBASTAT;jiangxue_ncb.ncb_lana_num=jiangxue_lana;jiangxue_ncb.ncb_buffer=(PUCHAR)pBuffer;jiangxue_ncb.ncb_length=cbBuffer;strcpy((char *)jiangxue_ncb.ncb_callname,szName);Netbios(&jiangxue_ncb);NBCheck(jiangxue_ncb)return(NRC_GOODRET==jiangxue_ncb.ncb_retcode);}BOOL Adapterlist(UCHAR nlana, char *szName){ //get the state of each adapter with some protocol.int cbBuffer;ADAPTER_STATUS *pStatus;NAME_BUFFER *pNames;int i;HANDLE hHeap;char cname[16];hHeap=GetProcessHeap();//allocate the largest buffer that might be needed.cbBuffer=sizeof(ADAPTER_STATUS)+255*sizeof(NAME_BUFFER);pStatus=(ADAPTER_STATUS *)HeapAlloc(hHeap,0, cbBuffer);if (NULL==pStatus) return FALSE;if(!Astatus(nlana,(PVOID)pStatus,cbBuffer,szName)){HeapFree(hHeap, 0, pStatus);return FALSE;}//list the adapter status structure and namesif(pStatus->adapter_type==0xFE)strcpy(cname,"Ethernet");else strcpy(cname,"The other type");printf("The %s Number on LANA %d with version %d.%d is: %02x%02x%02x%02x%02x%02x\n",cname, nlana,pStatus->rev_major,pStatus->rev_minor,pStatus->adapter_address[0],pStatus->adapter_address[1],pStatus->adapter_address[2],pStatus->adapter_address[3],pStatus->adapter_address[4],pStatus->adapter_address[5] );printf("The number of names in the local names table is %d\n",pStatus->name_count);pNames=(NAME_BUFFER *)(pStatus+1);for (i=0;i<pStatus->name_count;i++)printf("\t%.*s\n",NCBNAMSZ,pNames[i].name);HeapFree(hHeap,0,pStatus);return TRUE;}UCHAR AddName(char * kemin_LocalName, UCHAR kemin_lana, UCHAR *kemin_LocalNameNum) {NCB kemin_ncb;memset(&kemin_ncb,0,sizeof(NCB));kemin_ncb.ncb_command=NCBADDNAME;kemin_ncb.ncb_lana_num=kemin_lana;strcpy((char *)kemin_ncb.ncb_name,kemin_LocalName);Netbios(&kemin_ncb);NBCheck(kemin_ncb)*kemin_LocalNameNum=kemin_ncb.ncb_num;return(kemin_ncb.ncb_cmd_cplt);}UCHAR AddGroupName(char * limin_GroupName, UCHAR limin_lana, UCHAR *limin_GroupNameNum) {NCB limin_ncb;memset(&limin_ncb,0,sizeof(NCB));limin_ncb.ncb_command=NCBADDGRNAME;limin_ncb.ncb_lana_num=limin_lana;strcpy((char *)limin_ncb.ncb_name,limin_GroupName);Netbios(&limin_ncb);NBCheck(limin_ncb)*limin_GroupNameNum=limin_ncb.ncb_num;return(limin_ncb.ncb_cmd_cplt);}UCHAR DeleteName(char *liufei_LocalName, UCHAR liufei_lana){NCB liufei_ncb;memset(&liufei_ncb,0,sizeof(NCB));liufei_ncb.ncb_command=NCBDELNAME;liufei_ncb.ncb_lana_num=liufei_lana;strcpy((char *)liufei_ncb.ncb_name,liufei_LocalName);Netbios(&liufei_ncb);NBCheck(liufei_ncb)return(liufei_ncb.ncb_cmd_cplt);}UCHAR NetbiosListen(int lana, PNCB pncb, char *SourName){memset(pncb,0,sizeof(NCB));pncb->ncb_command=NCBLISTEN; //synchronous callstrcpy((char *)pncb->ncb_name,SourName);strcpy((char *)pncb->ncb_callname,"*");pncb->ncb_lana_num=lana;return Netbios(pncb);}UCHAR NetbiosCall(PNCB yixiong_pncb,UCHAR lana,char *yixiong_SourName, char *yixiong_DestName) {memset(yixiong_pncb,0,sizeof(NCB));yixiong_pncb->ncb_command=NCBCALL;yixiong_pncb->ncb_lana_num=lana;strcpy((char *)yixiong_pncb->ncb_name, yixiong_SourName);strcpy((char *)yixiong_pncb->ncb_callname, yixiong_DestName);return Netbios(yixiong_pncb);}UCHAR SessionSend(UCHAR lana, UCHAR zhangke_SessionNum, char *pBuffer, WORD Length){NCB zhangke_ncb;memset(&zhangke_ncb,0,sizeof(NCB));zhangke_ncb.ncb_command=NCBSEND;zhangke_ncb.ncb_lsn=zhangke_SessionNum;zhangke_ncb.ncb_buffer=(UCHAR *)pBuffer;zhangke_ncb.ncb_length=Length;return Netbios(&zhangke_ncb);}UCHAR SessionRecv(UCHAR lana, UCHAR guojun_SessionNum, char *pBuffer){NCB guojun_ncb;memset(&guojun_ncb,0,sizeof(NCB));guojun_ncb.ncb_command=NCBRECV;guojun_ncb.ncb_lsn=guojun_SessionNum;guojun_ncb.ncb_buffer=(UCHAR *)pBuffer;guojun_ncb.ncb_length=512;return Netbios(&guojun_ncb);}UCHAR HangupSession(UCHAR wanglinjia_SessionNum){NCB wanglinjia_ncb;UCHAR ucRc;memset(&wanglinjia_ncb,0,sizeof(NCB));wanglinjia_ncb.ncb_command=NCBHANGUP;wanglinjia_ncb.ncb_lsn=wanglinjia_SessionNum;ucRc=Netbios(&wanglinjia_ncb);return(ucRc);}UCHAR SDGSend(UCHAR lana,char *wugang_DestName, UCHAR wugang_LocalNameNum,char *pBuffer, WORD Length){NCB wugang_ncb;UCHAR ucRc;memset(&wugang_ncb,0,sizeof(NCB));wugang_ncb.ncb_command=NCBDGSEND;strcpy((char *)wugang_ncb.ncb_callname, wugang_DestName);wugang_ncb.ncb_num=wugang_LocalNameNum;wugang_ncb.ncb_buffer=(UCHAR *)pBuffer;wugang_ncb.ncb_length=Length;ucRc=Netbios(&wugang_ncb);NBCheck(wugang_ncb)return(ucRc);}UCHAR ADGSend(UCHAR lana,char *DestName, UCHAR LocalNameNum, HANDLE hEvent,char *pBuffer, WORD Length){NCB ncb;memset(&ncb,0,sizeof(NCB));ncb.ncb_command=NCBDGSEND|ASYNCH;ncb.ncb_lana_num=lana;strcpy((char *)ncb.ncb_callname, DestName);ncb.ncb_num=LocalNameNum;ncb.ncb_buffer=(UCHAR *)pBuffer;ncb.ncb_length=Length;ncb.ncb_cmd_cplt=0xff;ncb.ncb_event=hEvent;Netbios(&ncb);return ncb.ncb_cmd_cplt;}UCHAR SDGRecv(UCHAR lana,UCHAR wangyan_Num,char *DestName, char *pBuffer, WORD *len) {NCB wangyan_ncb;memset(&wangyan_ncb,0,sizeof(NCB));wangyan_ncb.ncb_command=NCBDGRECV;wangyan_ncb.ncb_lana_num=lana;wangyan_ncb.ncb_num=wangyan_Num;wangyan_ncb.ncb_buffer=(UCHAR *)pBuffer;wangyan_ncb.ncb_length=*len;Netbios(&wangyan_ncb);NBCheck(wangyan_ncb)strcpy(DestName,(char *)wangyan_ncb.ncb_callname);return wangyan_ncb.ncb_cmd_cplt;}UCHAR DatagramSendBC(UCHAR lana, UCHAR num,char * buf, WORD len){ //send the broadcasting datagram from the given name-based numberNCB ncb;ZeroMemory(&ncb,sizeof(NCB));ncb.ncb_command=NCBDGSENDBC;ncb.ncb_lana_num=lana;ncb.ncb_num=num;ncb.ncb_buffer=(PUCHAR)buf;ncb.ncb_length=len;Netbios(&ncb);NBCheck(ncb)return ncb.ncb_retcode;}UCHAR DatagramRecvBC(UCHAR lana, UCHAR num,char *buf, WORD *len, char *Callname){ //receive the broadcasting datagram from the given name-based numberNCB ncb;ZeroMemory(&ncb,sizeof(NCB));ncb.ncb_command=NCBDGRECVBC;ncb.ncb_lana_num=lana;ncb.ncb_num=num;ncb.ncb_buffer=(PUCHAR)buf;ncb.ncb_length=*len;Netbios(&ncb);NBCheck(ncb)*len=ncb.ncb_length;strcpy(Callname,(char *)ncb.ncb_callname);return ncb.ncb_retcode;}int CommandTranslating(const char *Command) //return the different value for the different command {if(strcmp(Command,"lookup")==0) return 1; //look up the status of the locall adapterif(strcmp(Command,"session")==0) return 2; //session communicationif(strcmp(Command,"sendtoname")==0) return 3; //unicast or multicast communicationif(strcmp(Command,"sendtoall")==0) return 4; //broadcast communicationif(strcmp(Command,"exit")==0) return 5; // quitreturn 0;}2、在VC++中创建源文件“NetChat.cpp”，并输入如下代码：#include "NetBIOS.h"UCHAR Elana[10];UCHAR Elength = 0;LANA_ENUM lenum;DWORD WINAPI SessionReceiveThread(LPVOID param) //the thread to receive the data for the session {PNCB pncb = (PNCB)param;buffer[512];charSessionNum;UCHARretcode;UCHARDestName[NCBNAMSZ];charSessionNum = pncb->ncb_lsn;memset(DestName, '\0', NCBNAMSZ);(char *)pncb->ncb_callname);strcpy(DestName,for(;;){memset(buffer, '\0', 512);retcode = SessionRecv(Elana[0], SessionNum, buffer);if(retcode == 0){toyou(on session):", DestName);saysprintf("\n%sputs(buffer);message to send to %s:", DestName);inputprintf("pleasecontinue;}else{connection to you!\n", DestName);theprintf("\n%sleavesHangupSession(SessionNum);break;}}return1;}void ServerSession(PNCB pncb){hSThread;HANDLEdwSExitCode;DWORDDWORDid;sbuffer[512];charretcode;UCHARSessionNum;UCHARDestName[NCBNAMSZ];charSessionNum = pncb->ncb_lsn;memset(DestName, '\0', NCBNAMSZ);strcpy(DestName,(char *)pncb->ncb_callname);hSThread = CreateThread(NULL, 0, SessionReceiveThread, (PVOID)pncb, 0, &id);//create a thread to receive the messagedwSExitCode = 0;retcode = 0;printf("%s has accepted the connection to %s!\n", LocalName, DestName);Sleep(1000);memset(sbuffer, '\0', 512);strcpy(sbuffer, "Welcome to Server!");SessionSend(Elana[0], SessionNum, sbuffer, sizeof(sbuffer));printf("When you send a message to the other party, \n");means stopping to send!\n\n");\"exit\"messageprintf("thefor(;;){printf("please input message to send to %s:", DestName);memset(sbuffer, '\0', 512);gets(sbuffer);if(strcmp(sbuffer, "exit") == 0){dwSExitCode);TerminateThread(hSThread,CloseHandle(hSThread);HangupSession(SessionNum);break;}retcode = SessionSend(Elana[0], SessionNum, sbuffer, sizeof(sbuffer));if(retcode != 0) break;}}void ClientSession(PNCB pncb){hCThread;HANDLEdwCExitCode;DWORDid;DWORDcbuffer[512];charretcode;UCHARUCHARSessionNum;char DestName[NCBNAMSZ];SessionNum = pncb->ncb_lsn;memset(DestName, '\0', NCBNAMSZ);(char *)pncb->ncb_callname);strcpy(DestName,hCThread = CreateThread(NULL, 0, SessionReceiveThread, (PVOID)pncb, 0, &id); //create a thread to receive the messagedwCExitCode = 0;retcode = 0;printf("%s has connected to the server %s!\n", LocalName, DestName);printf("When you send a message to the other party, \n");printf("the message \"exit\" means stopping to send!\n");Sleep(1000);for(;;){memset(cbuffer, '\0', 512);gets(cbuffer);if(strcmp(cbuffer, "exit") == 0){dwCExitCode);TerminateThread(hCThread,CloseHandle(hCThread);HangupSession(SessionNum);break;}retcode = SessionSend(Elana[0], SessionNum, cbuffer, sizeof(cbuffer));if(retcode != 0) break;printf("please input message to send to %s:", DestName);}}DWORD WINAPI GDGRecvTread(LPVOID param)//receive the message from the group{WORD len = DGLEN;Gbuffer[DGLEN];char=(PDataGram)Gbuffer;pdataPDataGramGCallName[NCBNAMSZ];charwhile(1){memset(GCallName, '\0', NCBNAMSZ);if(SDGRecv(Elana[0], GroupNameNum, GCallName, Gbuffer, &len) == NRC_GOODRET) {0)==LocalName)if(strcmp(GCallName,sendout!\n");hasmulticastingmessageprintf("Theelse{printf("\nMulticasting sender's name: %s\n", GCallName);printf("the content of message: %s\n", pdata->message);printf("$");}}}1;return}DWORD WINAPI SDGRecvTread(LPVOID param) //receive the message from Single user{ //receive the information from the given name number,//if the name number is set to 0xff, then receive all the local dataWORD len1 = DGLEN;charbuffer1[DGLEN];(PDataGram)buffer1;=PDataGrampdata1CallName1[NCBNAMSZ];charwhile(1){memset(CallName1, '\0', NCBNAMSZ);if(SDGRecv(Elana[0], NameNum, CallName1, buffer1, &len1) == NRC_GOODRET){Message)if(pdata1->flag=={printf("\nUnicasting sender's name: %s\n", CallName1);printf("the content of message: %s\n", pdata1->message);printf("$");}if(pdata1->flag == Online){printf("\nThe user %s is on line and has the group name %s!\n$",CallName1, pdata1->message);}}}return 1;}void DGsendCMD(UCHAR lana, UCHAR NameNum, char * DestName){char buff[256];char buffer[DGLEN];WORD len = DGLEN;PDataGram pdata = (PDataGram)buffer;printf("please input message to send to the name %s:", DestName);memset(buff, '\0', 256);gets(buff);pdata->flag = Message;strcpy(pdata->message, buff);SDGSend(lana, DestName, NameNum, (char *)pdata, len);}DWORD WINAPI DGRecvBCTread(LPVOID param) //receive the broadcasting message from single user{ //receive the information from the given name number,WORD len;char buffer[DGLEN];char buff[DGLEN];PDataGram pdata1 = (PDataGram)buffer;PDataGram pdata2 = (PDataGram)buff;char DestName[NCBNAMSZ];while(1){len = DGLEN;memset(DestName, '\0', NCBNAMSZ);if(DatagramRecvBC(Elana[0], NameNum, buffer, &len, DestName) != NRC_GOODRET)continue;switch(pdata1->flag){case Message: // Ordinary messageif(strcmp(DestName, LocalName) == 0){printf("Broadcasting message has sent out!\n");break;}printf("\nThe user %s broadcasts the message:%s\n$", DestName, pdata1->message);break;case Online: // a user comes on lineif(strcmp(DestName, LocalName) == 0) break;printf("\nThe user %s goes on line and has the group name %s!\n$",pdata1->message);DestName,Sleep(1000);=DGLEN;lenOnline;=pdata2->flag256);memset(pdata2->message,'\0',GroupName);strcpy(pdata2->message,NameNum, (char *)pdata2, len);SDGSend(Elana[0],DestName,break;case Offline: //a user gets off lineif(strcmp(DestName, LocalName) == 0) break;printf("\nThe user %s has been off line!\n$", DestName);break;case Listen: //a user is waiting for a connectionif(strcmp(DestName, LocalName) == 0){printf("Listening message has sent out!\n");break;}printf("\nThe server %s is waiting for a client to connect!\n$", DestName);break;}}1;return}void DGsendBCCMD(UCHAR lana, UCHAR NameNum){buff[256];charbuffer[DGLEN];charWORD len = DGLEN;=(PDataGram)buffer;pdataPDataGramprintf("please input message to broadcast:");memset(buff, '\0', 256);gets(buff);Message;=pdata->flagmemset(pdata->message, '\0', 256);buff);strcpy(pdata->message,NameNum, (char *)pdata, len);DatagramSendBC(lana,}int main(void){DWORD dwExitCode1, dwExitCode2, dwExitCode3;DWORDid;HANDLE hThread1, hThread2, hThread3;command[64];charUCHAR uRetCode = 0;i;intsKey[64];chardwExitCode1 = 0;dwExitCode2 = 0;dwExitCode3 = 0;//learn The information of the adapter resource!uRetCode = LanaEnum(&lenum);if (uRetCode != NRC_GOODRET) return -1;normal!\n");printf("Adapterisfor (i = 0; i<lenum.length;i++){ //reset the each adapter with protocol.uRetCode = RestNCB(na[i]);if (uRetCode == NRC_GOODRET){na[i];=Elana[Elength]Elength++;}};if (Elength == 0){printf("NCB reseting fails\n");getchar();-1;return}printf("The length of lenum is %d \n", Elength);printf("NCB reseting is OK\n");printf("Enter the local name:");sKey);scanf("%s",sKey);MakeNetbiosName(LocalName,fflush(stdin);printf("Enter the group name:");scanf("%s",sKey);sKey);MakeNetbiosName(GroupName,fflush(stdin);if (AddName(LocalName, Elana[0], &NameNum) != NRC_GOODRET){printf("Name adding is going wrong!\n");getchar();return-1;}printf("Name adding is OK!\n");if (AddGroupName(GroupName, Elana[0], &GroupNameNum) != NRC_GOODRET) {adding is going wrong!\n");Nameprintf("Groupgetchar();-1;return}printf("Group Name adding is OK!\n");hThread1 = CreateThread(NULL, 0, DGRecvBCTread, NULL, 0, &id);// create a thread to receive the broadcast messageshThread2 = CreateThread(NULL, 0, GDGRecvTread, NULL, 0, &id);// create a thread to receive the multicast messageshThread3 = CreateThread(NULL, 0, SDGRecvTread, NULL, 0, &id);// create a thread to receive the unicast messagesSleep(3000);system("cls");printf("The locall name: %s and the group name: %s\n", LocalName, GroupName); printf("*******************************************************\n");prompt:$\n"printf( "\t\tcommand" lookup: learn the information about the adapter\n"" session: setup the session communication \n""sendtoname: send a datagram to the given name\n"" sendtoall: send a datagram to all the users on LAN\n"" exit: quit\n");printf("*******************************************************\n");WORD len = DGLEN;data;DataGram(PDataGram)&data;=PDataGrampdataCallName[NCBNAMSZ];charNCBncb;memset(&ncb, 0, sizeof(NCB));PNCB pncb = &ncb;Online;=pdata->flagGroupName);strcpy(pdata->message,DatagramSendBC(Elana[0],NameNum, (char *)pdata, len);while(1){printf("$");command);scanf("%s",fflush(stdin);switch(CommandTranslating(command)){case 1: //learn the information about the adapterprintf("If you type \"l\", it means localname otherwise the adapter\n");choice:");yourenterprintf("PleasesKey);scanf("%s",fflush(stdin);if (strcmp(sKey, "l") == 0)LocalName);Adapterlist(Elana[0],elseAdapterlist(Elana[i],"*");0;i<Elength;i++)for(i=Sleep(999);break;case 2: //setup the session communication* (to listen as a server) \n");charactertheprintf("Enterprintf("or the server's name( to connect as a client ):");scanf("%s", sKey);MakeNetbiosName(CallName, sKey);fflush(stdin);if(strcmp(CallName, "*") == 0){pdata->flag = Listen;memset(pdata->message, '\0', 256);strcpy(pdata->message, "**");DatagramSendBC(Elana[0], NameNum, (char *)pdata, len);while(1){NetbiosListen(Elana[0], pncb, LocalName);ServerSession(pncb);printf("If you need listen to the next, please type the letter \"y\":");scanf("%s", sKey);if(strcmp(sKey, "y") != 0) break;}}else{uRetCode = NetbiosCall(pncb, Elana[0], LocalName, CallName);if (uRetCode == 0) ClientSession(pncb);else printf("The server %s isn't listenning!\n", CallName);}Sleep(3000);break;case 3: //send a datagram to the given nameprintf("Enter the receiver's or group's name:");scanf("%s", sKey);MakeNetbiosName(CallName, sKey);fflush(stdin);DGsendCMD(Elana[0], NameNum, CallName);Sleep(999);break;case 4: //send a datagram to all the users on LANDGsendBCCMD(Elana[0], NameNum);Sleep(999);break;case 5: //quitTerminateThread(hThread1, dwExitCode1);TerminateThread(hThread2, dwExitCode2);TerminateThread(hThread3, dwExitCode3);pdata->flag = Offline;strcpy(pdata->message, GroupName);DatagramSendBC(Elana[0], NameNum, (char *)pdata, len);CloseHandle(hThread1);CloseHandle(hThread2);CloseHandle(hThread3);DeleteName(GroupName, Elana[0]);Elana[0]);DeleteName(LocalName,1;returndefault:printf("You type a wrong command!\n");Sleep(999);break;}}getchar();0;return}3、在系统托盘中双击本地连接，在弹出的“本地连接状态”对话框中单击“属性”按钮，在弹出的“本地连接属性”对话框中选择“常规”选项卡，在“此连接使用下列项目”列表框中选择“Internet 协议 (TCP/IP)”，然后点击“属性”按钮，在弹出的“Internet 协议 (TCP/IP) 属性”对话框中单击“高级”按钮，在弹出的“高级 TCP/IP 设置”对话框中选定“WINS”选项卡，选择“启用 TCP/IP 上的 NetBIOS”，然后单击“确定”按钮两次，最后单击“关闭”按钮，完成启用NetBIOS的设置。