C语言编写的仿QQ局域网通讯程序

// 系统添加网络连接的头文件引用及一些消息类型的宏定义：

#include

#include

#pragma comment(lib,"ws2_32.lib")

#define CLIENTSEND_EXIT 1

#define CLIENTSEND_TRAN 2

#define CLIENTSEND_LIST 3

#define SERVERSEND_SELFID 1

#define SERVERSEND_NEWUSR 2

#define SERVERSEND_SHOWMSG 3

#define SERVERSEND_ONLINE 4

FILE *ioutfileServer;

FILE *ioutfileClient;

struct CReceivePackage

{

int iType;

int iToID;

int IFromID;

char cBuffer[1024];

};

struct CSendPackage

{

int iType;

int iCurConn;

char cBuffer[1024];

};

struct CUserSocketInfo

{

int ID;

char cDstIP[64];

int iPort;

SOCKET sUserSocket;

};

struct CUser

{

int ID;

char cDstIP[64];

};

struct CUser usr[20];

int bSend=0;

int iMyself;

int iNew=0;

struct CUserSocketInfo usrinfo[20];

//退出函数

void ExitSystem()

{

if(ioutfileServer!=NULL)

fclose(ioutfileServer);

if(ioutfileClient!=NULL)

fclose(ioutfileClient);

WSACleanup();

exit(0);

}

//服务器端接收消息的线程

DWORD WINAPI threadproServer(LPVOID pParam)

{

SOCKET hsock=(SOCKET)pParam;

char cRecvBuffer[1024];

char cShowBuffer[1024];

int num=0;

if(hsock!=INVALID_SOCKET)

printf("start:\n");

while(1)

{

num=recv(hsock,cRecvBuffer,1024,0);

if(num>=0)

{

cRecvBuffer[num]='\0';

sprintf(cShowBuffer,"to me:%s\n",cRecvBuffer);

printf("%s",cShowBuffer);

fwrite(cShowBuffer,sizeof(char),strlen(cShowBuffer),ioutfileServer); fflush(ioutfileServer);

if(strcmp("exit",cRecvBuffer)==0)

{

ExitSystem();

}

}

}

return 0;

}

//检查IP

int CheckIP(char *cIP)

{

char IPAddress[128];

char IPNumber[4];

int iSubIP=0;

int iDot=0;

int iResult=0;

int iIPResult=1;

int i;

memset(IPNumber,0,4);

strncpy(IPAddress,cIP,128);

for(i=0;i<128;i++)

{

if(IPAddress[i]=='.')

{

iDot++;

iSubIP=0;

if(atoi(IPNumber)>255)

iIPResult=0;

memset(IPNumber,0,4);

}

else

{

IPNumber[iSubIP++]=IPAddress[i]; }

if(iDot==3 && iIPResult!=0)

iResult=1;

}

return iResult;

}

//创建点对点服务端

void CreateServer()

{

SOCKET m_SockServer;

struct sockaddr_in serveraddr;

struct sockaddr_in serveraddrfrom;

int iPort=4600;

int iBindResult=-1;

int iWhileCount=200;

struct hostent* localHost;

char* localIP;

SOCKET m_Server;

char cWelcomBuffer[]="Welcome to you";

int len=sizeof(struct sockaddr);

int iWhileListenCount=10;

DWORD nThreadId=0;

int ires;

char cSendBuffer[1024];

char cShowBuffer[1024];

ioutfileServer=fopen("MessageServer.txt","a");

m_SockServer=socket(AF_INET,SOCK_STREAM, 0);

printf("本机绑定的端口号（大于1024）:");

scanf("%d",&iPort);

localHost=gethostbyname("");

localIP=inet_ntoa(*(struct in_addr *)*localHost->h_addr_list);

serveraddr.sin_family=AF_INET;

serveraddr.sin_port=htons(iPort);

serveraddr.sin_addr.S_un.S_addr=inet_addr(localIP);

iBindResult=bind(m_SockServer,(struct sockaddr*)&serveraddr,sizeof(struct sockaddr));

while(iBindResult!=0 && iWhileCount>0)

{

printf("绑定失败，重新输入：");

scanf("%d",iPort);

serveraddr.sin_family=AF_INET;

serveraddr.sin_port=htons(iPort);

serveraddr.sin_addr.S_un.S_addr=inet_addr(localIP);

iBindResult=bind(m_SockServer,(struct sockaddr*)&serveraddr,sizeof(struct