#include
    
     #include 
     
      #include 
      
       #include 
       
        #pragma comment(lib,"ws2_32.lib")#define PORT 9999#define IPADDR "127.0.0.1"#define BACKLOG 20#define FILENAME 200#define LENGTH 200#define BUFFERSIZE 1024struct FILEHEAD //FILE-head  struct{	char filename[LENGTH];//file name	unsigned int length;//the byte of the file};struct FILEDATA //FILE-data  struct{	char filename[LENGTH];//file name	char package[BUFFERSIZE];//package data	unsigned int length;//the byte of the file	unsigned int index;//index of the package};struct sockaddr_in clientaddr;  //Definition of the external variable for thread function callvoid getFileInformation(FILEHEAD file){	printf( "file information :\n" );	printf( "  Filename: %s\n", file.filename );	//printf( "  Ext: %s\n", file.ext );	printf( " the file length is: %ld btye\n", file.length );}void showClientinfo(){	//获取当前系统时间	SYSTEMTIME st;	GetLocalTime(&st);	char SysDate[30];	//将systime中的时间转变为字符串存入SysDate[30];	sprintf(SysDate, "%4d-%2d-%2d %2d:%2d:%2d", st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);	//Server显示客户端信息	printf("%s Recv from Client [%s:%d] : %s\n", SysDate, inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));	//服务器向客户端回显信息}DWORD WINAPI requestThread(LPVOID lparam){	FILEHEAD filehead;	FILEDATA filedata;	SOCKET newsock=(SOCKET)(LPVOID)lparam;	//char buf[BUFFERSIZE]={0};	memset(&filehead,0,sizeof(filehead));	memset(&filedata,0,sizeof(filedata));	showClientinfo();	//printf("等待文件头信息 ...\n");	int length_file_info=recv(newsock,(char *)&filehead,sizeof(filehead),0);	if (SOCKET_ERROR==length_file_info)	{		printf("receive failed!\n");		closesocket(newsock);		return -1;			}	if (length_file_info<=0)	{		exit(1);//异常退出	}	getFileInformation(filehead);//打印文件信息	FILE *fp=NULL;	fp=fopen(filehead.filename,"wb+");	if (NULL==fp)	{		perror("fail to build the file!!!\n");		exit(1);	}		//printf("要接收的文件名为：");	//printf(filehead.filename);//打印文件名		//printf ("\n catch file now....\n");		int recv_length=0;//接收到字节的长度		//Sleep(100);		printf("开始接收...\n");	filedata.index=0;	while (1)	{		recv_length=recv(newsock,(char *)&filedata,sizeof(filedata),0);		if (recv_length == SOCKET_ERROR)		{			printf("recv failed !\n");			closesocket(newsock);			//WSACleanup();			return -1;		}				fwrite(filedata.package,1,BUFFERSIZE,fp);		if (0==recv_length)		{			break;		}		//printf("第%d块接收成功!\n",filedata.index);	}	printf("\n接收完成...\n\n");		fflush(fp);	fclose(fp);	fp=NULL;		return 0;}int main(int argc,char *argv[]){	//初始化winsock版本信息，加载动态链接库(dll)	WSADATA wsData;	if (WSAStartup(MAKEWORD(2,2),&wsData)!=0)	{		printf("WSAStartup failed !!!\n");		return -1;	}		//创建套接字	SOCKET socklisten;	if((socklisten=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET)	{		printf("socket failed!!!\n");		WSACleanup();		return -1;	}		//设置服务器地址	struct sockaddr_in servaddr;		memset(&servaddr,0,sizeof(servaddr));	servaddr.sin_family=AF_INET;	servaddr.sin_port=htons(PORT);	servaddr.sin_addr.S_un.S_addr=inet_addr(IPADDR);		//绑定socket地址结构到监听套接字	if (bind(socklisten,(sockaddr *)&servaddr,sizeof(servaddr))!=0)	{		printf("binding failed!!!\n");		closesocket(socklisten);		WSACleanup();	}		//在server上运行监听	if (listen(socklisten,20)!=0)	{		printf("listen failed !!!\n");		closesocket(socklisten);		WSACleanup();		return -1;	}		//接收客户端的连接请求	printf("TCP server is start!!!\n");		//clientaddrlength要有初值，	int client_addr_length = sizeof(clientaddr);	memset(&clientaddr,0,client_addr_length);	SOCKET connect;		//循环等待	while (1)	{		if ((connect=accept(socklisten,(sockaddr *)&clientaddr,&client_addr_length))==INVALID_SOCKET)		{			printf("accept failed!!!\n");			closesocket(connect);			WSACleanup();			return -1;		}				//创建新线程		DWORD ThreadID;		CreateThread(NULL,0,requestThread,(LPVOID)connect,0,&ThreadID);	}		}