win32 tcp文件传输并发服务器

#include<stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <string.h>

#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 1024

struct 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 call

void 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);
}

}