use c++ http post file

/*------------------------------------------------------------------------------------------------------------------- 
函数功能：发送HTTP头 
参    数：sockfd 服务器句柄； 
      head HTTP头 
返回值：  成功返回0，失败返回错误代码 
--------------------------------------------------------------------------------------------------------------------*/ 
int SendHttpHead(int sockfd, HTTPHEAD head) 
{ 
char data[100]; 
char dataEnc[100]; 

char httphead[500] = "POST "; 
strcat(httphead, head.servicename); 
strcat(httphead, " HTTP/1.0\n"); 

strcat(httphead, "Connection: keep-alive\n"); 

strcat(httphead, "Content-Type: text/html; charset=\"gb2312\"\n"); 

strcat(httphead, "Content-Length: "); 
strcat(httphead, head.ContentLength); 
strcat(httphead, "\n"); 

strcat(httphead, "Host: "); 
strcat(httphead, head.HostIP); 
strcat(httphead, ":"); 
strcat(httphead, head.HostPort); 
strcat(httphead, "\n"); 

strcat(httphead, "Accept: text/html, */*\n"); 

strcat(httphead, "User-Agent: Mozilla/3.0 (compatible; Indy Library)\n"); 

strcat(httphead, "Authorization: Basic "); 
strcpy(data, head.TaxPayerNO); 
strcat(data, ":"); 
strcat(data, "888888\n"); 
Base64_Enc(dataEnc, data, strlen(data)); 
strcat(httphead, dataEnc); 

strcat(httphead, "proxy-Authorization: Basic Og==\n"); 

if ( send(sockfd, httphead, strlen(httphead) ,0) == -1 )  
{ 
return -1; 
} 
return 0; 

}