网络编程参数的传递

.....头文件和IP,ICMP的结构体略了
// 定义ICMP回应答复
typedef struct _ECHOREPLY
{
IPHDR ipHdr;
ECHOREQUEST echoRequest;
char cFiller[256];
}ECHOREPLY, *PECHOREPLY;

// 计算校验和
u_short checksum(u_short *buffer, int len)//略了
int SendEchoRequest(SOCKET s,struct sockaddr_in *lpstToAddr) //略了
DWORD RecvEchoReply(SOCKET s, LPSOCKADDR_IN lpsaFrom, u_char *pTTL)
// 等待回应答复，使用select机制
int WaitForEchoReply(SOCKET s)
{
struct timeval timeout;
fd_set readfds;

readfds.fd_count = 1;
readfds.fd_array[0] = s;
timeout.tv_sec = 5;
timeout.tv_usec = 0;

return(select(1, &readfds, NULL, NULL, &timeout));
}

// Ping功能实现
void Ping(char *pstrHost)
{
SOCKET rawSocket;
LPHOSTENT lpHost;
struct sockaddr_in destIP;
struct sockaddr_in srcIP;
DWORD dwTimeSent;
DWORD dwElapsed;
u_char cTTL;
int nLoop;