int64 字节序转换

主机字节序与网络字节序之间的转换：

#ifndef WIN32

typedef long long __int64;

#endif

__int64 hton64(__int64 val ) 
{ 
long high, low;
low = (long)(val & 0x00000000FFFFFFFF);
val>>=32;
high = (long)(val & 0x00000000FFFFFFFF);
low = htonl( low );
high = htonl( high );


__int64 nRet = 0;
nRet = low;
nRet <<=32;
nRet |= high;


return nRet; 
} 


__int64 ntoh64(__int64 val )
{
long high, low;
low = (long)(val & 0x00000000FFFFFFFF);
val>>=32;
high = (long)(val & 0x00000000FFFFFFFF);
low = ntohl( low );
high = ntohl( high );


__int64 nRet = 0;
nRet = low;
nRet <<=32;
nRet |= high;


return nRet;
}