2个DWORD类型转换成INT64

INT64 CombineToINT64(DWORD dwHight, DWORD dwLow)
{
    INT64 nValue, nTmp = 0;

 nTmp = dwHight;
 nValue = (nTmp << 32);
 nTmp = dwLow;

 
 nValue += nTmp;

 return nValue;
}