c programing (gcc with cygwin) math to see how many days old a file is
Posted on 2008-09-30
Inside in existing C program running in windows server 2003, I need to do math to find out if a file is the file more than X days old (e.g. more the 3 days old, more than 7 datys old, etc.). I am using the gcc compiler (ver. 3.4.4) that installs with cygwin. It apparently does not support __ing64. The filetime() function says
"It is not recommended that you add and subtract values from the FILETIME structure to obtain relative
times. Instead, you should copy the low- and high-order parts of the file time to a ULARGE_INTEGER
structure, perform 64-bit arithmetic on the QuadPart member, and copy the LowPart and HighPart
members into the FILETIME structure."
Is there an easier way to do this, or can someone point me to or provide examples doing the 64-bit math on the quadpart and reading the high and low parts back out?