How to retrieve total amount of system RAM?

[Wyverex]

Benji Smith wrote:
> Steven Schveighoffer wrote:
>> Getting system memory isn't part of any standard that I know of (at 
>> least on the posix side), and there's not a large demand for it.  The 
>> API for getting memory is decided on by OS implementors.  What you 
>> would end up with is a list of versions for not only different OSes, 
>> but different versions of the OS.  It's along the same lines as 
>> getting/setting network interface addresses.
>>
>> From experience (I have written a program to get system memory size), 
>> it is not trivial.  And not always accurate.
>>
>> This is not to say that it couldn't be added.  If you come up with 
>> something that looks reasonable, Tango might accept it.
>>
>> -Steve 
> 
> 
> In win32, it looks like the GlobalMemoryStatus (for all non-NT versions) 
> and GlobalMemoryStatusEx (for all NT-based versions), from kernel32.dll, 
> would do the trick.
> 
> http://msdn.microsoft.com/en-us/library/aa366586.aspx
> http://msdn.microsoft.com/en-us/library/aa366589(VS.85).aspx
> 
> In linux, a bare-minimum solution would be to read from /proc/meminfo, 
> even if there's no POSIX function.
> 
> Of course, I'm talking out of my ass here, because my experience with 
> C/C++ programming is very thin. I don't know, for example, how you'd 
> check for the existence of the GlobalMemoryStatusEx function and fall 
> back to GlobalMemoryStatus when it doesn't exist.
> 
> It seems doable, though my own systems programming experience is 
> probably too lacking for me to make it happen myself.
> 
> --benji

Id default to NT version since its Win 2000+,
Then force version flag for non-NT,  or dont support 95, 98, ME

version(WIN_NO_NT)
   alias GlobalMemoryStatus GlobalMemoryStat;
else
   alias GlobalMemoryStatusEx GlobalMemoryStat;