Delphi 2007:GlobalMemoryStatus获取总RAM [英] Delphi 2007: GlobalMemoryStatus to get total RAM

问题描述

我需要使用Delphi 2007获取系统的总物理内存.在具有4GB或更大容量的系统上使用GlobalMemoryStatus似乎会给我带来错误.在Delphi 2007中，GlobalMemoryStatusEx不存在，因此我将函数调用手动添加到程序中.它可以正确返回Windows 7 x64上的内存(8GB)，但是在Vista x32系统上，它仍返回不正确的值(在该系统上应为4GB，但返回2.9GB).知道我可能做错了什么吗?GlobalMemoryStatusEx可以在较旧的操作系统上运行吗?

I need to get the total physical memory of a system using Delphi 2007. Using GlobalMemoryStatus on a system with 4GB or greater seems to give me errors. In Delphi 2007 GlobalMemoryStatusEx does not exist so I added the function call to my program manually. It returns the memory on my Windows 7 x64 correctly (8GB) but on a Vista x32 system it still returns an incorrect value (should be 4GB on this system but returns 2.9GB). Any Idea what I may be doing wrong? And will the GlobalMemoryStatusEx work on older operating systems?

type
  DWORDLONG = UInt64;

  PMemoryStatusEx = ^TMemoryStatusEx;
  TMemoryStatusEx = packed record
    dwLength: DWORD;
    dwMemoryLoad: DWORD;
    ullTotalPhys: DWORDLONG;
    ullAvailPhys: DWORDLONG;
    ullTotalPageFile: DWORDLONG;
    ullAvailPageFile: DWORDLONG;
    ullTotalVirtual: DWORDLONG;
    ullAvailVirtual: DWORDLONG;
    ullAvailExtendedVirtual: DWORDLONG;
  end;

function GlobalMemoryStatusEx(var lpBuffer: TMemoryStatusEx): BOOL; stdcall; external kernel32;

function getmemorysize:word;
var
  memory: TMemoryStatusEx;
begin
  FillChar(memory, SizeOf(memory), 0);
  memory.dwLength := SizeOf(memory);
  GlobalMemoryStatusEx(memory);
  result:=memory.ullTotalPhys div (1024*1024);
end;

推荐答案

这是可以预期的，您没有做错任何事情.Windows将不会在32位操作系统上报告4GB内存.这是来自MSDN的报价

This is to be expected, you're not doing anything wrong. Windows will not report 4GB ram on a 32bit OS. Here's a quote from an MSDN blog article entitled "The 3GB-not-4GB RAM problem":

由于很久以前就做出了架构决定，如果您有4GB的存储空间，安装了物理RAM，Windows只能报告一部分物理4GB RAM(范围从〜2.75GB到3.5GB，具体取决于安装的设备，主板的芯片组和BIOS).

Due to an architectural decision made long ago, if you have 4GB of physical RAM installed, Windows is only able to report a portion of the physical 4GB of RAM (ranges from ~2.75GB to 3.5GB depending on the devices installed, motherboard's chipset & BIOS).

GlobaMemoryStatusEx 应该可以在Windows 2000及更高版本上运行(较新的MSDN文档不包括Win2K，但较早的文档具有Win2K).

GlobaMemoryStatusEx should work from Windows 2000 and on (later MSDN documents exclude Win2K but earlier ones had it).

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