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Get available memory for a program

Posted on 2001-07-24
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Last Modified: 2010-04-06
Hi,

Is there an easy way to retrieve the available RAM memory on a pc, just like the Windows NT Task Manager shows.

I start some processes in my progam that take a lot of memory, so I want to check at startup whether there's enough free RAM memory available on the machine for my program to run.

Thanks,
JDN
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Question by:JDN
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4 Comments
 
LVL 17

Expert Comment

by:geobul
ID: 6312584
Hi,

try this:

procedure TForm1.Button1Click(Sender: TObject);
var
 PMemStat: ^TMemoryStatus;
begin
 New(PMemStat);
 GlobalMemoryStatus(PMemStat^);
 label1.Caption := Format ('Physical Memory Available to Windows: %10.0n KB', [pMemstat.dwAvailVirtual / 1024]);
 Dispose(PMemStat);
end;

About pMemstat.dw... from Help:

dwLength

Indicates the size of the structure. The calling process should set this member prior to calling GlobalMemoryStatus.

dwMemoryLoad

Specifies a number between 0 and 100 that gives a general idea of current memory utilization, in which 0 indicates no memory use and 100 indicates full memory use.

dwTotalPhys

Indicates the total number of bytes of physical memory.

dwAvailPhys

Indicates the number of bytes of physical memory available.

dwTotalPageFile

Indicates the total number of bytes that can be stored in the paging file. Note that this number does not represent the actual physical size of the paging file on disk.

dwAvailPageFile

Indicates the number of bytes available in the paging file.

dwTotalVirtual

Indicates the total number of bytes that can be described in the user mode portion of the virtual address space of the calling process.

dwAvailVirtual

Indicates the number of bytes of unreserved and uncommitted memory in the user mode portion of the virtual address space of the calling process.

Regards, Geo
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LVL 17

Expert Comment

by:geobul
ID: 6312628
Ops, the right example should be:

label1.Caption := Format ('Physical Memory Available to Windows: %10.0n KB', [pMemstat.dwTotalPhys / 1024]);
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LVL 21

Accepted Solution

by:
gemarti earned 50 total points
ID: 6313200
Which value do you want?

Take your pick


\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Edit6: TEdit;
    Edit7: TEdit;
    Edit8: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
GlobalMemoryInfo: TMemoryStatus; // holds the global memory status information
begin
   {set the size of the structure before the call}
  GlobalMemoryInfo.dwLength := SizeOf(GlobalMemoryInfo);

  {retrieve the global memory status...}
  GlobalMemoryStatus(GlobalMemoryInfo);

    {and display the information}
  Edit1.Text := IntToStr(GlobalMemoryInfo.dwLength)+' bytes';
  Edit2.Text := IntToStr(GlobalMemoryInfo.dwMemoryLoad)+' %';
  Edit3.Text := IntToStr(GlobalMemoryInfo.dwTotalPhys)+' bytes';
  Edit4.Text := IntToStr(GlobalMemoryInfo.dwAvailPhys)+ ' bytes';
  Edit5.Text := IntToStr(GlobalMemoryInfo.dwTotalPageFile)+ ' bytes';
  Edit6.Text := IntToStr(GlobalMemoryInfo.dwAvailPageFile)+ ' bytes';;
  Edit7.Text := IntToStr(GlobalMemoryInfo.dwTotalVirtual)+ ' bytes';
  Edit8.Text := IntToStr(GlobalMemoryInfo.dwAvailVirtual)+' bytes';
end;

end.
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Expert Comment

by:Moondancer
ID: 6976031
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