How do you get total amount of RAM the computer has

Question

Using C   I want to get the total amount of RAM that my computer has  With the PerformanceCounter I can get the amount of Available ram  by setting   counter CategoryName    Memory   counter Countername    Available MBytes     But I can t seem to find a way to get the total amount of memory   How would I go about doing this   Update   MagicKat  I saw that when I was searching  but it doesn t work -  Are you missing an assembly or reference    I ve looked to add that to the References  but I don t see it there

User · Answer

You could use WMI  Found a snippit     Set objWMIService   GetObject  winmgmts      amp    impersonationLevel impersonate          amp  strComputer  amp    root cimv2    Set colComputer   objWMIService ExecQuery     Select   from Win32 ComputerSystem    For Each objComputer in colComputer    strMemory   objComputer TotalPhysicalMemory Next

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Add a reference to Microsoft VisualBasic dll  as someone mentioned above   Then getting total physical memory is as simple as this  yes  I tested it    static ulong GetTotalMemoryInBytes         return new Microsoft VisualBasic Devices ComputerInfo   TotalPhysicalMemory

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Another way to do this  is by using the  NET System Management querying facilities   string Query    SELECT Capacity FROM Win32 PhysicalMemory   ManagementObjectSearcher searcher   new ManagementObjectSearcher Query    UInt64 Capacity   0  foreach  ManagementObject WniPART in searcher Get          Capacity    Convert ToUInt64 WniPART Properties  Capacity   Value      return Capacity

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The Windows API function GlobalMemoryStatusEx can be called with p invoke     StructLayout LayoutKind Sequential  CharSet   CharSet Auto     private class MEMORYSTATUSEX          public uint dwLength       public uint dwMemoryLoad       public ulong ullTotalPhys       public ulong ullAvailPhys       public ulong ullTotalPageFile       public ulong ullAvailPageFile       public ulong ullTotalVirtual       public ulong ullAvailVirtual       public ulong ullAvailExtendedVirtual       public MEMORYSTATUSEX                  this dwLength    uint Marshal SizeOf typeof NativeMethods MEMORYSTATUSEX                    return  MarshalAs UnmanagedType Bool      DllImport  quot kernel32 dll quot   CharSet   CharSet Auto  SetLastError   true     static extern bool GlobalMemoryStatusEx  In  Out  MEMORYSTATUSEX lpBuffer    Then use like  ulong installedMemory  MEMORYSTATUSEX memStatus   new MEMORYSTATUSEX    if  GlobalMemoryStatusEx  memStatus         installedMemory   memStatus ullTotalPhys     Or you can use WMI  managed but slower  to query TotalPhysicalMemory in the Win32 ComputerSystem class

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you can simply use this code to get those information  just add the reference   using Microsoft VisualBasic Devices    and the simply use the following code       private void button1 Click object sender  EventArgs e                getAvailableRAM               public void getAvailableRAM                 ComputerInfo CI   new ComputerInfo            ulong mem   ulong Parse CI TotalPhysicalMemory ToString             richTextBox1 Text    mem    1024 1024      MB   ToString

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Nobody has mentioned GetPerformanceInfo yet  PInvoke signatures are available   This function makes the following system-wide information available    CommitTotal CommitLimit CommitPeak PhysicalTotal PhysicalAvailable SystemCache KernelTotal KernelPaged KernelNonpaged PageSize HandleCount ProcessCount ThreadCount   PhysicalTotal is what the OP is looking for  although the value is the number of pages  so to convert to bytes  multiply by the PageSize value returned

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The simplest way to get display total physical memory in VB net  Tested   public sub get total physical mem        dim total physical memory as integer      total physical memory CInt  My Computer Info TotalPhysicalMemory     1024   1024       MsgBox  Total Physical Memory    CInt  My Computer Info TotalPhysicalMemory     1024   1024   ToString    Mb    end sub        The simplest way to get display total physical memory in C   converted Form http   www developerfusion com tools convert vb-to-csharp   public void get total physical mem         int total physical memory   0       total physical memory   Convert ToInt32  My Computer Info TotalPhysicalMemory      1024   1024        Interaction MsgBox  Total Physical Memory    Convert ToInt32  My Computer Info TotalPhysicalMemory     1024   1024   ToString      Mb

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This function  ManagementQuery  works on Windows XP and later   private static string ManagementQuery string query  string parameter  string scope   null        string result   string Empty      var searcher   string IsNullOrEmpty scope    new ManagementObjectSearcher query    new ManagementObjectSearcher scope  query       foreach  var os in searcher Get              try               result   os parameter  ToString                      catch                 ignore                    if   string IsNullOrEmpty result                 break                       return result      Usage   Console WriteLine BytesToMb Convert ToInt64 ManagementQuery  SELECT TotalPhysicalMemory FROM Win32 ComputerSystem    TotalPhysicalMemory    root  CIMV2

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If you happen to be using Mono  then you might be interested to know that Mono 2 8  to be released later this year  will have a performance counter which reports the physical memory size on all the platforms Mono runs on  including Windows   You would retrieve the value of the counter using this code snippet   using System  using System Diagnostics   class app      static void Main                var pc   new PerformanceCounter   Mono Memory    Total Physical Memory           Console WriteLine   Physical RAM  bytes    0    pc RawValue            If you are interested in C code which provides the performance counter  it can be found here

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All the answers here  including the accepted one  will give you the total amount of RAM available for use   And that may have been what OP wanted   But if you are interested in getting the amount of installed RAM  then you ll want to make a call to the GetPhysicallyInstalledSystemMemory function   From the link  in the Remarks section      The GetPhysicallyInstalledSystemMemory function retrieves the amount of physically installed RAM from the computer s SMBIOS firmware tables  This can differ from the amount reported by the GlobalMemoryStatusEx function  which sets the ullTotalPhys member of the MEMORYSTATUSEX structure to the amount of physical memory that is available for the operating system to use  The amount of memory available to the operating system can be less than the amount of memory physically installed in the computer because the BIOS and some drivers may reserve memory as I O regions for memory-mapped devices  making the memory unavailable to the operating system and applications    Sample code    DllImport  kernel32 dll     return  MarshalAs UnmanagedType Bool   static extern bool GetPhysicallyInstalledSystemMemory out long TotalMemoryInKilobytes    static void Main         long memKb      GetPhysicallyInstalledSystemMemory out memKb       Console WriteLine  memKb   1024   1024      GB of RAM installed

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NIT has a limit to the amount of memory it can access of the total   Theres a percentage  and then 2 GB in xp was the hard ceiling   You could have 4 GB in it  and it would kill the app when it hit 2GB   Also in 64 bit mode  there is a percentage of memory you can use out of the system  so I m not sure if you can ask for the whole thing or if this is specifically guarded against

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Compatible with  Net and Mono  tested with Win10 FreeBSD CentOS   Using ComputerInfo source code and PerformanceCounters for Mono and as backup for  Net   using System  using System Diagnostics  using System Runtime InteropServices  using System Security   public class SystemMemoryInfo       private readonly PerformanceCounter  monoAvailableMemoryCounter      private readonly PerformanceCounter  monoTotalMemoryCounter      private readonly PerformanceCounter  netAvailableMemoryCounter       private ulong  availablePhysicalMemory      private ulong  totalPhysicalMemory       public SystemMemoryInfo                 try                       if  PerformanceCounterCategory Exists  Mono Memory                                   monoAvailableMemoryCounter   new PerformanceCounter  Mono Memory    Available Physical Memory                     monoTotalMemoryCounter   new PerformanceCounter  Mono Memory    Total Physical Memory                              else if  PerformanceCounterCategory Exists  Memory                                   netAvailableMemoryCounter   new PerformanceCounter  Memory    Available Bytes                                    catch                          ignored                      public ulong AvailablePhysicalMemory                SecurityCritical          get                       Refresh                 return  availablePhysicalMemory                       public ulong TotalPhysicalMemory                SecurityCritical          get                       Refresh                 return  totalPhysicalMemory                        SecurityCritical       DllImport  Kernel32   CharSet   CharSet Auto  SetLastError   true       private static extern void GlobalMemoryStatus ref MEMORYSTATUS lpBuffer         SecurityCritical       DllImport  Kernel32   CharSet   CharSet Auto  SetLastError   true        return  MarshalAs UnmanagedType Bool       private static extern bool GlobalMemoryStatusEx ref MEMORYSTATUSEX lpBuffer         SecurityCritical      private void Refresh                 try                       if   monoTotalMemoryCounter    null  amp  amp   monoAvailableMemoryCounter    null                                 totalPhysicalMemory    ulong   monoTotalMemoryCounter NextValue                     availablePhysicalMemory    ulong   monoAvailableMemoryCounter NextValue                              else if  Environment OSVersion Version Major  lt  5                                var memoryStatus   MEMORYSTATUS Init                    GlobalMemoryStatus ref memoryStatus                    if  memoryStatus dwTotalPhys  gt  0                                         availablePhysicalMemory   memoryStatus dwAvailPhys                       totalPhysicalMemory   memoryStatus dwTotalPhys                                    else if   netAvailableMemoryCounter    null                                         availablePhysicalMemory    ulong   netAvailableMemoryCounter NextValue                                                else                               var memoryStatusEx   MEMORYSTATUSEX Init                     if  GlobalMemoryStatusEx ref memoryStatusEx                                          availablePhysicalMemory   memoryStatusEx ullAvailPhys                       totalPhysicalMemory   memoryStatusEx ullTotalPhys                                    else if   netAvailableMemoryCounter    null                                         availablePhysicalMemory    ulong   netAvailableMemoryCounter NextValue                                                      catch                          ignored                      private struct MEMORYSTATUS               private uint dwLength          internal uint dwMemoryLoad          internal uint dwTotalPhys          internal uint dwAvailPhys          internal uint dwTotalPageFile          internal uint dwAvailPageFile          internal uint dwTotalVirtual          internal uint dwAvailVirtual           public static MEMORYSTATUS Init                         return new MEMORYSTATUS                               dwLength   checked  uint  Marshal SizeOf typeof MEMORYSTATUS                                        private struct MEMORYSTATUSEX               private uint dwLength          internal uint dwMemoryLoad          internal ulong ullTotalPhys          internal ulong ullAvailPhys          internal ulong ullTotalPageFile          internal ulong ullAvailPageFile          internal ulong ullTotalVirtual          internal ulong ullAvailVirtual          internal ulong ullAvailExtendedVirtual           public static MEMORYSTATUSEX Init                         return new MEMORYSTATUSEX                               dwLength   checked  uint  Marshal SizeOf typeof MEMORYSTATUSEX

User · Answer

Add a reference to Microsoft VisualBasic and a using Microsoft VisualBasic Devices    The ComputerInfo class has all the information that you need

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use    1048576  to get ram in MB    and     1048576   1024   or    1048576   1024  to get ram in GB private static String getRAMsize         ManagementClass mc   new ManagementClass  Win32 ComputerSystem        ManagementObjectCollection moc   mc GetInstances        foreach  ManagementObject item in moc               return Convert ToString Math Round Convert ToDouble item Properties  TotalPhysicalMemory   Value    1048576  0       MB              return  RAMsize

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For those who are using  net Core 3 0 there is no need to use PInvoke platform in order to get the available physical memory  The GC class has added a new method GC GetGCMemoryInfo that returns a GCMemoryInfo Struct with TotalAvailableMemoryBytes as a property  This property returns the total available memory for the garbage collector  same value as  MEMORYSTATUSEX   var gcMemoryInfo   GC GetGCMemoryInfo    installedMemory   gcMemoryInfo TotalAvailableMemoryBytes     it will give the size of memory in MB var physicalMemory    double  installedMemory   1048576 0

[c#] How do you get total amount of RAM the computer has?

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