C# Signature:

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport(kernel32, CharSet = CharSet.Auto, SetLastError = true)]
static extern bool GlobalMemoryStatusEx([In, Out] MEMORYSTATUSEX lpBuffer);

User-Defined Types:

MEMORYSTATUSEX

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

private void DisplayMemory()

        {
            string[] Drives = System.IO.Directory.GetLogicalDrives();
            long tm = System.GC.GetTotalMemory(true);
            UInt64 UserAvailable=0,Capacity=0,Available=0;
            if(Drives!=null)
            {
                int retval = GetDiskFreeSpaceExA(Drives[0],ref UserAvailable,ref Capacity,ref Available);
                this.lblDiskFree.Text = Available.ToString();
                this.lblDiskTotal.Text = Capacity.ToString();
            }
            MEMORYSTATUSEX msex=new MEMORYSTATUSEX();
            bool retval2 = GlobalMemoryStatusEx(msex);
            this.lblMemoryFree.Text = msex.ullAvailPhys.ToString();
            this.lblMemoryTotal.Text = msex.ullTotalPhys.ToString();
        }

        [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));
            }
        }


        [DllImport("kernel32.dll")]
        private static extern int GetDiskFreeSpaceExA(  string lpDirectoryName,
            ref System.UInt64 lpFreeBytesAvailable,
            ref System.UInt64 lpTotalNumberOfBytes,
            ref System.UInt64 lpTotalNumberOfFreeBytes
            );

        [DllImport("kernel32.dll")]
         [return: MarshalAs(UnmanagedType.Bool)]
         [DllImport(kernel32, CharSet = CharSet.Auto, SetLastError = true)]
         static extern bool GlobalMemoryStatusEx([In, Out] MEMORYSTATUSEX lpBuffer);

Alternative Managed API:

Do you know one? Please contribute it!