how can I get total physical memory in C#?

Question

hi all I using GlobalMemoryStatusEx function to retrieves information about memory, but this function don't work correctly, it return 0 for all properies. I have windows 7, I think this function don't work in WIN 7.

    [StructLayout(LayoutKind.Sequential)]
    internal struct MEMORYSTATUSEX
    {
        internal 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;
    }
    [return: MarshalAs(UnmanagedType.Bool)]
    [DllImport("Kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    internal static extern bool GlobalMemoryStatusEx(ref MEMORYSTATUSEX lpBuffer);

    private void btnGlobalMemoryStatusEX_Click(object sender, EventArgs e)
    {
        MEMORYSTATUSEX statEX = new MEMORYSTATUSEX();
        GlobalMemoryStatusEx(ref statEX);

        double d = (double)statEX.ullTotalPhys;
    }

Can any body tell me that where I wirte wrong code? tanx

Answer 1

Hello, you can use this templates:

long memory = Process.GetCurrentProcess().PeakVirtualMemorySize64;

And another properties with names Peak*64

Answer 2

How about:

My.Computer.Info.TotalPhysicalMemory
My.Computer.Info.AvailablePhysicalMemory

Answer 3

If c# you can:

Reference the Microsoft.VisualBasic assembly. Then import Microsoft.VisualBasic.Devices namespace.
And finally use ComputerInfo to get the total physical memory.

ComputerInfo myCompInfo = new ComputerInfo();
string physicalMemory = "Physical Memory: " + myCompInfo.TotalPhysicalMemory / 1000000 + " MB";

Answer 4

I find my mistake from: http://www.pinvoke.net/default.aspx/kernel32/GlobalMemoryStatusEx.html

I Changed

internal static extern bool GlobalMemoryStatusEx(ref MEMORYSTATUSEX lpBuffer);

To

static extern bool GlobalMemoryStatusEx([In, Out] MEMORYSTATUSEX lpBuffer);

and changed

GlobalMemoryStatusEx(ref statEX);

To

GlobalMemoryStatusEx(statEX);

It work correctly. Tanks

Answer 5

You forgot to set statEX.dwLength before calling GlobalMemoryStatusEx.

MEMORYSTATUSEX statEX = new MEMORYSTATUSEX();
statEX.dwLength = (uint)Marshal.SizeOf(typeof(MEMORYSTATUSEX));
GlobalMemoryStatusEx(ref statEX);