Question

How to get free and available and total disk space in bytes using kernel32.dll in C#

Answer 1

using System.Runtime.InteropServices;

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern bool GetDiskFreeSpaceEx(string lpDirectoryName,
                                    out ulong lpFreeBytesAvailable,
                                    out ulong lpTotalNumberOfBytes,
                                    out ulong lpTotalNumberOfFreeBytes);
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ulong freeBytesAvailable;
            ulong totalNumOfBytes;
            ulong totalNumOfFreeBytes;

            if (!GetDiskFreeSpaceEx("C:\\", out freeBytesAvailable, out totalNumOfBytes, out totalNumOfFreeBytes))
            {
                Console.Error.WriteLine("GetDiskFreeSpaceEx Error");
            }
            else
            {
                label1.Text = "";
                label1.Text += "Available bytes: " + string.Format("{0:n}", freeBytesAvailable) + Environment.NewLine;
                label1.Text += "Total # of bytes: " + string.Format("{0:n}", totalNumOfBytes) + Environment.NewLine;
                label1.Text += "Total free bytes: " + string.Format("{0:n}", totalNumOfFreeBytes) + Environment.NewLine;
            }
        }
    }
}



/*
 * run:
 *
 * Available bytes: 541,480,148,992.00
 * Total # of bytes: 999,559,262,208.00
 * Total free bytes: 541,480,148,992.00
 * 
 */

 

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