【Visual Studio Visual Csharp】Get Disk Free Space

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Runtime.InteropServices; using System.Windows.Forms; namespace getdiskfreespaceC { public partial class Form1 : Form { public Form1() { InitializeComponent(); comboBox1.SelectedIndex = 2; } private void Form1_Load(object sender, EventArgs e) { } ulong ConvertBytesToMegabytes(ulong bytes) { return (bytes / 1024) / 1024; } public ulong GetDiskSizeTotal(string volumeName, out ulong avail, out ulong total, out ulong totalfree) { MyClass.GetDiskFreeSpaceEx(volumeName, out avail, out total, out totalfree); return total; } public ulong GetDiskSize(string volumeName) { ulong avail = 0; ulong total = 0; ulong totalfree = 0; MyClass.GetDiskFreeSpaceEx(volumeName, out avail, out total, out totalfree); return total; } private void button1_Click(object sender, EventArgs e) { ulong avail = 0, total = 0, totalfree = 0; // read size GetDiskSizeTotal(comboBox1.SelectedItem.ToString(), out avail, out total, out totalfree); // write size in label label1.Text = "Avaliable disk space (for this user): " + ConvertBytesToMegabytes(avail).ToString() + " MB"; label2.Text = "Total disk space: " + ConvertBytesToMegabytes(GetDiskSizeTotal(comboBox1.SelectedItem.ToString(), out avail, out total, out totalfree)) + " MB"; label3.Text = "Free disk space: " + ConvertBytesToMegabytes(avail).ToString() + " MB"; } } public class MyClass { // import from kernel32.dll function GetDiskFreeSpaceEx (total amount) [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool GetDiskFreeSpaceEx(string lpDirectoryName, out ulong lpFreeBytesAvailable, out ulong lpTotalNumberOfBytes, out ulong lpTotalNumberOfFreeBytes); // import from kernel32.dll function GetDiskFreeSpaceEx [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool GetDiskFreeSpace(ulong GetDiskFreeSpace, out ulong lpSectorsPerCluster, out ulong lpBytesPerSector, out ulong lpNumberOfFreeClusters, out ulong lpTotalNumberOfClusters); } }