正确获取磁盘大小

发布于 2024-09-28 19:04:16 字数 849 浏览 4 评论 0原文

我正在尝试获取已连接 USB 闪存驱动器的物理设备大小。我尝试过使用WMI。

        ManagementObjectSearcher mosDisks = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive WHERE Model = '" + cmbHdd.SelectedItem + "'");
        foreach (ManagementObject moDisk in mosDisks.Get())
        {
            lblCapacity.Text = "Capacity: " + moDisk["Size"];
        }

我尝试使用导入来获取几何图形：

        var geo = new DiskGeometry();
        uint returnedBytes;
        DeviceIoControl(Handle, 0x70000, IntPtr.Zero, 0, ref geo, (uint)Marshal.SizeOf(typeof(DiskGeometry)), out returnedBytes, IntPtr.Zero);
        return geo.DiskSize;

它们都返回一个值..但它不正确。

例如，上面的代码返回 250056737280。当我将整个二进制内容转储到新文件时，FileStream.Length 返回 250059350015

看看最后一个选项更大吗？这也是我的代码按预期工作所需的正确大小。但我无法转储 250GB 数据只是为了获得完整大小。那么还有其他方法可以获得合适的尺寸吗？

原文

I am trying to get the physical device size of a connected USB flash drive. I have tried using WMI.

        ManagementObjectSearcher mosDisks = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive WHERE Model = '" + cmbHdd.SelectedItem + "'");
        foreach (ManagementObject moDisk in mosDisks.Get())
        {
            lblCapacity.Text = "Capacity: " + moDisk["Size"];
        }

I have tried using imports to get the geometry:

        var geo = new DiskGeometry();
        uint returnedBytes;
        DeviceIoControl(Handle, 0x70000, IntPtr.Zero, 0, ref geo, (uint)Marshal.SizeOf(typeof(DiskGeometry)), out returnedBytes, IntPtr.Zero);
        return geo.DiskSize;

They all do return a value.. but it is not correct.

For example, the above code returns 250056737280.
When I dump the entire binary contents to a new file, FileStream.Length returns 250059350015

See how the last option is bigger? That is also the corrrect size I need to get for my code to work as expected. But I cannot dump 250gb of data just to get the full size.
So is there another method to get proper size?

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平定天下 2024-10-05 19:04:16

您可以考虑尝试使用 DevideIoControl IOCTL_DISK_GET_LENGTH_INFO。

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若能看破又如何 2024-10-05 19:04:16

这对你有用吗？

using System;
using System.Runtime.InteropServices;

public class MainClass
{
    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    static extern bool GetDiskFreeSpaceEx(string lpDirectoryName,
       out ulong lpFreeBytesAvailable,
       out ulong lpTotalNumberOfBytes,
       out ulong lpTotalNumberOfFreeBytes);
    public static void Main()
    {
        ulong freeBytesAvail;
        ulong totalNumOfBytes;
        ulong totalNumOfFreeBytes;

        if (!GetDiskFreeSpaceEx("C:\\", out freeBytesAvail, out totalNumOfBytes, out totalNumOfFreeBytes))
        {
            Console.Error.WriteLine("Error occurred: {0}",
                Marshal.GetExceptionForHR(Marshal.GetLastWin32Error()).Message);
        }
        else
        {
            Console.WriteLine("Free disk space:");
            Console.WriteLine("    Available bytes : {0}", freeBytesAvail);
            Console.WriteLine("    Total # of bytes: {0}", totalNumOfBytes);
            Console.WriteLine("    Total free bytes: {0}", totalNumOfFreeBytes);
        }
    }
}

在这里找到上面的示例： http://www.java2s.com/Tutorial/CSharp /0520__Windows/Getfreediskspace.htm

干杯。
贾斯。

Is this any use for you?

using System;
using System.Runtime.InteropServices;

public class MainClass
{
    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    static extern bool GetDiskFreeSpaceEx(string lpDirectoryName,
       out ulong lpFreeBytesAvailable,
       out ulong lpTotalNumberOfBytes,
       out ulong lpTotalNumberOfFreeBytes);
    public static void Main()
    {
        ulong freeBytesAvail;
        ulong totalNumOfBytes;
        ulong totalNumOfFreeBytes;

        if (!GetDiskFreeSpaceEx("C:\\", out freeBytesAvail, out totalNumOfBytes, out totalNumOfFreeBytes))
        {
            Console.Error.WriteLine("Error occurred: {0}",
                Marshal.GetExceptionForHR(Marshal.GetLastWin32Error()).Message);
        }
        else
        {
            Console.WriteLine("Free disk space:");
            Console.WriteLine("    Available bytes : {0}", freeBytesAvail);
            Console.WriteLine("    Total # of bytes: {0}", totalNumOfBytes);
            Console.WriteLine("    Total free bytes: {0}", totalNumOfFreeBytes);
        }
    }
}

Found the above example here: http://www.java2s.com/Tutorial/CSharp/0520__Windows/Getfreediskspace.htm

Cheers.
Jas.

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