Question

我正在尝试使用DiskInfo对象函数获取CD或DVD的可用磁盘空间，但从未成功过。我知道CDROM是一个只读文件系统，当它上面的每个位都被认为是已分配的，因此当任何人试图使用普通函数获取磁盘上的可用空间时都会失败。我也尝试使用wmic api但也失败了。

这是我的代码：

foreach (var drive in DriveInfo.GetDrives())
{
    double freeSpace = drive.TotalFreeSpace;
    double totalSpace = drive.TotalSize;
    double percentFree = (freeSpace / totalSpace) * 100;
    float num = (float)percentFree;

    Console.WriteLine("Drive:{0} With {1} % free", drive.Name, num);
    Console.WriteLine("Space Remaining:{0}", drive.AvailableFreeSpace);
    Console.WriteLine("Percent Free Space:{0}", percentFree);
    Console.WriteLine("Space used:{0}", drive.TotalSize);
    Console.WriteLine("Type: {0}", drive.DriveType);
}

下面是我试过的任何c＃代码都会返回的示例。

信：C - 总计：244095 - 免费：75851 - 类型：已解决信：E - 总计：NULL- 免费：NULL- 类型：CDRom

在下面的@kettch和@Craig Selbert回复之后，我尝试使用GetDiskFreeSpaceEx函数的另一种方式，但它可能不起作用，这是我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;

namespace IMAPIv2
{
    public class Burn
    {
        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool GetDiskFreeSpaceEx(string lpDirectoryName,
        out ulong lpFreeBytesAvailable,
        out ulong lpTotalNumberOfBytes,
        out ulong lpTotalNumberOfFreeBytes);


        ImageMaster _imageMaster;

        public String burnData(String filesToBurn,String driverIndex,String volumeLabel,String boolColseMedia,String boolEject){
            try
            {

                String[] sep = { "<!>" };
                String[] files = filesToBurn.Split(sep, StringSplitOptions.RemoveEmptyEntries);
                DriveInfo driver = getSelectedDriver(int.Parse(driverIndex));
                Console.WriteLine(driver.Name);
                Console.WriteLine(getDirSize(driver.Name));

                ulong FreeBytesAvailable;
                ulong TotalNumberOfBytes;
                ulong TotalNumberOfFreeBytes;

                bool success = GetDiskFreeSpaceEx(driver.Name, out FreeBytesAvailable, out TotalNumberOfBytes,
                                   out TotalNumberOfFreeBytes);
                if (!success)
                    throw new System.ComponentModel.Win32Exception();

                Console.WriteLine("Free Bytes Available:      {0,15:D}", FreeBytesAvailable);
                Console.WriteLine("Total Number Of Bytes:     {0,15:D}", TotalNumberOfBytes);
                Console.WriteLine("Total Number Of FreeBytes: {0,15:D}", TotalNumberOfFreeBytes);

                _imageMaster = new ImageMaster();
                _imageMaster._recorders.SelectedIndex = Convert.ToInt32(driverIndex);
                _imageMaster.LoadRecorder();
                _imageMaster.totalFilesToBurn = addFilesToBurn(files);
                _imageMaster.VolumeLabel = volumeLabel;
                _imageMaster.LoadMedia();
                _imageMaster.WriteImage(BurnVerificationLevel.Quick, Convert.ToBoolean(boolColseMedia), Convert.ToBoolean(boolEject));
            }
            catch (Exception e)
            {
                throw e;
            }
            String[] res = { "P:Finished" };
            return res[0];
    }

    private long addFilesToBurn(String[] files)
    {
        long totalSize = 0;
        for (int i = 0; i < files.Length; i++)
        {
            FileAttributes attr = File.GetAttributes(files[i]);
            if ((attr & FileAttributes.Directory) == FileAttributes.Directory)
            {
                _imageMaster.Nodes.Add(new DirectoryNode(files[i]));
            }
            else
            {
                _imageMaster.Nodes.Add(new FileNode(files[i]));
                totalSize += new FileNode(files[i]).SizeOnDisc;
            }
        }
        return totalSize;

    }

    private DriveInfo getSelectedDriver(int driverindex)
    {
        DriveInfo[] df = DriveInfo.GetDrives();
        DriveInfo selectedDriver = null;
        int index  = 0;
        foreach ( DriveInfo d in df){
            if (d.DriveType.Equals(DriveType.CDRom)){
                if(index == driverindex){
                    selectedDriver= d;
                    break;
                }
                index++;
            }
        }

        if (selectedDriver == null){
            if (index == 0)
            {
                throw new InvalidOperationException("Please make sure you have a working optical drive to continue");
            }
            else
            {
                foreach (DriveInfo d in df)
                {
                    if (d.DriveType.Equals(DriveType.CDRom))
                    {
                       selectedDriver = d;
                       break;
                    }
                }
            }
        }

        return selectedDriver;


    }

    private long getDirSize(String dir)
    {
        long s = 0;
        DirectoryInfo df = new DirectoryInfo(dir);
        foreach (FileInfo f in df.GetFiles())
        {
            s += f.Length;
        }

        foreach (DirectoryInfo d in df.GetDirectories())
        {
            s += getDirSize(d.FullName);
        }

        return s;
    }






    }
}

此代码的输出为：

E:\
296589891
Free Bytes Available:                    0
Total Number Of Bytes:              309248
Total Number Of Free Bytes:               0

可用磁盘空间始终返回为零，但它不是如图所示

withEnv

任何帮助将不胜感激，提前谢谢。

如何使用C＃获取CD或DVD可用空间

0 个答案: