我尝试使用DeviceIoControl
函数(Win32 API函数)弹出我的CDROM驱动器,当我的CDROM驱动器没有磁盘时它可以正常工作,但是插入磁盘后,Marshal.GetLastWin32Error()
返回32(ERROR_SHARING_VIOLATION
:进程无法访问文件,因为它正在使用由另一个进程),传入的driveHandleDeviceIoControl
是由CreateFile()
函数创建的。
你能帮帮我吗?我喜欢这种操作 CD ROM 相关内容的方式,我可以使用 winmm.dll 来弹出我的 CDROM,但我认为这种方式值得一试。
好的,这里是代码:
using System;
using System.ComponentModel;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.InteropServices;
namespace DVD_ejector
{
public partial class Form1 : Form
{
const int OPENEXISTING = 3;
const int IOCTL_STORAGE_EJECT_MEDIA = 2967560;
const uint GENERICREAD = 0x80000000;
const int INVALID_HANDLE = -1;
public Form1()
{
InitializeComponent();
DriveInfo[] drs = DriveInfo.GetDrives();
List<DriveInfo> cdRoms = new List<DriveInfo>();
foreach (DriveInfo dInfo in drs)
{
if (dInfo.DriveType == DriveType.CDRom)
{
cdRoms.Add(dInfo);
}
}
comboBox1.DataSource = cdRoms;
comboBox1.DisplayMember = "Name";
if (comboBox1.Items.Count > 0) comboBox1.SelectedIndex = 0;
button1.Click += (sender, e) =>
{
Eject(@"\\.\" + ((DriveInfo)comboBox1.SelectedItem).Name[0]+":");
};
}
[DllImport("kernel32", SetLastError=true)]
static extern IntPtr CreateFile(string fileName, uint desiredAccess, uint shareMode, IntPtr attributes,uint creationDisposition, uint flagsAndAttribute, IntPtr fileTemplate);
[DllImport("kernel32")]
static extern int CloseHandle(IntPtr fileHandle);
[DllImport("kernel32")]
static extern bool DeviceIoControl(IntPtr driveHandle, int ctrlCode, IntPtr inBuffer, int inBufferSize, IntPtr outBuffer, int outBufferSize, ref int bytesReturned, IntPtr overlapped);
int bytesReturned;
private void Eject(string cdDrive)
{
IntPtr driveHandle = CreateFile(cdDrive, GENERICREAD, 0, IntPtr.Zero, OPENEXISTING, 0, IntPtr.Zero);
try
{
if((int)driveHandle != INVALID_HANDLE)
DeviceIoControl(driveHandle, IOCTL_STORAGE_EJECT_MEDIA, IntPtr.Zero, 0, IntPtr.Zero, 0, ref bytesReturned, IntPtr.Zero);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
CloseHandle(driveHandle);
}
}
}
}