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C# 弹出USB外接硬盘（U盘）
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原文:C# 弹出USB外接硬盘（U盘）最近一个项目需要通过代码来弹出USB外接硬盘设备，经过google找到了下面这个类库：
http://www.codeproject.com/Articles/13530/Eject-USB-disks-using-C
不过这个类库只能在x86下使用，因此需要修改以下内容，使其适用于x64平台
修改DeviceClass为以下代码：
public List<Device> Devices
{
get
{
if (_devices == null)
{
_devices = new List<Device>();
int index = 0;
while (true)
{
Native.SP_DEVICE_INTERFACE_DATA interfaceData = new Native.SP_DEVICE_INTERFACE_DATA();
interfaceData.cbSize = (UInt32)Marshal.SizeOf(interfaceData);
if (!Native.SetupDiEnumDeviceInterfaces(_deviceInfoSet, IntPtr.Zero, ref _classGuid, (UInt32)index, ref interfaceData))
{
int error = Marshal.GetLastWin32Error();
if (error != Native.ERROR_NO_MORE_ITEMS)
throw new Win32Exception(error);
break;
}
Native.SP_DEVINFO_DATA devData = new Native.SP_DEVINFO_DATA();
IntPtr p = Marshal.AllocHGlobal(Marshal.SizeOf(devData));
Marshal.StructureToPtr(devData, p, true);
UInt32 size = 0;
if (!Native.SetupDiGetDeviceInterfaceDetail(_deviceInfoSet, ref interfaceData, IntPtr.Zero, 0, ref size, p))
{
int error = Marshal.GetLastWin32Error();
if (error != Native.ERROR_INSUFFICIENT_BUFFER)
throw new Win32Exception(error);
}
Native.SP_DEVICE_INTERFACE_DETAIL_DATA detailDataBuffer = new Native.SP_DEVICE_INTERFACE_DETAIL_DATA();
if (IntPtr.Size == 8) // for 64 bit operating systems
{
detailDataBuffer.cbSize = 8;
}
else
{
detailDataBuffer.cbSize = 4 + Marshal.SystemDefaultCharSize; // for 32 bit systems
}
IntPtr pBuf = Marshal.AllocHGlobal(Marshal.SizeOf(detailDataBuffer));
Marshal.StructureToPtr(detailDataBuffer, pBuf, true);
if (!Native.SetupDiGetDeviceInterfaceDetail(_deviceInfoSet, ref interfaceData, pBuf, size, ref size, p))
{
int error = Marshal.GetLastWin32Error();
if (error != Native.ERROR_INSUFFICIENT_BUFFER)
throw new Win32Exception(error);
}
devData = (Native.SP_DEVINFO_DATA)Marshal.PtrToStructure(p, typeof(Native.SP_DEVINFO_DATA));
Marshal.FreeHGlobal(p);
detailDataBuffer = (Native.SP_DEVICE_INTERFACE_DETAIL_DATA)Marshal.PtrToStructure(pBuf, typeof(Native.SP_DEVICE_INTERFACE_DETAIL_DATA));
Marshal.FreeHGlobal(pBuf);
string devicePath = detailDataBuffer.DevicePath;
Native.STORAGE_DEVICE_NUMBER storageDeviceNumber = GetDeviceNumber(devicePath);
Device device = CreateDevice(this, devData, devicePath, storageDeviceNumber.DeviceNumber);
_devices.Add(device);
index++;
}
_devices.Sort();
}
return _devices;
}
}
添加以下函数到DeviceClass.cs
internal Native.STORAGE_DEVICE_NUMBER GetDeviceNumber(string devicePath)
{
IntPtr hFile = Native.CreateFile(devicePath.TrimEnd(‘\\‘), 0, 0, IntPtr.Zero, Native.OPEN_EXISTING, 0, IntPtr.Zero);
if (hFile.ToInt32() == Native.INVALID_HANDLE_VALUE)
throw new Win32Exception(Marshal.GetLastWin32Error());
int bytesReturned;
Native.STORAGE_DEVICE_NUMBER storageDeviceNumber = new Native.STORAGE_DEVICE_NUMBER();
int size = Marshal.SizeOf(storageDeviceNumber);
IntPtr buffer = Marshal.AllocHGlobal(size);
try
{
if (!Native.DeviceIoControl(hFile, Native.IOCTL_STORAGE_GET_DEVICE_NUMBER, IntPtr.Zero, 0, buffer, size, out bytesReturned, IntPtr.Zero))
{
// do nothing here on purpose
}
}
finally
{
Native.CloseHandle(hFile);
}
if (bytesReturned > 0)
{
storageDeviceNumber = (Native.STORAGE_DEVICE_NUMBER)Marshal.PtrToStructure(buffer, typeof(Native.STORAGE_DEVICE_NUMBER));
}
Marshal.FreeHGlobal(buffer);
return storageDeviceNumber;
}
Native.cs 添加：
[StructLayout(LayoutKind.Sequential)]
internal struct STORAGE_DEVICE_NUMBER
{
public int DeviceType;
public int DeviceNumber;
public int PartitionNumber;
}
internal const int IOCTL_STORAGE_GET_DEVICE_NUMBER = 0x2D1080;
修改Volumn.cs
IntPtr hFile = Native.CreateFile(@"\\.\" + LogicalDrive, Native.GENERIC_READ, Native.FILE_SHARE_READ | Native.FILE_SHARE_WRITE, IntPtr.Zero, Native.OPEN_EXISTING, 0, IntPtr.Zero);
为：
IntPtr hFile = Native.CreateFile(@"\\.\" + LogicalDrive, 0, Native.FILE_SHARE_READ | Native.FILE_SHARE_WRITE, IntPtr.Zero, Native.OPEN_EXISTING, 0, IntPtr.Zero);
修改Native.cs
[StructLayout(LayoutKind.Sequential)]
internal class SP_DEVINFO_DATA
{
internal int cbSize = Marshal.SizeOf(typeof(SP_DEVINFO_DATA));
internal Guid classGuid = Guid.Empty; // temp
internal int devInst = 0; // dumy
internal int reserved = 0;
}
[StructLayout(LayoutKind.Sequential, Pack = 2)]
internal struct SP_DEVICE_INTERFACE_DETAIL_DATA
{
internal int cbSize;
internal short devicePath;
}
[StructLayout(LayoutKind.Sequential)]
internal class SP_DEVICE_INTERFACE_DATA
{
internal int cbSize = Marshal.SizeOf(typeof(SP_DEVICE_INTERFACE_DATA));
internal Guid interfaceClassGuid = Guid.Empty; // temp
internal int flags = 0;
internal int reserved = 0;
}
为：
[StructLayout(LayoutKind.Sequential)]
internal class SP_DEVINFO_DATA
{
internal int cbSize = Marshal.SizeOf(typeof(SP_DEVINFO_DATA));
internal Guid classGuid = Guid.Empty; // temp
internal int devInst = 0; // dumy
internal IntPtr reserved = IntPtr.Zero;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
internal struct SP_DEVICE_INTERFACE_DETAIL_DATA
{
internal Int32 cbSize;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
internal string DevicePath;
}
[StructLayout(LayoutKind.Sequential)]
internal struct SP_DEVICE_INTERFACE_DATA
{
internal UInt32 cbSize;
internal Guid interfaceClassGuid;
internal UInt32 flags;
internal UIntPtr reserved;
}
修改Volume.cs
IntPtr extentPtr = new IntPtr(buffer.ToInt32() + Marshal.SizeOf(typeof(long)) + i * Marshal.SizeOf(typeof(Native.DISK_EXTENT)));
为
IntPtr extentPtr = new IntPtr(buffer.ToInt64() + Marshal.SizeOf(typeof(long)) + i * Marshal.SizeOf(typeof(Native.DISK_EXTENT)));
源代码下载
原文：https://www.cnblogs.com/lonelyxmas/p/11107083.html
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