private static SafeFileHandle CreateFileHandle(
string devicePath,
NativeMethods.EFileAccess desiredAccess = 0, // If this parameter is zero, can query certain metadata without accessing device
NativeMethods.EFileAttributes fileAttribs = 0 // Use overlapped IO?
)
{
// Default security attributes
var security = new NativeMethods.SECURITY_ATTRIBUTES
{
lpSecurityDescriptor = IntPtr.Zero,
bInheritHandle = true,
nLength = Marshal.SizeOf(typeof(NativeMethods.SECURITY_ATTRIBUTES))
};
// Get safe handle to device
var handle = NativeMethods.CreateFile(devicePath,
desiredAccess,
NativeMethods.EFileShare.Read | NativeMethods.EFileShare.Write,
ref security,
NativeMethods.ECreationDisposition.OpenExisting,
fileAttribs,
IntPtr.Zero);
// Throw exception if handle isn't valid
if (handle.IsInvalid)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
// Return handle
return(handle);
}
public static extern SafeFileHandle CreateFile(
string lpFileName,
NativeMethods.EFileAccess dwDesiredAccess,
NativeMethods.EFileShare dwShareMode,
IntPtr lpSecurityAttributes,
NativeMethods.ECreationDisposition dwCreationDisposition,
NativeMethods.EFileAttributes dwFlagsAndAttributes,
IntPtr hTemplateFile);