private static IEnumerable <DeviceNode> GetDeviceList(OptionalGuid class_guid, string enumerator, DiGetClassFlags flags)
{
var devices = new List <DeviceNode>();
DeviceNativeMethods.CM_Locate_DevNodeW(out int root, null, 0).ToNtStatus().ToNtException();
using (var p = DeviceNativeMethods.SetupDiGetClassDevsW(class_guid, enumerator, IntPtr.Zero, flags))
{
if (p.IsInvalid)
{
Win32Utils.GetLastWin32Error().ToNtException();
}
int index = 0;
int size = Marshal.SizeOf(typeof(SP_DEVINFO_DATA));
SP_DEVINFO_DATA dev_info = new SP_DEVINFO_DATA()
{
cbSize = size
};
while (DeviceNativeMethods.SetupDiEnumDeviceInfo(p, index++, ref dev_info))
{
if (dev_info.DevInst != root)
{
devices.Add(new DeviceNode(dev_info.DevInst));
}
dev_info.cbSize = size;
}
return(devices.AsReadOnly());
}
}
public Reader TryGetReader(Book book)
{
OptionalGuid res = _rental.TryGet(book.Id);
if (res.ContainsResult)
{
return(_readers.TryGet(res.Id));
}
return(null);
}
public bool TryReturnBook(Book book, Reader reader)
{
if (!_rental.GetBookRentStatus(book.Id))
{
return(false);
}
OptionalGuid result = _rental.TryGet(book.Id);
if (result.ContainsResult)
{
if (result.Id.Equals(reader.Id))
{
return(_rental.TryUpdate(book.Id, Guid.Empty));
}
}
return(false);
}
internal static extern bool AuditEnumerateSubCategories(
OptionalGuid pAuditCategoryGuid,
bool bRetrieveAllSubCategories,
out SafeAuditBuffer ppAuditSubCategoriesArray,
out uint pdwCountReturned
);
