private static NtResult <SafeHGlobalBuffer> GetClassProperty(Guid class_guid, CmClassType flags, DEVPROPKEY key, out DEVPROPTYPE type, bool throw_on_error) { int length = 0; var result = DeviceNativeMethods.CM_Get_Class_PropertyW(class_guid, key, out type, SafeHGlobalBuffer.Null, ref length, flags); if (result != CrError.BUFFER_SMALL) { return(result.ToNtStatus().CreateResultFromError <SafeHGlobalBuffer>(throw_on_error)); } using (var buffer = new SafeHGlobalBuffer(length)) { return(DeviceNativeMethods.CM_Get_Class_PropertyW(class_guid, key, out type, buffer, ref length, flags).ToNtStatus().CreateResult(throw_on_error, () => buffer.Detach())); } }
internal static NtResult <Guid> GetClassStringList(Guid class_guid, bool interface_guid, DEVPROPKEY key, bool throw_on_error) { int length = 16; var result = DeviceNativeMethods.CM_Get_Class_PropertyW(class_guid, key, out DEVPROPTYPE type, out Guid value, ref length, interface_guid ? CmClassType.Interface : CmClassType.Installer).ToNtStatus(); if (!result.IsSuccess()) { return(result.CreateResultFromError <Guid>(throw_on_error)); } if (type != DEVPROPTYPE.GUID) { return(NtStatus.STATUS_BAD_KEY.CreateResultFromError <Guid>(throw_on_error)); } return(value.CreateResult()); }