Xrecord là đ i t ng thu c Collection Dictionaries. Khái ni m v Xrecord c ng t ng t nh Xdata, nh ng Xrecord không b gi i h n v kích th c c ng nh th t và nó có th ch a b t k lo i d li u nào.
Khác v i Xdata, XRecords ch a d li u trong standard AutoCAD group codes, t c là không ph i
B浦 MÔN T IN H窺C XÂY D衛NG KHOA CÔNG NGH烏 THÔN G TIN TR姶云NG A萎 I H窺C XÂY D衛NG
AutoCAD group codes đ u đ c s d ng đ ch a d li u. M t đi u quan tr ng n a là ta có th qu n lý Xrecord b ng object IDs.
Ví d : Các b c AutoCAD ghi l i các thông tin c a m t Layer nh sau :
̇ T o ra m t t đi n m r ng (Extension dictionary) trong layer collection.
̇ T o m t Dictionary object l y tên là ACAD_LAYERSTATE trong extension dictionary.
̇ L u t t c các thu c tính c a layer vào m t XRecord object trong ACAD_LAYERSTATE dictionary. AutoCAD l u t t c các thi t l p c a các layer vào Xrecord n u b n ch n ch c n ng Save. Khi b n khôi ph c l i (restore the layer setting, AutoCAD s l y d li u t XRecord đ khôi ph c l i).
Nh v y, ta c ng có th ghi l i các d li u c n thi t trong quá trình l p trình s lý b n v b ng cách s d ng Xrecord.
Nh ng Group code sau có th đ c s d ng trong XRecord objects:
̇ 100 : Subclass marker (AcDbXrecord)
̇ 1-369 : (except 5 and 105)
XRecord obects đ c ghi l i cùng v i b n v , và chúng có th đ c truy c p m t cách tr c ti p b i ObjectARX và LISP. Do v y, n u b n c n b o m t d li u, b n ph i mã hóa chúng. :
VBA class name: AcadXRecord
Create using: Dictionary.AddXRecord
Access via: Dictionary.Item
2. Ph ng th c AddXRecord
RetVal = object.AddXRecord(Keyword)
̇ Object : ki u Dictionary, đ i t ng s ch a XRecord.
̇ Keyword : String, input-only. Là tên c a XRecord trong dictionary.
̇ RetVal : XRecord object Sub Example_AddXRecord()
' This example creates a new XRecord if one doesn't exist,
' appends data to the XRecord, and then reads it back. To see data being added, ' run the example more than once.
Dim TrackingDictionary As AcadDictionary, TrackingXRecord As AcadXRecord Dim XRecordDataType As Variant, XRecordData As Variant
Dim ArraySize As Long, iCount As Long
Dim DataType As Integer, Data As String, msg As String
' Unique identifiers to distinguish this XRecordData from other XRecordData Const TYPE_STRING = 1
Const TAG_DICTIONARY_NAME = "ObjectTrackerDictionary"
B浦 MÔN T IN H窺C XÂY D衛NG KHOA CÔNG NGH烏 THÔN G TIN TR姶云NG A萎 I H窺C XÂY D衛NG
Const TAG_XRECORD_NAME = "ObjectTrackerXRecord" ' Connect to the dictionary in which to store the XRecord (adsbygoogle = window.adsbygoogle || []).push({});
On Error GoTo CREATE
Set TrackingDictionary = ThisDrawing.Dictionaries(TAG_DICTIONARY_NAME) Set TrackingXRecord = TrackingDictionary.GetObject(TAG_XRECORD_NAME) On Error GoTo 0
' Get current XRecordData
TrackingXRecord.GetXRecordData XRecordDataType, XRecordData ' If there is no array yet then create one
If VarType(XRecordDataType) And vbArray = vbArray Then ArraySize = UBound(XRecordDataType) + 1
' Get the size of the data elements returned ArraySize = ArraySize + 1
' Increase to hold new data
ReDim Preserve XRecordDataType(0 To ArraySize) ReDim Preserve XRecordData(0 To ArraySize) Else
ArraySize = 0
ReDim XRecordDataType(0 To ArraySize) As Integer ReDim XRecordData(0 To ArraySize) As Variant End If
' Append new XRecord Data
' For this sample we only append the current time to the XRecord
XRecordDataType(ArraySize) = TYPE_STRING: XRecordData(ArraySize) = _ CStr(Now)
TrackingXRecord.SetXRecordData XRecordDataType, XRecordData ' Read back all XRecordData entries
TrackingXRecord.GetXRecordData XRecordDataType, XRecordData ArraySize = UBound(XRecordDataType)
' Retrieve and display stored XRecordData For iCount = 0 To ArraySize
' Get information for this element
DataType = XRecordDataType(iCount) Data = XRecordData(iCount) If DataType = TYPE_STRING Then msg = msg & Data & vbCrLf End If
Next
MsgBox "The data in the XRecord is: " & vbCrLf & vbCrLf & msg, vbInformation
Exit Sub CREATE:
' Create the objects that hold this XRecordData
If TrackingDictionary Is Nothing Then ' Make sure to have tracking object Set TrackingDictionary = _ ThisDrawing.Dictionaries.Add(TAG_DICTIONARY_NAME) Set TrackingXRecord = _ B浦 MÔN T IN H窺C XÂY D衛NG KHOA CÔNG NGH烏 THÔN G TIN TR姶云NG A萎 I H窺C XÂY D衛NG
TrackingDictionary.AddXRecord(TAG_XRECORD_NAME) End If
Resume End Sub
3. Ph ng th c SetXRecordData
object.SetXRecordData XRecordDataType, XRecordData
̇ Object : ki u XRecord Object, đ i t ng s ch a d li u. (adsbygoogle = window.adsbygoogle || []).push({});
̇ XrecordDataType : Variant (array of short); input-only. The following group codes are common to all XRecord objects:
Group codes Description
100 Subclass marker (AcDbXrecord)
1-369 (except 5 and 105) Giá tr có th đ c s d ng b i b t k ng d ng nào.
4. Ph ng th c GetXRecordData
object.GetXRecordData XRecordDataType, XRecordDataValue
̇ Object : ki u XRecord Object, đ i t ng s ch a d li u.
̇ XrecordDataType : Variant (array of short); Output-only.
Sub Example_SetXRecordData()
' This example creates a new XRecord if one doesn't exist,
' appends data to the XRecord, and reads it back. To see data being added, ' run the example more than once.
Dim TrackingDictionary As AcadDictionary, TrackingXRecord As AcadXRecord Dim XRecordDataType As Variant, XRecordData As Variant
Dim ArraySize As Long, iCount As Long
Dim DataType As Integer, Data As String, msg As String
' Unique identifiers to distinguish our XRecordData from other XRecordData Const TYPE_STRING = 1
Const TAG_DICTIONARY_NAME = "ObjectTrackerDictionary" Const TAG_XRECORD_NAME = "ObjectTrackerXRecord" ' Connect to the dictionary in which the XRecord is stored
On Error GoTo CREATE
Set TrackingDictionary = ThisDrawing.Dictionaries(TAG_DICTIONARY_NAME) Set TrackingXRecord = TrackingDictionary.GetObject(TAG_XRECORD_NAME) On Error GoTo 0
' Get current XRecordData
TrackingXRecord.GetXRecordData XRecordDataType, XRecordData
' If there is no array already, create one
If VarType(XRecordDataType) And vbArray = vbArray Then ArraySize = UBound(XRecordDataType) + 1 ' Get the size of the data elements returned
ArraySize = ArraySize + 1 B浦 MÔN T IN H窺C XÂY D衛NG KHOA CÔNG NGH烏 THÔN G TIN TR姶云NG A萎 I H窺C XÂY D衛NG
' Increase to hold new data
ReDim Preserve XRecordDataType(0 To ArraySize) ReDim Preserve XRecordData(0 To ArraySize) Else
ArraySize = 0
ReDim XRecordDataType(0 To ArraySize) As Integer ReDim XRecordData(0 To ArraySize) As Variant End If (adsbygoogle = window.adsbygoogle || []).push({});
' Append new XRecord Data '
' For this sample, we only append the current time to the XRecord
XRecordDataType(ArraySize) = TYPE_STRING: XRecordData(ArraySize) = _ CStr(Now)
TrackingXRecord.SetXRecordData XRecordDataType, XRecordData ' Read back all XRecordData entries
TrackingXRecord.GetXRecordData XRecordDataType, XRecordData ArraySize = UBound(XRecordDataType)
' Retrieve and display stored XRecordData For iCount = 0 To ArraySize ' Get information for this element
DataType = XRecordDataType(iCount) Data = XRecordData(iCount)
If DataType = TYPE_STRING Then msg = msg & Data & vbCrLf End If
Next
MsgBox "The data in the XRecord is: " & vbCrLf & vbCrLf & msg, vbInformation
Exit Sub CREATE:
' Create the objects that hold the XRecordData
If TrackingDictionary Is Nothing Then ' Make sure the tracking object is there Set TrackingDictionary = _ ThisDrawing.Dictionaries.Add(TAG_DICTIONARY_NAME) Set TrackingXRecord = _ TrackingDictionary.AddXRecord(TAG_XRECORD_NAME) End If Resume End Sub B浦 MÔN T IN H窺C XÂY D衛NG KHOA CÔNG NGH烏 THÔN G TIN TR姶云NG A萎 I H窺C XÂY D衛NG