AttributeCollection プロパティを使用してブロック参照の属性情報を書き出すことができます。AttributeCollection プロパティはブロックにアタッチされた属性参照のコレクションです。コレクションの実行時に、IsConstant プロパティを使用して、属性値を変更できるかどうかを確認できます。
属性情報を書き出す際にテンプレート ファイルは必要ではありません。また、属性情報ファイルは作成されません。属性情報を調べるには、その属性参照の Tag および TextString プロパティを使用して、属性参照のコレクションを反復処理します。また、IsMTextAttribute が True であるか False であるかを確認することも必要です。True の場合は、MTextAttribute プロパティでマルチ テキスト属性のテキスト値を取得する必要があります。
属性情報の書き出しの詳細については、製品のヘルプ システムで「概要：概要 - ブロック属性からデータを書き出す」を参照してください。
次の例では、ブロックを作成し、そのブロックに属性を追加します。次に、ブロックを図面に挿入します。次に、返された属性データを、メッセージ ボックスを使用して表示します。この属性データをブロック参照用に更新してから、返された属性データをもう一度表示します。
Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
<CommandMethod("GettingAttributes")> _
Public Sub GettingAttributes()
' Get the current database and start a transaction
Dim acCurDb As Autodesk.AutoCAD.DatabaseServices.Database
acCurDb = Application.DocumentManager.MdiActiveDocument.Database
Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()
' Open the Block table for read
Dim acBlkTbl As BlockTable
acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead)
Dim blkRecId As ObjectId = ObjectId.Null
If Not acBlkTbl.Has("TESTBLOCK") Then
Using acBlkTblRec As New BlockTableRecord
acBlkTblRec.Name = "TESTBLOCK"
' Set the insertion point for the block
acBlkTblRec.Origin = New Point3d(0, 0, 0)
' Add an attribute definition to the block
Using acAttDef As New AttributeDefinition
acAttDef.Position = New Point3d(5, 5, 0)
acAttDef.Prompt = "Attribute Prompt"
acAttDef.Tag = "AttributeTag"
acAttDef.TextString = "Attribute Value"
acAttDef.Height = 1
acAttDef.Justify = AttachmentPoint.MiddleCenter
acBlkTblRec.AppendEntity(acAttDef)
acBlkTbl.UpgradeOpen()
acBlkTbl.Add(acBlkTblRec)
acTrans.AddNewlyCreatedDBObject(acBlkTblRec, True)
End Using
blkRecId = acBlkTblRec.Id
End Using
Else
blkRecId = acBlkTbl("TESTBLOCK")
End If
' Create and insert the new block reference
If blkRecId <> ObjectId.Null Then
Dim acBlkTblRec As BlockTableRecord
acBlkTblRec = acTrans.GetObject(blkRecId, OpenMode.ForRead)
Using acBlkRef As New BlockReference(New Point3d(5, 5, 0), acBlkTblRec.Id)
Dim acCurSpaceBlkTblRec As BlockTableRecord
acCurSpaceBlkTblRec = acTrans.GetObject(acCurDb.CurrentSpaceId, OpenMode.ForWrite)
acCurSpaceBlkTblRec.AppendEntity(acBlkRef)
acTrans.AddNewlyCreatedDBObject(acBlkRef, True)
' Verify block table record has attribute definitions associated with it
If acBlkTblRec.HasAttributeDefinitions Then
' Add attributes from the block table record
For Each objID As ObjectId In acBlkTblRec
Dim dbObj As DBObject = acTrans.GetObject(objID, OpenMode.ForRead)
If TypeOf dbObj Is AttributeDefinition Then
Dim acAtt As AttributeDefinition = dbObj
If Not acAtt.Constant Then
Using acAttRef As New AttributeReference
acAttRef.SetAttributeFromBlock(acAtt, acBlkRef.BlockTransform)
acAttRef.Position = acAtt.Position.TransformBy(acBlkRef.BlockTransform)
acAttRef.TextString = acAtt.TextString
acBlkRef.AttributeCollection.AppendAttribute(acAttRef)
acTrans.AddNewlyCreatedDBObject(acAttRef, True)
End Using
End If
End If
Next
' Display the tags and values of the attached attributes
Dim strMessage As String = ""
Dim attCol As AttributeCollection = acBlkRef.AttributeCollection
For Each objID As ObjectId In attCol
Dim dbObj As DBObject = acTrans.GetObject(objID, OpenMode.ForRead)
Dim acAttRef As AttributeReference = dbObj
strMessage = strMessage & "Tag: " & acAttRef.Tag & vbCrLf & _
"Value: " & acAttRef.TextString & vbCrLf
' Change the value of the attribute
acAttRef.TextString = "NEW VALUE!"
Next
MsgBox("The attributes for blockReference " & acBlkRef.Name & " are: " & vbCrLf & strMessage)
strMessage = ""
For Each objID As ObjectId In attCol
Dim dbObj As DBObject = acTrans.GetObject(objID, OpenMode.ForRead)
Dim acAttRef As AttributeReference = dbObj
strMessage = strMessage & "Tag: " & acAttRef.Tag & vbCrLf & _
"Value: " & acAttRef.TextString & vbCrLf
Next
MsgBox("The attributes for blockReference " & acBlkRef.Name & " are: " & vbCrLf & strMessage)
End If
End Using
End If
' Save the new object to the database
acTrans.Commit()
' Dispose of the transaction
End Using
End Sub
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
[CommandMethod("GettingAttributes")]
public void GettingAttributes()
{
// Get the current database and start a transaction
Database acCurDb;
acCurDb = Application.DocumentManager.MdiActiveDocument.Database;
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
// Open the Block table for read
BlockTable acBlkTbl;
acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead) as BlockTable;
ObjectId blkRecId = ObjectId.Null;
if (!acBlkTbl.Has("TESTBLOCK"))
{
using (BlockTableRecord acBlkTblRec = new BlockTableRecord())
{
acBlkTblRec.Name = "TESTBLOCK";
// Set the insertion point for the block
acBlkTblRec.Origin = new Point3d(0, 0, 0);
// Add an attribute definition to the block
using (AttributeDefinition acAttDef = new AttributeDefinition())
{
acAttDef.Position = new Point3d(5, 5, 0);
acAttDef.Prompt = "Attribute Prompt";
acAttDef.Tag = "AttributeTag";
acAttDef.TextString = "Attribute Value";
acAttDef.Height = 1;
acAttDef.Justify = AttachmentPoint.MiddleCenter;
acBlkTblRec.AppendEntity(acAttDef);
acBlkTbl.UpgradeOpen();
acBlkTbl.Add(acBlkTblRec);
acTrans.AddNewlyCreatedDBObject(acBlkTblRec, true);
}
blkRecId = acBlkTblRec.Id;
}
}
else
{
blkRecId = acBlkTbl["CircleBlockWithAttributes"];
}
// Create and insert the new block reference
if (blkRecId != ObjectId.Null)
{
BlockTableRecord acBlkTblRec;
acBlkTblRec = acTrans.GetObject(blkRecId, OpenMode.ForRead) as BlockTableRecord;
using (BlockReference acBlkRef = new BlockReference(new Point3d(5, 5, 0), acBlkTblRec.Id))
{
BlockTableRecord acCurSpaceBlkTblRec;
acCurSpaceBlkTblRec = acTrans.GetObject(acCurDb.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
acCurSpaceBlkTblRec.AppendEntity(acBlkRef);
acTrans.AddNewlyCreatedDBObject(acBlkRef, true);
// Verify block table record has attribute definitions associated with it
if (acBlkTblRec.HasAttributeDefinitions)
{
// Add attributes from the block table record
foreach (ObjectId objID in acBlkTblRec)
{
DBObject dbObj = acTrans.GetObject(objID, OpenMode.ForRead) as DBObject;
if (dbObj is AttributeDefinition)
{
AttributeDefinition acAtt = dbObj as AttributeDefinition;
if (!acAtt.Constant)
{
using (AttributeReference acAttRef = new AttributeReference())
{
acAttRef.SetAttributeFromBlock(acAtt, acBlkRef.BlockTransform);
acAttRef.Position = acAtt.Position.TransformBy(acBlkRef.BlockTransform);
acAttRef.TextString = acAtt.TextString;
acBlkRef.AttributeCollection.AppendAttribute(acAttRef);
acTrans.AddNewlyCreatedDBObject(acAttRef, true);
}
}
}
}
// Display the tags and values of the attached attributes
string strMessage = "";
AttributeCollection attCol = acBlkRef.AttributeCollection;
foreach (ObjectId objID in attCol)
{
DBObject dbObj = acTrans.GetObject(objID, OpenMode.ForRead) as DBObject;
AttributeReference acAttRef = dbObj as AttributeReference;
strMessage = strMessage + "Tag: " + acAttRef.Tag + "\n" +
"Value: " + acAttRef.TextString + "\n";
// Change the value of the attribute
acAttRef.TextString = "NEW VALUE!";
}
Application.ShowAlertDialog("The attributes for blockReference " + acBlkRef.Name + " are:\n" + strMessage);
strMessage = "";
foreach (ObjectId objID in attCol)
{
DBObject dbObj = acTrans.GetObject(objID, OpenMode.ForRead) as DBObject;
AttributeReference acAttRef = dbObj as AttributeReference;
strMessage = strMessage + "Tag: " + acAttRef.Tag + "\n" +
"Value: " + acAttRef.TextString + "\n";
}
Application.ShowAlertDialog("The attributes for blockReference " + acBlkRef.Name + " are:\n" + strMessage);
}
}
}
// Save the new object to the database
acTrans.Commit();
// Dispose of the transaction
}
}
Sub GettingAttributes()
' Create the block
Dim blockObj As AcadBlock
Dim insertionPnt(0 To 2) As Double
insertionPnt(0) = 0
insertionPnt(1) = 0
insertionPnt(2) = 0
Set blockObj = ThisDrawing.Blocks.Add(insertionPnt, "TESTBLOCK")
' Define the attribute definition
Dim attributeObj As AcadAttribute
Dim height As Double
Dim mode As Long
Dim prompt As String
Dim insertionPoint(0 To 2) As Double
Dim tag As String
Dim value As String
height = 1
prompt = "Attribute Prompt"
insertionPoint(0) = 5
insertionPoint(1) = 5
insertionPoint(2) = 0
tag = "AttributeTag"
value = "Attribute Value"
' Create the attribute definition object on the block
Set attributeObj = blockObj.AddAttribute(height, mode, prompt, insertionPoint, tag, value)
' Insert the block
Dim blockRefObj As AcadBlockReference
insertionPnt(0) = 2
insertionPnt(1) = 2
insertionPnt(2) = 0
Set blockRefObj = ThisDrawing.ModelSpace.InsertBlock(insertionPnt, "TESTBLOCK", 1, 1, 1, 0)
' Get the attributes for the block reference
Dim varAttributes As Variant
varAttributes = blockRefObj.GetAttributes
' Move the attribute tags and values into a
' string to be displayed in a Msgbox
Dim strAttributes As String
strAttributes = ""
Dim I As Integer
For I = LBound(varAttributes) To UBound(varAttributes)
strAttributes = strAttributes + " Tag: " + _
varAttributes(I).TagString + vbCrLf + _
" Value: " + varAttributes(I).textString
Next
MsgBox "The attributes for blockReference " + _
blockRefObj.Name & " are: " & vbCrLf & strAttributes
' Change the value of the attribute
' Note: There is no SetAttributes. Once you have the
' variant array, you have the objects.
' Changing them changes the objects in the drawing.
varAttributes(0).textString = "NEW VALUE!"
' Get the attributes again
Dim newvarAttributes As Variant
newvarAttributes = blockRefObj.GetAttributes
' Again, display the tags and values
strAttributes = ""
For I = LBound(varAttributes) To UBound(varAttributes)
strAttributes = strAttributes + " Tag: " + _
newvarAttributes(I).TagString + vbCrLf + _
" Value: " + newvarAttributes(I).textString
Next
MsgBox "The attributes for blockReference " & _
blockRefObj.Name & " are: " & vbCrLf & strAttributes
End Sub