利用VB为AutoCADR14的实体添加和读出扩展数据0吸尘管

利用VB为AutoCADR14的实体添加和读出扩展数据

利用VB为AutoCADR14的实体添加和读出扩展数据 2011年12月10日 来源： 扩展数据是AutoCAD最有特色的功能，程序员可以为实体附加必要的扩展数据，使实体带有具体的含义，而不是单纯的一个AutoCAD图元。扩展数据有许多用处，除可以存放数据外，还可以利用扩展数据获取选择集。下面是两个关于扩展数据的示例：Private Sub Command4_Click()Dim ent As ObjectDim startPoint(0 To 2) As DoubleDim endPoint(0 To 2) As DoubleDim dataType(0 To 3) As IntegerDim data(0 To 3) As VariantSet objAcad = GetObject(, "AutoCAD.Application") ' 获得AutoCAD R14对象Set objDoc = objAcad.ActiveDocumentstartPoint(0) = 10#startPoint(1) = 10#startPoint(2) = 0#endPoint(0) = 20#endPoint(1) = 10#endPoint(2) = 0#dataType(0) = 1001 '扩展数据组的应用名data(0) = "管道专业扩展数据"dataType(1) = 1000data(1) = "供水管"dataType(2) = 1040 '长度data(2) = 15.5dataType(3) = 1070 '公称直径data(3) = 32' 画 LINESet ent = objDoc.ModelSpace.AddLine(startPoint, endPoint)With ent.Color = 1 ' 改用红色Call .SetXData(dataType, data) '写入扩展数据End WithSet objAcad = NothingEnd SubPrivate Sub Command5_Click()Dim UtilObj As ObjectDim sset As ObjectDim ent As ObjectDim Point1(0 To 2) As DoubleDim Point2(0 To 2) As DoubleDim gpCode(0 To 1) As IntegerDim dataValue(0 To 1) As VariantDim varData As VariantDim groupCode As Variant, dataCode As VariantDim xdataType As VariantDim xdataValue As VariantSet objAcad = GetObject(, "AutoCAD.Application") ' 获得AutoCAD R14对象Set objDoc = objAcad.ActiveDocumentOn Error GoTo Error_GetEntitySet UtilObj = objAcad.ActiveDocument.Utility' 初始化名为 ss1 的一个选择集Set sset = objAcad.ActiveDocument.SelectionSets.Add("ss1")' 获得系统变量 LIMMIN 用于设置第一个虚拟点varData = objAcad.ActiveDocument.GetVariable("LIMMIN")Point1(0) = varData(0)Point1(1) = varData(1)Point1(2) = 0#' 获得系统变量 LIMMAX 用于设置第二个虚拟点varData = objAcad.ActiveDocument.GetVariable("LIMMAX")Point2(0) = varData(0)Point2(1) = varData(1)Point2(2) = 0#gpCode(0) = 0 ' 设置第一个过滤条件的组代码dataValue(0) = "Line" ' 过滤出 Line 实体gpCode(1) = 1001 ' 设置第二个过滤条件的组代码dataValue(1) = "管道专业扩展数据" ' 过滤出含扩展数据组的应用名的实体groupCode = gpCode ' 设置全部过滤条件的组代码dataCode = dataValue ' 设置全部过滤条件 ' 用条件过滤获得选择集sset.Select 0, Point1, Point2, groupCode, dataCodeIf sset.Count > 0 Then　　Set ent = sset(0) ' 从选择集中取出第一个实体　　Call ent.GetXData("管道专业扩展数据", xdataType, xdataValue)　　MsgBox xdataValue(1) + ": 长度=" + Str(xdataValue(2)) + " 公称直径=" + Str(xdataValue(3))End IfSet objAcad = NothingExit SubError_GetEntity:　　MsgBox Err.Description, 16, "Error: AutoCAD is not running"　　Set objAcad = Nothing　　Exit SubEnd Sub

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