[求助]怎样修改cad的扩展数据
图元已经有扩展数据了，想重新修改它怎么处理呢？ <pre class="Code">Sub Example_SetXdata()' This example creates a line and attaches extended data to that line.
' Create the line
Dim lineObj As AcadLine
Dim startPt(0 To 2) As Double, endPt(0 To 2) As Double
startPt(0) = 1#: startPt(1) = 1#: startPt(2) = 0#
endPt(0) = 5#: endPt(1) = 5#: endPt(2) = 0#
Set lineObj = ThisDrawing.ModelSpace.AddLine(startPt, endPt)
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' Initialize all the xdata values. Note that first data in the list should be
' application name and first datatype code should be 1001
Dim DataType(0 To 9) As Integer
Dim Data(0 To 9) As Variant
Dim reals3(0 To 2) As Double
Dim worldPos(0 To 2) As Double
DataType(0) = 1001: Data(0) = "Test_Application"
DataType(1) = 1000: Data(1) = "This is a test for xdata"
DataType(2) = 1003: Data(2) = "0" ' layer
DataType(3) = 1040: Data(3) = 1.23479137438413E+40' real
DataType(4) = 1041: Data(4) = 1237324938 ' distance
DataType(5) = 1070: Data(5) = 32767 ' 16 bit Integer
DataType(6) = 1071: Data(6) = 32767 ' 32 bit Integer
DataType(7) = 1042: Data(7) = 10 ' scaleFactor
reals3(0) = -2.95: reals3(1) = 100: reals3(2) = -20
DataType(8) = 1010: Data(8) = reals3 ' real
worldPos(0) = 4: worldPos(1) = 400.99999999: worldPos(2) = 2.798989
DataType(9) = 1011: Data(9) = worldPos ' world space position
' Attach the xdata to the line
lineObj.SetXData DataType, Data
' Return the xdata for the line
Dim xdataOut As Variant
Dim xtypeOut As Variant
lineObj.GetXData "", xtypeOut, xdataOut
End Sub</pre>
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