Inventor VBAでSketchedSymbols.Add()メソッド実行で、正しい引数を渡しているにもかかわらず「プロシージャの呼び出し、または引数が不正です。」エラーが発生する。

[#1]

症状

Inventor VBAでSketchedSymbols.Add()メソッドで正しい引数を渡しているにもかかわらず「プロシージャの呼び出し、または引数が不正です。」エラーが発生する。

再現手順

1．Inventorを起動し、図面ファイルを新規作成します。

2. VBAエディタで以下のコードを実行し、スケッチシンボルを追加します。

Public Sub CreateSketchedSymbolDefinition()
    ' Set a reference to the drawing document.
    ' This assumes a drawing document is active.
    Dim oDrawDoc As DrawingDocument
    Set oDrawDoc = ThisApplication.ActiveDocument

    ' Create the new sketched symbol definition.
    Dim oSketchedSymbolDef As SketchedSymbolDefinition
    Set oSketchedSymbolDef = oDrawDoc.SketchedSymbolDefinitions.Add("Circular Callout")

    ' Open the sketched symbol definition's sketch for edit. This is done by calling the Edit
    ' method of the SketchedSymbolDefinition to obtain a DrawingSketch. This actually creates
    ' a copy of the sketched symbol definition's and opens it for edit.
    Dim oSketch As DrawingSketch
    Call oSketchedSymbolDef.Edit(oSketch)

    Dim oTG As TransientGeometry
    Set oTG = ThisApplication.TransientGeometry

    ' Use the functionality of the sketch to add sketched symbol graphics.
    Dim oSketchLine As SketchLine
    Set oSketchLine = oSketch.SketchLines.AddByTwoPoints(oTG.CreatePoint2d(0, 0), oTG.CreatePoint2d(20, 0))

    Dim oSketchCircle As SketchCircle
    Set oSketchCircle = oSketch.SketchCircles.AddByCenterRadius(oTG.CreatePoint2d(22, 0), 2)

    Call oSketch.GeometricConstraints.AddCoincident(oSketchLine.EndSketchPoint, oSketchCircle)

    ' Make the starting point of the sketch line the insertion point
    oSketchLine.StartSketchPoint.InsertionPoint = True

    ' Add a prompted text field at the center of the sketch circle.
    Dim sText As String
    sText = "<Prompt>Enter text 1</Prompt>"
    Dim oTextBox As TextBox
    Set oTextBox = oSketch.TextBoxes.AddFitted(oTG.CreatePoint2d(22, 0), sText)
    oTextBox.VerticalJustification = kAlignTextMiddle
    oTextBox.HorizontalJustification = kAlignTextCenter

    Call oSketchedSymbolDef.ExitEdit(True)
End Sub

3.作成したスケッチシンボルをシートに追加する以下のコードを実行すると、oSketchedSymbols.Add()の行でエラーが発生します。

Public Sub InsertSketchedSymbolOnSheet()
    ' Set a reference to the drawing document.
    ' This assumes a drawing document is active.
    Dim oDrawDoc As DrawingDocument
    Set oDrawDoc = ThisApplication.ActiveDocument

    ' Obtain a reference to the desired sketched symbol definition.
    Dim oSketchedSymbolDef As SketchedSymbolDefinition
    Set oSketchedSymbolDef = oDrawDoc.SketchedSymbolDefinitions.Item("Circular Callout")

    Dim oSheet As Sheet
    Set oSheet = oDrawDoc.ActiveSheet

    ' This sketched symbol definition contains one prompted string input. An array
    ' must be input that contains the strings for the prompted strings.
    Dim sPromptStrings(0) As String
    sPromptStrings(0) = "A"

    Dim oTG As TransientGeometry
    Set oTG = ThisApplication.TransientGeometry

    ' Add an instance of the sketched symbol definition to the sheet.
    ' Rotate the instance by 45 degrees and scale by .75 when adding.
    ' The symbol will be inserted at (0,0) on the sheet. Since the
    ' start point of the line was marked as the insertion point, the
    ' start point should end up at (0,0).
    Dim oSketchedSymbols As Object
    Set oSketchedSymbols = oSheet.SketchedSymbols
    
    Dim oSketchedSymbol As SketchedSymbol
    Set oSketchedSymbol = oSketchedSymbols.Add(oSketchedSymbolDef, oTG.CreatePoint2d(0, 0), (3.14159 / 4), 0.75, sPromptStrings)
End Sub

原因

上述のスケッチシンボルをシートに追加するコードで、SketchedSymbolsオブジェクトを格納する変数oSketchedSymbolsがObject型で宣言されていることエラーの原因です。

SketchedSymbols.Add()メソッドは、第五引数のオプショナル引数に文字列の配列を指定可能ですがSketchedSymbolsオブジェクトがObject型の変数で宣言されている場合、VBAはこの引数を文字列の配列ではなく、IUnknown型の配列に変換してメソッド呼び出し行います。

このため、指定している引数の型不一致と判断されエラーとなります。

対処法

 以下サンプルコードの様にSketchedSymbolsオブジェクトを格納する変数oSketchedSymbolsを明示的にSketchedSymbols型として宣言をすることで、このエラーは発生しなくなります。

Public Sub InsertSketchedSymbolOnSheet()
    ' Set a reference to the drawing document.
    ' This assumes a drawing document is active.
    Dim oDrawDoc As DrawingDocument
    Set oDrawDoc = ThisApplication.ActiveDocument

    ' Obtain a reference to the desired sketched symbol definition.
    Dim oSketchedSymbolDef As SketchedSymbolDefinition
    Set oSketchedSymbolDef = oDrawDoc.SketchedSymbolDefinitions.Item("Circular Callout")

    Dim oSheet As Sheet
    Set oSheet = oDrawDoc.ActiveSheet

    ' This sketched symbol definition contains one prompted string input. An array
    ' must be input that contains the strings for the prompted strings.
    Dim sPromptStrings(0) As String
    sPromptStrings(0) = "A"

    Dim oTG As TransientGeometry
    Set oTG = ThisApplication.TransientGeometry

    ' Add an instance of the sketched symbol definition to the sheet.
    ' Rotate the instance by 45 degrees and scale by .75 when adding.
    ' The symbol will be inserted at (0,0) on the sheet. Since the
    ' start point of the line was marked as the insertion point, the
    ' start point should end up at (0,0).
    Dim oSketchedSymbols As SketchedSymbols
    Set oSketchedSymbols = oSheet.SketchedSymbols
    
    Dim oSketchedSymbol As SketchedSymbol
    Set oSketchedSymbol = oSketchedSymbols.Add(oSketchedSymbolDef, oTG.CreatePoint2d(0, 0), (3.14159 / 4), 0.75, sPromptStrings)
End Sub

  なお、この現象はメソッドをチェイン実行した場合にも発生します。例えば上記サンプルで以下のようにoSheet変数をObject型として宣言して、oSheet.SketchedSymbols.Add()と実行した場合などです。この場合もoSheetがObject型として宣言されているため以降のメソッド呼び出しが、VBAの実行時バインディング

を用いて呼び出されるため、VBAが第五引数の変数の型をIUnknown型の配列に変換してしまうためです。

Dim oSheet As Object

...

Set oSketchedSymbol = oSheet.SketchedSymbols.Add(oSketchedSymbolDef, oTG.CreatePoint2d(0, 0), (3.14159 / 4), 0.75, sPromptStrings)