I am trying to register a type library programatically from VBA code, using two variants of a technique found using Google (Subs RegisterTypeLibrary and RegisterTypeLibrary2 below).
The code below crashes with an access violation on the call to LoadTypeLib / LoadTypeLibEx. What am I doing wrong? In case it's relevant, the type library is a TLB file generated from a .NET assembly using tlbexp.
Private Enum RegKind
RegKind_Default = 0
RegKind_Register = 1
RegKind_None = 2
End Enum
Private Declare Function LoadTypeLibEx Lib "oleaut32.dll" ( _
pFileName As Byte, ByVal RegKind As RegKind, pptlib As Object) As Long
Private Declare Function LoadTypeLib Lib "oleaut32.dll" ( _
pFileName As Byte, pptlib As Object) As Long
Private Declare Function RegisterTypeLib Lib "oleaut32.dll" ( _
ByVal ptlib As Object, szFullPath As Byte, _
szHelpFile As Byte) As Long
Private Sub RegisterTypeLibrary(FileName As String)
Dim abNullTerminatedFileName() As Byte
Dim objTypeLib As Object
Dim lHResult As Long
abNullTerminatedFileName = FileName & vbNullChar
lHResult = LoadTypeLib(abNullTerminatedFileName(0), objTypeLib)
If lHResult <> 0 Then
Err.Raise lHResult, "LoadTypeLib", "Error registering type library " & FileName
End If
lHResult = RegisterTypeLib(objTypeLib, abNullTerminatedFileName(0), 0)
If lHResult <> 0 Then
Err.Raise lHResult, "RegisterTypeLib", "Error registering type library " & FileName
End If
Exit Sub
End Sub
Private Sub RegisterTypeLibrary2(FileName As String)
Dim abNullTerminatedFileName() As Byte
Dim objTypeLib As Object
Dim lHResult As Long
abNullTerminatedFileName = FileName & vbNullChar
lHResult = LoadTypeLibEx(abNullTerminatedFileName(0), ByVal RegKind_Register, objTypeLib)
If lHResult <> 0 Then
Err.Raise lHResult, "LoadTypeLibEx", "Error registering type library " & FileName
End If
End Sub
EDIT
I suspect it is something specific about my type library. I've found a solution which I've posted as an answer below.