Conversion from string to type Integer is not valid

[Musashi84]

So I have a VBA sub that assigns a variable to a drawing directly by its name. Trying to do the same thing in VB.NET however, it goes to an error like "Conversion from string to type Integer is not valid". Here is the code in vb.net, I have a opened autocad file named "Drawing3.dwg") and the error comes up in the last row.

 

        Dim acad As AcadApplication

        Dim drwg As AcadDocument

        acad = GetObject(, "AutoCAD.Application")
        drwg = acad.Documents("Drawing3.dwg")

 

If I use this instead, it goes trough with no issues:

 

        drwg = acad.Documents(0)

 

Now, in VBA you could either put an integer or a string with the name of the drawing in the parenthesis and it would work, in VB.NET only works with integer it looks like. I was wondering if there is another way around it without having to loop through all opened drawings and have it check the names.

 

Thanks a lot!

 

 

[CyberAngel]

See this post on the Autodesk .NET forums. If I'm reading it correctly, in .NET you can use COM, which uses either early binding or late binding. I guess you've inadvertently used early binding.

 

Here's another article that uses API instead of COM. You may want to go that route if you haven't gotten locked into COM.

 

If none of that helps, give us more information about your issue.

 

Welcome to the forum!

[Musashi84]

Hey CyberAngel, thanks for the response, im sorry to get back to it only now. I was able to solve this issue with late binding, like the following code:

 

        Dim acad As Object

        Dim drwg As AcadDocument

        acad = GetObject(, "AutoCAD.Application")
        drwg = acad.Documents("Drawing3.dwg")

 

I am using COM references (assemblies), this stand alone app does AutoCAD, Excel and Word stuff all in the same code.

 

I read that early binding is better for runtime performance in general, so im only using late binding for declaration of 'acad' and not for the rest of the variables. Should I use it in all of the variables or only the ones that give me this exception? Im guessing that this issue is related to AutoCAD only, since Excel and Word did not give me any trouble.

 

 

Thanks a lot.

 

 

 

 

 

 

 

 

 

 

 

[Danielm103]

I don’t see in the API where Documents takes an int argument

Possibly Documents. Item(index)

 

https://help.autodesk.com/view/ACD/2024/ENU/?guid=GUID-2C8C8291-16C9-4A9F-8399-58D5DE4B9589

Edited April 5 by Danielm103