Expected type mismatch error

vb6

I'm expecting a ByRef Argument Type Mismatch at compile time but I'm not getting it. It's compiling without errors and failing at runtime with error 13, "Type mismatch".

It's a fairly simple to reproduce.

dim c as Car
Set c = New Car

Sail c

…

Public Sub Sail(ByRef b As Boat)
    ...
End Sub

Car does not inherit from Boat

Is there a setting (or plugin perhaps) that will force VB into a strict compilation mode?

Edit: it looks like there's no compiler option for this. Does anyone know of an addon that analyses the source for these casting issues during a compile?

Best Answer

Is it possible to set Option Strict True in VB6?

Edit: Apparently it is not possible in VB6 (seems to have been introduced with VB 7.0)

Related Solutions

VB6 – ByRef argument type mismatch error – where is it

The problem is here:

Dim FirstLevel, FirstDACtoMeasure As Integer

This actually declares FirstLevel as a Variant and not as an Integer as you might expect.

This is a classic VB6 gotcha! (and you are not the first to be bitten by it).

Declaring a variable per line avoids the problem:

Dim FirstLevel As Integer
Dim FirstDACtoMeasure As Integer

VB6 type mismatch error

It strikes me that there could be an entirely different reason for your Type Mismatch error, especially as you are accessing an object property. I've experienced this error when I have, for some reason, been pointing at a different DLL to that registered. You will find with VB that it registers a DLL "on the fly" when you build it, so you may end up accessing the code somewhere that you did not expect. This may not be the problem in your case, but it is worth exploring.

Best Answer

Related Solutions

VB6 – ByRef argument type mismatch error – where is it

VB6 type mismatch error

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