I have a program, developed in VB6

[Ken01]

I have a program, developed in VB6 on Windows XP, which extensively uses the Compute.Eval method to perform calculations
based on inputted text (e.g x*Sin(X), Log(X) etc). However when moved on to a Windows 7 environment the program no longer works,
except when the compute statement is removed. Have you any ideas?

 

[strongm]

Have to say that I'm not completely sure what Compute.Eval is. Don't recognise it as a Vb6 method

 

[mintjulep]

Eval methods are generally recognized as a security risk, because they allow execution of arbitrary text.

This thread (that strongm participated in 18 years ago)

https://www.tek-tips.com/viewthread.cfm?qid=1189194

suggests that it's actually an Access object, requiring a reference to MS Access Object Library.

 

[strongm]

Oh, I am familiar with VBscript's Eval method. It is Compute.Eval that I am questioning.

It may well be that Compute is an instance of Vbscript, but just need to check

 

[DjangMan]

I do have to say that I appreciate that the OP's question asks about moving a program written on an OS released 23 years ago to an OS released 15 years ago.

 

[DjangMan]

There is, apparently, a VB6 only version of an expression evaluator that has been discontinued but the page says that you can contact them if you need it.

https://www.aivosto.com/eval.html

 

[Ken01]

I have found I can get round the problem by making the changes on the XP laptop and transferring the
exe file over to the W7 PC. The same approach also works for W10.

Thank you to those who wrote a reply.