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Expresion too complex error in VB6

Posted on 2008-10-17
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Last Modified: 2013-11-26
Hi all,

I have an aplication written in VB6 that in which I'm testing a linear equations solver implemented in a standard DLL in C. If I run the code not using the DLL (using the traditional solver in VB) the code runs well, but if I use the DLL, the software returns an "Expression too complex" error, interestingly enough, on another completely different part of the code. The C DLL is a straight translation from the original code, and, to add a little fun, this happens on one PC but nor in another, both using exactly the same version of VB (down to the service pack), Windows, and solver DLL. Have anybody seen anything like this?

Best regards


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Question by:interfaces
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Expert Comment

by:mirzas
ID: 22740993
Is the OS same on both machines?

What about regional settings?

You'd be surprised.
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Expert Comment

by:Jaime Olivares
ID: 22741003
>> but if I use the DLL, the software returns an "Expression too complex" error
is this a runtime error? or at compile time when you try to build the DLL?
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Author Comment

by:interfaces
ID: 22743340
Hi Jaime,

It's a runtime error.

Cheers,

Miguel
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Author Comment

by:interfaces
ID: 22743352
Hello mirzas,

Regional settings, and OS versions are the same.

Regards,

Miguel
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Expert Comment

by:mirzas
ID: 22755889
Here is a quote from the VB reference:


Visual Basic Reference: Error Messages
Expression too complex

A floating-point expression contains too many nested subexpressions.
To correct this error

    * Break the expression into as many separate expressions as necessary to prevent the error from occurring.


Now as for the different behavior on different machines.. there MUST be something that IS different between them.
Since you're using VB I do not see how hardware differences could cause this problem.
So it must be the software.
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Author Comment

by:interfaces
ID: 22759741
I was finally able to narrow the problem a bit. It seems that the calculation code (VB) is consuming too many resources. If I let the program run without doing anything else, It carries on ok, but If I try to do something else, the "Expression too complex" error occurs. On one PC the error happens under these circumstances, but on the other it happens every time. I guess I'll have to re-write all the equations in a more step-by-step mode, and see If i can get rid of the error.
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Accepted Solution

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interfaces earned 0 total points
ID: 22797995
Well, I found the problem

The function in the DLL was declared as returning a float value, but in the VB6 Client app, it was declared as a Sub. Changing the declaration in the DLL to void solved the problem.
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