Question

Use of DLL structure from VBA

Asked by: calacuccia

I am developping VBA interface in Excel 97.
I have a fully documented DLL with 3 child DLL's and some archives which I need to use to call their functions. This is fully documented, no problem.

However, I am facing problems as the main dll, the 3 child dll's and the subarchives need to be located at the program directory.

In VB, the path of the executable will be used by VB to look for the necessary files.

The question is: how to indicate VBA that the path is the one in which the main xls or xla resides?

calacuccia

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Asked On
2002-10-17 at 06:20:16ID20375568
Tags

dll

,

vba

,

structure

Topic

Visual Basic Programming

Participating Experts
2
Points
100
Comments
7

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Answers

 

by: AzraSoundPosted on 2002-10-17 at 07:39:03ID: 7341282

You may try manually setting the current working path prior to calling the dll, since the working path is one in which the Windows should automatically search for the dll in.  Example:


Dim strOldWorkingPath As String


'save current directory
strOldWorkingPath = CurDir$

'change to location of application/executable/dll
'(example - a subfolder called "support" where dlls are located)
ChDir Application.Path & "support"

'call your dll function
Call MyDLLFunction(Parameters)

'return to previous working directory
ChDir strOldWorkingPath

 

by: calacucciaPosted on 2002-10-17 at 07:43:41ID: 7341310

Azra,

It was as simple as

ChDir ThisWorkbook.Path

I owe you ;-)

Let me play with this a little more, and 100 pts x A is yours.

calacuccia

 

by: AzraSoundPosted on 2002-10-17 at 08:15:32ID: 7341442

I do recommend changing the current working directory back to its original path after calling the dll function, as it may play a role in other issues that are used to defaulting to this path in order to function correctly.

 

by: calacucciaPosted on 2002-10-17 at 08:20:53ID: 7341464

It is indeed better, as users of the program will not like having their default Excel directory changed to the Add-In directory, so I am doing what you suggested.

 

by: calacucciaPosted on 2002-10-17 at 10:48:31ID: 7341577

Thanks again, Azra.

So easy, but never thought of trying the ChDir function.

Cheers
calacuccia

 

by: AzraSoundPosted on 2002-10-17 at 11:14:27ID: 7341705

No problem...glad we got this resolved.   :-)

 

by: bruintjePosted on 2002-10-20 at 10:10:31ID: 7349850

good to see this closed indeed :)

cal you're needed here > http://www.experts-exchange.com/Applications/MS_Office/Q_20377551.html

20120131-EE-VQP-002

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