32 vs. 64 bit DLL

I have an Excel spreadsheet which access a 32 bit DLL to access external data. This DLL resides in the same directory as the spreadsheet on a network location.

The users have asked me to make this spreadsheet compatible (be useable) from both their 32 and 64 bit versions of Excel. There is a 64 bit version of the DLL available with exactly the same name as the 32 bit version.

How do I make this work?
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leonstrykerAsked:
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pcelbaConnect With a Mentor Commented:
So if the Excel does not support path in dll name:
Public Declare PtrSafe Function TentenNewHandle Lib "YOURSUBFOLDER\lib1010vbasdk.dll" () As Long

then you can rename one DLL:

Public Declare PtrSafe Function TentenNewHandle Lib "lib1010vbasdk_64.dll" () As Long
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gowflowConnect With a Mentor Commented:
I guess you would rename the 32 bit version to .old and put the 64 there as presume 64 supports 32 and 64  !!! but u need to try that first.
gowflow
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leonstrykerAuthor Commented:
No, the 64 bit version does not work with 32 bit Excel. I guess that is why they sent me both .
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gowflowCommented:
ok at this point I do not see what is happening in Excel and why you need a dll. Can you brief me more in details why is it that you need this dll and how you go about accessing it ? I am intrigued at this point as with all my knowledge of Excel this is the first time I see this kind of request.
gowflow
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pcelbaCommented:
Create two subfolders (e.g. DLL32 and DLL64) and place appropriate DLLs into these subfolders. The spreadsheet then has to decide which one to use so check the OS version and then Excel version.

How to retrieve OS version:
http://www.mrexcel.com/forum/excel-questions/665816-excel-visual-basic-applications-get-version-os-computer.html

How to retrieve Excel version (derived by used VBA version):
http://msdn.microsoft.com/en-us/library/office/ff700513(v=office.11).aspx
(so you don't need OS version in fact...)
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leonstrykerAuthor Commented:
The DLL is created and given to us by 1010Data (http://www.1010data.com/). 1010Data basically maintains a none relational database which can be used, maintained, and queried by the client (us). It can store a truly humongous amount of data. With the DLL we can query our data and benefit from their compression and querying functionality.

To access the DLL there are a bunch of Declarations such as:

Public Declare PtrSafe Sub TentenGetAPIVersion Lib "lib1010vbasdk.dll" (ByRef apiversion As String)
Public Declare PtrSafe Function TentenNewHandle Lib "lib1010vbasdk.dll" () As Long

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Public Declare PtrSafe Sub TentenGetAPIVersion Lib "lib1010vbasdk.dll" (ByRef apiversion As String)
Public Declare PtrSafe Function TentenNewHandle Lib "lib1010vbasdk.dll" () As Long
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leonstrykerAuthor Commented:
I know how to check the Excel version, but how do I point Excel to a different DLL folder?
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gowflowCommented:
Intersting ... but out of my league. :)
gowflow
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leonstrykerAuthor Commented:
Renaming the DLLs actually works, so I am able to place both DLLs in the same directory and I have tested both DLLs from different versions of Excel.

The only issue I have at the moment is that Conditional Compilation, that is:

#If VBA7

is not working. Both versions seem to return nothing and the declarations are not branched.
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Martin LissOlder than dirtCommented:
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leonstrykerAuthor Commented:
My follow up question is here http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Office/Excel/Q_28316039.html

Please post there so we can continue the discussion.
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