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Call 32-bit COM Objects from 64-bit Domino

Posted on June 28, 2019 by Karl-Henry Martinsson Posted in #DominoForever, AppDev, IBM/Lotus, Microsoft, Notes/Domino, Programming 2 Comments

We all know that when you upgrade your Domino environment from 32-bit to 64-bit, any COM objects you use will not work anymore. You thn need to get and install a 64-bit version of the COM object.

But what if there is no 64-bit version? Do you have to stay on 32-bit Domino forever? Or rather, stay on Domino 9.x, since Domino 10 (and probably also the upcoming version 11) are 64-bit only.

Perhaps not. I found this article that describes how to use a 32-bit COM object in a 64-bit environment, like Domino 10. I have not had time to test it myself, but I will probably try it this weekend.

Read all the details at https://techtalk.gfi.com/32bit-object-64bit-environment/.

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2 thoughts on “Call 32-bit COM Objects from 64-bit Domino”

  1. Brendan Long says:
    July 1, 2019 at 01:09

    Thanks for posting this – I’m keen to find out how it went for you. I have a similar situation with a Domino server that I’m loathe to upgrade due to a dependency on a 32-bit library that is used heavily by an important application, and it’s starting to get a little bit too far down the legacy path as time goes on.

    Reply
  2. Chris says:
    July 1, 2019 at 19:22

    We had that situation and used that solution quite successfully. In our case we had the same COM object installed on most of our Domino servers so I created a REG file that we just ran on each server.

    See code below. Just change the Xs to your own specific CSLID

    ==========

    Windows Registry Editor Version 5.00

    [HKEY_CLASSES_ROOT\Wow6432Node\CLSID\{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}]
    “AppID”=”{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}]”

    [HKEY_CLASSES_ROOT\Wow6432Node\AppID\{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}]]
    “DllSurrogate”=””

    [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}]]
    “DllSurrogate”=””

    ==========

    Reply

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