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Resolved Reading 64-bit registry as a 32-bit PB 2019 application

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  1. François Molinas
    François Molinas
  2. PowerBuilder
  3. Thursday, 4 July 2019 15:08 PM UTC

Hello community,

 

My 32-bit PB app needs to check the registry settings for a third party 64-bit application.

This community and the bug tracker both state that PB2017 won't allow me to do it.

Come PB2019... As far as I understand it, the New Features document specifically states that this problem has been addressed. But I still fail to access the non-redirected HKLM\Software registry section.

Here is a barebones demo, to be pasted to an Application Open script:

String	las_std[], las_wow[]
String	ls_tit, ls_msg
Environment	lenv

GetEnvironment(lenv)
ls_tit = String(lenv.ProcessBitness) + " bits - PB version "
ls_tit += String(lenv.PBMajorRevision) + "." + String(lenv.PBMinorRevision) + "." + String(lenv.PBFixesRevision) + "." + String(lenv.PBBuildNumber)

ls_msg = "Key count under HKLM\Software:~r~n"
RegistryKeys("HKEY_LOCAL_MACHINE\SOFTWARE", las_std)
ls_msg += "~r~nStd = " + String(UpperBound(las_std))
RegistryKeys("HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node", las_wow)
ls_msg += "~r~nWoW = " + String(UpperBound(las_wow))

MessageBox(ls_tit, ls_msg)
HALT CLOSE

I compiled this code into 32- and 64-bit apps with PB 2017R2 (build 1858) and PB 2019 (build 2082). 32-bit apps show the same count, and 64-bit apps show differing counts. PB version makes no difference in the numbers shown.

 

Is there an option or a setting I am missing ?

 

Regards,

François

References
  1. https://www.appeon.com/standardsupport/search/view?id=1093
  2. https://community.appeon.com/index.php/qna/q-a/read-64bit-registry-from-32bit-pb-application
  3. https://www.appeon.com/support/documents/appeon_online_help/pb2019/whats_new/ch01s06.html
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Responses (3)
François Molinas
François Molinas Accepted Answer Pending Moderation
  1. Monday, 8 July 2019 09:30 AM UTC
  2. PowerBuilder
  3. # 1

I have read about accessing an alternate view (link below); this would be the 64-bit side of the registry. So this is possible.

But it seems to "lock" the alternate view... Way too risky as my application uses the registry on a regular basis. Plus, what would happen tp PowerBuilder itself when I debug my app?

Appeon advertised a new feature on this very subject. Does anyone have a clue about what has changed?

References
  1. https://docs.microsoft.com/en-us/windows/win32/winprog64/accessing-an-alternate-registry-view
Comment
Roland Smith
  1. Roland Smith
  2. Monday, 8 July 2019 10:26 AM UTC
You would have to use the registry API functions rather than the built in functions.
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Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Thursday, 4 July 2019 15:47 PM UTC
  2. PowerBuilder
  3. # 2

Windows internally redirects registry access so it is not possible to do it from 32bit.

Comment
Olan Knight
  1. Olan Knight
  2. Friday, 5 July 2019 04:31 AM UTC
I learned this the hard way when Windows 10 came out. Suddenly code that was working perfectly failed when the app was running on a 64 bit platform. :/



Olan
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Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Thursday, 4 July 2019 15:18 PM UTC
  2. PowerBuilder
  3. # 3

Hi Francois;

   What I have done before is build a 64bit EXE that deals with the registry. Then call this App from your 32bit App as required.

Food for thought.

Regards ... Chris

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