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Resolved is FindWindowA not supported on PB2022.

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  1. Subrat patra
    Subrat patra
  2. PowerBuilder
  3. Thursday, 11 January 2024 13:28 PM UTC

Hi All,

In our application we are using FindWindowA() function which is correctly working on PB2019. When I migrate it into PB2022, looks like this is not working.

Do I need to change anything to work on PB2022 version?

 

 

 

We have not done any changes to the code, just migrated to PB2022. 

Please help.

 

Regards

Subrat

 

 

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Accepted Answer
Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Friday, 12 January 2024 15:07 PM UTC
  2. PowerBuilder
  3. # Permalink

HI Subrat;

  FYI: These are the External Declarations that I use in my STD Framework for a FindWindow call ...

  • FUNCTION uLong FindWindow ( ref String classname, ref string windowname ) Library "USER32.DLL" ALIAS FOR "FindWindowW"
  • FUNCTION uLong FindWindowEx ( uLong hwnd, uLong childAfter, ref string classname, ref string windowname ) LIBRARY "USER32.dll"  ALIAS FOR "FindWindowExW"
  • FUNCTION uLong FindWindowEx ( uLong hwnd, uLong childAfter, long classname, ref string windowname )  LIBRARY "USER32.dll"  ALIAS FOR "FindWindowExW"
  • FUNCTION uLong FindWindowEx ( uLong hwnd, uLong childAfter, ref string classname, long windowname )  LIBRARY "USER32.dll"  ALIAS FOR "FindWindowExW"

   FWIW: The above SDK calls are all working perfectly in both 32 bit and 64 bit Apps built from the framework.

   Note: When you call the FindWindow SDK though, you need to nullify the ClassName. For example:

String   ls_class                     // Windows Class Name
LongPtr  lp_handle                    // Window's "handle"
    
SetNull (ls_class)                    // Set Class 2 NULL (all)
lp_handle = THIS.FindWindow ( ls_class, as_title )             // Try to locate it!
If  lp_handle = 0 THEN                                         // Found?
    lp_handle = THIS.FindWindowEx (0, 0, ls_class, as_title )    // NO=>Try Extended search!
END IF

The above example is actual code from the STD framework.  HTH

Regards ... Chris

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Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Thursday, 11 January 2024 14:22 PM UTC
  2. PowerBuilder
  3. # 1

The arguments should not be defined as by reference, see the documentation:

https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-findwindoww

I would do it like this:

Function longptr FindWindow ( string lpClassName, string lpWindowName ) Library "user32.dll" Alias For "FindWindowW"

 

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Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Thursday, 11 January 2024 13:41 PM UTC
  2. PowerBuilder
  3. # 2

Hi Subrat;

  Your Apps should not be using any old ANSI SDK calls for a long time now that PB is Unicode.

  In your case, change the SDK call to use a FindWindowW() call instead. HTH

Regards ... Chris 

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Subrat patra
Subrat patra Accepted Answer Pending Moderation
  1. Friday, 12 January 2024 10:50 AM UTC
  2. PowerBuilder
  3. # 3

Hi Roland,

I have changed to use FINDWINDOWA() , but no luck. I am not sure why the same code is working on PB2019, now after migrating this to PB2022, its not working. Is this windowname and classname are registered somewhere ? Can I see those?

 

Regards

Subrat

 

Comment
Roland Smith
  1. Roland Smith
  2. Friday, 12 January 2024 15:15 PM UTC
Change ClassName to longptr and pass zero. The classname for windows probably changed between PB versions.
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Subrat patra
Subrat patra Accepted Answer Pending Moderation
  1. Friday, 12 January 2024 11:01 AM UTC
  2. PowerBuilder
  3. # 4

Hi Chris,

 

I have changed the logic but no luck.

Is this windowname and classname registered somewhere ? I need to check how it stored in Pb2019 and PB2022.

 

Regards

Subrat

 

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Andreas Mykonios
  1. Andreas Mykonios
  2. Friday, 12 January 2024 11:52 AM UTC
Have you tried to call GetLastError to see if any error occuered?

Andreas.
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Andreas Mykonios
  1. Andreas Mykonios
  2. Friday, 12 January 2024 12:05 PM UTC
By the way, in PB's help, while looking at handle method, FindWindowW is declared as: FUNCTION unsignedlong FindWindow (long classname, string windowname) LIBRARY "user32.dll" ALIAS FOR FindWindowW (https://docs.appeon.com/pb2022r3/powerscript_reference/handle_func.html).

Andreas.
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Subrat patra
Subrat patra Accepted Answer Pending Moderation
  1. Friday, 12 January 2024 18:45 PM UTC
  2. PowerBuilder
  3. # 5

Thanks a lot. I set the classname as null and it worked. Thanks a lot.

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Chris Pollach @Appeon
  1. Chris Pollach @Appeon
  2. Friday, 12 January 2024 20:26 PM UTC
HI Subrat;

That is "awesome" news .. thanks for the update! :-)

Yes, that NULL is an important setting. I found that out over 5+ years ago when I first started to support W10.

Regards ... Chris
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