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Resolved WindowFromPoint in 64Bit application
  1. Issue
  2.  64-bit
  3.  API
  4.  DLL
0 Votes
  1. Mayller Lopez
  2. PowerBuilder
  3. Thursday, 17 December 2020 03:35 AM UTC

Hi,

I have an application which running smoothly in 32bit, but my client now requested it make it as 64bit. So i've gone thru migration from PB12.1 to PB12.6 B4138. Now I have a problem with one windows API (WindowFromPoint) it doesnt return proper handle in 64bit exe, but if I run the source which is in 32bit its working properly.

Function is declared from uo, as no matter what data type i use to declare, longptr, long or ulong still doesnt return correct value. Btw longptr it just return 0

Function longlong WindowFromPoint(long xx, long yy) library "User32.dll"

my uo which is calling the ext funtion instance declared as:

longlong  hWnd, hPic, hLab

contructor event:

hWnd = Long(Handle(This))
hPic = Long(Handle(Glyph))
hLab = Long(Handle(Label))

this function (iswithin - bool) always returns false as ll_hnd and hWnd didnt match, while in 32bit it always match and working properly.

longlong ll_hnd
POINT lpPoint

Externs.GetCursorPos(lpPoint)
ll_hnd = Externs.WindowFromPoint(lpPoint.X, lpPoint.Y)

Return  (ll_hnd = hWnd Or ll_hnd = hPic Or ll_hnd = hLab) And IsParentActive()

The iswithin function is called from mousemove event:

IF ObjectAtPoint <> This AND IsValid(ObjectAtPoint) THEN ObjectAtPoint.TriggerEvent("MouseLeave")

IF IsWithin() THEN
    ObjectAtPoint = This

    SetTimer(hWnd, 1, 1, 0)
    IF FDown THEN
        If Globals.ib_new_ui Then
            
            If FCaptured Then StickyHighlight(cPressed) Else StickyHighlight(cHover)
        Else
            
            StickyHighlight(cBtnFace)
        End If
        //IF FCaptured THEN Lower(2)
    ELSEIF FCaptured THEN
        
        Lower(1)
    ELSE
        Raise()

    END IF
    ShowHint()
END IF

When iswithin return false, the button that supposed to be clickable is just like disabled. What could be wrong with this api WindowFromPoint?

This is the only api that is blocking my application and we cannot use it.

Thanks,

Mayller

 

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