Código genérico corregido para ActiveX

Artículo original: ActiveX generic fix
http://www.foxpert.com/knowlbits_200804_1.htm
Autor: Christof Wollenhaupt
Traducido por: Ana María Bisbé York

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Después de leer mi artículo ActiveFiX que trataba sobre la no respuesta de controles ActiveX, Carlos Alloatti llegó a una solución genérica del problema:

*!* Habilitar ventanas de controles ActiveX 

#Define GW_CHILD 5
#Define GW_HWNDNEXT 2

Declare Integer GetWindow In win32api As apiGetWindow ;
  Integer nhWnd, ;
  Integer uCmd

Declare Integer RealGetWindowClass In win32api ;
  As apiRealGetWindowClass ;
  Integer nhWnd, ;
  String @pszType, ;
  Integer cchType

Declare Integer EnableWindow In win32api As apiEnableWindow ;
  Integer nhWnd, ;
  Integer bEnable

Local ;
  m.lnChildHWnd As Integer, ;
  m.lnCmd As Integer, ;
  m.lnEnable As Integer, ;
  m.lcClassName As String, ;
  m.lnBufferLen As Integer

*!* Para probar, cambie  m.lnEnable a 0 
*!* para inhabilitar las ventanas OleControl 
m.lnEnable = 1

If Thisform.ShowWindow = 2 Or Thisform.ScrollBars > 0 Then
  m.lnChildHWnd = apiGetWindow(Thisform.HWnd, GW_CHILD)
Else
  m.lnChildHWnd = Thisform.HWnd
Endif

m.lnCmd = GW_CHILD

Do While .T.
  m.lnChildHWnd = apiGetWindow(m.lnChildHWnd, m.lnCmd)

  If m.lnChildHWnd = 0 Then
    Exit
  Endif

  m.lcClassName = Space(254)
  m.lnBufferLen = apiRealGetWindowClass(m.lnChildHWnd, ;
    @m.lcClassName, Len(m.lcClassName))
    m.lcClassName = Left(m.lcClassName , m.lnBufferLen)

  If m.lcClassName == "CtlFrameWork_ReflectWindow" Then
    apiEnableWindow(m.lnChildHWnd, m.lnEnable)
  Endif

  m.lnCmd = GW_HWNDNEXT
Enddo

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