EnumChildWindows

[Natter]

Hi, all !
Where I can find examples with function API EnumChildWindows() using ? I finded examplest on VB/Delphi/C. But ! can't write it on FWH.

[Antonio Linares]

You can use this code to access all child windows:

Code: Select all  Expand view

#define GW_CHILD      5
#define GW_HWNDNEXT   2

function ProcessChilds( oDlg )

   local hCtrl := GetWindow( oDlg:hWnd, GW_CHILD )

   ... your code ...

   while hCtrl != 0
      hCtrl = GetWindow( hCtrl, GW_HWNDNEXT )
      ... your code ...
   end

return nil


[Natter]

Function GetWindow( hCtrl, GW_HWNDNEXT ) not find MDI windows . For this I to used FindWindowEx. Then I want get handles of controls on this MDI window by function GetWindow, but can't do it. I read that can to use EnumChildWindows for it.

[Antonio Linares]

We are going to implement it

[Natter]

Thank, Antonio ! It's work

[Antonio Linares]

Here you have it:

Code: Select all  Expand view

// (c) FiveTech Software, 2008

#include "FiveWin.ch"

function Main()

   local oDlg

   DEFINE DIALOG oDlg TITLE "Test"

   @ 2, 2 BUTTON "Enum" ;
      ACTION EnumChildWindows( oDlg:hWnd,;
             { | hChild, nLParam | MsgInfo( GetClassName( hChild ) ), .T. },; // .T. means continue
             0 ) // optional supplied value

   @ 2, 8 BUTTON "Another"

   ACTIVATE DIALOG oDlg CENTERED

return nil

#pragma BEGINDUMP

#include <hbapi.h>
#include <hbapiitm.h>
#include <windows.h>

void hb_evalBlock( PHB_ITEM pCodeBlock, ... );

static PHB_ITEM pCodeBlock = NULL;

BOOL CALLBACK static EnumChildProc( HWND hWnd, LPARAM lParam )
{
    PHB_ITEM pHWnd  = hb_itemPutNL( NULL, ( LONG ) hWnd );
    PHB_ITEM pParam = hb_itemPutNL( NULL, ( LONG ) lParam );
   
    if( pCodeBlock )
      hb_evalBlock( pCodeBlock, pHWnd, pParam, 0 );
     
   hb_itemRelease( pHWnd );
   hb_itemRelease( pParam );   
     
   return hb_parl( -1 );      
}   

HB_FUNC( ENUMCHILDWINDOWS )
{
   HWND hWnd = ( HWND ) hb_parnl( 1 );
   LPARAM lParam = ( LPARAM ) hb_parnl( 3 );
   
   pCodeBlock = hb_param( 2, HB_IT_BLOCK );
   hb_retl( EnumChildWindows( hWnd, EnumChildProc, lParam ) );
   pCodeBlock = NULL;
}   

#pragma ENDDUMP