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[win32lib] subclassing Combo's EditText

• Posted by Martin Stachon <martin.stachon at worldonline.cz> Jul 13, 2002
• 477 views

I need to set some handlers for EditText field of ComboBox.
I tried to subclass it according to this example from Microsoft:

<c code>
    /* Get the edit window handle for each combo box. */ 
    pt.x = 1; 
    pt.y = 1; 

    hwndEdit1 = ChildWindowFromPoint(hwndCombo1, pt); 
    hwndEdit2 = ChildWindowFromPoint(hwndCombo2, pt); 
 
    /* 
    * Change the window procedure for both edit windows 
    * to the subclass procedure. 
    */ 
 
    lpfnEditWndProc = (WNDPROC) SetWindowLong(hwndEdit1, 
        GWL_WNDPROC, (DWORD) SubClassProc); 
 
    SetWindowLong(hwndEdit2, GWL_WNDPROC, 
        (DWORD) SubClassProc);
</c code>

<eu code>
 -- subclass the edit control
 pt = acquire_mem( 0, SIZEOF_POINT )
 store(pt, ptX, 1) -- also tried [5,5];[10,10] etc.
 store(pt, ptY, 1)
 pComboBoxEdit = w32Func(ChildWindowFromPoint, {getHandle(pComboBox), pt})
 ? pComboBoxEdit
 release_mem(pt)
 pComboBoxEdit = subClassControl( {EditText, pWin}, pComboBoxEdit)
 ? pComboBoxEdit
</eu code>

But the output is:
0
0
- this means that ChildWindowFromPoint failed. What I am doing wrong
or is there another way to get handle of the EditText?

Regards,
      Martin Stachon

martin.stachon at tiscali.cz
http://www.webpark.cz/stachon