>>On documentation:
>>
>>SYS(2325) - WCLIENTWINDOW from Visual FoxPro WHANDLE
>>
>>
>>SYS(2325) returns the hWnd (Window Handle) for a client window (WCLIENTWINDOW) of a specified Visual FoxPro parent window.
>>nWHANDLE is returned if nWHANDLE is valid but there is no WCLIENTWINDOW.
>> 0 is returned if nWHANDLE is invalid.
>>
>>
>>Therefore this function returns a Natural(31) that can mean two different things.
>>Then the function return a ambiguous value.
>>If it returns to me a positive integer, is it a nWHANDLE or a hWnd ?
>>Example:
>>

>>returnValue=SYS(2325,SYS(2326, m.Thisform.Hwnd))
>>DO CASE
>>  CASE m.returnValue=0
>>       * ERROR
>>  CASE && i cannot write something here.
>>* I must compare it with nWHANDLE ?
>>* Is it sure that a nWHANDLE it cannot match with a HWnd? No, It does not have it are it.
>>* CASE m.returnValue=SYS(2326, m.Thisform.Hwnd)
>>     returnValue=m.Thisform.Hwnd
>>*
>>

>>
>>Expected definition:
>>
>>SYS(2325) returns the hWnd (Window Handle) for a client window (WCLIENTWINDOW) of a specified Visual FoxPro parent window.
>>hWnd of nWHANDLE is returned if nWHANDLE is valid but there is no WCLIENTWINDOW.
>> 0 is returned if nWHANDLE is invalid. ( I wish NULL, but 0 is not a drama )
>>
>>
>>With this i'm sure that the value is a Hwnd, and i use it without ambiguity.
>>
>Fabio,
>
>A whandle and an hWnd are two entirely different things. The whandle is a value that VFP assigns internally to its windows. An hWnd is a value that the OS assigns to a window. VFP uses the whandle value to internally manage its forms.
>
>AFAIK, you have to use the Foxtools.fll library to get a whandle. It has functions such as _WMainWind() and _WFindTitl() that return the whandle.


Hi George, read VFP9 documentation please.