Extended window flag

[Andreas Mohr]

Hi,

On Mon, Dec 15, 2003 at 02:32:39PM +0100, Fabian Cenedese wrote:
> 
> >>I have an application where I get the styles from a window with
> >>
> >>GetWindowLong(m_hWnd, GWL_EXSTYLE);
> >>
> >>In Windows I get 0x00000110 but in wine I get 0x40000110. From the wine
> >>headers (mine seem to old) I get this means 'managed by the system'. Is
> >>this something wine specific? Do I need to pay attention to this? If it's
> >>a valid Windows flag why isn't it set in Windows? If it's just wine specific
> >>can I just mask it out?
> >
> >Ok, I should look closer at the source :) It's wine internal. Am I on the safe
> >side if I mask the upper flags (0x4..., 0x8...) out?
> 
> Three is the number, now I finally come to the reason of my questions :)
> 
> In our application we have a streaming mechanism where we save all info
> about a window (title, size, position, styles...) so upon loading we can
> recreate it exactly as it was before. On Windows I get some styles
> back, save them and can use them to create the window with
> 
> CreateWnd(Text, ExtStyle, Style, WndRect, MinPos, Parent);
> 
> On wine the extended styles are different as described above. If I now
> try to create a window with these different flags it fails for both Windows
> and wine. But it works if I mask them out.
> 
> As these flags are only wine internal I don't know if it's right to give
> them to the user. On the other hand (if this is needed/usefull) wine should
> be capable of disregarding them if they are given to the CreateWnd
> function. As it is now I need to change my application for wine (which
> I did to continue work) but that shouldn't be desirable.
I'd say internal Wine flags should definitely get masked out.
And NOT by your external program, but by Wine itself (since it needs to be
as compatible with Windows as possible).

Whatever workaround you come up with in your program to make it
Wine-compatible, rest assured that in > 95% of all cases it's a bad idea:
we really need to get Wine fixed instead.

Feel free to submit a patch correcting GetWindowLong and similar functions.

Greetings,

Andreas Mohr