net: Convert to Unicode. (take 2)

Francois Gouget fgouget at
Wed Aug 3 12:05:57 CDT 2011

On Wed, 3 Aug 2011, Francois Gouget wrote:
> I sort of modeled this after ipconfig's ipconfig_vprintfW() function. 
> However that function has a WriteFile() fallback in case WriteConsole() 
> fails. But I don't see what's the point of this or when using 
> WriteFile() instead of WriteConsole() would work. So I'm hoping someone 
> can enlighten me as I see no reason for these two tools to handle things 
> so differently. But in any case I see this as being the subject of a 
> separate patch so I think this one can go in.

So I think I figured that part out. If I write a simple test application 
that just does a WriteConsoleW() call and run it on Windows XP SP3, I 
get the following:

 * foo.exe
    -> Works.

 * foo.exe >foo.txt
   -> WriteConsoleW() fails, foo.txt is empty.

 * foo.exe | more
   -> WriteConsoleW() fails, the message is lost.

So ipconfig must have been written so that it works on Windows even 
if its output is redirected. In Wine applications don't need to fall 
back to WriteFile() because 
that's already done by WriteConsoleW().

So the question is: Do we care if these applications don't work right on 
Windows if their output is redirected?

Or from a different point of view: Should these applications take 
advantage of this Wine-specific behavior or stick to the letter of the 

(Similarly Wine's WriteConsole() will accept a NULL 
lpNumberOfCharsWritten parameter, not Windows (up to XP SP3 at least). 
So if we decide our apps are Wine-only, then we could get rid of these 
annoying 'count' variables.)

Francois Gouget <fgouget at>    
                  Hiroshima '45 - Czernobyl '86 - Windows '95

More information about the wine-devel mailing list