Re: NtCreateFile and STATUS_OBJECT_PATH_NOT_FOUND (0x0000003A)

On Sun, 1 Aug 2004 00:33:17 -0700, Myria <[email protected]>  
wrote:
> The constant is known by M$ as ObDosDevices (from NT DDK stuff), but 
> since you probably don't have that definition, use#define ObDosDevices  
> ((HANDLE) 0xFFFFFFFD).

Ahhh, the penny drops!  I saw this when I was reading through the xbeboot  
headers, but googling didn't give me any more info about what it meant -  
thanks for the explanation.

> The RootDirectory member of the OBJECT_ATTRIBUTES structure given to
> NtCreateFile is the handle to the directory inside which you want to  
> open a file.  Normally you use NULL for this parameter - NULL meansstart  
> at the root.  However, if you use ObDosDevices for this parameter 
> instead, you will already be inside \??, so you could pass C:\BLAH.TXT 
> directly as the filename, which might motivate you to create symbolic 
> links for this purpose.

Neato.  That should cover the fully qualified DOS-style paths.  I just  
need to make sure I handle filenames without the qualifying drive letter  
and those that depend on the notion of current partition/directory (eg.  
"\xxx\blah.txt" and "blah.txt").  I might see if I can determine which  
partition/directory my XBE was launched from, and then set the current  
partition/directory based on that.  Otherwise, I will just default it to  
C:\ or D:\ (or something).

If I can impose further with one more question - I have noticed that, in  
addition to "\Device\CdRom0", the cdrom can be referenced as  
"\\.\GLOBALROOT\Device\CdRom0".  I am a bit confused as to the nature of  
GLOBALROOT.  Is there any significance to the GLOBALROOT identifier, and  
are there any other devices that hang off it that I need to worry about??

Again, many thanks for the detailed explanations.  It makes so much more  
sense now...

--
Craig Edwards


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