OSR's ntdev List: Boot device dos name

Message 1 of 4

20 Aug 12 12:41

Dhaval Vasu

xxxxxx@hotmail.com

Join Date: 25 Sep 2011

Posts To This List: 34

Boot device dos name

How to get boot device dos name in windows xp, vista+? I need boot device, not windows or system. In application, not a driver. Dos name like C:\ , so I could use win api to access files. Any help appreciated.

Message 2 of 4

20 Aug 12 15:00

Alex Grig

xxxxxx@broadcom.com

Join Date: 14 Apr 2008

Posts To This List: 1866

RE: Boot device dos name

SystemDrive environment variable

Message 3 of 4

20 Aug 12 15:45

raj r

xxxxxx@gmail.com

Join Date: 20 Jul 2006

Posts To This List: 240

Re: Boot device dos name

On 8/20/12, xxxxx@hotmail.com <xxxxx@hotmail.com> wrote: > How to get boot device dos name in windows xp, vista+? > I need boot device, not windows or system. In application, not a driver. > Dos name like C:\ , so I could use win api to access files. > > Any help appreciated. F:\>echo %systemdrive% C: F:\> %SystemDrive% The %SystemDrive% variable is a special system-wide environment variable found on Microsoft Windows NT and its derivatives. Its value is the drive upon which the system folder was placed. Also see next item. The value of %SystemDrive% is in most cases C:. http://en.wikipedia.org/wiki/Environment_variable // getenv.cpp : Defines the entry point for the console application. // #include "stdafx.h" int _tmain(int argc, _TCHAR* argv[]) { size_t Result; _TCHAR* Buffer; printf( "lets get the boot device dos name and print it to screen\n" ); if ( ( Result = GetEnvironmentVariable( L"SystemDrive", NULL, 0 )) != 0 ) { Buffer = (_TCHAR*) malloc( Result+10 ); if ( ( Result = GetEnvironmentVariable( L"SystemDrive", Buffer, Result+10 ) ) != 0 ) { printf( "Boot Device Dos Name Is %s\n",Buffer ); free( Buffer ); ExitProcess ( 0x500d ); } } printf( "Environment Variable %%SystemDrive%% Not Available\n" ); ExitProcess ( 0xe5505 ); return 0; }

Message 4 of 4

21 Aug 12 04:33

Dhaval Vasu

xxxxxx@hotmail.com

Join Date: 25 Sep 2011

Posts To This List: 34

RE: Boot device dos name

Thanks sir! What about if there are more than one OS installed. System driver depends on what operating system is loaded, but not partition table configuration. I need to read boot.ini file. In windows XP when you open system properties, then boot parameters window, you can see default operating system which is loaded. Windows reads partition table, convert partition number to device name like C:\ and reads file. Same will work for vista+ for bcd storage.

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