DosQCurDisk

This call determines the current default drive for the requesting process.

DosQCurDisk (DriveNumber, LogicalDriveMap)

• DriveNumber (PUSHORT) - output : Address of the number of the default drive, for example:

Value  Definition'
1      A
2      B
.      .

• LogicalDriveMap (PULONG) - output : Address of the bit map (stored in the low-order portion of the 32-bit, doubleword area) where the system returns the mapping of the logical drives. Logical Drives A to Z have a one-to-one mapping with the bit positions 0 to 25 of the map; for example, bit 0 is drive A, bit 1 is drive B, and so forth. The settings of these bits indicate which drives exist:

Value  Definition
0       The logical drive does not exist.
1       The logical drive exists.

rc (USHORT) - return

Return code description is:

• 0 NO_ERROR

#define INCL_DOSFILEMGR
 
USHORT  rc = DosQCurDisk(DriveNumber, LogicalDriveMap);
PUSHORT DriveNumber;     /* Default drive number (returned) */
PULONG  LogicalDriveMap; /* Drive map area (returned) */
 
USHORT  rc;              /* return code */

EXTRN  DosQCurDisk:FAR
INCL_DOSFILEMGR     EQU 1
 
PUSH@  WORD    DriveNumber     ;Default drive number (returned)
PUSH@  DWORD   LogicalDriveMap ;Drive map area (returned)
CALL   DosQCurDisk

Returns WORD

Text based on http://www.edm2.com/index.php/DosQCurDisk