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DosDevConfig
This call gets information about attached devices.
Syntax
DosDevConfig (DeviceInfo, Item, Parm)
Parameters
;DeviceInfo (PVOID) - output: Address of the byte-wide field containing the requested information. ;Item (USHORT) - input: Device information requested. :0 - Number of printers attached :1 - Number of RS232 ports :2 - Number of diskette drives :3 - Presence of math coprocessor (where 0 = not present, 1 = present) :4 - PC Submodel Type (where the return is the system submodel byte) :5 - PC Model Type (where the return is the system model byte) :6 - Display adapter type (where 0 = monochrome mode compatible, 1 = other). ;Parm (USHORT) - input: Reserved for future use and should be set to zero.
Return Code
;rc (USHORT) - return:Return code descriptions are: * 0 NO_ERROR *87 ERROR_INVALID_PARAMETER
Remarks
The system model (function 5) and submodel (function 4) information is obtained from BIOS.
In addition, the number of devices attached in a PS/2 environment reflect only devices that are “awake”. Devices that are “asleep” are not counted.
Bindings
C
#define INCL_DOSDEVICES USHORT rc = DosDevConfig(DeviceInfo, Item, Parm); PVOID DeviceInfo; /* Returned information */ USHORT Item; /* Item number */ USHORT Parm; /* Reserved */ USHORT rc; /* return */
MASM
EXTRN DosDevConfig:FAR INCL_DOSDEVICES EQU 1 PUSH@ OTHER DeviceInfo ;Requested information (returned) PUSH WORD Item ;Item number PUSH WORD Parm ;Reserved (must be zero) CALL DosDevConfig
Returns WORD </PRE>
Example Code
This example gets information about model type, monitor and coprocessor and display it.
#define INCL_DOSDEVICES
#define MACHINE_MODEL 5
#define DISPLAY_TYPE 6
#define FIND_COPROCESSOR 3
#define RESERVED 0L
BYTE DeviceInfo;
USHORT rc;
if(!DosDevConfig(&DeviceInfo, /* Returned information */
MACHINE_MODEL, /* Item number */
RESERVED)) /* Reserved */
printf("Model Type %d ",DeviceInfo);
if(!DosDevConfig(&DeviceInfo, /* Returned information */
DISPLAY_TYPE, /* Item number */
RESERVED)) /* Reserved */
if (DeviceInfo)
printf("Colour display ");
else
printf("Mono display ");
if(!DosDevConfig(&DeviceInfo, /* Returned information */
FIND_COPROCESSOR, /* Item number */
RESERVED)) /* Reserved */
if (DeviceInfo)
printf("Coprocessor");
else
printf("No Coprocessor");
Note
Text based on http://www.edm2.com/index.php/DosDevConfig_(Legacy)