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Inside Macintosh: Devices /

Chapter 2 - Slot Manager / Slot Manager Reference

Slot Manager Routines / Enabling, Disabling, Deleting, and Restoring sResources

SetSRsrcState

You can use the SetSRsrcState function to select which sResources are enabled.

FUNCTION SetSRsrcState (spBlkPtr: SpBlockPtr): OSErr;

spBlkPtr

A pointer to a Slot Manager parameter block.

-->	spParamData	LongInt	Either a value of 0 to enable the sResource or a value of 1 to disable it.
-->	spSlot	SignedByte	The slot number.
-->	spId	SignedByte	The sResource ID.
-->	spExtDev	SignedByte	The external device identifier.

DESCRIPTION

The SetSRsrcState function enables or disables an sResource. All of the Slot Manager functions recognize enabled sResources, while only the SGetSRsrc and SGetTypeSRsrc functions (described on page 2-33 and page 2-35, respectively) can recognize disabled ones.

You specify the sResource to enable or disable with the spSlot, spID, and spExtDev fields of the Slot Manager parameter block you point to in the spBlkPtr parameter, and you specify whether to enable or disable it in the spParamData field. The Slot Manager enables the sResource when the spParamData field has a value of 0 and disables it when the field has a value of 1.

SPECIAL CONSIDERATIONS

The SetSRsrcState function is available only with version 1 or later of the Slot Manager. You can use the SVersion function, described on page 2-30, to determine whether the Slot Manager is version 1 or later.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the SetSRsrcState function are

Trap macro	Selector
_SlotManager	$0009

You must set up register D0 with the routine selector and register A0 with the address of the Slot Manager parameter block. When _SlotManager returns, register D0 contains the result code.

Registers on entry
A0	Address of the parameter block
D0	$0009

Registers on exit
D0	Result code

RESULT CODES

noErr	0	No error
smNoMoresRsrcs	-344	Requested sResource not found

SEE ALSO

For more information on enabling and disabling sResources, see "Enabling and Disabling sResources" on page 2-18.

For information on finding disabled sResources, see the description of the SGetSRsrc function on page 2-33 and the description of the SGetTypeSRsrc function on page 2-35.