ChangerGetProductData function (mcd.h)
ChangerGetProductData handles the device-specific aspects of a device-control IRP with the IOCTL code IOCTL_CHANGER_GET_PRODUCT_DATA.
Syntax
NTSTATUS ChangerGetProductData(
[in] PDEVICE_OBJECT DeviceObject,
[in] PIRP Irp
);
Parameters
[in] DeviceObject
Pointer to the device object that represents the changer.
[in] Irp
Pointer to the IRP.
Return value
ChangerGetProductData always returns STATUS_SUCCESS.
Remarks
This routine is required.
ChangerGetProductData returns product data for a changer.
The changer class driver checks the output buffer length in the I/O stack location before calling ChangerGetProductData. If output buffer length is smaller than sizeof(CHANGER_PRODUCT_DATA) then the changer class driver returns with a value of STATUS_INFO_LENGTH_MISMATCH
ChangerGetProductData fills in a CHANGER_PRODUCT_DATA structure at Irp->AssociatedIrp.SystemBuffer before returning to the changer class driver. If the miniclass driver cached inquiry data in the changer's device extension before returning from ChangerInitialize, all members except DeviceType can be filled in from this data.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Desktop |
| Header | mcd.h (include Mcd.h, Ntddchgr.h) |
| IRQL | PASSIVE_LEVEL |