IOCTL_BTHX_QUERY_CAPABILITIES - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// bthxddi.h

// CTL_CODE(0x0041, 0x102, METHOD_NEITHER, FILE_ANY_ACCESS)
#define IOCTL_BTHX_QUERY_CAPABILITIES 0x0041040B
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ni-bthxddi-ioctl_bthx_query_capabilities)

IOCTL_BTHX_QUERY_CAPABILITIES IOCTL

Description

IOCTL_BTHX_QUERY_CAPABILITIES is used to query the capabilities of the transport driver.

Parameters

Major code

Input buffer

None.

Input buffer length

None.

Output buffer

The AssociatedIrp.SystemBuffer member points to a buffer that holds a BTHX_CAPABILITIES structure.

Output buffer length

The length of the buffer is the size of the BTHX_CAPABILITIES structure.

Input/output buffer

Input/output buffer length

Status block

The Information member of the STATUS_BLOCK structure is set to the size of the structure.

The Status member is set to one of the values in the following table.

Status value Description
STATUS_SUCCESS The IOCTL completed successfully.

Remarks

During startup, the Bluetooth stack sends IOCTL_BTHX_QUERY_CAPABILITIES to query the capabilities of the transport driver.

This is a synchronous call and failure of this IOCTL prevents Windows from loading the Bluetooth stack.

The output buffer of this IOCTL is defined by the BTHX_CAPABILITIES structure.

The MaxScoChannels member must be set to 1. The ScoSupport member must be set to ScoSupportHCIBypass. Failure to do so prevents the stack from being loaded.

View the official Windows Driver Kit DDI reference

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