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IOCTL_NFP_GET_MAX_MESSAGE_BYTES IOCTL (nfpdev.h)

  • Article

A client sends the IOCTL_NFP_GET_MAX_MESSAGE_BYTES request to any generic handle, one that is non-published and non-subscribed, to the provider device to determine the maximum message size supported.

Major code

IRP_MJ_DEVICE_CONTROL

Input buffer

None

Output buffer

One INT32 value that defines the maximum message size supported by the provide.

Status block

Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful.

Otherwise, Status to the appropriate error condition as a NTSTATUS code.

For more information, see NTSTATUS Values.

Remarks

  • Each provider implementation can specify a maximum message size for publications and subscriptions. Windows requires that this maximum provider-supported message size be no less than 10 KB.
  • The following are required actions when using this ioctl:
    • The driver MUST support a maximum message size no smaller than 10 KB.
    • When this IOCTL is received, the driver MUST copy the maximum message size into the output buffer and complete it with STATUS_SUCCESS.

Requirements

Requirement Value
Minimum supported client Windows 8
Header nfpdev.h

See also

Near field communication (NFC) overall design guide

Near field proximity design guide (Tap and Do, NFP provider model, driver requirements)