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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>usb_claim_interface</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REL="HOME"
TITLE="libusb Developers Guide"
HREF="index.html"><LINK
REL="UP"
TITLE="Device operations"
HREF="ref.deviceops.html"><LINK
REL="PREVIOUS"
TITLE="usb_reset"
HREF="function.usbreset.html"><LINK
REL="NEXT"
TITLE="usb_release_interface"
HREF="function.usbreleaseinterface.html"><LINK
REL="STYLESHEET"
TYPE="text/css"
HREF="/base.css"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>libusb Developers Guide</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="function.usbreset.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="function.usbreleaseinterface.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="FUNCTION.USBCLAIMINTERFACE"
></A
>usb_claim_interface</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN277"
></A
><H2
>Name</H2
>usb_claim_interface&nbsp;--&nbsp;Claim an interface of a device</DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN280"
></A
><H2
>Description</H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN282"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int usb_claim_interface</CODE
>(usb_dev_handle *dev, int interface);</CODE
></P
><P
></P
></DIV
><P
><CODE
CLASS="FUNCTION"
>usb_claim_interface</CODE
> claims the interface with the Operating System. The interface parameter is the value as specified in the descriptor field bInterfaceNumber. Returns 0 on success or &lt; 0 on error.</P
><DIV
CLASS="IMPORTANT"
><BLOCKQUOTE
CLASS="IMPORTANT"
><P
><B
>Must be called!: </B
><CODE
CLASS="FUNCTION"
>usb_claim_interface</CODE
> <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>must</I
></SPAN
> be called before you perform any operations related to this interface (like <A
HREF="function.usbsetaltinterface.html"
>usb_set_altinterface</A
>, <A
HREF="function.usbbulkwrite.html"
>usb_bulk_write</A
>, etc).</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="TABLE"
><A
NAME="AEN299"
></A
><P
><B
>Table 1. Return Codes</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>code</TH
><TH
>description</TH
></TR
></THEAD
><TBODY
><TR
><TD
>-EBUSY</TD
><TD
>Interface is not available to be claimed</TD
></TR
><TR
><TD
>-ENOMEM</TD
><TD
>Insufficient memory</TD
></TR
></TBODY
></TABLE
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="function.usbreset.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.usbreleaseinterface.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>usb_reset</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ref.deviceops.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>usb_release_interface</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>