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><H1
><A
NAME="FUNCTION.USBCLAIMINTERFACE"
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>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
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><P
><B
>Table 1. Return Codes</B
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><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
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