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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_interrupt_read</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="Interrupt Transfers" HREF="ref.interrupt.html"><LINK REL="PREVIOUS" TITLE="usb_interrupt_write" HREF="function.usbinterruptwrite.html"><LINK REL="NEXT" TITLE="Non Portable" HREF="ref.nonportable.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.usbinterruptwrite.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="ref.nonportable.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="FUNCTION.USBINTERRUPTREAD" ></A >usb_interrupt_read</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN538" ></A ><H2 >Name</H2 >usb_interrupt_read -- Read data from a interrupt endpoint</DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN541" ></A ><H2 >Description</H2 ><DIV CLASS="FUNCSYNOPSIS" ><P ></P ><A NAME="AEN543" ></A ><P ><CODE ><CODE CLASS="FUNCDEF" >int usb_interrupt_read</CODE >(usb_dev_handle *dev, int ep, char *bytes, int size, int timeout);</CODE ></P ><P ></P ></DIV ><P ><CODE CLASS="FUNCTION" >usb_interrupt_read</CODE > performs a interrupt read request to the endpoint specified by <CODE CLASS="VARNAME" >ep</CODE >. Returns number of bytes read on success or < 0 on error.</P ></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.usbinterruptwrite.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="ref.nonportable.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >usb_interrupt_write</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.interrupt.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Non Portable</TD ></TR ></TABLE ></DIV ></BODY ></HTML >