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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 >Control Transfers</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="Functions" HREF="functions.html"><LINK REL="PREVIOUS" TITLE="usb_release_interface" HREF="function.usbreleaseinterface.html"><LINK REL="NEXT" TITLE="usb_control_msg" HREF="function.usbcontrolmsg.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="/base.css"></HEAD ><BODY CLASS="REFERENCE" 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.usbreleaseinterface.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.usbcontrolmsg.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="REFERENCE" ><A NAME="REF.CONTROL" ></A ><DIV CLASS="TITLEPAGE" ><H1 CLASS="TITLE" >III. Control Transfers</H1 ><DIV CLASS="PARTINTRO" ><A NAME="AEN332" ></A ><P >This group of functions allow applications to send messages to the default control pipe.</P ></DIV ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT ><A HREF="function.usbcontrolmsg.html" >usb_control_msg</A > -- Send a control message to a device</DT ><DT ><A HREF="function.usbgetstring.html" >usb_get_string</A > -- Retrieves a string descriptor from a device</DT ><DT ><A HREF="function.usbgetstringsimple.html" >usb_get_string_simple</A > -- Retrieves a string descriptor from a device using the first language</DT ><DT ><A HREF="function.usbgetdescriptor.html" >usb_get_descriptor</A > -- Retrieves a descriptor from a device's default control pipe</DT ><DT ><A HREF="function.usbgetdescriptorbyendpoint.html" >usb_get_descriptor_by_endpoint</A > -- Retrieves a descriptor from a device</DT ></DL ></DIV ></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.usbreleaseinterface.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.usbcontrolmsg.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >usb_release_interface</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="functions.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >usb_control_msg</TD ></TR ></TABLE ></DIV ></BODY ></HTML >