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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_get_descriptor</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="Control Transfers" HREF="ref.control.html"><LINK REL="PREVIOUS" TITLE="usb_get_string_simple" HREF="function.usbgetstringsimple.html"><LINK REL="NEXT" TITLE="usb_get_descriptor_by_endpoint" HREF="function.usbgetdescriptorbyendpoint.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.usbgetstringsimple.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.usbgetdescriptorbyendpoint.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="FUNCTION.USBGETDESCRIPTOR" ></A >usb_get_descriptor</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN408" ></A ><H2 >Name</H2 >usb_get_descriptor -- Retrieves a descriptor from a device's default control pipe</DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN411" ></A ><H2 >Description</H2 ><DIV CLASS="FUNCSYNOPSIS" ><P ></P ><A NAME="AEN413" ></A ><P ><CODE ><CODE CLASS="FUNCDEF" >int usb_get_descriptor</CODE >(usb_dev_handle *dev, unsigned char type, unsigned char index, void *buf, int size);</CODE ></P ><P ></P ></DIV ><P ><CODE CLASS="FUNCTION" >usb_get_descriptor</CODE > retrieves a descriptor from the device identified by the <CODE CLASS="VARNAME" >type</CODE > and <CODE CLASS="VARNAME" >index</CODE > of the descriptor from the default control pipe. Returns number of bytes read for the descriptor or < 0 on error.</P ><P >See <A HREF="function.usbgetdescriptorbyendpoint.html" >usb_get_descriptor_by_endpoint</A > for a function that allows the control endpoint to be specified.</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.usbgetstringsimple.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.usbgetdescriptorbyendpoint.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >usb_get_string_simple</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.control.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >usb_get_descriptor_by_endpoint</TD ></TR ></TABLE ></DIV ></BODY ></HTML >