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<h1>libusb_interface_descriptor Struct Reference<br/>
<small>
[<a class="el" href="group__desc.html">USB descriptors</a>]</small>
</h1><!-- doxytag: class="libusb_interface_descriptor" -->
<p>A structure representing the standard USB interface descriptor.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="libusb_8h_source.html">libusb.h</a>></code></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Data Fields</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a646b7bf875e5b927796d47e57c9182b8"></a><!-- doxytag: member="libusb_interface_descriptor::bLength" ref="a646b7bf875e5b927796d47e57c9182b8" args="" -->
uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a646b7bf875e5b927796d47e57c9182b8">bLength</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Size of this descriptor (in bytes). <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#affe977ae83d3bbf07513d87ebfb6ed0e">bDescriptorType</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Descriptor type. <a href="#affe977ae83d3bbf07513d87ebfb6ed0e"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a75046f443d3330f590f3d3fb1f9df863"></a><!-- doxytag: member="libusb_interface_descriptor::bInterfaceNumber" ref="a75046f443d3330f590f3d3fb1f9df863" args="" -->
uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a75046f443d3330f590f3d3fb1f9df863">bInterfaceNumber</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Number of this interface. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a2c94bce217e8ecd5fd23728510e9c838"></a><!-- doxytag: member="libusb_interface_descriptor::bAlternateSetting" ref="a2c94bce217e8ecd5fd23728510e9c838" args="" -->
uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a2c94bce217e8ecd5fd23728510e9c838">bAlternateSetting</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Value used to select this alternate setting for this interface. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a487bd2058bfbe749d370c6e7d3add20e">bNumEndpoints</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Number of endpoints used by this interface (excluding the control endpoint). <a href="#a487bd2058bfbe749d370c6e7d3add20e"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a19dcf80e6a5fedf3d3673630897ad649">bInterfaceClass</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">USB-IF class code for this interface. <a href="#a19dcf80e6a5fedf3d3673630897ad649"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a0b9b890f84694a4e6a0103944e1247f4"></a><!-- doxytag: member="libusb_interface_descriptor::bInterfaceSubClass" ref="a0b9b890f84694a4e6a0103944e1247f4" args="" -->
uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a0b9b890f84694a4e6a0103944e1247f4">bInterfaceSubClass</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">USB-IF subclass code for this interface, qualified by the bInterfaceClass value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5062bbb17fc76e6c3624ea7ca68d554c"></a><!-- doxytag: member="libusb_interface_descriptor::bInterfaceProtocol" ref="a5062bbb17fc76e6c3624ea7ca68d554c" args="" -->
uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a5062bbb17fc76e6c3624ea7ca68d554c">bInterfaceProtocol</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">USB-IF protocol code for this interface, qualified by the bInterfaceClass and bInterfaceSubClass values. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a19227cc111c27e27c2c07430777e1ab8"></a><!-- doxytag: member="libusb_interface_descriptor::iInterface" ref="a19227cc111c27e27c2c07430777e1ab8" args="" -->
uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a19227cc111c27e27c2c07430777e1ab8">iInterface</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Index of string descriptor describing this interface. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="structlibusb__endpoint__descriptor.html">libusb_endpoint_descriptor</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#a44eb8efab382a6a793bb994c6f15fcb9">endpoint</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Array of endpoint descriptors. <a href="#a44eb8efab382a6a793bb994c6f15fcb9"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const unsigned char * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#aa1169e8c0b22a9928bbd51169609f31d">extra</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Extra descriptors. <a href="#aa1169e8c0b22a9928bbd51169609f31d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlibusb__interface__descriptor.html#ad77fa0b951a83d0c7eac28920367f200">extra_length</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Length of the extra descriptors, in bytes. <a href="#ad77fa0b951a83d0c7eac28920367f200"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>A structure representing the standard USB interface descriptor. </p>
<p>This descriptor is documented in section 9.6.5 of the USB 2.0 specification. All multiple-byte fields are represented in host-endian format. </p>
<hr/><h2>Field Documentation</h2>
<a class="anchor" id="affe977ae83d3bbf07513d87ebfb6ed0e"></a><!-- doxytag: member="libusb_interface_descriptor::bDescriptorType" ref="affe977ae83d3bbf07513d87ebfb6ed0e" args="" -->
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<td class="memname">uint8_t <a class="el" href="structlibusb__interface__descriptor.html#affe977ae83d3bbf07513d87ebfb6ed0e">libusb_interface_descriptor::bDescriptorType</a></td>
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<p>Descriptor type. </p>
<p>Will have value <a class="el" href="group__desc.html#gga0a2e8a25dfdebf29fdd4764dcdbc1a9ca797f18e35ee27434562aed0c20c46b78">libusb_descriptor_type::LIBUSB_DT_INTERFACE</a> LIBUSB_DT_INTERFACE in this context. </p>
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<a class="anchor" id="a487bd2058bfbe749d370c6e7d3add20e"></a><!-- doxytag: member="libusb_interface_descriptor::bNumEndpoints" ref="a487bd2058bfbe749d370c6e7d3add20e" args="" -->
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<td class="memname">uint8_t <a class="el" href="structlibusb__interface__descriptor.html#a487bd2058bfbe749d370c6e7d3add20e">libusb_interface_descriptor::bNumEndpoints</a></td>
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<p>Number of endpoints used by this interface (excluding the control endpoint). </p>
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<a class="anchor" id="a19dcf80e6a5fedf3d3673630897ad649"></a><!-- doxytag: member="libusb_interface_descriptor::bInterfaceClass" ref="a19dcf80e6a5fedf3d3673630897ad649" args="" -->
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<td class="memname">uint8_t <a class="el" href="structlibusb__interface__descriptor.html#a19dcf80e6a5fedf3d3673630897ad649">libusb_interface_descriptor::bInterfaceClass</a></td>
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<p>USB-IF class code for this interface. </p>
<p>See <a class="el" href="group__desc.html#gac529888effbefef8af4f9d17ebc903a1">libusb_class_code</a>. </p>
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<a class="anchor" id="a44eb8efab382a6a793bb994c6f15fcb9"></a><!-- doxytag: member="libusb_interface_descriptor::endpoint" ref="a44eb8efab382a6a793bb994c6f15fcb9" args="" -->
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<td class="memname">struct <a class="el" href="structlibusb__endpoint__descriptor.html">libusb_endpoint_descriptor</a>* <a class="el" href="structlibusb__interface__descriptor.html#a44eb8efab382a6a793bb994c6f15fcb9">libusb_interface_descriptor::endpoint</a></td>
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<p>Array of endpoint descriptors. </p>
<p>This length of this array is determined by the bNumEndpoints field. </p>
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<a class="anchor" id="aa1169e8c0b22a9928bbd51169609f31d"></a><!-- doxytag: member="libusb_interface_descriptor::extra" ref="aa1169e8c0b22a9928bbd51169609f31d" args="" -->
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<td class="memname">const unsigned char* <a class="el" href="structlibusb__interface__descriptor.html#aa1169e8c0b22a9928bbd51169609f31d">libusb_interface_descriptor::extra</a></td>
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<p>Extra descriptors. </p>
<p>If libusb encounters unknown interface descriptors, it will store them here, should you wish to parse them. </p>
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<a class="anchor" id="ad77fa0b951a83d0c7eac28920367f200"></a><!-- doxytag: member="libusb_interface_descriptor::extra_length" ref="ad77fa0b951a83d0c7eac28920367f200" args="" -->
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<td class="memname">int <a class="el" href="structlibusb__interface__descriptor.html#ad77fa0b951a83d0c7eac28920367f200">libusb_interface_descriptor::extra_length</a></td>
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<p>Length of the extra descriptors, in bytes. </p>
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<hr/>The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="libusb_8h_source.html">libusb.h</a></li>
</ul>
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