1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2<html xml:lang="en-US" lang="en-US" xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <meta http-equiv="Content-Style-Type" content="text/css" /> 6 <link rel="stylesheet" href="../../../../css/manpage.css" type="text/css" /> 7<title>ExtractExif</title> 8 </head> 9 <body> 10<h1><CODE>nn::jpeg::CTR::JpegMpDecoder::ExtractExif</CODE> Member Function</h1> 11<h2>Syntax</h2> 12 <div class="section"> 13 <pre class="definition">#include <nn/jpeg.h> 14bool ExtractExif( 15 const u8 * src, 16 size_t srcSize, 17 bool extractThumbnail 18); 19</pre> 20 </div> 21<h2>Arguments</h2> 22 <div class="section"> 23 <table class="arguments"> 24 <thead> 25 <tr> 26 <td width="15" /> 27<th>Name</th> 28<td>Description</td> 29 </tr> 30 </thead> 31 <tr> 32<td>in</td> 33<th>src</th> 34<td>Specifies the JPEG data to decode.</td> 35 </tr> 36 <tr> 37<td>in</td> 38<th>srcSize</th> 39<td>Specifies the size of <SPAN class="argument">src</SPAN> in bytes.</td> 40 </tr> 41 <tr> 42<td>in</td> 43<th>extractThumbnail</th> 44<td>Specify <CODE>true</CODE> to extract the thumbnail image size.<br />Specify <CODE>false</CODE> to extract the primary image size.<br />Fails if <CODE>true</CODE> is specified but no thumbnail is found.</td> 45 </tr> </table> 46 </div> 47<h2>Return Values</h2> 48<div class="section">Returns <CODE>true</CODE> on success. Even if no Exif information exists this function will return <CODE>true</CODE> if it is possible to obtain the image size.<br />Returns <CODE>false</CODE> on failure. Use the <CODE><a href="../../../../nn/jpeg/CTR/JpegMpEncoder/GetLastError.html">GetLastError</a></CODE> function to get the reason for failure. </div> 49<h2>Description</h2> 50 <div class="section"> 51<p>Extracts Exif information.</p><p>Because this function does not decode the image, it can get information more quickly than the <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/StartJpegDecoder.html"><CODE>StartJpegDecoder</CODE></a> function.<br></p><p>To actually get the information included in EXIF, call this function first, and after it has succeeded, use the <CODE>GetLast</CODE> functions below.</p><p><UL> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastDateTime.html"><CODE>GetLastDateTime</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastSoftwarePointer.html"><CODE>GetLastSoftwarePointer</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastSoftwareLength.html"><CODE>GetLastSoftwareLength</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastUserMakerNotePointer.html"><CODE>GetLastUserMakerNotePointer</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastUserMakerNoteSize.html"><CODE>GetLastUserMakerNoteSize</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastTwlPhotoMakerNote.html"><CODE>GetLastTwlPhotoMakerNote</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastTwlUserMakerNotePointer.html"><CODE>GetLastTwlUserMakerNotePointer</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastTwlUserMakerNoteSize.html"><CODE>GetLastTwlUserMakerNoteSize</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastImageUid.html"><CODE>GetLastImageUid</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastOrientation.html"><CODE>GetLastOrientation</CODE></a> <LI> <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastGpsData.html">GetLastGpsData</a> </LI></UL></p><p>Use the <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastWidth.html"><CODE>GetLastWidth</CODE></a> and <a href="../../../../nn/jpeg/CTR/JpegMpDecoder/GetLastHeight.html"><CODE>GetLastHeight</CODE></a> functions to get the image size of either the primary or thumbnail images.</p><p>Image decoding might fail even if this function succeeds.</p><!-- write here --></div> 52<h2>Revision History</h2> 53 <div class="section"> 54 <dl class="history"> 55 <dt>2010/06/14</dt> 56<dd>Initial version.<br /> 57 </dd> 58 </dl> 59 </div> 60 <hr><p>CONFIDENTIAL</p></body> 61</html> 62