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HSSF docs updated: added a note on using HSSFSheet.autoSizeColumn in headless mode and added a note on how to read images from a workbook 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@535623 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2007-05-06 15:35:39 +00:00
parent c147b22f61
commit 5c789d18d3
1 changed files with 25 additions and 4 deletions
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29
src/documentation/content/xdocs/hssf/quick-guide.xml
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@ -975,8 +975,7 @@
<li>DIB</li>
</ul>
<p>
It is not currently possible to read existing images and it
should be noted that any existing drawings may be erased
It should be noted that any existing drawings may be erased
once you add a image to a sheet.
</p>
<source>
@ -988,7 +987,23 @@
anchor = new HSSFClientAnchor(0,0,0,255,(short)2,2,(short)4,7);
anchor.setAnchorType( 2 );
patriarch.createPicture(anchor, loadPicture( "src/resources/logos/logoKarmokar4.png", wb ));
</source>
</source>
<p>Reading images from a workbook:</p>
<source>
HSSFWorkbook wb;
List lst = wb.getAllPictures();
for (Iterator it = lst.iterator(); it.hasNext(); ) {
HSSFPictureData pict = (HSSFPictureData)it.next();
String ext = pict.suggestFileExtension();
byte[] data = pict.getData();
if (ext.equals("jpeg")){
FileOutputStream out = new FileOutputStream("pict.jpg");
out.write(data);
out.close();
}
}
</source>
</section>
<anchor id="NamedRanges"/>
<section>
@ -1141,7 +1156,13 @@
sheet.autoSizeColumn((short)0); //adjust width of the first column
sheet.autoSizeColumn((short)1); //adjust width of the second column
</source>
<warning>
To calculate column width HSSFSheet.autoSizeColumn uses Java2D classes
that throw exception if graphical environment is not available. In case if graphical environment
is not available, you must tell Java that you are running in headless mode and
set the following system property: <code> java.awt.headless=true </code>
(either via <code>-Djava.awt.headless=true</code> startup parameter or via <code>System.setProperty("java.awt.headless", "true")</code>).
</warning>
</section>
</body>