Reading file names from a folder

Hi All,

 I my application a folder is getting created at runtime, and it stores various image files.
 I need to get a list of those file names and show them in a drop down combo box.

Which are the processors which would help me in traversing through a folder and getting the list of files?
Please help!!!

hi adev,

>  I my application a folder is getting created at runtime, and it stores
> various image files.
>  I need to get a list of those file names and show them in a drop down combo
> box.
>
> Which are the processors which would help me in traversing through a folder
> and getting the list of files?
> Please help!!!

There's a "directory scanner" that seems suitable for your task:

http://www.orbeon.com/ops/doc/processors-directory-scanner

HTH
florian



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Thanks Florian,

The Directory Scanner looks good. The output of the Directory Scanner is an XML Document with 'Directory' as the root node and subsequent 'file' nodes.

I am looking forward to write an XPL which would populate an Instance with the file names in that directory

Example
(Instance)
<xforms:instance id="filename-instance">
                <files xmlns="">
                        <filename />
                </files>
        </xforms:instance>


<xforms:submission id="getfilename" ref="instance('filename-instance')" action="getFileList" method="post" replace="instance" instance="filename-instance">
                        </xforms:submission>

Saving the output XML document and then parsing it to get the names would degrade the performance

How can I get the output in the above explained format?
 

fs(gmx) wrote

hi adev,

>  I my application a folder is getting created at runtime, and it stores
> various image files.
>  I need to get a list of those file names and show them in a drop down combo
> box.
>
> Which are the processors which would help me in traversing through a folder
> and getting the list of files?
> Please help!!!

There's a "directory scanner" that seems suitable for your task:

http://www.orbeon.com/ops/doc/processors-directory-scanner

HTH
florian



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hi adev
I think it would be easier to use the directory scanner output as it is.
It may contain some data you won't need, but you save a little time and
resources that would be consumed by an xslt transformation.

If you use the directory scanner output unchanged, you could reference
the filenames for example in a select1 comboBox as follows:

<xforms:select1 ref="selected-file" appearance="minimal">
     <xforms:itemset nodeset="instance('filename-instance')/file">
         <xforms:label ref="@name"/>
         <xforms:value ref="@name"/>
     </xforms:itemset>
</xforms:select1>

> How can I get the output in the above explained format?

You just have to combine the directory scanner with a xslt processor:

http://www.orbeon.com/ops/doc/processors-xslt

The XSLT could look as follows:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
     <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
     <xsl:template match="/directory">
         <files>
             <xsl:apply-templates select="file" />
         </files>
     </xsl:template>
     <xsl:template match="file">
         <filename>
             <xsl:value-of select="@name" />
         </filename>
     </xsl:template>
</xsl:stylesheet>

(this stylesheet ignores the files in subdirectories)

To combine the directory scanner with the xslt processor, you could use
something like:

<p:processor name="oxf:pipeline">
     <p:input name="config">
         <config>
             <base-directory>file:/</base-directory>
             <include>**/*.jpg</include>
             <exclude>**/*.xml</exclude>
             <case-sensitive>false</case-sensitive>
         </config>
     <p:output name="data" id="directory" />
</p:processor>

<p:processor name="oxf:xslt">
     <p:input name="data" href="#directory" />
     <p:input name="config" href="oxf:/xsl/dir2filelist.xsl" />
     <p:output name="data" id="filelist" />
</p:processor>

This way, the xslt processor loads an external xslt stylesheet to
perform the transformation. You could put the transformation code inside
the config input, too.

To send the filelist back to the xforms, just add a xml serializer:

http://www.orbeon.com/ops/doc/processors-serializers#xml-serializer

that takes the xslt output:

<p:processor name="oxf:xml-serializer">
     <p:input name="config">
         <config>
             <content-type>application/xml</content-type>
         </config>
     </p:input>
     <p:input name="data" href="#filelist"/>
</p:processor>

Connecting processor inputs and outputs is described here:

http://www.orbeon.com/ops/doc/reference-xpl-pipelines#d48e1098

and the xpl in- and outputs:

http://www.orbeon.com/ops/doc/reference-xpl-pipelines#param


HTH
florian




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We have the oxf:directory-scanner processor:

   http://www.orbeon.com/ops/doc/processors-directory-scanner

-Erik

On Mar 13, 2008, at 12:02 AM, adev wrote:
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