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        KDE 4.4 PyKDE API Reference
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<h1>KMimeTypeTrader Class Reference</h1>
<code>from PyKDE4.kdecore import *</code>
<p>



<h2>Detailed Description</h2>

<p>KDE's trader for services associated to a given mimetype.
</p>
<p>
Example: say that you want to the list of all KParts components that can handle HTML.
Our code would look like:
<pre class="fragment">
 KService.List lst = KMimeTypeTrader.self()-&gt;query("text/html",
                                                        "KParts/ReadOnlyPart");
</pre>
</p>
<p>
If you want to get the preferred KParts component for text/html you could use
preferredService("text/html", "KParts/ReadOnlyPart"), although if this is about
loading that component you would use createPartInstanceFromQuery directly.
</p>
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd> KServiceTypeTrader, KService
</dd></dl>
</p>
<table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#KMimeTypeTrader">__init__</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#KMimeTypeTrader">__init__</a> (self, <a href="../kdecore/KMimeTypeTrader.html">KMimeTypeTrader</a> other)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KService.Ptr.html">KService.Ptr</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#preferredService">preferredService</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> mimeType, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> genericServiceType=QString.fromLatin1("Application"))</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KService.List.html">KService.List</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#query">query</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> mimeType, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> genericServiceType=QString.fromLatin1("Application"), <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> constraint=QString())</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KMimeTypeTrader.html">KMimeTypeTrader</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#self">self</a> (self)</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="KMimeTypeTrader"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype">&nbsp;</td>
<td class="paramname"><em>self</em>&nbsp;)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p><dl class="internal" compact><dt><b>Internal:</b></dt><dd>
</dd></dl>
</p></div></div><a class="anchor" name="KMimeTypeTrader"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype">&nbsp;<em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../kdecore/KMimeTypeTrader.html">KMimeTypeTrader</a>&nbsp;</td>
<td class="paramname"><em>other</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"></div></div><a class="anchor" name="preferredService"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KService.Ptr.html">KService.Ptr</a> preferredService</td>
<td>(</td>
<td class="paramtype">&nbsp;<em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a>&nbsp;</td>
<td class="paramname"><em>mimeType</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a>&nbsp;</td>
<td class="paramname"><em>genericServiceType=QString.fromLatin1("Application")</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Returns the preferred service for <b>mimeType</b> and <b>genericServiceType</b>
</p>
<p>
This is almost like offers().first(), except that it also checks
if the service is allowed as a preferred service (see KService.allowAsDefault).
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>mimeType</em>&nbsp;</td><td> the mime type (see offers())

<tr><td></td><td valign="top"><em>genericServiceType</em>&nbsp;</td><td> the service type (see offers())
</td></tr> </table></dl>
<p> <dl class="return" compact><dt><b>Returns:</b></dt><dd> the preferred service, or 0 if no service is available
</dd></dl>
</p></div></div><a class="anchor" name="query"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KService.List.html">KService.List</a> query</td>
<td>(</td>
<td class="paramtype">&nbsp;<em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a>&nbsp;</td>
<td class="paramname"><em>mimeType</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a>&nbsp;</td>
<td class="paramname"><em>genericServiceType=QString.fromLatin1("Application")</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a>&nbsp;</td>
<td class="paramname"><em>constraint=QString()</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>This method returns a list of services which are associated with a given mimetype.
</p>
<p>
Example usage:
To get list of applications that can handle a given mimetype,
set <b>genericServiceType</b> to "Application" (which is the default).
To get list of embeddable components that can handle a given mimetype,
set <b>genericServiceType</b> to "KParts/ReadOnlyPart".
</p>
<p>
The constraint parameter is used to limit the possible choices
returned based on the constraints you give it.
</p>
<p>
The <b>constraint</b> language is rather full. The most common
keywords are AND, OR, NOT, IN, and EXIST, all used in an
almost spoken-word form. An example is:
<pre class="fragment">
 (Type == 'Service') and (('Browser/View' in ServiceTypes) and (exist Library))
</pre>
</p>
<p>
The keys used in the query (Type, ServiceTypes, Library) are all
fields found in the .desktop files.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>mimeType</em>&nbsp;</td><td> A mime type like 'text/plain' or 'text/html'.

<tr><td></td><td valign="top"><em>genericServiceType</em>&nbsp;</td><td> a basic service type, like 'KParts/ReadOnlyPart' or 'Application'

<tr><td></td><td valign="top"><em>constraint</em>&nbsp;</td><td> A constraint to limit the choices returned, QString() to
get all services that can handle the given <b>mimetype</b>
</td></tr>
</table></dl>
<p> <dl class="return" compact><dt><b>Returns:</b></dt><dd> A list of services that satisfy the query, sorted by preference
(preferred service first)
</dd></dl> <dl class="see" compact><dt><b>See also:</b></dt><dd> http://techbase.kde.org/Development/Tutorials/Services/Traders#The_KTrader_Query_Language
</dd></dl>
</p></div></div><a class="anchor" name="self"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KMimeTypeTrader.html">KMimeTypeTrader</a> self</td>
<td>(</td>
<td class="paramtype">&nbsp;</td>
<td class="paramname"><em>self</em>&nbsp;)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>This is a static pointer to the KMimeTypeTrader singleton.
</p>
<p>
You will need to use this to access the KMimeTypeTrader functionality since the
constructors are protected.
</p>
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd> Static KMimeTypeTrader instance
</dd></dl>
</p></div></div>
</div>
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