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1 .. _creating-plugins:
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2
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3 Creating new plugins
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4 ====================
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5
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6 The recommended way of :ref:`contributing to the Orthanc code
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7 <contributing>` consists in extending it by creating new :ref:`plugins
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8 <plugins>`.
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9
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10 Overview
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11 --------
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12
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13 Orthanc plugins must use the `plugin SDK
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14 <https://orthanc.chu.ulg.ac.be/sdk/index.html>`__ and must be written
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15 in C or C++. They must also fullfil the terms of the `GPLv3 license
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16 <http://www.gnu.org/licenses/quick-guide-gplv3.en.html>`__ that is
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17 used by the core of Orthanc. Sample code for plugins can be found `in
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18 the official Orthanc repository
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19 <https://bitbucket.org/sjodogne/orthanc/src/default/Plugins/Samples/>`__
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20 (in the ``Plugins/Samples`` folder). A
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21 tutorial showing how to implement a basic WADO server is `available on
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22 CodeProject
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23 <http://www.codeproject.com/Articles/797118/Implementing-a-WADO-Server-using-Orthanc>`__.
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24
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25 We suggest developers to adopt the :ref:`coding style of the Orthanc
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26 core <coding-style>`, although this is of course not required.
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27
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28 Do not hesitate to `contact us
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29 <http://www.orthanc-server.com/static.php?page=contact>`__ if you wish
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30 your plugin to be **indexed** in :ref:`this part of the Orthanc Book
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31 <plugins-contributed>`!
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32
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33
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34 Structure of the plugins
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35 ------------------------
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36
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37 A plugin takes the form of a shared library (``.DLL`` under Windows,
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38 ``.so`` under GNU/Linux, ``.dylib`` under Apple OS X...) that use the
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39 `ABI of the C language
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40 <https://en.wikipedia.org/wiki/Application_binary_interface>`__ to
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41 declare 4 public functions/symbols:
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42
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43 * ``int32_t OrthancPluginInitialize(OrthancPluginContext* context)``. This
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44 callback function is responsible for initializing the plugin. The
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45 ``context`` argument gives access to the API of Orthanc.
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46 * ``void OrthancPluginFinalize()``. This function is responsible
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47 for finalizing the plugin, releasing all the allocated resources.
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48 * ``const char* OrthancPluginGetName()``. This function must give a
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49 name to the plugin.
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50 * ``const char* OrthancPluginGetVersion()``. This function must
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51 provide the version of the plugin.
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52
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53 *Remark:* The size of the memory buffers that are exchanged between
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54 the Orthanc core and the plugins must be below 4GB. This is a
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55 consequence of the fact that the Orthanc plugin SDK uses ``uint32_t``
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56 to encode the size of a memory buffer. We might extend the SDK in
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57 the future to deal with buffers whose size if above 4GB.
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