https://forge.codesys.com/forge/talk/CODESYS-V2/thread/72632fa455/2020-02-27T21:54:40.719000ZRecent posts to Can external C function fill structure declared in CoDeSys?2020-02-27T21:54:40.719000Z2020-02-27T21:54:40.719000Zshooterhttps://forge.codesys.com/u/shooter/https://forge.codesys.combfbfce9c4d77d388d8970302d898c0bcda03e495

<div class="markdown_content"><p>In version 2 not possible, in version 3 it is.</p></div>

2020-02-27T21:54:39.036000Z2020-02-27T21:54:39.036000ZDubravkohttps://forge.codesys.com/u/dubravko/https://forge.codesys.comefab8dca3155d00144e99dc8e53b78a1c57a0ae5

<div class="markdown_content"><p>Hello,</p> <p>I have a question regarding functions that return structures and that are located in external library which is part of RTS.</p> <p>Let's say that I have a function named Dummy that's part of the RTS and looks like this:</p> <div class="codehilite"><pre><span></span><span class="n">StructureType</span><span class="o">*</span><span class="err"> </span> <span class="err"> </span><span class="n">Dummy</span> <span class="p">(</span> <span class="n">StructureType</span><span class="o">*</span><span class="err"> </span> <span class="n">DataToBeLoaded</span><span class="p">){</span> <span class="sr">//</span> <span class="n">code</span><span class="p">,</span> <span class="n">code</span><span class="p">,</span> <span class="n">code</span><span class="p">,</span> <span class="n">loading</span><span class="p">,</span> <span class="n">loading</span> <span class="n">loading</span> <span class="n">the</span> <span class="n">structure</span> <span class="k">return</span> <span class="n">DataToBeLoaded</span><span class="p">;</span> <span class="p">}</span> </pre></div> <p>I defined an external library in CoDeSys like this:</p> <div class="codehilite"><pre><span></span><span class="nt">FUNCTION</span> <span class="nt">Dummy</span><span class="o">:</span> <span class="nt">POINTER</span> <span class="nt">TO</span> <span class="nt">ARRAY</span><span class="cp">[</span><span class="mi">1</span><span class="bp">..</span><span class="nx nx-Member">ArrayLength</span><span class="cp">]</span> <span class="nt">OF</span> <span class="nt">StructureType</span> <span class="nt">VAR_INPUT</span> <span class="err"> </span> <span class="err"> </span><span class="nt">DataToBeLoaded</span><span class="o">:</span><span class="err"> </span> <span class="err"> </span> <span class="nt">POINTER</span> <span class="nt">TO</span> <span class="nt">ARRAY</span><span class="cp">[</span><span class="mi">1</span><span class="bp">..</span><span class="nx nx-Member">ArrayLength</span><span class="cp">]</span> <span class="nt">OF</span> <span class="nt">StructureType</span><span class="o">;</span> <span class="nt">END_VAR</span> </pre></div> <p>The main task of this function is to take structure from CoDeSys and load it with data from file. I'm using C lib, because it is easier to manipulate complex text file, like the one I'm dealing with.</p> <p>Problem is that is not loaded with any data. </p> <p>At the same time I see that function is being exectued and the structure inside of the function is being filled properly (I see it over Telnet).</p> <p>Does anyone have some idea how to handle this?</p> <p>Thanks in advance.</p></div>