https://forge.codesys.com/forge/talk/Engineering/thread/6078784843/2020-04-25T20:15:07.839000ZRecent posts to Variable size array2020-04-25T20:15:07.839000Z2020-04-25T20:15:07.839000Zi-campbellhttps://forge.codesys.com/u/i-campbell/https://forge.codesys.comd3ce3c7c1167256d321b8fd10c8ebe485afc4c7e

<div class="markdown_content"><p>Upper_Bound(my_array,1) - Lower_Bound(my_array,1) + 1</p></div>

2020-04-25T19:51:16.968000Z2020-04-25T19:51:16.968000Zlucaver89https://forge.codesys.com/u/lucaver89/https://forge.codesys.com81f96a70e35daa2b89be962040300aedfd829b33

<div class="markdown_content"><p>Hi to all,</p> <p>I've a little problem with the operator sizeof that is not working with in_out vars. In my case the code is very simple like below:</p> <div class="codehilite"><pre><span></span><span class="n">FUNCTION_BLOCK</span> <span class="n">fb1</span> <span class="n">VAR_IN_OUT</span> <span class="n">my_array</span> <span class="p">:</span><span class="nb">ARRAY</span><span class="p">[</span><span class="o">*</span><span class="p">]</span> <span class="k">OF</span> <span class="n">STRING</span><span class="p">;</span> <span class="n">END_VAR</span> <span class="n">VAR_OUTPUT</span> <span class="n">dimension</span> <span class="p">:</span><span class="n">UINT</span><span class="p">;</span> <span class="n">END_VAR</span> <span class="n">VAR</span> <span class="n">END_VAR</span> <span class="n">dimension</span> <span class="p">:</span><span class="o">=</span> <span class="n">sizeof</span><span class="p">(</span><span class="n">my_array</span><span class="p">)</span><span class="o">/</span><span class="n">sizeof</span><span class="p">(</span><span class="n">my_array</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span> </pre></div> <div class="codehilite"><pre><span></span><span class="n">PROGRAM</span> <span class="n">PLC_PRG</span> <span class="n">VAR</span> <span class="n">array1</span> <span class="p">:</span><span class="nb">ARRAY</span><span class="p">[</span><span class="mi">0</span><span class="p">..</span><span class="mi">100</span><span class="p">]</span> <span class="k">OF</span> <span class="n">STRING</span><span class="p">;</span> <span class="n">pi</span> <span class="p">:</span><span class="n">fb1</span><span class="p">;</span> <span class="n">dim1</span><span class="p">,</span> <span class="n">dim2</span> <span class="p">:</span><span class="n">UINT</span><span class="p">;</span> <span class="n">END_VAR</span> <span class="n">pi</span><span class="p">(</span><span class="n">my_array</span> <span class="p">:</span><span class="o">=</span> <span class="n">pi</span><span class="p">,</span> <span class="n">dimension</span><span class="o">=&gt;</span><span class="n">dim1</span><span class="p">);</span> <span class="n">dim2</span> <span class="p">:</span><span class="o">=</span> <span class="n">SIZEOF</span><span class="p">(</span><span class="n">array1</span><span class="p">)</span><span class="o">/</span><span class="n">SIZEOF</span><span class="p">(</span><span class="n">array1</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span> </pre></div> <p>In this case the result of dim1 is zero, and the result of dim2 is 101. How can I calculate the right dimension from function block?</p> <p>thanks<br/> Luca</p></div>