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<div>Oooh yes, you are right.</div>
<div><span class="tlid-translation translation"><span>I knew this procedure</span></span>, but I have forgotten it totally.</div>
<div>thanks</div>
<p>Il 06.08.2019 14:32 ML ha scritto:</p>
<blockquote type="cite" style="padding-left:5px; border-left:#1010ff 2px solid; margin-left:5px; width:100%"><!-- html ignored --><!-- head ignored --><!-- meta ignored -->On 6/8/19 08:05, <a class="moz-txt-link-abbreviated" href="mailto:vuott@tiscali.it">vuott@tiscali.it</a> wrote:<br />
<blockquote type="cite" style="padding-left:5px; border-left:#1010ff 2px solid; margin-left:5px; width:100%"><!-- meta ignored -->
<div>Hello,</div>
<div>I don’t understand why at the second reading of a Structure array I always get the value of the last element.</div>
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<pre class="moz-quote-pre"><code class="hljs php"><span class="hljs-keyword">Public</span> Struct AAAA b <span class="hljs-keyword">As</span> Byte c <span class="hljs-keyword">As</span> Short i <span class="hljs-keyword">As</span> Integer End Struct Public Sub Main() Dim a <span class="hljs-keyword">As</span> <span class="hljs-keyword">New</span> AAAA Dim aa <span class="hljs-keyword">As</span> <span class="hljs-keyword">New</span> AAAA[] Dim i <span class="hljs-keyword">As</span> Integer <span class="hljs-keyword">For</span> i = <span class="hljs-number">0</span> To <span class="hljs-number">7</span> aa.Push(a) Valorizza(i, aa[i]) <span class="hljs-keyword">Print</span> aa[i].b, <span class="hljs-string"> ' first</span> <span class="hljs-string"> Next</span> <span class="hljs-string">Print</span> <span class="hljs-string">Print</span> <span class="hljs-string"> For i = 0 To 7</span> <span class="hljs-string"> Print aa[i].b, '</span> second Next End Private Procedure Valorizza(c <span class="hljs-keyword">As</span> Integer, s <span class="hljs-keyword">As</span> AAAA) s.b = <span class="hljs-number">4</span> * c End</code>
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Looks like all the structs in the array refer (i.e: they're pointers) to the same 'a' struct in the first DIM.<br /> Therefore, when you change the value in ANY element, you end up changing it in all elements just because they're all pointing to the same original 'a'.<br /><br /> Change the first DIM to this:<br />
<pre><code class="hljs php"> Dim a <span class="hljs-keyword">As</span> AAAA </code></pre>
and alter the first FOR as follows:<br />
<pre><code class="hljs php"> <span class="hljs-keyword">For</span> i = <span class="hljs-number">0</span> To <span class="hljs-number">7</span> a = New AAAA 'New line. This makes 'a' point to a new, different structure in memory in each pass aa.Push(a) 'continue your original code here </code></pre>
That fixes it.<br /><br /> zxMarce.</blockquote>
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