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POHow to detect properly value modifications on a PropertyGrid (MFC)?
 

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  1. POHow to detect properly value modifications on a PropertyGrid (MFC)?
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    <p>I've been developing a program in MFC which fills a PropertyGrid with some data located in a database of mine. One of the fields from this PropertyGrid contains data related to a person's age. Here's the implementation:</p> <pre><code> CMFCPropertyGridProperty * pProp = new CMFCPropertyGridProperty(_T("Age"), (variant_t)PropAge-&gt;GetNext(headAge), _T("This is a description")); pProp-&gt;EnableSpinControl(TRUE, 0, 150); pGroup-&gt;AddSubItem(pProp); </code></pre> <p>Where <code>PropAge</code> is a <code>CList</code> containing the <code>age (integer) of each person's register</code>.</p> <p>Here's my problem: when I try to modify it's value (using the SpinControl or typing another value), the new value does not appear with the bold font. Moreover, when I use the method <code>IsModified()</code>, it returns false:</p> <pre><code>void CPropertiesWnd::DoSomething() { CMFCPropertyGridProperty * PropSel; PropSel = m_wndPropList.GetCurSel(); bool a = PropSel-&gt;GetSubItem(1)-&gt;IsModified(); //SubItem containing the Age data. //Returns False when it's modified! //It always returns 'false', even if //there was made a modification. } </code></pre> <p>I used the Debugger to check what was going on and saw something really interesting:</p> <p><a href="http://img836.imageshack.us/img836/8256/c90j.jpg" rel="nofollow">http://img836.imageshack.us/img836/8256/c90j.jpg</a></p> <p>(Note: <code>m_VarValue</code> represents the current value and <code>m_VarValueOrig</code> represents que value before the modification)</p> <p>as you can see, there is a type difference between the variables <code>m_VarValue</code> and <code>m_VarValueOrig</code>. (What does I4 mean?)</p> <p>I also noted that there are other subitems on this project that also deal with numbers, and they actually show when a modification was made. Their implementation is something like this: </p> <pre><code> pProp = new CMFCPropertyGridProperty(_T("Something"), (_variant_t) 0l, _T("")); </code></pre> <p>What does this 'l' right after the 0 means? Does it have something to do with the I4 type?</p>
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