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POMFC radio buttons - DDX_Radio and DDX_Control behavior
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copied!<p>I have an MFC dialog in which there are two radio buttons. I have put them in a nice group, their IDCs are one after each other (<code>RB_LEFT, RB_RIGHT</code>).</p> <p>I want to use <code>DDX_Radio</code> so I can access the buttons using an integer value so in the function DoDataExchange I call : </p> <pre><code> DDX_Radio(pDX, RB_LEFT, mRBLeftRight); </code></pre> <p>where mRBLeftRight is a member variable of integer type. I also need to edit the buttons properties so I wanted to use a <code>DDX_Control</code> to map them on member variables mRBLeft and mRBRight (CButton):</p> <pre><code> DDX_Control(pDX, RB_LEFT, mRBLeft); DDX_Control(pDX, RB_RIGHT, mRBRight); </code></pre> <p>now if I do the call to <code>DDX_Control</code>, whenever DoDataExchange is called, the application crashes because <code>DDX_Control</code> forces <code>RB_LEFT</code> to handle a message that <code>DDX_Radio</code> cannot handle. This part I understand.</p> <p>I decided to not use <code>DDX_Control</code> (removed the calls in DoDataExchange) and just keep a pointer to my radio buttons (CButton*) in my classes. So in my OnInitDialog function, I do the following calls :</p> <pre><code> mRBLeft= ((CButton*)GetDlgItem(RB_LEFT)); mRBRight = ((CButton*)GetDlgItem(RB_RIGHT)); </code></pre> <p>Now as long as I don't use mRBLeft it's going to be fine, but if I do, bam, crash on DoDataExchange. The thing that really puzzles me is if I change my left radio button using <code>((CButton*)GetDlgItem(RB_LEFT)->SetCheck(true)</code> it's going to work. Sooo what's the difference ?</p> <p>(I know it's a lot of hassle for little, but I just wanna understand the mechanics)</p>

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