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POHow do you display a dialog from a hidden window application?
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  1. POHow do you display a dialog from a hidden window application?
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    copied!<p>I have developed a COM component (dll) that implements an Edit() method displaying a WTL modal dialog.</p> <p>The complete interface to this COM component corresponds to a software standard used in the chemical process industry (CAPE-OPEN) and as a result this COM component is supposed to be usable by a range of 3rd party executables that are out of my control.</p> <p>My component works as expected in many of these EXEs, but for one in particular the Edit() method just hangs without the dialog appearing.</p> <p>However, if I make a call to <code>::MessageBox()</code> immediately before <code>DoModal()</code> the dialog displays and behaves correctly after first showing the MessageBox.</p> <p>I have a suspicion that the problem may be something to do with this particular EXE running as a 'hidden window application'.</p> <p>I have tried using both NULL and the return value from <code>::GetConsoleWindow()</code> as the dialog's parent, neither have worked.</p> <p>The dialog itself is an ATL/WTL CPropertySheetImpl.</p> <p>The parent application (EXE) in question is out of my control as it is developed by a (mildly hostile) 3rd party.</p> <p>I do know that I can successfully call <code>::MessageBox()</code> or display the standard Windows File Dialog from my COM component, and that after doing so I am then able to display my custom dialog. I'm just unable to display my custom dialog without first displaying a 'standard' dialog.</p> <p>Can anyone suggest how I might get it to display the dialog without first showing an unnecessary MessageBox? I know it is possible because I've seen this EXE display the dialogs from other COM components corresponding to the same interface.</p>
 

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