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POCreate a dialog in UI Thread causes crash
 

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    <p>I tried to create a dialog in a UI thread(CWinThread). However, it crashes when the CDialog::Create() is called. I had verified with previous implementation, the dialog is successfully created in non-threading mode.</p> <p>Does any guru here know the crash reason of creating a dialog in CWinThread?</p> <p>Without Threading:</p> <pre><code>class CProduction : public CDialog{ ... } class CScrollProductionView : public CScrollView{ CProduction *m_pProduction; ... } void CScrollProductionView::OnInitialUpdate(){ m_pProduction = new CProduction(0, *m_pVisionAdapter); m_pProduction-&gt;Create(IDD_DLG_PROD, this); //--&gt; created dialog successfully m_pProduction-&gt;ShowWindow(SW_SHOW); } </code></pre> <p>Implement UI Thread:</p> <pre><code>class CProduction : public CDialog{ ... } class CScrollProductionView : public CScrollView{ CProductionThread* m_pProdThread; ... } class CProductionThread : public CWinThread{ CProduction *m_pProduction; ... } void CScrollProductionView::OnInitialUpdate(){ m_pProdThread-&gt;PostThreadMessage(WM_INITPRODTHREADMESSAGE, PROD_INIT, (LPARAM)m_pVisionAdapter); m_pProdThread-&gt;PostThreadMessage(WM_INITPRODTHREADMESSAGE, PROD_CREATE_DLG, (LPARAM)this); } void CProductionThread::InitMessageHandler(WPARAM wParam, LPARAM lParam) { printf("Receiving InitMessageHandler msg %d\n", (UINT)wParam); switch(wParam) { case PROD_INIT: { CVisionAdapter* pAdapter = (CVisionAdapter*)lParam; m_pProduction = new CProduction(NULL, *pAdapter); } break; case PROD_CREATE_DLG: { CScrollProductionView* pView = (CScrollProductionView*)lParam; m_pProduction-&gt;Create(IDD_DLG_PROD, pView); //--&gt; Crash here m_pProduction-&gt;ShowWindow(SW_SHOW); } break; default: break; } } </code></pre> <p>Error message: </p> <blockquote> <p>Debug Assertion Failed! ..<br> File: .... wincore.cpp<br> Line: 9906</p> </blockquote> <p>Thanks you for viewing this question.</p>
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    1. USwengseng
    1. USwengseng
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    1. COWhat is the assertion on line 9906 of your wincore.cpp? Often times the assertion code itself or a nearby comment give a big clue as to what is wrong.
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      1. USTheUndeadFish
 

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