Why does GetParentFrame() cause an error in my thread?

[timmay3141]

I have a thread in which I need to constantly update a dialog bar of my SDI app. The update function works fine when not called in my thread, but it crashes when the thread calls it. Here's my thread, minus irrelivent code:

UINT CModelView::HandleThread(LPVOID lp)
{
CModelView* pView = (CModelView*)lp;
while(pView->m_bRunning)
{
if(something)
pView->UpdateDlgBar();
//do other stuff
}

return 0;
}

I traced the actual error to when I call GetParentFrame() in UpdateDlgBar, which is one of the first things I do. Anyway, why does this cause an error, and how can I fix it?

 

[Zyrenthian]

There are a few possible solutions. One is to create a UI thread and the other is to post messages back to the window to update from your thread. I have tried the UI thread approach but it did not work with our current code implimentation. I found the UI threads a bit difficult to use (but as I said, it could just be the way our code is.)

<Matt