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Tuesday, November 10, 2009

CDHtmlDialog crash while updating frequently



/*
when using CDHtmlDialog to navigate a page frequently
and changing content and refresh it will crash in
ieframe.dll or mshtml.dll.

To avoid crash check browser busy state
before navigating a file in CDHtmlDialog

*/


//sample code to navigating html file

void CMYDHtmlDialog::NavigateFile()
{
CString csFilePath;
csFilePath = "c:\\sample.html";

//wait for 1 second if not loaded or in busy state
if( FALSE == WaitTillLoaded (1000) )
return;

Navigate(csFilePath, NULL, NULL);

}


//sample code to wait till page lode in browser
BOOL CMYDHtmlDialog::WaitTillLoaded (int nTimeout)
{
READYSTATE result;
DWORD nFirstTick = GetTickCount ();

do
{
m_pBrowserApp->get_ReadyState (&result);

if (result != READYSTATE_COMPLETE)
Sleep (50);

if (nTimeout > 0)
{
if ((GetTickCount () - nFirstTick) > nTimeout)
break;
}
} while (result != READYSTATE_COMPLETE);

if (result == READYSTATE_COMPLETE)
return TRUE;
else
return FALSE;
}


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