Re: A problem about CHtmlView::Navigate2

From:

"AliR $VC++ MVP$" <AliR@online.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 08 Aug 2007 15:12:07 GMT

Message-ID:

<b3lui.1237$3x.205@newssvr25.news.prodigy.net>

I think you should wait for the first Navigate2 to compete before you issue
the next one. Earlier I read that you don't want to use OnNavigateComplete2.

Here is an alternative:

    //navigate to url
   m_pHTMLView->Navigate2(Filename);

    //don't let the function go any further until the page load is done
   while (m_pHTMLView->GetReadyState() != READYSTATE_COMPLETE)
   {
      ((CMyApp *)AfxGetApp())->Yeild();
   }

    //the loading is done, do something with the page. (In my case I called
m_pHTMLView->OnFilePrint)

void CMyApp::Yeild()
{
MSG Msg;

   while (PeekMessage(&Msg,NULL,0,0,PM_REMOVE))
   {
      if (!PreTranslateMessage(&Msg))
      {
         TranslateMessage(&Msg);
         DispatchMessage(&Msg);
      }
   }
}

AliR.

"Tom Lee" <Tom.Lee@community.nospam> wrote in message
news:BC70C71D-74E5-4133-850A-E2E1FC0EB120@microsoft.com...

I found if I call the CHtmlView::Navigate2 very quickly, it will hang the
process.

I made a tiny MDI application to verify this problem. The CTestHVViewis
derived from CHtmlView.
In the application, I created a timer on CTestHVView::OnInitialUpdate, and
call Navigate2 to a xml file in the OnTimer function.

The application will will hang. From the call stack, it is hanged in
msxml3.dll.

Here is some codes for reference:
class CTestHVView : public CHtmlView
{
...
protected:
vector<CString> m_vctFullPath;
vector<CString>::iterator m_curIter;
...
};

void CTestHVView::OnInitialUpdate()
{
CHtmlView::OnInitialUpdate();

//Get the XML files full path and put them into a vector.
TCHAR szPath[MAX_PATH*4];
ZeroMemory(szPath, MAX_PATH*4);
GetCurrentDirectory(MAX_PATH*4, szPath);
CString csDir(szPath);
csDir += _T("\\XML\\");
CString csTmp(csDir+_T("*.xml"));

WIN32_FIND_DATA FindFileData;
HANDLE hFind;
hFind = FindFirstFile(csTmp, &FindFileData);
if (INVALID_HANDLE_VALUE == hFind)
{
return;
}

OutputDebugString(_T("++++++++Use the following XML to test+++++++\n"));
do{
m_vctFullPath.push_back(csDir+FindFileData.cFileName);
OutputDebugString(csDir+FindFileData.cFileName+_T("\n"));
}while(FindNextFile(hFind, &FindFileData));
FindClose(hFind);
OutputDebugString(_T("++++++++Use the above XML to test+++++++\n"));

m_curIter = m_vctFullPath.begin();
this->SetTimer(1, 10, NULL);
}

void CTestHVView::OnTimer(UINT nIdEvent)
{
static int nMax = 1000;
static int i = 0;
if (++i > nMax)
{
KillTimer(1);
i = 0;
return;
}
if (0 == m_vctFullPath.size())
{
KillTimer(1);
i = 0;
return;
}
if (m_curIter == m_vctFullPath.end())
{
m_curIter = m_vctFullPath.begin();
}
this->Navigate2(*m_curIter, NULL, NULL);
CString cs;
cs.Format(_T("i = %d, Navigate2 %s\n"), i, *m_curIter);
OutputDebugString(cs);
m_curIter++;
}

//Use this function to tigger the nvaigate2 again.
void CTestHVView::OnRunAgain()
{
SetTimer(1, 10, NULL);
}

Any comments are very appreciated!
Thanks,

--
Tom Lee