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Assertion Failed (trying to call JavaScript function)

Posted on 2006-11-28
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Last Modified: 2013-11-20
Hi guys,

I am trying to call a JavaScript function, but I got an error which said Debug Assetion Failed, anyone able to help me out please?

Here's the function:



/////////////////////////////////////////////////////////////////////////////
// CCustomModalDialog ExecuteScriptFunction

void CCustomModalDialog::ExecuteScriptFunction()
{
  // m_WebBrowser is an instance of IWebBrowser2
  MSHTML::IHTMLDocument2Ptr spDoc(m_browser.GetDocument());

  if (spDoc)
  {
     IDispatchPtr spDisp(spDoc->GetScript());
     if (spDisp)
     {
        // Evaluate is the name of the script function.
         
        OLECHAR FAR* szMember = L"evaluate";
        DISPID dispid;

        HRESULT hr = spDisp->GetIDsOfNames(IID_NULL, &szMember, 1,
                                       LOCALE_SYSTEM_DEFAULT, &dispid);

        if (SUCCEEDED(hr))
        {
           COleVariant vtResult;
           static BYTE parms[] = VTS_BSTR;

           COleDispatchDriver dispDriver(spDisp, FALSE);

           dispDriver.InvokeHelper(dispid, DISPATCH_METHOD, VT_VARIANT,
                                   (void*)&vtResult, parms,
                                   "5+Math.sin(9)");
        }
     }
  }
}

Cheers!
0
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Question by:Cyber-Drugs
  • 7
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9 Comments
 
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Accepted Solution

by:
mahesh1402 earned 500 total points
Comment Utility
Because I think your browser is not having piece of javascript code with 'evaluate' function. Note that 'evaluate' is custom javascript function which calls javascript eval() function as per this article : http://support.microsoft.com/kb/q185127/

your brwoser should have following piece of HTML code :

<HTML>
  <HEAD>
    <TITLE>Evaluate</TITLE>

    <SCRIPT>
      function evaluate(x)
      {
         alert("hello")
         return eval(x)
      }
   </SCRIPT>
  </HEAD>

  <BODY>
  </BODY>
</HTML>


-MAHESH
0
 
LVL 4

Author Comment

by:Cyber-Drugs
Comment Utility
I tested the code on the following page and still get the Assertion erorr:



<html>
      <head>
            <script>
                  function evaluate(x)
      {
         alert("hello");
         return eval(x);
      }
            
                  function ExitSystem ()
                  {
                        window.external.CB_CallJS(); // Calls ExecuteScriptFunction()
                  }
            </script>
      </head>
      <body>
            <input type='button' value='click me' onclick='ExitSystem();' />
      </body>
</html>
0
 
LVL 4

Author Comment

by:Cyber-Drugs
Comment Utility
Just a thought, but do I maybe need to tell it the name of the Web Browser Element on my C++ Form?
0
 
LVL 22

Expert Comment

by:mahesh1402
Comment Utility
Webbrowser control 'm_browser' should have above piece of HTML code.
0
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LVL 4

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by:Cyber-Drugs
Comment Utility
That's the right one...

Want me to upload the project to ee-stuff.com and maybe you can see what is going wrong?
0
 
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Author Comment

by:Cyber-Drugs
Comment Utility
I just ran a debug, and it's falling over on this line:


MSHTML::IHTMLDocument2Ptr spDoc(m_browser.GetDocument());
0
 
LVL 4

Author Comment

by:Cyber-Drugs
Comment Utility
Just added an if statement on m_browser, and it seems it doesn't exist...

How would I go about populating it with whatever it needs?
0
 
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Author Comment

by:Cyber-Drugs
Comment Utility
I did a check, and it is being declared:


      //{{AFX_DATA(CCustomModalDialog)
      enum { IDD = IDD_MODAL_DIALOG };
      CWebBrowser2      m_browser;
      //}}AFX_DATA



It's just not working, I think if I can get it to work, then the JavaScript call will work. Ideas please?
0
 
LVL 4

Author Comment

by:Cyber-Drugs
Comment Utility
OK fixed it!!

It was something extremely stupid...

some pages were m_browser and others were m_Browser

Once I standardized that, it worked!!!!


Cheers mahesh1402 !
0

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