Modifying a function

Posted on 2006-11-15
Last Modified: 2013-11-20
Hi guys,

I have a function which calls JavaScript functions via C++ code, but now need to modify it so that:

1/ I can define which JavaScript function I want to call, via a Parameter when calling this function.
2/ I can send up to 5 Parameters to the JavaScript Function via Paramters sent when calling this function.

Anybody able to help me out please?

Here is the code at the moment:

#import "C:\\windows\\system32\mshtml.tlb"   // **you need this !

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,
Question by:Cyber-Drugs
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LVL 22

Accepted Solution

mahesh1402 earned 500 total points
ID: 17953678

 You need to take reference of  this article : 

Refer function CallJScript(const CString strFunc, const CStringArray& paramArray) <== here you can pass paramArray which is array of parameters as string.. you can pass any no. of parameters to this function.

Either you may think to use above function as it is ...or you can modify your existing function with reference of this funciton.

Modifie function will look like this :

#import "C:\\windows\\system32\mshtml.tlb"  

// function name and string array as parameters
void CCustomModalDialog::ExecuteScriptFunction(const CString strFunc,  const CStringArray& paramArray)

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

  IDispatchPtr spScript(spDoc->GetScript());

 CComBSTR bstrMember(strFunc);
  DISPID dispid = NULL;
  HRESULT hr = spScript->GetIDsOfNames(IID_NULL,&bstrMember,1,   LOCALE_SYSTEM_DEFAULT,&dispid);

    return false;
  const int arraySize = paramArray.GetSize();
  //Putting parameters  
  DISPPARAMS dispparams;
  memset(&dispparams, 0, sizeof dispparams);
  dispparams.cArgs      = arraySize;
  dispparams.rgvarg     = new VARIANT[dispparams.cArgs];
  dispparams.cNamedArgs = 0;
  for( int i = 0; i < arraySize; i++)
    CComBSTR bstr = paramArray.GetAt(arraySize - 1 - i); // back reading
    dispparams.rgvarg[i].vt = VT_BSTR;
  EXCEPINFO excepInfo;
  memset(&excepInfo, 0, sizeof excepInfo);
  CComVariant vaResult;
  UINT nArgErr = (UINT)-1;  // initialize to invalid arg
  //Call JavaScript function        
  hr = spScript->Invoke(dispid,IID_NULL,0, DISPATCH_METHOD,&dispparams, &vaResult,&excepInfo,&nArgErr);
  delete [] dispparams.rgvarg;

    return false;

  return vaResult;


Author Comment

ID: 17954314

Thanks for the fast reply, just to check though, would I also be able to send an array over to a JavaScript function as a parameter?

LVL 22

Expert Comment

ID: 17954437
In above function its a provision implementged to accept paramteres using CStringArray.. you are suppose to pass parameters in this array as strings.


Author Comment

ID: 17954463
Thanks mahesh1402, that's great! :)

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