IHTMLInputElement::put_value doesn't set editbox value?

From:

Jingcheng <jchliu2000@gmail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 4 May 2010 00:22:40 -0700 (PDT)

Message-ID:

<2e02ce9c-f186-4bc9-b1c1-c9bafb96564c@40g2000pry.googlegroups.com>

IHTMLInputElement::put_value doesn't set editbox value?

I want to set a the editbox in a html-form.
IHTMLInputElement::put_value returns S_OK, but the text of the
editbox is not set, instead it's just cleared. Can you please help me
take a look?

The following is my C++ code:

  CString filename = _T("C:\\temp\\test.htm");

  _variant_t varFlags(0L);
  _variant_t varMissing(0L);
  m_browser.Navigate(filename, &varFlags, &varMissing, &varMissing,
&varMissing);

  LPUNKNOWN lpUnk = m_browser.GetControlUnknown();
  IWebBrowser2Ptr ipWebCtrl(lpUnk);

  VARIANT_BOOL bBusy = VARIANT_TRUE;
  while (bBusy == VARIANT_TRUE)
    ipWebCtrl->get_Busy(&bBusy);

  IDispatchPtr ipDispatch;
  HRESULT hr = ipWebCtrl->get_Document(&ipDispatch);

  IHTMLDocument2Ptr ipHtmlDoc2(ipDispatch);
  if (!ipHtmlDoc2)
    return;

  IHTMLElementCollectionPtr ipElements;
  ipHtmlDoc2->get_all(&ipElements);

  if (!ipElements)
    return;

  long count = 0;
  ipElements->get_length(&count);

  for(long i = 0; i < count; i++)
  {
    LPDISPATCH lpItem;
    ipElements->item(CComVariant(i), CComVariant(i), &lpItem);

    IHTMLInputElementPtr ipInput(lpItem);
    if(!ipInput)
      continue;

    // Edit-Field?
    BSTR bstrType;
    ipInput->get_type(&bstrType);
    if (CString(bstrType) == "text")
    { // Fill in Text
      CString sTemp (_T("TestVal"));
      BSTR bstrNewValue = sTemp.AllocSysString ();
      ipInput->put_value (bstrNewValue);
      SysFreeString(bstrNewValue);
    }
  }

The following is my test.htm:

<html>

<head>
</head>

<body>

<script language="JScript"></script>

<table border="0" width="60%" align="center">
  <tr>
    <td width="100%">

<form>
  <p><input type="text" name="myEditBox" size="20"> Edit</p>
</form>
<form>
  <p><input type="checkbox" name="myCheck1" value="ON">
Chk1   
  <input type="checkbox" name="myCheck2" value="ON"
checked>Chk2    
  <input type="checkbox" name="myCheck3" value="ON">Chk3</p>
</form>
<form">
  <p><input type="radio" value="V1" checked name="myRadio"> Op1 
<input type="radio" name="myRadio" value="V2">
  Op2   <input type="radio" name="myRadio" value="V3">Op3</
p>
</form>
<form>
  <p><select size="1" name="myDropDown">
    <option selected>Sel 1</option>
    <option>Sel 2</option>
    <option>Sel 3</option>
  </select> Sel</p>
</form>

<form>
  <p align="center"><input type="text" name="userID" size="20"></p>
</form>

<form>
  <p align="center"><input type="button" onclick="GoNext();"
value="Next >>" name="NextBtn"></p>
</form>

    </td>
  </tr>
</table>

</body>

</html>