Question

I want to create rows and cells in the CDHtmlDialog. Here is the code my wrote:

void CHtmlTableTestDlg::OnDocumentComplete(LPDISPATCH pDisp, LPCTSTR szUrl)
{
    IHTMLTable* table;
    this->GetElement(_T("Table"),(IHTMLElement**)&table); 
    IDispatch* dispatch;
    table->insertRow(1,&dispatch);
}

Here is the html of the table:

<table id="Table">
    <tr>
        <th>Column</th>
    </tr>
</table>

I debugged the project and got the error below when execute “table->insertRow(1,&dispatch)”

Unhandled exception at 0x3fa53780 in HtmlTableTest.exe: 0xC0000005: Access violation writing location 0x00000001.

I have uploaded my test project:
http://top720.com/Temp/HtmlTableTest.zip

How to create rows and cells base on the CDHtmlDialog?

Thank you for any helps in in advance.

Answer 1

You can’t just cast between IHTMLElement and IHTMLTable. Try this:

IHTMLElement* element;
if(S_OK == this->GetElement(_T("Table"),(IHTMLElement**)&element)) {
   IHTMLTable* table;
   if(S_OK == element->QueryInterface(&table)) {
      IDispatch* dispatch;
      table->insertRow(1,&dispatch);
      table->Release();
      table = NULL;
   }
}

It would also be worth reading an introduction to COM.