HTMLDocument without HTML Agility Pack

Question

I'm working on a third party program called "Encompass 360" and I'm very confined to the limits of their SDK. With that said, they make use of MSHTML to draw up forms (hence why I can't utilize HAP.) This has been a very frustrating process.

I want to create my own form that is more dynamic than what they offer from their "form builder".

The definition they provide for us to use it:

public void AttachToDocument(HTMLDocument document, FormOptions option)

I'm trying this:

        HTMLDocument htpanel = pnlHTML.HTMLElement.document as HTMLDocument;
        htpanel.open();
        htpanel.createElement("Form");
        htpanel.createTextNode("Just some text");
        htpanel.createAttribute("P");
        htpanel.write(new object[] { "<P>Please work.</P>" });
        htpanel.close();
        htpanel.body.innerHTML = ("<SCRIPT type=\"text/javascript\">Alert(\"HI\");</SCRIPT>");
        try
        {
            htpanel.body.outerHTML = ("<BODY id=pnlHTML1 contentEditable=false style=\"BORDER-TOP: 0px inset; BORDER-RIGHT: 0px inset; BORDER-BOTTOM: 0px inset; BORDER-LEFT: 0px inset; VISIBILITY: inherit\" controlType=\"Class1\"></BODY>");
        }catch(Exception ex)
        {
            wf.MessageBox.Show(ex.Message.ToString());
        }
        htpanel.bgColor = Color.Black;
        this.Form.AttachToDocument(htpanel, FormOptions.None);

With the code above, "htpanel.write()" causes a COMException with the error of "Type Mismatch". I've tried many different ways I've found searching and can't get past this.

Can someone please point me in the right direction?

Check this post (https://stackoverflow.com/questions/5170078/net-document-write-with-mshtml) — Ryan Wilson, May 13 '18 at 19:39

score 0 · Answer 1 · answered May 13 '18 at 23:49

The post Ryan linked (.net document write with mshtml) put me in the right direction. For Anyone else who may come down this path: I passed the control as an mshtml htmldocument to a different method which allowed the use of "IHTMLDocument2" and its .write method which actually works.

Code is below:

First method that assigns one of Encompass' controls as a true HTMLDocument,

        HTMLDocument htpanel = pnlHTML.HTMLElement.document as HTMLDocument;
        var add2form = doc(htpanel);
        this.Form.AttachToDocument(add2form, FormOptions.None);

Second method is what does the conversion and casts the control back.

       public HTMLDocument doc(HTMLDocument panel)
       {
        IHTMLDocument2 doc2 = (IHTMLDocument2)panel;
        doc2.bgColor = Color.Black;
        doc2.title = "my_title";
        doc2.write(new object[] { "<p>a</p>" });
        doc2.close();
        return (HTMLDocument)doc2;
       }

Thank you.

HTMLDocument without HTML Agility Pack

1 Answers1