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    <p>Here's the VB6 version:</p> <pre><code>Private Sub DHTMLEdit1_onkeypress() Dim e As Object Set e = DHTMLEdit1.DOM.parentWindow.event 'Perform smart-quote replacement' Select Case e.keyCode Case 34: 'Double-Quote' e.keyCode = 0 If IsAtWordEnd Then InsertDoubleUndo ChrW$(8221), ChrW$(34) Else InsertDoubleUndo ChrW$(8220), ChrW$(34) End If Case 39: 'Single-Quote' e.keyCode = 0 If IsAtWordEnd Then InsertDoubleUndo ChrW$(8217), ChrW$(39) Else InsertDoubleUndo ChrW$(8216), ChrW$(39) End If End Select End Sub Private Function IsLetter(ByVal character As String) As Boolean IsLetter = UCase$(character) &lt;&gt; LCase$(character) End Function Private Sub InsertDoubleUndo(VisibleText As String, HiddenText As String) Dim selection As Object Set selection = DHTMLEdit1.DOM.selection.createRange() selection.Text = HiddenText selection.moveStart "character", -Len(HiddenText) selection.Text = VisibleText End Sub Private Function IsAtWordEnd() As Boolean Dim ch As String ch = PreviousChar IsAtWordEnd = (ch &lt;&gt; " ") And (ch &lt;&gt; "") End Function Private Function PreviousChar() As String Dim selection As Object Set selection = m_dom.selection.createRange() selection.moveStart "character", -1 PreviousChar = selection.Text End Function </code></pre> <p>Note: this solution inserts an additional level in the undo chain. For example, typing "This is a test" gives a chain of “This is a test” -> “This is a test" -> <strong>“This is a test</strong> -> “ -> " (extra level in bold). To remove this extra level you'd have to implement some sort of <code>PostMessage+subclassing</code> solution that doesn't involve cancelling the native keypress</p> <p>edit: Don't forget to include the <a href="http://www.microsoft.com/downloads/details.aspx?familyid=b769a4b8-48ed-41a1-8095-5a086d1937cb&amp;displaylang=en" rel="noreferrer">DHTML Editing Control redistributable</a> if you are targeting Windows Vista.</p>
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    1. POCode to make a DHTMLEd control replace straight quotes with curly quotes
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    1. COWow! Thanks! Well done! Worked the first time. I'll still tweak it a tiny bit to handle a few weird cases, but this is terrific.
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    2. COBy the way, I love the implementation of IsLetter()... a true programming pearl!
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    3. COThanks for the praise; never thought I'd hear something like that from a programming legend :) Regarding IsLetter: Use IsCharAlphaW or another unicode-aware method instead. My implementation was quick and dirty so as not to detract from the meat of my answer :)
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