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    <p>You should use the <a href="http://msdn.microsoft.com/en-us/library/ms645502%28v=VS.85%29.aspx"><code>MapDialogRect()</code></a> function.</p> <p>Pass in a <code>RECT</code> in dialog units, and the equivalent <code>RECT</code> in pixel units is returned. Note that you need a handle to a dialog in order to give <code>MapDialogRect()</code> sufficient context. The function needs to know the font in order to perform the conversion.</p> <hr> <p>In case you are tempted to use <a href="http://msdn.microsoft.com/en-us/library/ms645475"><code>GetDialogBaseUnits()</code></a>, remember what Raymond Chen said, <a href="http://blogs.msdn.com/b/oldnewthing/archive/2004/02/17/74811.aspx">GetDialogBaseUnits is a crock</a>.</p> <blockquote> <p>As you can guess from the title of this entry, GetDialogBaseUnits is a crock. Since there is no HWND parameter to GetDialogBaseUnits, it doesn't know which dialog box's DLUs you want to retrieve. So it guesses.</p> <p>And it always guesses wrong.</p> <p>GetDialogBaseUnits returns the dialog base units for dialog boxes that use the default system font. But nobody uses the default system font any more. It screams "old and dorky". But it remains the default for compatibility reasons. (And therefore so too does GetDialogBaseUnits.)</p> </blockquote> <p>If you have to calculate pixel dimensions from DLUs, and you don't have a handle to a dialog, then you must use the method outlined here: <a href="http://support.microsoft.com/kb/125681">How To Calculate Dialog Base Units with Non-System-Based Font</a></p> <hr> <p>However, you made it clear in the comments that, for your problem, you do not actually need to convert from DLUs to pixels. You can use Delphi's built in form scaling to ensure that your forms are sized appropriately for the prevailing font scaling.</p>
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    1. POHow to convert DLU into pixels?
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    1. USDavid Heffernan
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    1. POHow to convert DLU into pixels?
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    1. COThis function requires the Dialog's HWND, but what if my window is not a dialog? Can I get some standard dialog's HWND somewhere in the system?
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    2. COdialog units are meaningless without a context. You have to have a dialog.
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      1. USDavid Heffernan
    3. COSimple example: I want to set the size of my command buttons to the standard height. Standard height = 14 DLU. I don't have any dialog window in my app. :(
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