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POForm tells wrong size on Windows 8 — how to get real size?
 

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  1. POForm tells wrong size on Windows 8 — how to get real size?
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    <p>Having a WinForms form with form border style set to <code>Sizable</code> on Windows 8, the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.form.desktopbounds.aspx" rel="nofollow noreferrer"><code>DesktopBounds</code> property</a> tells the correct values:</p> <p><img src="https://i.stack.imgur.com/mQYgy.png" alt="enter image description here"></p> <p>In contrast, when having a form border style of <code>FixedDialog</code>, the values are wrong:</p> <p><img src="https://i.stack.imgur.com/FTQKm.png" alt="enter image description here"></p> <p>On Windows XP, the values are always correct:</p> <p><img src="https://i.stack.imgur.com/peX0B.png" alt="enter image description here"></p> <p><img src="https://i.stack.imgur.com/A6ymH.png" alt="enter image description here"></p> <p><strong>My question is:</strong></p> <p>How to get the real size of a Window including the complete non-client area?</p> <p><strong>Update 1:</strong></p> <p>Seems that it is related to <a href="https://stackoverflow.com/questions/3192232/getwindowrect-too-small-on-windows-7">this SO question</a>. I'll try and see whether this would solve my issue here, too.</p> <p><strong>Update 2:</strong></p> <p>Just for completeness, here are the results from a VMware Windows 7:</p> <p><img src="https://i.stack.imgur.com/IyXaE.png" alt="enter image description here"></p> <p><img src="https://i.stack.imgur.com/6qTxT.png" alt="enter image description here"></p> <p><strong>Update 3:</strong></p> <p>Finally found a solution which involves using the <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa969515%28v=vs.85%29.aspx" rel="nofollow noreferrer"><code>DwmGetWindowAttribute</code> function</a> together with the <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa969530%28v=vs.85%29.aspx" rel="nofollow noreferrer"><code>DWMWA_EXTENDED_FRAME_BOUNDS</code> value</a>. I'll post an answer below.</p>
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    1. USUwe Keim
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    1. COIf you look closely, Windows XP exhibits the same behavior. It's just that the Windows borders are a single pixel wide rather than the five pixels in Windows 8 (the difference in XP between Fixed and Sizable is 2 whereas it is 10 in Windows 8).
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      1. POForm tells wrong size on Windows 8 — how to get real size?
      1. USJustin Niessner
    2. COwhat gives you the assumption the size is wrong? if you have a look at the Visual Studio designer while you change the `FormBorderStyle` you will actually see it shrink
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      1. USMoslem Ben Dhaou
    3. CO@JustinNiessner Yes, I do see that; still the dimensions returned by the Windows XP version actually reflect the real form size, whereas on Windows 8, they do not.
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      1. USUwe Keim
 

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