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copied!<p>Pavel's class <code>SetupDiWrap</code> works great, it just needs a few small tweaks for Windows 7. </p> <p>Hopefully, this update will help other people struggling (like me) to get COM port numbers from VCP names in Windows 7.</p> <p>1) The <code>SP_DEVINFO_DATA</code> has changed in Windows 7, the total length is no longer 28 bytes, it is 32 bytes long. This is what works for me:</p> <pre><code> private struct SP_DEVINFO_DATA { /// <summary>Size of the structure, in bytes.</summary> public int cbSize; /// <summary>GUID of the device interface class.</summary> public Guid ClassGuid; /// <summary>Handle to this device instance.</summary> public int DevInst; /// <summary>Reserved; do not use.</summary> public ulong Reserved; } </code></pre> <p>Note ulong for Reserved instead of an int. Changing uint <code>cbSize</code> to int <code>cbSize</code> saved me a cast later on, otherwise you can leave it as uint.</p> <p>2) I also wrote the line:</p> <pre><code> da.cbSize = (uint)Marshal.SizeOf(da); </code></pre> <p>a bit different, for clarity, to get the cbSize to 32 bits:</p> <pre><code>da.cbSize = Marshal.SizeOf(typeof(SP_DEVINFO_DATA)); </code></pre> <p>3) I changed</p> <pre><code> [DllImport("setupapi.dll", CharSet = CharSet.Auto)] static extern IntPtr SetupDiGetClassDevs( ref Guid ClassGuid, IntPtr Enumerator, IntPtr hwndParent, int Flags ); </code></pre> <p>to</p> <pre><code> [DllImport("setupapi.dll", CharSet = CharSet.Auto)] private static extern IntPtr SetupDiGetClassDevs( ref Guid ClassGuid, UInt32 Enumerator, IntPtr hwndParent, UInt32 Flags ); </code></pre> <p>The Enumerator is no longer an <code>IntPtr</code>, so you need to call <code>SetupDiGetClassDevs</code> like this:</p> <pre><code>IntPtr h = SetupDiGetClassDevs(ref guidClone, 0, IntPtr.Zero, DIGCF_PRESENT | DIGCF_PROFILE); </code></pre> <p>Note "0" instead of <code>IntPtr.Zero</code> when passing the Enumerator.</p> <p>The code now runs like a charm in Windows 7!</p>

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