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POUSB Device Removal in Windows 8
 

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  1. POUSB Device Removal in Windows 8
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    <p>I've got the following code the detect the arrival and removal of a Prolific Serial based USB Device.</p> <pre><code> protected override void WndProc(ref Message m) { DBT changeType = (DBT)m.WParam; string portName; if (m.Msg == WM_DEVICECHANGE)// &amp;&amp; changeType != DBT.OTHER) { switch (changeType) { case DBT.DEVICEREMOVAL: portName = Marshal.PtrToStringAuto((IntPtr)((long)m.LParam + 12)); // Device Removal break; case DBT.DEVICEARRIVAL: portName = Marshal.PtrToStringAuto((IntPtr)((long)m.LParam + 12)); // Device Arrival break; } } base.WndProc(ref m); } enum DBT { DEVICEARRIVAL = 0x8000, DEVICEREMOVAL = 0x8004, OTHER = 0x0007, } </code></pre> <p>My problem is that it seems as if the Removal event never gets sent in Windows 8? This code works for WinXp, Win2000, Vista &amp; Win7, perfectly.</p> <p>After monitoring the messages while plugging and removing the device, it seems as if Win8 never passes the correct removal message? </p> <p>Here are the results under Win8:</p> <p>Detection:</p> <pre><code>HWnd=1770298, LParam=0, WParam=7, Result=0, Msg=537 HWnd=1770298, LParam=98820448, WParam=32768, Result=0, Msg=537 HWnd=1770298, LParam=0, WParam=7, Result=0, Msg=537 </code></pre> <p>Removal:</p> <pre><code>HWnd=1770298, LParam=0, WParam=7, Result=0, Msg=537 </code></pre> <p>What I'm expecting:</p> <p>Detection:</p> <pre><code>HWnd=590440, LParam=0, WParam=7, Result=0, Msg=537 HWnd=590440, LParam=1241588, WParam=32768, Result=0, Msg=537 HWnd=590440, LParam=0, WParam=7, Result=0, Msg=537 </code></pre> <p>Removal:</p> <pre><code>HWnd=590440, LParam=0, WParam=7, Result=0, Msg=537 HWnd=590440, LParam=1241588, WParam=32772, Result=0, Msg=537 </code></pre> <p>This last message never arrives in Win8??</p>
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    1. USJan de Jager
    1. USJan de Jager
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    1. COIs ANY event triggered? - Put a BP in your WmdProc method to see if ANYTHING happens...
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      1. POUSB Device Removal in Windows 8
      1. USFaraday
    2. COSee edits above...
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      1. POUSB Device Removal in Windows 8
      1. USJan de Jager
    3. COI've got the same problem. WM_DEVICECHANGE coming, but only with code DBT_DEVNODES_CHANGED. Googling this problem lead me to this post. My issue is detecting of USB serial device arrival and removal to safely open/close serial port and allocate/free resources. Some people told that replacement of PretranslateMessage to direct message map solves this problem in Vista/7, but I can't check it for my Qt 5.1 project as I use overriden "nativeEvent" method.
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      1. POUSB Device Removal in Windows 8
      1. USaiss83
 

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