Topic: HidSharp: Occasional ArgumentException thrown by HidManager.GetDevices
Hi,
My details:
Windows 7 64-bit
HidSharp: 1.5
.NET Framework 4 Client Profile
Building a 32-bit WinForms program
I'm hitting an intermittent ArgumentException in HidManager.GetDevices. The following line in that method:
lock (_deviceList) { _deviceList.Add(addition_, device); }occasionally throws an ArgumentException saying that the key already exists. My set up is a WinForms program that has the following method in the form class:
private const int WM_DEVICECHANGE = 0x0219;
private const int DBT_DEVNODES_CHANGED = 0x0007;
protected override void WndProc(ref Message m)
{
if (m.Msg == MainForm.WM_DEVICECHANGE && m.WParam.ToInt32() == DBT_DEVNODES_CHANGED)
{
HidDeviceLoader loader = new HidDeviceLoader();
foreach (HidDevice device in loader.GetDevices())
{
// Do something
}
}
}This code can be triggered multiple times in rapid succession which might be relevant. If I run my program and repeatedly plug and unplug a USB device eventually the ArgumentException occurs.
I added some Console.WriteLines to HidManager.GetDevices which produced the following output. It appears that something else is modifying _deviceList between the start of GetDevices and the point at which _deviceList.Add is called. Maybe there are threads still running from a previous call to GetDevices, I'm not sure:
_deviceList.Keys (start of GetDevices):
\\?\hid#vid_1e7d&pid_2e22&mi_00&col01#7&1d798885&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_01&col01#7&1f93e0c0&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_051d&pid_0002#6&145c4476&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_01&col02#7&1f93e0c0&0&0001#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_00#7&7d0547b&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col02#7&1d798885&0&0001#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col03#7&1d798885&0&0002#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col04#7&1d798885&0&0003#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_01#7&30a9a4c3&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
devices (after catching the ArgumentException):
\\?\hid#vid_045e&pid_028e&ig_00#7&1f6318a&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_00#7&7d0547b&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_01&col01#7&1f93e0c0&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_01&col02#7&1f93e0c0&0&0001#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_051d&pid_0002#6&145c4476&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col01#7&1d798885&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col02#7&1d798885&0&0001#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col03#7&1d798885&0&0002#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col04#7&1d798885&0&0003#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_01#7&30a9a4c3&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
additions (after catching the ArgumentException):
\\?\hid#vid_045e&pid_028e&ig_00#7&1f6318a&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
removals (after catching the ArgumentException):
_deviceList.Keys:
\\?\hid#vid_045e&pid_028e&ig_00#7&1f6318a&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col01#7&1d798885&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_01&col01#7&1f93e0c0&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_051d&pid_0002#6&145c4476&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_01&col02#7&1f93e0c0&0&0001#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_04d9&pid_1818&mi_00#7&7d0547b&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col02#7&1d798885&0&0001#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col03#7&1d798885&0&0002#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_00&col04#7&1d798885&0&0003#{4d1e55b2-f16f-11cf-88cb-001111000030}
\\?\hid#vid_1e7d&pid_2e22&mi_01#7&30a9a4c3&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
addition_ (after catching the ArgumentException):
\\?\hid#vid_045e&pid_028e&ig_00#7&1f6318a&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}I've worked around this problem in my code now so it's not an issue for me but I thought I would report the problem anyway. To Zer: thank you for HidSharp, other than this one issue it has been absolutely perfect, just what I was looking for.