82 lines
3.8 KiB
Python
82 lines
3.8 KiB
Python
# Demo RegisterDeviceNotification etc. Creates a hidden window to receive
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# notifications. See serviceEvents.py for an example of a service doing
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# that.
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import sys, time
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import win32gui, win32con, win32api, win32file
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import win32gui_struct, winnt
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# These device GUIDs are from Ioevent.h in the Windows SDK. Ideally they
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# could be collected somewhere for pywin32...
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GUID_DEVINTERFACE_USB_DEVICE = "{A5DCBF10-6530-11D2-901F-00C04FB951ED}"
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# WM_DEVICECHANGE message handler.
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def OnDeviceChange(hwnd, msg, wp, lp):
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# Unpack the 'lp' into the appropriate DEV_BROADCAST_* structure,
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# using the self-identifying data inside the DEV_BROADCAST_HDR.
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info = win32gui_struct.UnpackDEV_BROADCAST(lp)
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print("Device change notification:", wp, str(info))
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if wp==win32con.DBT_DEVICEQUERYREMOVE and info.devicetype==win32con.DBT_DEVTYP_HANDLE:
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# Our handle is stored away in the structure - just close it
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print("Device being removed - closing handle")
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win32file.CloseHandle(info.handle)
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# and cancel our notifications - if it gets plugged back in we get
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# the same notification and try and close the same handle...
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win32gui.UnregisterDeviceNotification(info.hdevnotify)
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return True
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def TestDeviceNotifications(dir_names):
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wc = win32gui.WNDCLASS()
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wc.lpszClassName = 'test_devicenotify'
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wc.style = win32con.CS_GLOBALCLASS|win32con.CS_VREDRAW | win32con.CS_HREDRAW
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wc.hbrBackground = win32con.COLOR_WINDOW+1
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wc.lpfnWndProc={win32con.WM_DEVICECHANGE:OnDeviceChange}
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class_atom=win32gui.RegisterClass(wc)
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hwnd = win32gui.CreateWindow(wc.lpszClassName,
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'Testing some devices',
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# no need for it to be visible.
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win32con.WS_CAPTION,
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100,100,900,900, 0, 0, 0, None)
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hdevs = []
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# Watch for all USB device notifications
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filter = win32gui_struct.PackDEV_BROADCAST_DEVICEINTERFACE(
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GUID_DEVINTERFACE_USB_DEVICE)
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hdev = win32gui.RegisterDeviceNotification(hwnd, filter,
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win32con.DEVICE_NOTIFY_WINDOW_HANDLE)
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hdevs.append(hdev)
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# and create handles for all specified directories
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for d in dir_names:
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hdir = win32file.CreateFile(d,
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winnt.FILE_LIST_DIRECTORY,
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winnt.FILE_SHARE_READ | winnt.FILE_SHARE_WRITE | winnt.FILE_SHARE_DELETE,
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None, # security attributes
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win32con.OPEN_EXISTING,
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win32con.FILE_FLAG_BACKUP_SEMANTICS | # required privileges: SE_BACKUP_NAME and SE_RESTORE_NAME.
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win32con.FILE_FLAG_OVERLAPPED,
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None)
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filter = win32gui_struct.PackDEV_BROADCAST_HANDLE(hdir)
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hdev = win32gui.RegisterDeviceNotification(hwnd, filter,
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win32con.DEVICE_NOTIFY_WINDOW_HANDLE)
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hdevs.append(hdev)
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# now start a message pump and wait for messages to be delivered.
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print("Watching", len(hdevs), "handles - press Ctrl+C to terminate, or")
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print("add and remove some USB devices...")
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if not dir_names:
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print("(Note you can also pass paths to watch on the command-line - eg,")
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print("pass the root of an inserted USB stick to see events specific to")
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print("that volume)")
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while 1:
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win32gui.PumpWaitingMessages()
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time.sleep(0.01)
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win32gui.DestroyWindow(hwnd)
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win32gui.UnregisterClass(wc.lpszClassName, None)
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if __name__=='__main__':
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# optionally pass device/directory names to watch for notifications.
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# Eg, plug in a USB device - assume it connects as E: - then execute:
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# % win32gui_devicenotify.py E:
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# Then remove and insert the device.
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TestDeviceNotifications(sys.argv[1:])
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