private void CreateHelperWindow()
{
HelperWindowHandle = User32.CreateWindowEx(
WindowExStyles.WS_EX_OVERLAPPEDWINDOW,
CLASS_NAME,
"Emotion Helper Window",
WindowStyles.WS_CLIPSIBLINGS | WindowStyles.WS_CLIPCHILDREN,
0, 0, 100, 100,
IntPtr.Zero, IntPtr.Zero,
Kernel32.GetModuleHandle(null),
IntPtr.Zero
);
if (HelperWindowHandle == IntPtr.Zero)
{
CheckError("Win32: Failed to create helper window.", true);
}
// HACK: The command to the first ShowWindow call is ignored if the parent
// process passed along a STARTUPINFO, so clear that with a no-op call
User32.ShowWindow(HelperWindowHandle, ShowWindowCommands.SW_HIDE);
// Register for HID device notifications
var dbi = new DevBroadcastDeviceInterfaceW();
dbi.DbccSize = (uint)Marshal.SizeOf(dbi);
dbi.DbccDeviceType = DeviceType.DeviceInterface;
dbi.DbccClassGuid = User32Guids.GuidDevInterfaceHid;
_deviceNotificationHandle = User32.RegisterDeviceNotificationW(HelperWindowHandle, ref dbi, DeviceNotificationFlags.WindowHandle);
CheckError("Registering for device notifications.");
while (User32.PeekMessage(out Message msg, HelperWindowHandle, 0, 0, PeekMessageFlags.PM_REMOVE))
{
User32.TranslateMessage(ref msg);
User32.DispatchMessage(ref msg);
}
Kernel32.SetLastError(0);
CheckError("Creating helper window.");
}
