Best way to make screenlock/keylock?   

Hello,

Is it possible to lock screen and keys and unlock them with an unlock 
method.....have no idea for that.....thx    juvi

date: Mon, 7 Jul 2008 09:28:03 -0700   author:   juvi

RE: Best way to make screenlock/keylock?   

If the device supports key lock you could force a keyboard event:

keybd_event(0x85, 0, 0, 0);

 [DllImport("coredll.dll", EntryPoint = "keybd_event", SetLastError = true)]
        internal static extern void keybd_event(byte bVk, byte bScan, int 
dwFlags, int dwExtraInfo);

See the key codes here: http://msdn.microsoft.com/en-us/library/bb431750.aspx

There might be a better way, but this works as I just tested it on my devices.

-- 
Simon Hart
Visual Developer - Device Application Development MVP
http://simonrhart.blogspot.com


"juvi" wrote:

> Hello,
> 
> Is it possible to lock screen and keys and unlock them with an unlock 
> method.....have no idea for that.....thx    juvi

date: Wed, 9 Jul 2008 00:31:00 -0700   author:   Simon Hart [MVP]

Re: Best way to make screenlock/keylock?   

You can also use the GAPI. Theres a function called GXOpenInput() and 
GXCloseInput().

GXCloseInput -  Turns on the unfiltered button message mode. All hardware 
button presses generate appropriate WM_KEY messages to the application and 
are not sent to the shell.

GXOpenInput - returns button-press messages to their filtered mode.

You can call it from managed code by:

    public static bool LockHardwareButtons() {
      try {
        GXOpenInput();
        return true;
      }
      catch (MissingMethodException) {
        return false;
      }
    }

    public static bool UnlockHardwareButtons() {
      try {
        GXCloseInput();
        return true;
      }
      catch (MissingMethodException) {
        return false;
      }
    }

    [DllImport("gx.dll", EntryPoint = "#9")]
    private static extern int GXOpenInput();

    [DllImport("gx.dll", EntryPoint = "#3")]
    private static extern int GXCloseInput();

-- 
Best Regards,
Christian R. Helle
http://christian-helle.blogspot.com

"Simon Hart [MVP]"  wrote in message 
news:89BA5921-6993-4DE5-B3C0-769D2088BFF9@microsoft.com...
> If the device supports key lock you could force a keyboard event:
>
> keybd_event(0x85, 0, 0, 0);
>
> [DllImport("coredll.dll", EntryPoint = "keybd_event", SetLastError = 
> true)]
>        internal static extern void keybd_event(byte bVk, byte bScan, int
> dwFlags, int dwExtraInfo);
>
> See the key codes here: 
> http://msdn.microsoft.com/en-us/library/bb431750.aspx
>
> There might be a better way, but this works as I just tested it on my 
> devices.
>
> -- 
> Simon Hart
> Visual Developer - Device Application Development MVP
> http://simonrhart.blogspot.com
>
>
> "juvi" wrote:
>
>> Hello,
>>
>> Is it possible to lock screen and keys and unlock them with an unlock
>> method.....have no idea for that.....thx    juvi

date: Mon, 14 Jul 2008 11:40:56 +0200   author:   Christian R. Helle

Re: Best way to make screenlock/keylock?   

One thing to bear in mind is that GAPI (since WM5) has been marked as 
deprecated and replaced with DDraw and will eventually be removed from future 
releases of WM. I don't think DDraw allows for input.
-- 
Simon Hart
Visual Developer - Device Application Development MVP
http://simonrhart.blogspot.com


"Christian R. Helle" wrote:

> You can also use the GAPI. Theres a function called GXOpenInput() and 
> GXCloseInput().
> 
> GXCloseInput -  Turns on the unfiltered button message mode. All hardware 
> button presses generate appropriate WM_KEY messages to the application and 
> are not sent to the shell.
> 
> GXOpenInput - returns button-press messages to their filtered mode.
> 
> You can call it from managed code by:
> 
>     public static bool LockHardwareButtons() {
>       try {
>         GXOpenInput();
>         return true;
>       }
>       catch (MissingMethodException) {
>         return false;
>       }
>     }
> 
>     public static bool UnlockHardwareButtons() {
>       try {
>         GXCloseInput();
>         return true;
>       }
>       catch (MissingMethodException) {
>         return false;
>       }
>     }
> 
>     [DllImport("gx.dll", EntryPoint = "#9")]
>     private static extern int GXOpenInput();
> 
>     [DllImport("gx.dll", EntryPoint = "#3")]
>     private static extern int GXCloseInput();
> 
> -- 
> Best Regards,
> Christian R. Helle
> http://christian-helle.blogspot.com
> 
> "Simon Hart [MVP]"  wrote in message 
> news:89BA5921-6993-4DE5-B3C0-769D2088BFF9@microsoft.com...
> > If the device supports key lock you could force a keyboard event:
> >
> > keybd_event(0x85, 0, 0, 0);
> >
> > [DllImport("coredll.dll", EntryPoint = "keybd_event", SetLastError = 
> > true)]
> >        internal static extern void keybd_event(byte bVk, byte bScan, int
> > dwFlags, int dwExtraInfo);
> >
> > See the key codes here: 
> > http://msdn.microsoft.com/en-us/library/bb431750.aspx
> >
> > There might be a better way, but this works as I just tested it on my 
> > devices.
> >
> > -- 
> > Simon Hart
> > Visual Developer - Device Application Development MVP
> > http://simonrhart.blogspot.com
> >
> >
> > "juvi" wrote:
> >
> >> Hello,
> >>
> >> Is it possible to lock screen and keys and unlock them with an unlock
> >> method.....have no idea for that.....thx    juvi 
>

date: Mon, 14 Jul 2008 02:48:01 -0700   author:   Simon Hart [MVP]