Best way to make screenlock/keylock?

  • Thread starter Thread starter juvi
  • Start date Start date
J

juvi

Hello,

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

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

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