How do i make a A Switch that needs a key or a custom item?

So how do i make that?
I tried diffrent ways to make it but it didnt work.
Please help!

i'm not preatty sure, but it depends on the format you're doing your level and what you what the switch to do.

Im useing UDMF Format
And i want the switch to open the door.

In UDMF in GZDoomBuilder, when you open linedef Properties, there is a "Lock number" property which lets you set a lock type, which will make the linedef impossible to be activated unless the player has the respective key(s) - so, give the linedef any "Action" you want (with an appropriate "Activation" type in the box below) and set its lock type to something. There are predefined lock types for keys from the original game(s). To create custom lock types, see LOCKDEFS.

Plus how do i make the Powercubeholder hold the power cube and open the door?
Power cube is found in Realm667

The power cube wad has a test map in it. You should look into that if you want to know how it works.

I cant see a test map i opend it with slade

GloryToRussia said:

I cant see a test map i opend it with slade

You need to download the file from here: http://www.realm667.com/index.php/en/kunena/closed-submissions/706-submission-power-cube#4069

Then What does mean this? on the script editor?
Case 2: // open doors
Door_Open(5, 16);
Break;
}
}

What do i do with the 5 and 16

EDIT:I dosent show me Item number what do i do with it?

GloryToRussia said:

Then What does mean this? on the script editor?
Case 2: // open doors
Door_Open(5, 16);
Break;
}
}

It means:

comment line said:

// open doors

GloryToRussia said:

What do i do with the 5 and 16

??
Nothing?
http://zdoom.org/wiki/Door_Open

GloryToRussia said:

EDIT:I dosent show me Item number what do i do with it?

I don't understand what this last sentence means.
Item number is the number that tell the puzzle what item to use.
http://zdoom.org/wiki/UsePuzzleItem
In power cube decorate this is defined as "1" (see line 28 in the decorate).

The Item Number Says this