Backspace keycode hex code detecting

Getting Started
1

I am again confused about how to get a list of keycodes or how to use them.

I cannot find a listing of the Keycodes for Chr values used in Keydown.
If I look up in Keyboard the value of backspace, I get “33” which is a hex value.
At the bottom of the table is AsyncKeyDown which should not be used in Keydown or I have it wrong.
If I put Chr(33) in KeyDown(If Key = Chr(33) Then MessageBox "backspace") I don’t have it right. The value is 08, and I don’t know where that table is.
If I look up AsyncKeyDown it shows it reads an integer, but the example uses hex.

Where is a listing of appropriate values for Keydown with appropriate examples?

2

Backdelete is CTRL-H or character 08 on an ascii chart

3

Sorry. I am on a Mac and then I hit Delete.
When l read the value in the debugger it’s 08 and the key is reported as binary, which I thought meant hex. The value in Keyboard for Delete is 75 then.
What is it?
How do I find this table for XOJO for Ascii keyCodes with Keyboard?

I also write XOJO because sometimes we have our own values.

4

08 in hex = 08 in decimal

backspace (the back delete right next to the += key on a us keyboard) is 08
forward delete on an extended us keyboard (near fn end etc) is a different “character”

iu
iu920×690 36.2 KB

key CODE rely on what kind of keyboard is in use though and will NOT be consistent as noted on http://documentation.xojo.com/api/hardware/keyboard.html
the CODE is more like “you pressed key 75”, which with certain layouts may be the backspace key or ANY OTHER as they keymap is defined.
So on a french keyboard it might be something different and on a german keyboard something else but its al lthe same physical key that was pressed

5

Yes. This part I understand from experience. Particularly the international part.

What I don’t understand is why Keyboard doesn’t show the Ascii table but instead shows a hex value which I don’t know what that is.

A hex value of 75 (delete) should be usable but I can’t figure out how.

What is that table used for?

The Ascii list is found under TextEncoding

6

75 would be for the forward-delete key. Presumably this is what you want:

if  (Keyboard.AsyncKeyDown(51))  Then   // 33 hex is 51 decimal
// do something, Backspace pressed.
End if

I assume ASCII isn’t used in this business because many keys don’t have ASCII values (e.g., End, PageDown, …)

7

The values in Keyboard are completely different from the values passed to KeyDown. The values in KeyDown are from the ASCII chart.