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Detect keys down on application startup?

Posted on 2010-11-09
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Last Modified: 2012-05-10
Hi,

I have written in C#. I would like the application to start in a "support mode" if the user is holding down Ctrl+Shift+S when the application starts.

As I need to detect the "support mode" keys before the application starts (i.e. the main form loads), I can't do it on the keydown event of the main form. This is because some of the things on the main form get initialised differently in support mode.

I can't find a way of getting the current keys pressed without responding to events.

How can I do this?
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Question by:JimR123b
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by:cyberkiwi
ID: 34091979
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by:cyberkiwi
ID: 34091988
In there, you could set up a singleton GlobalConfig class that contains members that you want to init.
Your main form can then also reference the singleton, e.g. GlobalConfig.GetSingleton.somesetting
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by:JimR123b
ID: 34091998
How do I get the current state of the keys pressed?

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cyberkiwi earned 250 total points
ID: 34092057
http://www.switchonthecode.com/tutorials/winforms-accessing-mouse-and-keyboard-state

Ctrl-Shift-S :

if((Control.ModifierKeys == (Keys.Control | Keys.Shift)) && Keyboard.IsKeyDown(Keys.S))
{
  //Do stuff here
}
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Author Comment

by:JimR123b
ID: 34092119
I perhaps should have said, I'm using .Net Framework 3.5.

It appears that the Keyboard class is .Net 4?... http://msdn.microsoft.com/en-us/library/system.windows.input.keyboard.iskeydown.aspx

That's the kind of thing I'm looking for, but for .Net 3.5.

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by:cyberkiwi
ID: 34092132
Please see the above link.
The class is created in the link, for pre .Net 4.
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Author Comment

by:JimR123b
ID: 34092134
...Also, I can't use Control.ModifierKeys because I don't have a handle on a control yet, as it is needed before the main form is created.
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Expert Comment

by:cyberkiwi
ID: 34092144
Control is a static reference to the Control class, not an instance of a control.
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Author Comment

by:JimR123b
ID: 34092185
Ah, I see. I did try code completion on "Control." to see what came up, and it only came up with a few things, none of which were "ModifierKeys". I've tried it in another class now, and I see "ModifierKeys" :)

...but how do I get the state of Keys.S without the Keyboard class? Is there something similar in Control?

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Author Comment

by:JimR123b
ID: 34092212
Sorry, didn't see the definition of the class Keyboard in http://www.switchonthecode.com/tutorials/winforms-accessing-mouse-and-keyboard-state

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by:cyberkiwi
ID: 34092215
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