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Usin ProcessCmdKey correctly

P: n/a
I have been overriding the ProcessCmdKey in my forms because I want to
handle some keystrokes that seem to disappear if I try to use the regular
key handling events. It seems to be working just fine, but there are some
things I don't understand, and I could use some advice.

1) The ProcessCmdKey takes a Windows message, and I feel like I should be
filtering for just one of the key messages (although to my surprise, I'm not
getting the behavior multiple times even though I don't filter on the
message.) So should I be checking the message? And if so, how do you do it
in C#? In C++, you seem to have enums over Windows Messages just available,
I supposed from some .h that is always included & I never think about, but I
don't know if they are available in C# or how to get them.

2) What is the affect of the return value? I have always been returning true
if I do something with a keystroke, but I don't know what that means?

3) I've been handling these things at the form level, but I really want them
to do stuff to a particular control (whether or not that control has focus.)
Is that really necessary, or could a control that doesn't have focus receive
message through its ProcessCmdKey? Something I read somewhere gave me the
idea that might be possible, but I'm having trouble understanding any of it.

Nov 16 '05 #1
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