isprint

[Jaga]

1.)
I am using C#. Is there any similar function to isprint in C?

2.)
If I trap the event OnKeyDown in a Control, I become a
System.Windows.Forms.KeyEventArgs.
How can I determine whether the key in the KeyEventArgs a printable char is?

Thanks in advance

Jaga

[Ed Courtenay]

I think you'll find that Char.IsControl() will do what you're after.

public static void Main() {
char c = '\t'; \\ Tab character

Console.WriteLine(Char.IsControl(c));
}
"Jaga" <ja***@web.de> wrote in message
news:us**************@TK2MSFTNGP12.phx.gbl...

1.)
I am using C#. Is there any similar function to isprint in C?

2.)
If I trap the event OnKeyDown in a Control, I become a
System.Windows.Forms.KeyEventArgs.
How can I determine whether the key in the KeyEventArgs a printable char is?
Thanks in advance

Jaga

[Ed Courtenay]

You could also use the Char.GetUnicodeCategory function();

public static void Main() {
char c = '\t';

Console.WriteLine("Character is printable: {0}",
Char.GetUnicodeCategory(c) != UnicodeCategory.Control);
}
"Jaga" <ja***@web.de> wrote in message
news:us**************@TK2MSFTNGP12.phx.gbl...

1.)
I am using C#. Is there any similar function to isprint in C?

2.)
If I trap the event OnKeyDown in a Control, I become a
System.Windows.Forms.KeyEventArgs.
How can I determine whether the key in the KeyEventArgs a printable char is?
Thanks in advance

Jaga

[Jaga]

Thank you Ed.
It means all the character, which is NOT IsControl is a printable
character?

I 'd like to test it. Does anybody knows how can I convert
System.WindowsForms.Keys.Left in a char?

Thanks

Jaga


"Ed Courtenay" <re*****************************@edcourtenay.co.uk > schrieb
im Newsbeitrag news:uI**************@TK2MSFTNGP09.phx.gbl...

You could also use the Char.GetUnicodeCategory function();

public static void Main() {
char c = '\t';

Console.WriteLine("Character is printable: {0}",
Char.GetUnicodeCategory(c) != UnicodeCategory.Control);
}
"Jaga" <ja***@web.de> wrote in message
news:us**************@TK2MSFTNGP12.phx.gbl...

1.)
I am using C#. Is there any similar function to isprint in C?

2.)
If I trap the event OnKeyDown in a Control, I become a
System.Windows.Forms.KeyEventArgs.
How can I determine whether the key in the KeyEventArgs a printable char

is?

Thanks in advance

Jaga

[Dmitriy Lapshin [C# / .NET MVP]]

Jaga,

This keystroke does not produce a character at all - I am pretty sure the
KeyPress event either is not raised for this keystroke, or the Char property
value in the passed KeyPressedEventArgs instance does not contain a valid
value.

To summarize, you should distinguish characters and keystrokes. Not every
keystroke can produce a character, and not every Unicode character can be
produced by a keystroke given current keyboard layout and input locale
(except for tricks like Alt followed by digit keys on the numeric
("calculator-layout") keyboard pad).

--
Dmitriy Lapshin [C# / .NET MVP]
X-Unity Test Studio
http://www.x-unity.net/teststudio.aspx
Bring the power of unit testing to VS .NET IDE

"Jaga" <ja***@web.de> wrote in message
news:OQ**************@TK2MSFTNGP09.phx.gbl...

Thank you Ed.
It means all the character, which is NOT IsControl is a printable
character?

I 'd like to test it. Does anybody knows how can I convert
System.WindowsForms.Keys.Left in a char?

Thanks

Jaga


"Ed Courtenay" <re*****************************@edcourtenay.co.uk > schrieb
im Newsbeitrag news:uI**************@TK2MSFTNGP09.phx.gbl...

You could also use the Char.GetUnicodeCategory function();

public static void Main() {
char c = '\t';

Console.WriteLine("Character is printable: {0}",
Char.GetUnicodeCategory(c) != UnicodeCategory.Control);
}
"Jaga" <ja***@web.de> wrote in message
news:us**************@TK2MSFTNGP12.phx.gbl...

1.)
I am using C#. Is there any similar function to isprint in C?

2.)
If I trap the event OnKeyDown in a Control, I become a
System.Windows.Forms.KeyEventArgs.
How can I determine whether the key in the KeyEventArgs a printable

char is?

Thanks in advance

Jaga

[Jaga]

Thank you Dmitriy.
You are right, the KeyPress event is raised only if the keystroke a
printable character ist.
But it is too late for me. I must already trap the event KeyDown or the
PreProcessMessage.
How can I determine whether the key in the KeyEventArgs of the KeyDown event
a printable char is? The framework can do it, it raises the KeyPress event
only for such characters.
Jaga

"Dmitriy Lapshin [C# / .NET MVP]" <x-****@no-spam-please.hotpop.com> schrieb
im Newsbeitrag news:er**************@TK2MSFTNGP09.phx.gbl...

Jaga,

This keystroke does not produce a character at all - I am pretty sure the
KeyPress event either is not raised for this keystroke, or the Char property value in the passed KeyPressedEventArgs instance does not contain a valid
value.

To summarize, you should distinguish characters and keystrokes. Not every
keystroke can produce a character, and not every Unicode character can be
produced by a keystroke given current keyboard layout and input locale
(except for tricks like Alt followed by digit keys on the numeric
("calculator-layout") keyboard pad).

--
Dmitriy Lapshin [C# / .NET MVP]
X-Unity Test Studio
http://www.x-unity.net/teststudio.aspx
Bring the power of unit testing to VS .NET IDE

"Jaga" <ja***@web.de> wrote in message
news:OQ**************@TK2MSFTNGP09.phx.gbl...

Thank you Ed.
It means all the character, which is NOT IsControl is a printable
character?

I 'd like to test it. Does anybody knows how can I convert
System.WindowsForms.Keys.Left in a char?

Thanks

Jaga


"Ed Courtenay" <re*****************************@edcourtenay.co.uk > schrieb

im Newsbeitrag news:uI**************@TK2MSFTNGP09.phx.gbl...

You could also use the Char.GetUnicodeCategory function();

public static void Main() {
char c = '\t';

Console.WriteLine("Character is printable: {0}",
Char.GetUnicodeCategory(c) != UnicodeCategory.Control);
}
"Jaga" <ja***@web.de> wrote in message
news:us**************@TK2MSFTNGP12.phx.gbl...
> 1.)
> I am using C#. Is there any similar function to isprint in C?
>
> 2.)
> If I trap the event OnKeyDown in a Control, I become a
> System.Windows.Forms.KeyEventArgs.
> How can I determine whether the key in the KeyEventArgs a printable

char is?
>
> Thanks in advance
>
> Jaga
>
>