About Me
- Name: Sushant Bhatia
- Location: Tempe, Az
I work at CUbiC, the Center for Ubiquitous Computing at ASU. We are developing applications and devices for individuals who are blind. I personally am in charge of developing the iCare BookReader. This device will allow individuals who are blind to have print material read to them. The interface is intuitive and accessible. The process is much faster than using a scanner and our BookReader is quite feature rich. On a personal note, I love coding especially in .Net and C#.
My blog is about coding in .Net and about my interests in general. I love to read, esp Discworld novels by Terry Prattchet. I will post items about work, school, cool stuff and ideas for projects I have. If your ever interested in any of them, let me know as I would love to work on some of them.
Archives
Ankh Morpork's Finest Coder
Wednesday, October 13, 2004
Press "Any Key"
How can I catch keyboard messages on a application-wide basis?
You can implement the IMessageFilter interface in your main form. This amounts to adding an override for PreFilterMessage, and looking for the particular message you need to catch. In the sample, there are two forms, with several controls. You'll notice that no matter what form or control has input focus, the escape key is caught in the PreFilterMessage override.
[C#]
public class MyMainForm : System.Windows.Forms.Form, IMessageFilter{
const int WM_KEYDOWN = 0x100;
const int WM_KEYUP = 0x101;
public bool PreFilterMessage(ref Message m)
{
Keys keyCode = (Keys)(int)m.WParam & Keys.KeyCode;
if(m.Msg == WM_KEYDOWN && keyCode == Keys.Escape)
{
Console.WriteLine("Ignoring Escape...");
return true;
}
return false;
}
....
....
private void MyMainForm_Load(object sender, System.EventArgs e)
{
Application.AddMessageFilter(this);
}
}