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POHow to write an localized on-screen-keyboard
 

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    <p>I have to write an on screen keyboard for our company's program, which is mostly used on industry's PCs with touch capability.</p> <p>We can't use the windows default keyboard because we don't need all keys on the keyboard. So I was asked to write a custom one in C#.</p> <p>I already found <a href="http://www.siao2.com/2006/04/22/581107.aspx" rel="nofollow">this blog</a> as reference, but I'm not sure how to start.</p> <p>I created a small prototype GUI and assign for each key a scancode, and translate these scancodes to the related character. And send them to the active control. But I'm not sure what scancodes I should use.</p> <p>So my question is, is that the correct way to write a OSK like this and if yes which scancodes should I use? Any links?</p> <p>I'm also not sure how to handle the <kbd>shift</kbd> states...</p> <p><strong>Edit:</strong></p> <p>Okay I did a bit more research and came up with a osk which reads the current keyboard layout and even handles the easy <kbd>shift</kbd> states (<kbd>Shift</kbd> and <kbd>Alt Gr</kbd>). I wrote a <code>KeyButton</code> class which inherits from <code>Button</code>, this <code>KeyButton</code> has a <code>ScanCode</code> property of type byte and if you assign a valid scancode to it, the <code>KeyButton</code> will call the related functions to get the correct text. I used the functions from Michael Kaplan blogs with some small changes. In the end it turned out that I just had to do the same as he did.</p> <p>So the answer to my question is: Yes, you have to use scancodes on your buttons and then get the virtualkey and the unicode from the keyboard layout. <a href="http://www.win.tue.nl/~aeb/linux/kbd/scancodes-1.html" rel="nofollow">Use these scancodes.</a></p> <p>Now I get the characters the only thing left is to send these around.</p>
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    1. COIs this OSK for generic usage or specifically for a given software? (I.e. will you feed scan codes to the windows event bus or send char codes to a winforms app?) The difference is huge.
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    2. COFor our software, so I want to send char codes to a textbox. But I want to use the keyboard layout like the default osk in windows.
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    3. COWhat about dead keys?
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