DTI-Matt DTI-Matt - 1 year ago 110
C# Question

KeyEventArgs to VirtualKeyCode

I'm trying to make use of the WindowsInputSimulator library to help me simulate keyPresses.

The software will consist of a client and a server. When a key is entered on the Client, it's KeyEventArgs are sent to the Server. The server then does the following with it:

public void SendKeyDown(Keys keyCode, Keys modifiers)
{
uint nonVK = MapVirtualKey((uint)keyCode, 2);
char mappedChar = Convert.ToChar(nonVK);
if (modifiers.Equals(Keys.None))
{
VirtualKeyCode vkc;
if (Enum.TryParse(VkKeyScan(mappedChar).ToString(), out vkc))
{
InputSimulator.SimulateKeyDown(vkc);
}
}
else
{
//Find out which modifier we're working with.
uint modVK = MapVirtualKey((uint)modifiers, 2);
char modifierChar = Convert.ToChar(modVK);
VirtualKeyCode vkc, modVkc;
if (Enum.TryParse(VkKeyScan(mappedChar).ToString(), out vkc)
&& Enum.TryParse(VkKeyScan(modifierChar).ToString(), out modVkc))
{
InputSimulator.SimulateModifiedKeyStroke(modVkc, vkc);
}
}
}


Which works for single keys. However, I'm trying to work with modifier keys as well, and I'm running in to some trouble. For example, pressing SHIFT + K produces "k2" Which leads me to believe either my transation into VirtualKeyCodes is wonky, or something else is.

Also, when sending these commands, should I catch only the KeyDown / KeyUp events? Or should I also watch for the KeyPress event? I should be able to wrok with arrow keys and non-Character keys as well, which makes me think I should just ignore the KeyPress.

EDIT: Also, how would I know when I'm working with multiple modifiers? How should I be stringing them together?

Thoughts? Thanks!

Answer Source

I was able to get it working with the following. Keep in mind this works for a SINGLE modifier, and a single CHARACTER. Special characters don't yet work with this code, but I figure it's a step in the right direction, and answered my immediate question.

    public void SendKey(int keyValue, Keys modifiers)
    {
        VirtualKeyCode key;
        if (modifiers.Equals(Keys.None))
        {
            if (Enum.TryParse(VkKeyScan(((char)keyValue)).ToString(), out key))
            {
                InputSimulator.SimulateKeyDown(key);
                InputSimulator.SimulateKeyUp(key);
            }   
        }
        else if (modifiers.Equals(Keys.Shift) && keyValue >= (int)Keys.A && keyValue <= (int)Keys.Z)
        {
            if (Enum.TryParse(VkKeyScan(((char) keyValue)).ToString(), out key))
            {
                InputSimulator.SimulateModifiedKeyStroke(VirtualKeyCode.SHIFT, key);
            }
        }
        else if (modifiers.Equals(Keys.Control) && keyValue >= (int)Keys.A && keyValue <= (int)Keys.Z)
        {
            if (Enum.TryParse(VkKeyScan(((char)keyValue)).ToString(), out key))
            {
                InputSimulator.SimulateModifiedKeyStroke(VirtualKeyCode.CONTROL, key);
            }
        }
        else if (modifiers.Equals(Keys.Alt) && keyValue >= (int)Keys.A && keyValue <= (int)Keys.Z)
        {
            if (Enum.TryParse(VkKeyScan(((char)keyValue)).ToString(), out key))
            {
                //Alt is named MENU for legacy purposes.
                InputSimulator.SimulateModifiedKeyStroke(VirtualKeyCode.MENU, key);
            }
        }

    }
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