Programmatically press "Right Shift" Key

Question

I'm having trouble with finding a way on how to press specifically a right shift key programmatically. I need a single key down and up (press/release).

What I have is:

SendKeys.Send("{RSHIFT}")

And I know that shift is like:

SendKeys.Send("+")

Which is just shift key, I suppose, but I need specifically a right shift key.

Could, someone, please, help me with this code?

Answer 1

Using the keybd_event you don't need window handle

VB :

Public Class MyKeyPress
    <DllImport("user32.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)>
    Public Shared Sub keybd_event(ByVal bVk As UInteger, ByVal bScan As UInteger, ByVal dwFlags As UInteger, ByVal dwExtraInfo As UInteger)
    End Sub


    ' To find other keycodes check bellow link
    ' http://www.kbdedit.com/manual/low_level_vk_list.html
    Public Shared Sub Send(key As Keys)
        Select Case key
            Case Keys.A
                keybd_event(&H41, 0, 0, 0)
            Case Keys.Left
                keybd_event(&H25, 0, 0, 0)
            Case Keys.LShiftKey
                keybd_event(&HA0, 0, 0, 0)
            Case Keys.RShiftKey
                keybd_event(&HA1, 0, 0, 0)
            Case Else
                Throw New NotImplementedException()
        End Select
    End Sub
End Class

C#:

public static class MyKeyPress
{
    [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
    public static extern void keybd_event(uint bVk, uint bScan, uint dwFlags, uint dwExtraInfo);


    // To get other key codes check bellow link
    // http://www.kbdedit.com/manual/low_level_vk_list.html
    public static void Send(Keys key)
    {
        switch (key)
        {
            case Keys.A:
                keybd_event(0x41, 0, 0, 0);
                break;
            case Keys.Left:
                keybd_event(0x25, 0, 0, 0);
                break;
            case Keys.LShiftKey:
                keybd_event(0xA0, 0, 0, 0);
                break;
            case Keys.RShiftKey:
                keybd_event(0xA1, 0, 0, 0);
                break;
            default: throw new NotImplementedException();
        }
    }
}

usage:

MyKeyPress.Send(Keys.LShiftKey)

Answer 2

Found this after some creative keyword combinations

It build down to this for sending keycodes:

Keys key = Keys.RShiftKey;//Right shift key  
SendMessage(Process.GetCurrentProcess().MainWindowHandle, WM_KEYDOWN, (int)key, 1);

I don't know what the use case is here, but be mindful of the window handle parameter being passed: Process.GetCurrentProcess().MainWindowHandle.

This sends the keystroke to itself. If you are trying to send it to another process/program you will need to pass the window handle for that program.