How do I use Rundll32 to swapmousebutton?

Question

I'm repeating a question from another forum, as I'd like the same answer.

From MSDN's SwapMouseButton Function.

How do I pass boolean data from command prompt through rundll32.exe to a boolean type argument in a command running from user32.dll?

I'm trying to run this from CMD (the command prompt)

RUNDLL32.EXE user32.dll,SwapMouseButton *

Where the asterisk is here is where the argument should go. I already ran it without an argument and it swapped my left and right mouse buttons (seems TRUE is the default entry for the boolean argument). Now I want to undo it. However I've tried each of these for passing FALSE in the argument, and none have worked (none set my mouse buttons back to normal).

• F
• f
• false
• False
• FALSE
• "false"
• "False"
• "FALSE"
• 0
• -1

Please help me pass the argument as needed. Thanks in advance.

Answer 1

Thanks so much for the C# solution. It worked like a charm.

I made a slight alteration so that I could simply click on a desktop short-cut to toggle the primary mouse button, without passing in arguments. In case my approach helps someone else, here is that version:

using System.Runtime.InteropServices;
using System;

class SwapMouse
{
    [DllImport("user32.dll")]
    public static extern Int32 SwapMouseButton(Int32 bSwap);

    static void Main(string[] args)
    {
        int rightButtonIsAlreadyPrimary = SwapMouseButton(1);
        if (rightButtonIsAlreadyPrimary != 0)
        {
            SwapMouseButton(0);  // Make the left mousebutton primary
        }
    }
}