在C＃中获取鼠标光标速度

Question

I was sucecssful regarding changing the mouse speed with C# with the help of this article: http://www.sparrowtail.com/changing-mouse-pointer-speed-c .

Now I also want to get the current mouse speed. I tried to change const uint SPI_GETMOUSESPEED to 0x0072 and also to 0x0070 hoping that this would be the right adress. Microsoft documentation says that the adress (at least in C++) is 0x70 however it is not possbile for me to get the right adress on the internet.

My function:

private int GetMouseSpeed()
    {

        const uint SPI_GETMOUSESPEED = 0x0070;
        uint mouseSpeed = 0;

        SystemParametersInfo
        (
            SPI_GETMOUSESPEED,
            0,
            mouseSpeed,
            0
        );

        return (int) mouseSpeed;
    }

Answer 1

You can find all possible values of uiAction on the MSDN . SPI_GETMOUSESPEED value is 0x70 . Plus, you need to pass pointer to an integer that receives a value. In the code below I did it using the unsafe & operator. In order to compile it, you need to check Allow unsafe context in the build settings of your project.

public const UInt32 SPI_GETMOUSESPEED = 0x0070;

[DllImport("User32.dll")]
static extern Boolean SystemParametersInfo(
    UInt32 uiAction,
    UInt32 uiParam,
    IntPtr pvParam,
    UInt32 fWinIni);

static unsafe void Main(string[] args)
{
    int speed;
    SystemParametersInfo(
        SPI_GETMOUSESPEED,
        0,
        new IntPtr(&speed),
        0);
    Console.WriteLine(speed);
}