Programmatically change custom mouse cursor in windows?

You can do like this. Get the Cursor.cur file to load custom cursor. On MouseLeave set the Default cursor for form. 

public static Cursor ActuallyLoadCursor(String path)
    {
        return new Cursor(LoadCursorFromFile(path));
    }

    [DllImport("user32.dll")]
    private static extern IntPtr LoadCursorFromFile(string fileName);

Button btn = new Button();
btn.MouseLeave += Btn_MouseLeave;
btn.Cursor = ActuallyLoadCursor("Cursor.cur");

private static void Btn_MouseLeave(object sender, EventArgs e)
    {
        this.Cursor = Cursors.Default;
    }

If you want to change the default Mouse Cursor theme:

enter image description here

You can just change it in the registry:

There are three main registry keys that come into play.

  1. The registry key HKEY_CURRENT_USER\Control Panel\Cursors contains the active user cursors

1a) The values underneath this are the different types of cursors
1b) The Scheme Source specifies the type of cursor scheme that is currently being used.

The different values are:

"0" – Windows Default
"1" – User Scheme
"2" – System Scheme

  1. The registry key HKEY_CURRENT_USER\Control Panel\Cursors contains the user defined cursor schemes (i.e. Scheme Source = 1)

  2. The registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Control Panel\Schemes contains the system cursor schemes (i.e. Scheme Source = 2)

enter image description here

If you already changed the path to one of the cursor type in HKCU\Control Panel\Cursors and realized that it did not do anything. You are correct, just updating a key – HKCU\Control Panel\Cursors\Arrow, for instance – isn’t enough. You have to tell windows to load the new cursor.

This is where the SystemParametersInfo call comes in. To try this out let’s go ahead and change HKCU\Control Panel\Cursors\Arrow to C:\WINDOWS\Cursors\appstar3.ani (assuming you have this icon) and then make a call to SystemParametersInfo.

In AutoHotKey Script:

SPI_SETCURSORS := 0x57
result := DllCall("SystemParametersInfo", "UInt", SPI_SETCURSORS, "UInt", 0, "UInt", 0, "UInt", '0')
MsgBox Error Level: %ErrorLevel% `nLast error: %A_LastError%`nresult: %result%

Translated to C#:

[DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]
public static extern bool SystemParametersInfo(uint uiAction, uint uiParam, uint pvParam, uint fWinIni);
 
const int SPI_SETCURSORS = 0x0057;
const int SPIF_UPDATEINIFILE = 0x01;
const int SPIF_SENDCHANGE = 0x02;

To call it:

SystemParametersInfo(SPI_SETCURSORS, 0, 0, SPIF_UPDATEINIFILE | SPIF_SENDCHANGE);

Changing to the Default Windows Cursor

Now the tricky part. If you look at HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Control Panel\Schemes you will notice that “Windows Default” is defined as “,,,,,,,,,,,,,” or in other words no pointers to actual cursors!

What to do now? Don’t worry. All you have to do is set the different cursor types to empty string and then make the SystemParametersInfo call as usual. In fact, you can set any of the cursor type to empty string in any scheme and Windows will default it to it’s equivalent in the “Windows Default” scheme.

REF:

https://thebitguru.com/articles/programmatically-changing-windows-mouse-cursors/3

https://social.msdn.microsoft.com/Forums/vstudio/en-US/977e2f40-3222-4e13-90ea-4e8d0cdf289c/faq-item-how-to-change-the-systems-cursor-using-visual-cnet?forum=csharpgeneral

Tags:

C#

Cursors

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