How to implement a userdefined cursor in C#?

Question

I want to define my own Cursor as the Current Cursor in my WPF Application, but wenn I try to create a new Cursor Object from my .cur File, I get an Error.

My Code is

     private void NewFile()
    {  ...

      iEvent_dragdrop = (HTMLDocumentEvents2_Event)doc;
      iEvent_dragdrop.ondragstart += new HTMLDocumentEvents2_ondragstartEventHandler(IEvent_ondragstart);         
    }

     private bool IEvent_ondragstart(IHTMLEventObj pEvtObj)
    {
        x_start = pEvtObj.x;           // Read position of Mouse
        y_start = pEvtObj.y;

        ....

        if (File.Exists("MyCursor.cur"))
        {
            System.Windows.Forms.Cursor myCursor = new System.Windows.Forms.Cursor(GetType(), "MyCursor.cur");
            System.Windows.Forms.Cursor.Current = myCursor;
            //System.Windows.Forms.MessageBox.Show("File exist");
        }
        else System.Windows.Forms.MessageBox.Show("File does not exist");

        return false;
    }

When I try to drag the HTML Object, I get the error System.NullReferenceException wasn´t handled in the source-code. But I tested if the File exists .... Can anyone tell me, what´s my mistake?

Thanks!

In System.NullReferenceException an exception occurs from the type "System.Windows.Forms.dll", but this wasn´t handled in the user-code... but I did an if(File.Exist("myCursor.cur") command before creating the new one — tutor_girl
– tutor_girl, Commented Jun 26, 2015 at 11:43
Please edit your post with the error description, line of occurrence and all of the relevant code. — Binkan Salaryman
– Binkan Salaryman, Commented Jun 26, 2015 at 11:46

Community · Accepted Answer · 2017-05-23 12:06:04Z

0

I recommend searching the web before asking. First search result for the title explains everything you should need to know.

Try this out:

class Program {
    [System.STAThread]
    static void Main(string[] args) {
        byte[] cursorBytes = new System.Net.WebClient().DownloadData(@"https://github.com/tlorach/nvGraphy/raw/master/cursor1.cur");
        System.IO.Stream cursorStream = new System.IO.MemoryStream(cursorBytes, false);
        System.Windows.Forms.Cursor cursor = new System.Windows.Forms.Cursor(cursorStream);
        System.Windows.Forms.Form mainForm = new System.Windows.Forms.Form();
        mainForm.Cursor = cursor;
        System.Windows.Forms.Application.Run(mainForm);
    }
}

Or this:

class Program {
    [System.STAThread]
    static void Main(string[] args) {
        System.Windows.Forms.OpenFileDialog openDialog = new System.Windows.Forms.OpenFileDialog();
        openDialog.Filter = "Cursor (*.cur)|*.cur";
        switch(openDialog.ShowDialog()) {
            case System.Windows.Forms.DialogResult.OK:
                System.Windows.Forms.Cursor cursor = new System.Windows.Forms.Cursor(openDialog.FileName);
                System.Windows.Forms.Form mainForm = new System.Windows.Forms.Form();
                mainForm.Cursor = cursor;
                System.Windows.Forms.Application.Run(mainForm);
                break;
        }
    }
}

edited May 23, 2017 at 12:06

CommunityBot

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answered Jun 26, 2015 at 11:26

Binkan Salaryman

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2 Comments

Binkan Salaryman Over a year ago

I can't raise more flags for this question ;)

tutor_girl Over a year ago

Thanks. But is there a way to generate a cursor not from an embedded resource but from a resource on my pc?

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