CODEWITHSUNDEEP
c#winformsmultithreading
YosiFZ
YosiFZ

Reputation: 7900

Cursor point in form

I want to get the cursor point in the form and not in the screen, i understand i need to use:

        Point ptCursor = Cursor.Position;
        ptCursor = PointToClient(ptCursor);

The issue is that i used this in a method that work on different thread, and it give me this error message:

Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.

why i get this error msg? can i used this lines in a method that run on thread? how can i call a method to run on form thread in couple of seconds?

Upvotes: 2

Views: 527

Answers (3)

Samich
Samich

Reputation: 30115

You need to access you UI level via Invoke method.

        Point ptCursor;

        this.Invoke(new Action(() => {
            ptCursor = Cursor.Position;
            ptCursor = PointToClient(ptCursor);
        }));

http://msdn.microsoft.com/en-us/library/zyzhdc6b.aspx

http://weblogs.asp.net/justin_rogers/pages/126345.aspx

Upvotes: 1

m0sa
m0sa

Reputation: 10940

You need to dispatch the PointToClient operation on the GUI thread:

this.Invoke(new Action(() => ptCursor = PointToClient(ptCursor)));

Upvotes: 2

Sebastian Piu
Sebastian Piu

Reputation: 8008

you need to get the form and call invoke().

like 

 Point ptCursor = Cursor.Position;
 Action action = () => ptCursor  = PointToClient(ptCursor);
 this.Invoke(action);

Upvotes: 0

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