Capture click Anywhere

Question

Trying to capture a click anywhere on the screen and having problems when I use code snippet i found. getting the following error:

Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem in 'C:\Users\mholmes\Documents\Visual Studio 2015\Projects\Mouse Macro Tool\Mouse Macro Tool\bin\Debug\Mouse Macro Tool.vshost.exe'

snippet:

[DllImport("user32.dll")]
        static extern bool GetCursorPos(ref Point lpPoint);
        [DllImport("user32.dll", CallingConvention = CallingConvention.Cdecl)]
        public static extern int GetAsyncKeyState(long vKey);

 private void tmrMouseMove_Tick(object sender, EventArgs e)
        {
            try
            {
                Point pt = new Point();
                GetCursorPos(ref pt);

                lblMouseLocation.Text = pt.X.ToString() + " , " + pt.Y.ToString();

                if(GetAsyncKeyState(1) == 1)
                {
                    MessageBox.Show("Left click");
                }

                if(GetAsyncKeyState(2) ==1)
                {
                    MessageBox.Show("Right Click");
                }
            }
            catch(Exception ex)
            {

            }
        }

What am I doing wrong here? 

Answer 1

Ok I found a working method but its using a seperate task method and throwing a error. I dont know enough about multi threading to fix this issue:

error:

An exception of type 'System.ApplicationException' occurred in mscorlib.dll but was not handled in user code

Additional information: Object synchronization method was called from an unsynchronized block of code.

code:

private void StartWaitingForClickFromOutside()
        {
            try
            {
                if (checking.WaitOne(10))
                {
                    var ctx = new SynchronizationContext();
                    are.Reset();

                    Task.Factory.StartNew(() =>
                    {
                        while (true)
                        {
                            if (are.WaitOne(1))
                            {
                                break;
                            }
                            if (MouseButtons == MouseButtons.Left)
                            {
                                ctx.Send(CLickFromOutside, null);
                                //you might need to put in a delay here and not break depending on what you want to accomplish
                                break;
                            }
                        }

                        checking.ReleaseMutex();
                    });
                }
            }
            catch (Exception ex)
            {

            }
        }

Answer 2

GetAsyncKeyState declaration is wrong

[DllImport("User32.dll", SetLastError = true)]
        private static extern short GetAsyncKeyState(System.Windows.Forms.Keys vKey);

then

if ((GetAsyncKeyState(System.Windows.Forms.Keys.LButton) & unchecked((int)0x80000000)) != 0)                    
{
   // code for left click
}

etc...

Answer 3

Thank you so much works.