Global Mouse Hook to find Windows Handles in C#

In Spy++ you initiate the selection by dragging cross-hairs from Spy++ and dropping it on the target window.  Since the drag starts from within your app you do not need a global hook.  As long as the mouse is held down you will continue to get MouseMove() events in your app.  To get the target window you simply pass the current cursor position to WindowFromPoint() and then pass that handle to GetWindowRect() to obtain the dimensions.

Thanks very much for the information, do you think this is going to be alot of work to do using a type of Global hook?
I am currently reading "Processing Global Mouse and Keyboard Hooks in C#" on code project but it does not seem like a trivial task.
When the user presses a button on another application i need to record the window name and the button name when the mouse button is clicked so i can repeat the process later.
I think i need to study the CodeProject example listed above unless you have anyother idea's of a simpler way to achieve this?

Thanks

I'll almost done with an example...standby.

Hi Idle_Mind
Thank you so much for taking the time to write the example, sorry if this is a stupid question but is there a property i need to set to make the picturebox dragable?

Thanks
Pete

I didn't put in any visual cue for the PictureBox being dragged.  A really simply approach is to set the crosshairs cursor in the MouseDown() event:

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                pictureBox1.Cursor = Cursors.Cross;
            }
        }

Then set it back to Cursors.Default in the MouseUp() event.

You can make it more sophisticated by using a custom cursor if you want.  It's even possible to build a dynamic custom cursor from the image in the picturebox.

Thanks for the help guys